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Xie F, Zhao B, Ji L, Antwi P, Li Y, Yue X. Exploring the potential of a novel alternating current stimulated iron‑carbon anammox process: A new horizon for nitrogen removal. Sci Total Environ 2024; 912:168893. [PMID: 38016562 DOI: 10.1016/j.scitotenv.2023.168893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 11/11/2023] [Accepted: 11/24/2023] [Indexed: 11/30/2023]
Abstract
This study explored a novel alternating current (AC) stimulation approach to enhance the nitrogen removal efficiency of an iron‑carbon based anammox (FeC anammox) system. In the preliminary experiment, the TN removal efficiency of the AC stimulated system was 8.06 % higher than that of a DC simulated system in same current densities of 0.25 mA/cm2. Gene expression analysis revealed that the AC-stimulated system, where, compared with the anammox system alone, the expression of HZS, HDH, NarG, NirS, NorB and NosZ increased by 1.81, 2.50, 1.64, 0.23, 1.15 and 1.27 times, respectively. In the continuous experiment, the TN removal rate increased from 60.13 % to 84.34 % after AC stimulation, and the working time of the FeC materials increased to 20 days. An analysis of the mechanism revealed that the parallel connection between the capacitive reactance and filler resistance in AC might reduce the internal resistance of the system, thereby improving the actual current density received by local microorganisms, and achieving a better strengthening effect.
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Affiliation(s)
- Fei Xie
- Taiyuan University of Science and Technology, School of Environment and Resources, Taiyuan 030024, PR China
| | - Bowei Zhao
- Taiyuan University of Technology, College of Environmental Science and Engineering, Taiyuan 030024, PR China
| | - Li Ji
- Taiyuan University of Science and Technology, School of Environment and Resources, Taiyuan 030024, PR China
| | - Philip Antwi
- Environment Protection Authority, Center for Applied Sciences, Water Science Unit, Macleod, Victoria 3085, Australia
| | - Yuan Li
- Taiyuan University of Science and Technology, School of Environment and Resources, Taiyuan 030024, PR China
| | - Xiuping Yue
- Taiyuan University of Technology, College of Environmental Science and Engineering, Taiyuan 030024, PR China.
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Mu Y, Luo W, Cui Z, Zhang M, Antwi P, Zhang D, Ren S. Synthesis of Fe 3O 4@Phoslock ® composites and the application in adsorption of phosphate from aqueous solution. Environ Sci Pollut Res Int 2022; 29:60674-60686. [PMID: 35426559 DOI: 10.1007/s11356-022-20163-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 04/05/2022] [Indexed: 06/14/2023]
Abstract
Assisted with an organosilane, Fe3O4@Phoslock® composites with different constituents were synthesized to separate phosphate from aqueous solution. The experimental adsorption data of kinetics and isothermal studies by the composites were well fitted by pseudo-second order and Freundlich models, respectively, suggesting the chemical and heterogeneous adsorption process, i.e., ligand exchange and precipitation. After loading of Fe3O4, Phoslock® became magnetic at the expense of the certain decrease of phosphate uptake from 10.4 to 8.1 mg P/g when [P]0 = 1.0 mmol/L and the solid/liquid ratio of 1.0 g/L were applied. However, compared with the original Fe3O4 nanoparticles, Fe3O4@Phoslock® showed more favorable phosphate uptake and stability against pH variation. The inhibitory influence of anionic ions on phosphate adsorption by three composites followed the order: HCO3- > humate > SiO32- > NO3- ≈ Cl- ≈ SO42-, while the facilitating effect of cations followed the order: Ca2+ > Mg2+ > NH4+. The regeneration rate was higher than 50% for all composites after recycled for 5 times by NaOH, and two of the composites successfully removed 75% phosphate from the landfill leachate treated by the Anammox process with the solid/liquid ratio of 5.0 g/L. This suggests that Fe3O4@Phoslock® composites would be a competitive adsorbent for phosphate removal from real wastewater.
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Affiliation(s)
- You Mu
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
- School of Resources of Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
| | - Wuhui Luo
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China.
- School of Resources of Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China.
- Ganzhou Technology Innovation Center for Mine Ecology Remediation, Ganzhou, 341000, People's Republic of China.
- Jiangxi Academy of Environmental Sciences, Nanchang, 330039, People's Republic of China.
| | - Zanpeng Cui
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
- School of Resources of Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
| | - Meng Zhang
- Jiangxi Academy of Environmental Sciences, Nanchang, 330039, People's Republic of China
| | - Philip Antwi
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
- School of Resources of Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
| | - Dachao Zhang
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
- School of Resources of Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
- Ganzhou Technology Innovation Center for Mine Ecology Remediation, Ganzhou, 341000, People's Republic of China
| | - Sili Ren
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
- School of Resources of Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
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Luo W, Huang Q, Zeng P, Cheng C, Yuan X, Xiao T, Zhang M, Antwi P, Xing J, Ren S. Gemini surfactant-modified montmorillonite with tetrachloroferrate (FeCl 4-) as a counterion simultaneously sequesters nitrate and phosphate from aqueous solution. J Hazard Mater 2021; 409:124829. [PMID: 33422752 DOI: 10.1016/j.jhazmat.2020.124829] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 11/27/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
Alkyl quaternary ammonium-modified clay minerals, which are common environmentally friendly materials, have been widely studied and applied for the removal of pollutants. However, there are few reports on functionalizing the counterions to expand the application. In this study, the cationic gemini surfactant butane-1,4-bis(dodecyl dimethyl ammonium bromide) (gBDDA) and tetrachloroferrate (FeCl4-) are designed to modify montmorillonite (Mt), and the obtained FeCl4-/Gemini-Mt composite (FeOMt) is used for the removal of nitrate and/or phosphate from aqueous solution. The successful intercalation of gBDDA and favorable loading of FeCl4- into FeOMt are suggested by the characterization results of X-ray diffraction and Raman spectroscopy. Nitrate and/or phosphate are rapidly sequestered, and the respective maximum uptakes of 8.77 (N) and 28.1 (P) mg/g in the binary system are obtained. The phosphate uptake is stably maintained against many coexisting ions, but the nitrate uptake decreases with the increase in ionic strength. FeOMt is reusable and shows comparable uptake for nitrate and phosphate with respect to gBDDA-modified Mt and polymerized ferric chloride. Considering the multi-functionality and facile synthesis, FeOMt shows promising potential in the purification of wastewater contaminated simultaneously by poorly hydrated anions (e.g., ClO4-, TcO4-, etc.) and iron-selective anions (e.g., H2AsO4-, etc.).
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Affiliation(s)
- Wuhui Luo
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China; Jiangxi Academy of Environmental Sciences, Nanchang 330039, PR China.
| | - Qidong Huang
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Ping Zeng
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Cheng Cheng
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Xiujuan Yuan
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Ting Xiao
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Meng Zhang
- Jiangxi Academy of Environmental Sciences, Nanchang 330039, PR China
| | - Philip Antwi
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Jialiang Xing
- Water and Environmental Engineering Group, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, UK
| | - Sili Ren
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
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Su H, Zhang D, Antwi P, Xiao L, Zhang Z, Deng X, Lai C, Zhao J, Deng Y, Liu Z, Shi M. Adaptation, restoration and collapse of anammox process to La(III) stress: Performance, microbial community, metabolic function and network analysis. Bioresour Technol 2021; 325:124731. [PMID: 33486412 DOI: 10.1016/j.biortech.2021.124731] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 01/09/2021] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
During the mining of rare earth mineral, the use of lanthanum-containing fertilizers, and the disposal of lanthanum-containing electronic products, the content of lanthanum (La(III)) in typical ammonia wastewater with low carbon to nitrogen ratio is increasing day by day. Here, effects of La(III) on anammox process in performance, microbial community structure, metabolic function, and microbial co-occurrence network were investigated. The results shown that the nitrogen removal efficiency was declines briefly and then gradually recovers after low dosage (1-5 mg/L) La(III) treatment and the decrease to low level (24.25 ± 1.74%) under high La(III) dosage (10 mg/L). La(III) in the range of 1-5 mg/L significantly promoted the relative abundance of Anammoxoglobus (0.024% to 9.762%). The blocking of key metabolic pathways was confirmed to cause the breakdown of anammox by PICRUSt. Furthermore, network analysis revealed that lack of cooperation bacteria limits the activity of Anammoxoglobus.
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Affiliation(s)
- Hao Su
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Dachao Zhang
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China.
| | - Philip Antwi
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Longwen Xiao
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Zhidan Zhang
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Xiaoyu Deng
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Cheng Lai
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Jiejun Zhao
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Yukun Deng
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Zuwen Liu
- Jiangxi University of Science and Technology, School of Resources Environmental Engineering, Jiangxi Province, Ganzhou City 341000, China
| | - Miao Shi
- Ganzhou Eco-Environmental Engineering Investment Company Limited, Jiangxi Province, Ganzhou City 341000, China
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Quashie FK, Feng K, Fang A, Agorinya S, Antwi P, Kabutey FT, Xing D. Efficiency and key functional genera responsible for simultaneous methanation and bioelectricity generation within a continuous stirred microbial electrolysis cell (CSMEC) treating food waste. Sci Total Environ 2021; 757:143746. [PMID: 33229085 DOI: 10.1016/j.scitotenv.2020.143746] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 10/30/2020] [Accepted: 10/31/2020] [Indexed: 06/11/2023]
Abstract
This study reveals the efficient treatment of high strength food waste under varying hydraulic retention times (48 h, 36 h and 24 h) in a continuous stirred tank reactor (CSTR) integrated with microbial electrolysis cell (MEC) to become a continuous stirred microbial electrolysis cell (CSMEC). COD removal efficiency in the CSMEC surpassed 92% with OLR ranging from 0.4 to 21.31 kg COD/m3·d compared to that of the CSTR. The maximum current density (based on the cathode surface area) was 1125.35 ± 81 mA/m2 in the CSMEC. Biogas yield and methane production rates increased by 16.5% and 19.3% in the CSMEC respectively compared to the CSTR. CSMEC was 1.52 times better in performance compared to the CSTR. Firmicutes, Synergistetes, Bacteroidetes, Thermotogae, Chloroflexi and Proteobacteria were the dominant phyla associated with both CSMEC and CSTR. Archaeal microbial community analysis showed Methanosaeta, Methanobacterium, Methanosarcina and Methanocorpusculum as the dominant populations associated with the CSMEC.
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Affiliation(s)
- Frank Koblah Quashie
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China; Nuclear Application Centre (NAC), National Nuclear Research Institute (NNRI), Ghana Atomic Energy Commission (GAEC), P.O. Box LG 80, Legon, Ghana
| | - Kun Feng
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Anran Fang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Sarah Agorinya
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Philip Antwi
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
| | - Felix Tetteh Kabutey
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Defeng Xing
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
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Su H, Zhang D, Antwi P, Xiao L, Deng X, Liu Z, Long B, Shi M, Manefield MJ, Ngo HH. Exploring potential impact(s) of cerium in mining wastewater on the performance of partial-nitrification process and nitrogen conversion microflora. Ecotoxicol Environ Saf 2021; 209:111796. [PMID: 33341697 DOI: 10.1016/j.ecoenv.2020.111796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 12/06/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
Cerium Ce(III) is one of the major pollutants contained in wastewater generated during Ce(III) mining. However, the effect(s) of Ce(III) on the functional genera responsible for removing nitrogen biologically from wastewater has not been studied and reported. In this study, the effects of Ce(III) on aspects of partial-nitritation-(PN) process including ammonia oxidation rate (AOR), process kinetics, and microbial activities were investigated. It was found that the effect of dosing Ce(III) in the PN system correlated strongly with the AOR. Compared to the control, batch assays dosed with 5 mg/L Ce(III) showed elevated PN efficiency of about 121%, an indication that maximum biological response was feasible upon Ce(III) dose. It was also found that, PN performance was not adversely affected, given that Ce(III) dose was ≤20 mg/L. Process kinetics investigated also suggested that the maximum Ce(III) dose without any visible inhibition to the activities of ammonium oxidizing bacteria was 1.37 mg/L, but demonstrated otherwise when Ce(III) dose exceeded 5.63 mg/L. Compared to the control, microbes conducted efficient Ce(III) removal (averaged 98.66%) via biosorption using extracellular polymeric substances (EPS). Notably, significant deposits of Ce(III) was found within the EPS produced as revealed by SEM, EDX, CLSM and FTIR. 2-dimensional correlation infrared-(2DCOS-IR) revealed ester group (uronic acid) as a major organic functional group that promoted Ce(III) removal. Excitation-emission matrix-(EEM) spectrum and 2DCOS-IR suggested the dominance of Fulvic acid, hypothesized to have promoted the performance of the PN process under Ce(III) dosage.
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Affiliation(s)
- Hao Su
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Ganzhou 341000, Jiangxi, PR China
| | - Dachao Zhang
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Ganzhou 341000, Jiangxi, PR China.
| | - Philip Antwi
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Ganzhou 341000, Jiangxi, PR China; University of Southern Queensland, School of Civil and Electrical Engineering, Darling Heights, Toowoomba, QLD 4350, Australia.
| | - Longwen Xiao
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Ganzhou 341000, Jiangxi, PR China
| | - Xiaoyu Deng
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Ganzhou 341000, Jiangxi, PR China
| | - Zuwen Liu
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Ganzhou 341000, Jiangxi, PR China
| | - Bei Long
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Ganzhou 341000, Jiangxi, PR China
| | - Miao Shi
- Ganzhou Eco-Environmental Engineering Investment Company Limited, Ganzhou 341000, Jiangxi, China
| | - Michael J Manefield
- University of New South Wales, School of Civil and Environmental Engineering, Water Research Centre, Sydney, NSW 2052, Australia
| | - Huu Hao Ngo
- University of Technology Sydney, Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, Sydney, NSW 2007, Australia
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Kabutey FT, Ding J, Zhao Q, Antwi P, Quashie FK. Electrical current generation from a continuous flow macrophyte biocathode sediment microbial fuel cell (mSMFC) during the degradation of pollutants in urban river sediment. Environ Sci Pollut Res Int 2020; 27:35364-35380. [PMID: 32594445 DOI: 10.1007/s11356-020-09812-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 06/18/2020] [Indexed: 06/11/2023]
Abstract
A new type of sediment microbial fuel cell (SMFC) with floating macrophyte Limnobium laevigatum, Pistia stratiotes, or Lemna minor L. biocathode was constructed and assessed in three phases at different hydraulic retention time (HRT) for electrical current generation during the degradation of urban river sediment. The results showed a highest voltage output of 0.88 ± 0.1 V, maximum power density of 80.22 mW m-3, highest columbic efficiency of 15.3%, normalized energy recovery of 0.030 kWh m-3, and normalized energy production of 0.005 kWh m-3 in the Lemna minor L. SMFC during phase 3 at HRT of 48 h, respectively. Highest removal efficiencies of total chemical oxygen demand of 80%, nitrite of 99%, ammonia of 93%, and phosphorus of 94% were achieved in Lemna minor L. system, and 99% of nitrate removal and 99% of sulfate removal were achieved in Pistia stratiotes and Limnobium laevigatum system during the SMFC operation, respectively. Pistia stratiotes exhibited the highest growth in terms of biomass and tap root system of 29.35 g and 12.2 cm to produce the maximum dissolved oxygen of 16.85 ± 0.2 mg L-1 compared with other macrophytes. The predominant bacterial phylum Proteobacteria of 62.86% and genus Exiguobacterium of 17.48% were identified in Limnobium laevigatum system, while the class Gammaproteobacteria of 28.77% was observed in the control SMFC. The integration of technologies with the continuous flow operation shows promising prospect in the remediation of polluted urban river sediments along with the generation of electrical current.
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Affiliation(s)
- Felix Tetteh Kabutey
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China
- Council for Scientific and Industrial Research-Institute for Scientific and Technological Information (CSIR-INSTI), P. O. Box M-32, Accra, Ghana
| | - Jing Ding
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China
| | - Qingliang Zhao
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China.
| | - Philip Antwi
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
| | - Frank Koblah Quashie
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China
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Su H, Zhang D, Antwi P, Xiao L, Liu Z, Deng X, Asumadu-Sakyi AB, Li J. Effects of heavy rare earth element (yttrium) on partial-nitritation process, bacterial activity and structure of responsible microbial communities. Sci Total Environ 2020; 705:135797. [PMID: 31806320 DOI: 10.1016/j.scitotenv.2019.135797] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 11/24/2019] [Accepted: 11/25/2019] [Indexed: 06/10/2023]
Abstract
Yttrium (Y(III)) is mined commercially for industrial purposes due to its excellent physical properties. However, the effects of Y(III) in mining-wastewater on the performance of partial-nitritation process and ammonia-oxidizing bacteria (AOB) have not been explored. To elucidate Y(III) effects on biological mechanisms, kinetics was conducted to establish a correlation between Y(III) dosage and specific-oxygen-uptake-rate (SOUR). The mechanism(s) demonstrated by bacterial population to resist against toxic effects from Y(III) dose was also investigated using scanning electron microscopy-(SEM), energy-dispersive X-ray spectroscopy-(EDS), confocal laser scanning microscopy-(CLSM),Fourier transform infrared-(FTIR) spectroscopy, and 2-dimensional correlation infrared-(2DCOS-IR) approach. The study revealed a strong correlation between ammonium oxidation rate (AOR) and Y(III) dosage. AOR promotion was more pronounced when Y(III) concentration was ≤20 mg/L (maximum AOR of 12.39 mgN/L/h, at 5 mg/L), whereas inhibition when Y(III) in influent was >20 mg/L (minimum AOR of 7.34 mgN/L/h, at 500 mg/L). Aiba model demonstrated high-performance (R2 = 0.962) when Y(III) concentration ranged 0-20 mg/L, whereas linear model fitted well (R2 of 0.984) to experimental data when Y(III) dose ranged 20-500 mg/L. The maximum change in SOUR (Vmax), half-rate constant (Km), and inhibition constant (Ki) reached 1.04 d-1, 20.12 mg/L, and 4.87 mg/L, respectively, an indication that dosage of Y(III) could affect the partial-nitritation process. SEM-EDS showed that the content of extracellular polymeric substances (EPS) increased along with increasing Y(III) dosage. When 20 mg/L of Y(III) was dosed, the fraction of Y(III) within the surface elemental composition of the sludge increased gradually whereas that of calcium decreased. To further comprehend the EPS production, CLSM results further revealed β-polysaccharide as the dominant component in the EPS. FTIR/2DCOD-IR showed that the chelation of polyguluronic sections within β-polysaccharide, together with hydrazine might be the main pathways of cell resistance, but β- glucan, may have caused the hormesis.
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Affiliation(s)
- Hao Su
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China
| | - Dachao Zhang
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China.
| | - Philip Antwi
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China.
| | - Longwen Xiao
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China
| | - Zuwen Liu
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China
| | - Xiaoyu Deng
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China
| | - Akwasi Bonsu Asumadu-Sakyi
- Queensland University of Technology, School of Chemistry, Physics and Mechanical Engineering, 2 George St., Brisbane City, QLD 4000, Australia
| | - Jianzheng Li
- Harbin Institute of Technology, State Key Laboratory of Urban Water Resource and Environment, School of Environmental, 73 Huanghe Road, Harbin 150090, PR China
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Luo W, Huang Q, Antwi P, Guo B, Sasaki K. Synergistic effect of ClO4− and Sr2+ adsorption on alginate-encapsulated organo-montmorillonite beads: Implication for radionuclide immobilization. J Colloid Interface Sci 2020; 560:338-348. [DOI: 10.1016/j.jcis.2019.10.049] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 10/07/2019] [Accepted: 10/12/2019] [Indexed: 11/25/2022]
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Deng X, Zhang D, Wu M, Antwi P, Su H, Lai C. Enhanced removal of refractory pollutant from aniline aerofloat wastewater using combined vacuum ultraviolet and ozone (VUV/O 3) process. Water Sci Technol 2019; 80:2250-2259. [PMID: 32245917 DOI: 10.2166/wst.2020.048] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Aerofloats, such as aniline aerofloat ((C6H5NH)2PSSH), are extensively employed for collection activities in wastewater particularly in cases where minerals are in flotation. Although this aniline aerofloat has efficient collection properties, they are ordinarily biologically persistent chemicals in which case their residual, as well as their byproducts, pose great environmental risks to water and soils. In this study, the removal efficiency of aniline aerofloat (AAF) by a combined vacuum ultraviolet (VUV) and ozone (O3) process (VUV/O3) was evaluated. Furthermore, the impacts of pH, O3, the concentration of AAF and coexisting ions (SiO3 2-, CO3 2-, Cl- (Na+), SO4 2-, Ca2+) were systematically studied. The experiments revealed that, with an initial AAF of 15 mg/L, AAF removal >88% was feasible with a reaction time of 60 min, pH of 8 and O3 of 6 g/h. The order of influence of the selected coexisting ions on the degradation of AAF by VUV/O3 was Ca2+ > CO3 2- > SiO3 2- > Cl- (Na+) >SO4 2-. Compared with VUV and O3 in terms of pollutant degradation rate, VUV/O3 showed a remarkable performance, followed by O3 and VUV. Additionally, the degradation kinetics of AAF by the VUV/O3 process agreed well with first-order elimination kinetics.
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Zhang D, Su H, Antwi P, Xiao L, Liu Z, Li J. High-rate partial-nitritation and efficient nitrifying bacteria enrichment/out-selection via pH-DO controls: Efficiency, kinetics, and microbial community dynamics. Sci Total Environ 2019; 692:741-755. [PMID: 31539982 DOI: 10.1016/j.scitotenv.2019.07.308] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 07/09/2019] [Accepted: 07/19/2019] [Indexed: 06/10/2023]
Abstract
Conventional nitrification/denitrification process is gradually being replaced with partial-nitritation/anammox (PN/A) processes due to its installation and running cost. However, high ammonia-oxidizing bacteria (AOB) and anaerobic ammonia-oxidizing (anammox) bacteria activity as well as optimum out-selection of nitrite-oxidizing bacteria (NOB) are necessary to achieving efficient PN/A process. Consequently, to enhance PN process via nitrifying bacteria enrichment/out-selection within psychrophilic environment, a novel pH-DO (dissolved oxygen) control strategy was proposed and the response of PN, kinetics, AOB enrichment, and NOB out-selection efficiency was investigated during start-up and long-term operation. With DO of 0.7 mg/L and pH of 7.5-7.9, quick start-up of the PN process was established within 34d as NO2--N accumulation ratio (NAR) reached 90.08 ± 1.4%. Again, when NLR was elevated to 0.8 kg/m3·d (400mgNH4+-N/L), DO curtailed to 0.2 mg/L, pH maintained at 7.7 and free ammonium at 6.5 mg/L, NAR and NH4+-N removal rate could still reach 97.04 ± 2.4% and 97.84 ± 1.5%, respectively. After optimum control factors had been established, real nitrogen-rich-mine-wastewater was fed (DO, 0.2 mg/L, pH, 8.9, and free ammonia, 6.5 mg/L) and NAR and NH4+-N removal rate reached was 97.33 ± 0.5% and 97.76 ± 1.1%, respectively. Estimated kinetic parameters including maximum degradation rate (Vmax = 1.58/d), half-rate constant (Km = 33.8 mg/L), and inhibition constant (Ki = 201.6 mg/L) suggested that inhibition on NH4+-N oxidation was most feasible at higher concentration of NH4+-N. To elucidate biological mechanisms, 16S rRNA high-throughput revealed that AOB (Nitrosomonas) enrichment had increased from 0.08% to 49% whereas NOB (Nitrospira) abundance reduced from 1% to 0.034%, indicating pH-DO control efficiently enriched AOB and out-selected NOB. Conversely, when influent NH4+-N was curtailed to about 200 mg/L and free ammonia concentration maintained at 6.5 mg/L, the population of AOB was observably reduced by 6% within a period of 14 days, indicating control strategies including pH-DO control and substrate availability were the key factors which substantially influenced and promoted the activities and growth of AOBs in the present SBR.
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Affiliation(s)
- Dachao Zhang
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi province, Ganzhou city 341000, PR China
| | - Hao Su
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi province, Ganzhou city 341000, PR China
| | - Philip Antwi
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi province, Ganzhou city 341000, PR China.
| | - Longwen Xiao
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi province, Ganzhou city 341000, PR China
| | - Zuwen Liu
- Jiangxi University of Science and Technology, School of Resources & Environmental Engineering, Jiangxi province, Ganzhou city 341000, PR China
| | - Jianzheng Li
- Harbin Institute of Technology, State Key Laboratory of Urban Water Resource and Environment, School of Environmental, 73 Huanghe Road, Harbin 150090, PR China
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12
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Antwi P, Zhang D, Xiao L, Kabutey FT, Quashie FK, Luo W, Meng J, Li J. Modeling the performance of Single-stage Nitrogen removal using Anammox and Partial nitritation (SNAP) process with backpropagation neural network and response surface methodology. Sci Total Environ 2019; 690:108-120. [PMID: 31284185 DOI: 10.1016/j.scitotenv.2019.06.530] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Revised: 06/29/2019] [Accepted: 06/30/2019] [Indexed: 06/09/2023]
Abstract
Two novel feedforward backpropagation Artificial Neural Networks (ANN)-based-models (8:NH:1 and 7:NH:1) combined with Box-Behnken design of experiments methodology was proposed and developed to model NH4+ and Total Nitrogen (TN) removal within an upflow-sludge-bed (USB) reactor treating nitrogen-rich wastewater via Single-stage Nitrogen removal using Anammox and Partial nitritation (SNAP) process. ANN were developed by optimizing network architecture parameters via response surface methodology. Based on the goodness-of-fit standards, the proposed three-layered NH4+ and TN removal ANN-based-models trained with Levenberg-Marquardt-algorithm demonstrated high-performance as computations exhibited smaller deviations-(±2.1%) as well as satisfactory coefficient of determination (R2), fractional variance-(FV), and index of agreement-(IA) ranging 0.989-0.997, 0.003-0.031 and 0.993-0.998, respectively. The computational results affirmed that the ANN architecture which was optimized with response surface methodology enhanced the efficiency of the ANN-based-models. Furthermore, the overall performance of the developed ANN-based models revealed that modeling intricate biological systems (such as SNAP) using ANN-based models with the view to improve removal efficiencies, establish process control strategies and optimize performance is highly feasible. Microbial community analysis conducted with 16S rRNA high-throughput approach revealed that Candidatus Kuenenia was the most pronounced genera which accounted for 13.11% followed by Nitrosomonas-(6.23%) and Proteocatella-(3.1%), an indication that nitrogen removal pathway within the USB was mainly via partial-nitritation/anammox process.
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Affiliation(s)
- Philip Antwi
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi Province, Ganzhou City 341000, China.
| | - Dachao Zhang
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi Province, Ganzhou City 341000, China.
| | - Longwen Xiao
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi Province, Ganzhou City 341000, China.
| | - Felix Tetteh Kabutey
- Harbin Institute of Technology, School of Environmental, State Key Laboratory of Urban Water Resource and Environment, 73 Huanghe Road, Harbin 150090, China
| | - Frank Koblah Quashie
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi Province, Ganzhou City 341000, China
| | - Wuhui Luo
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, Jiangxi Province, Ganzhou City 341000, China
| | - Jia Meng
- Harbin Institute of Technology, School of Environmental, State Key Laboratory of Urban Water Resource and Environment, 73 Huanghe Road, Harbin 150090, China; University of Queensland, Advanced Water Management Centre, Gehrman Building, Research Road, The St Lucia, Brisbane, QLD 4072, Australia
| | - Jianzheng Li
- Harbin Institute of Technology, School of Environmental, State Key Laboratory of Urban Water Resource and Environment, 73 Huanghe Road, Harbin 150090, China
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Kabutey FT, Antwi P, Ding J, Zhao QL, Quashie FK. Enhanced bioremediation of heavy metals and bioelectricity generation in a macrophyte-integrated cathode sediment microbial fuel cell (mSMFC). Environ Sci Pollut Res Int 2019; 26:26829-26843. [PMID: 31300989 DOI: 10.1007/s11356-019-05874-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 06/28/2019] [Indexed: 06/10/2023]
Abstract
Sediment microbial fuel cell (SMFC) and constructed wetlands with macrophytes have been independently employed for the removal of heavy metals from polluted aquatic ecosystems. Nonetheless, the coupling of macrophytes at the cathode of SMFCs for efficient and synchronous heavy metal removal and bioelectricity generation from polluted river sediment has not been fully explored. Therefore, a novel macrophyte biocathode SMFC (mSMFC) was proposed, developed, and evaluated for heavy metals/organics removal as well as bioelectricity generation in an urban polluted river. With macrophyte-integrated cathode, higher heavy metal removals of Pb 99.58%, Cd 98.46%, Hg 95.78%, Cr 92.60%, As 89.18%, and Zn 82.28% from the sediments were exhibited after 120 days' operation. Total chemical oxygen demand, total suspended solids, and loss on ignition reached 73.27%, 44.42 ± 4.4%, and 5.87 ± 0.4%, respectively. A maximum voltage output of 0.353 V, power density of 74.16 mW/m3, columbic efficiency of 19.1%, normalized energy recovery of 0.028 kWh/m3, and net energy production of 0.015 kWh/m3 were observed in the Lemna minor L. SMFC. Heavy metal and organic removal pathways included electrochemical reduction, precipitation and recovery, bioaccumulation by macrophyte from the surface water, and bioelectrochemical reduction in the sediment. This study established that mSMFC proved as an efficient system for the remediation of heavy metals Pb, Cd, Hg, Cr, As, and Zn, and TCOD in polluted rivers along with bioelectricity generation.
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Affiliation(s)
- Felix Tetteh Kabutey
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China
- Council for Scientific and Industrial Research-Institute for Scientific and Technological Information (CSIR-INSTI), P. O. Box, M-32, Accra, Ghana
| | - Philip Antwi
- Jiangxi Key Laboratory of Mining and Metallurgy Environmental Pollution Control, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, People's Republic of China
| | - Jing Ding
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China
| | - Qing-Liang Zhao
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China.
| | - Frank Koblah Quashie
- State Key Laboratory of Urban Water Resources and Environments (SKLURE), Harbin Institute of Technology, Harbin, 150090, China
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14
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Luo W, Ouyang J, Antwi P, Wu M, Huang Z, Qin W. Corrigendum to "Microwave/ultrasound-assisted modification of montmorillonite by conventional and gemini alkyl quaternary ammonium salts for adsorption of chromate and phenol: Structure-function relationship" [Sci. Total Environ. 655 (2019) 1104-1112]. Sci Total Environ 2019; 674:26. [PMID: 31003084 DOI: 10.1016/j.scitotenv.2019.04.159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Affiliation(s)
- Wuhui Luo
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China; Jiangxi Academy of Environmental Sciences, Nanchang 330077, PR China
| | - Jiping Ouyang
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China; School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510000, PR China
| | - Philip Antwi
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Meng Wu
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Zhiqiang Huang
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
| | - Weiwei Qin
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610000, PR China; Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, USA.
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15
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Antwi P, Zhang D, Luo W, Xiao LW, Meng J, Kabutey FT, Ayivi F, Li J. Performance, microbial community evolution and neural network modeling of single-stage nitrogen removal by partial-nitritation/anammox process. Bioresour Technol 2019; 284:359-372. [PMID: 30954904 DOI: 10.1016/j.biortech.2019.03.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 03/01/2019] [Accepted: 03/04/2019] [Indexed: 06/09/2023]
Abstract
Single-stage nitrogen removal by anammox/partial-nitritation (SNAP) process was proposed and explored in a packed-bed-EGSB reactor to treat nitrogen-rich wastewater. With dissolved oxygen (DO) maintained within 0.2-0.5 mg/L, reactor performance and microbial community dynamics were evaluated and reported. To ascertain whether control/prediction of the SNAP process was feasible with mathematical modeling, a novel 3-layered backpropagation-artificial-neural-network-(BANN) was also developed to model nitrogen removal efficiencies. When NLR of 300 gN/m3·d and DO of <0.3 mg/L was employed, the SNAP-process demonstrated autotrophic nitrogen removal pathways with NH4+-N and TN removal of 91.1% and 81.9%, respectively. Microbial community succession revealed by 16S rRNA high-throughput gene-sequencing indicated that Candidatus-Kuenenia-(33.83%), Nitrosomonas-(3.4%) Armatimonadetes_gp5-(1.39%), Ignavibacterium-(1.80%), Thiobacillus-(1.33%), and Nitrospira-(1.17%) were the most pronounced genera at steady-state. The proposed BANN-model demonstrated high-performance as computational results revealed smaller deviations (±3%) and satisfactory coefficient of determination-(R2 = 0.989), fractional variance-(FV = 0.0107), and index of agreement-(IA = 0.997). Thus, forecasting the efficiency of a SNAP-process with neural-network modeling was highly feasible.
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Affiliation(s)
- Philip Antwi
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China
| | - Dachao Zhang
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China.
| | - Wuhui Luo
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China
| | - Long Wen Xiao
- Jiangxi University of Science and Technology, School of Resources and Environmental Engineering, Jiangxi Province, Ganzhou City 341000, PR China
| | - Jia Meng
- Harbin Institute of Technology, School of Environmental, 73 Huanghe Road, Harbin 150090, PR China
| | - Felix Tetteh Kabutey
- Harbin Institute of Technology, School of Environmental, 73 Huanghe Road, Harbin 150090, PR China
| | - Frederick Ayivi
- Fayetteville State University, Department of Geography, 1200 Murchison Road, Fayetteville, NC 28301, USA
| | - Jianzheng Li
- Harbin Institute of Technology, School of Environmental, 73 Huanghe Road, Harbin 150090, PR China
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16
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Luo W, Ouyang J, Antwi P, Wu M, Huang Z, Qin W. Microwave/ultrasound-assisted modification of montmorillonite by conventional and gemini alkyl quaternary ammonium salts for adsorption of chromate and phenol: Structure-function relationship. Sci Total Environ 2019; 655:1104-1112. [PMID: 30577104 DOI: 10.1016/j.scitotenv.2018.11.329] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 11/07/2018] [Accepted: 11/21/2018] [Indexed: 05/13/2023]
Abstract
Butane-1,4-bis(dodecyl dimethyl ammonium bromide) (gBDDA) and dodecyl trimethyl ammonium bromide (DTMA) in same stoichiometric amounts were applied to modify montmorillonite (Mt) under microwave and ultrasound conditions. The composition and structure of products were obtained through multiple characterizations including XRD, FTIR, TG/DTG, SEM, TEM, and N2 adsorption/desorption measurements, and the adsorption performance of chromate and phenol on these products were also investigated. Intercalations of gBDDA and DTMA into interlayer space of Mt were observed, but the amount of anchored modifier on the external surface was larger for gBDDA compared with DTMA when the stoichiometric amount of modifier larger than 1.0 times cation exchange capacity of Mt was added. Although there was no significant difference in morphology among products, the interlayer space distance, specific surface area, and pore size distribution were closely associated with the species and amount of applied modifier. Adsorption of phenol on products through partition mechanism relied on not only organic content, but also the configuration of modifier. Meanwhile, adsorption of chromate mainly depended on the presence of counter ion (bromide), which accounted for the high adsorption capacity and initial adsorption rate on gOMt-0.75. The fitting parameters of adsorption results using pseudo-second order model and Freundlich model suggested that gBDDA-modified Mt could sequester phenol or chromate in the faster manner with higher affinity. Compared with the conventional surfactant such as DTMA, the study revealed that, using gemini surfactant such as gBDDA to modify Mt would significantly reduce or even has the potential to eradicate the secondary pollution by modifier release during adsorption process. This study provides a new direction for Mt modification intended to be used as adsorbents to treat polluted water with high standards such as drinking water.
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Affiliation(s)
- Wuhui Luo
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China; Jiangxi Academy of Environmental Sciences, Nanchang 330077, PR China
| | - Jiping Ouyang
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China; School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510000, PR China
| | - Philip Antwi
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Meng Wu
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China
| | - Zhiqiang Huang
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
| | - Weiwei Qin
- Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 610000, PR China; Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, USA.
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Meng J, Li J, Li J, Nan J, Deng K, Antwi P. Effect of temperature on nitrogen removal and biological mechanism in an up-flow microaerobic sludge reactor treating wastewater rich in ammonium and lack in carbon source. Chemosphere 2019; 216:186-194. [PMID: 30368083 DOI: 10.1016/j.chemosphere.2018.10.132] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 09/25/2018] [Accepted: 10/17/2018] [Indexed: 06/08/2023]
Abstract
Previous study has demonstrated that microaerobic process is effective in nitrogen removal from the wastewater with high ammonium and low carbon to nitrogen ratio. In the microaerobic system, synergistic action of anammox, ammonia oxidizing bacteria (AOB), nitrite oxidizing bacteria (NOB) and denitrifiers was the key issues to remove nitrogen from the wastewater rich in ammonium. Temperature has a significant effect on specific growth rate and activity of various nitrogen removal functional bacteria. In this study, the effect of temperature (35 °C-15 °C) on nitrogen removal were investigated in an up-flow microaerobic sludge reactor (UMSR) at the HRT of 8 h and reflux ratio of 45. Above 71.2% of total nitrogen (TN) and 80.7% of NH4+ removal efficiencies were observed at the temperature no less than 17 °C. With the temperature further decreasing to 15 °C, denitrifiers still dominant the UMSR, but AOB, NOB and Candidatus Brocadia as the predominant anammox bacteria were inhibited revealed by high throughput sequencing, resulting in the decrease of TN and NH4+ removal to 39.7% and 61.8%, respectively. Fortunately, when the temperature rebounded to 20 °C, a higher TN and NH4+ removal of 81.2% and 97.3% were obtained again in the UMSR.
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Affiliation(s)
- Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China; Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
| | - Jiuling Li
- Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia.
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Jun Nan
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Kaiwen Deng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Philip Antwi
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
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Zhang D, Xu S, Antwi P, Xiao L, Luo W, Liu Z, Li J, Su H, Lai C, Ayivi F. Accelerated start-up, long-term performance and microbial community shifts within a novel upflow porous-plated anaerobic reactor treating nitrogen-rich wastewater via ANAMMOX process. RSC Adv 2019; 9:26263-26275. [PMID: 35530984 PMCID: PMC9070342 DOI: 10.1039/c9ra04225c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 08/12/2019] [Indexed: 11/21/2022] Open
Abstract
Schematic diagram of the upflow porous-plate anaerobic reactor and nitrogen removal pathways occurring within the reactor.
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Antwi P, Emikpe B, Essel K, Folitse R, Jarikre T. Detection of Toxoplasma gondii in goats at the Kumasi abattoir, Ghana. Int J Infect Dis 2018. [DOI: 10.1016/j.ijid.2018.04.4110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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20
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Meng J, Li J, Li J, Astals S, Nan J, Deng K, Antwi P, Xu P. The role of COD/N ratio on the start-up performance and microbial mechanism of an upflow microaerobic reactor treating piggery wastewater. J Environ Manage 2018; 217:825-831. [PMID: 29660708 DOI: 10.1016/j.jenvman.2018.04.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 03/22/2018] [Accepted: 04/06/2018] [Indexed: 06/08/2023]
Abstract
This study investigated the role of COD/N ratio on the start-up and performance of an upflow microaerobic sludge reactor (UMSR) treating piggery wastewater at 0.5 mgO2/L. At high COD/N ratio (6.24 and 4.52), results showed that the competition for oxygen between ammonia-oxidizing bacteria, nitrite-oxidizing bacteria and heterotrophic bacteria limited the removal of nitrogen. Nitrogen removal efficiency was below 40% in both scenarios. Decreasing the influent COD/N ratio to 0.88 allowed achieving high removal efficiencies for COD (∼75%) and nitrogen (∼85%) due to the lower oxygen consumption for COD mineralization. Molecular biology techniques showed that nitrogen conversion at a COD/N ratio 0.88 was dominated by the anammox pathway and that Candidatus Brocadia sp. was the most important anammox bacteria in the reactor with a relative abundance of 58.5% among the anammox bacteria. Molecular techniques also showed that Nitrosomonas spp. was the major ammonia-oxidiser bacteria (relative abundance of 86.3%) and that denitrification via NO3- and NO2- also contributed to remove nitrogen from the system.
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Affiliation(s)
- Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, PR China; Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia
| | - Jiuling Li
- Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, PR China.
| | - Sergi Astals
- Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD, 4072, Australia
| | - Jun Nan
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, PR China
| | - Kaiwen Deng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, PR China
| | - Philip Antwi
- School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, PR China
| | - Pianpian Xu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, PR China
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Antwi P, Li J, Meng J, Deng K, Koblah Quashie F, Li J, Opoku Boadi P. Feedforward neural network model estimating pollutant removal process within mesophilic upflow anaerobic sludge blanket bioreactor treating industrial starch processing wastewater. Bioresour Technol 2018; 257:102-112. [PMID: 29486407 DOI: 10.1016/j.biortech.2018.02.071] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 02/10/2018] [Accepted: 02/14/2018] [Indexed: 06/08/2023]
Abstract
In this a, three-layered feedforward-backpropagation artificial neural network (BPANN) model was developed and employed to evaluate COD removal an upflow anaerobic sludge blanket (UASB) reactor treating industrial starch processing wastewater. At the end of UASB operation, microbial community characterization revealed satisfactory composition of microbes whereas morphology depicted rod-shaped archaea. pH, COD, NH4+, VFA, OLR and biogas yield were selected by principal component analysis and used as input variables. Whilst tangent sigmoid function (tansig) and linear function (purelin) were assigned as activation functions at the hidden-layer and output-layer, respectively, optimum BPANN architecture was achieved with Levenberg-Marquardt algorithm (trainlm) after eleven training algorithms had been tested. Based on performance indicators such the mean squared errors, fractional variance, index of agreement and coefficient of determination (R2), the BPANN model demonstrated significant performance with R2 reaching 87%. The study revealed that, control and optimization of an anaerobic digestion process with BPANN model was feasible.
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Affiliation(s)
- Philip Antwi
- Jiangxi Key Laboratory of Mining & Metallurgy Environmental Pollution Control, School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China; Department for Management of Science and Technology Development, Faculty of Environment and Labour Safety, Ton Duc Thang University, Ho Chi Minh City, Viet Nam; State Key Laboratory of Urban Water Resource and Environment, School of Environmental, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environmental, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, School of Environmental, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Kaiwen Deng
- State Key Laboratory of Urban Water Resource and Environment, School of Environmental, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Frank Koblah Quashie
- State Key Laboratory of Urban Water Resource and Environment, School of Environmental, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jiuling Li
- Advanced Water Management Centre, Gehrmann Building, Research Road, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
| | - Portia Opoku Boadi
- School of Management, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin 150001, PR China
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Chi X, Li J, Wang X, Zhang Y, Antwi P. Hyper-production of butyric acid from delignified rice straw by a novel consolidated bioprocess. Bioresour Technol 2018; 254:115-120. [PMID: 29413911 DOI: 10.1016/j.biortech.2018.01.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 01/07/2018] [Accepted: 01/08/2018] [Indexed: 06/08/2023]
Abstract
A novel consolidated bioprocess for hyper-production of butyric acid from delignified rice straw without exogenous enzymes involved was developed by co-fermentation of Clostridium thermocellum ATCC 27405 and C. thermobutyricum ATCC 49875. Feasibility of the consolidated bioprocess was approved by batch fermentations, with the optimum pH of 6.5. Fed-batch fermentation with a constant pH of 6.5 at 55 °C could enhance the butyric acid yield to a remarkable 33.9 g/L with a selectivity as high as 78%. Metabolic analysis of the co-culture indicated that sugars liberated by C. thermocellum ATCC 27405 were effectively converted to butyric acid by C. thermobutyricum ATCC 49875. Secondary metabolism of C. thermobutyricum ATCC 49875 also contributed to the hyper-production of butyric acid, resulting in the re-assimilation of by-products such as acetic acid and ethanol. This work provides a more effective fermentation process for butyric acid production from lignocellulosic biomass for future applications.
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Affiliation(s)
- Xue Chi
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China.
| | - Xin Wang
- School of Resources and Environment, Northeast Agriculture University, 59 Mucai Road, Harbin 150001, China
| | - Yafei Zhang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
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23
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Meng J, Li J, Li J, Antwi P, Deng K, Nan J, Xu P. Enhanced nitrogen removal from piggery wastewater with high NH 4+ and low COD/TN ratio in a novel upflow microaerobic biofilm reactor. Bioresour Technol 2018; 249:935-942. [PMID: 29145120 DOI: 10.1016/j.biortech.2017.10.108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 10/30/2017] [Accepted: 10/31/2017] [Indexed: 06/07/2023]
Abstract
To enhance nutrient removal more cost-efficiently in microaerobic process treating piggery wastewater characterized by high ammonium (NH4+-N) and low chemical oxygen demand (COD) to total nitrogen (TN) ratio, a novel upflow microaerobic biofilm reactor (UMBR) was constructed and the efficiency in nutrient removal was evaluated with various influent COD/TN ratios and reflux ratios. The results showed that the biofilm on the carriers had increased the biomass in the UMBR and enhanced the enrichment of slow-growth-rate bacteria such as nitrifiers, denitrifiers and anammox bacteria. The packed bed allowed the microaerobic biofilm process perform well at a low reflux ratio of 35 with a NH4+-N and TN removal as high as 93.1% and 89.9%, respectively. Compared with the previously developed upflow microaerobic sludge reactor, the UMBR had not changed the dominant anammox approach to nitrogen removal, but was more cost-efficiently in treating organic wastewater with high NH4+-N and low COD/TN ratio.
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Affiliation(s)
- Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jiuling Li
- Advanced Water Management Centre, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Kaiwen Deng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jun Nan
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Pianpian Xu
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
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Antwi P, Li J, Boadi PO, Meng J, Koblah Quashie F, Wang X, Ren N, Buelna G. Efficiency of an upflow anaerobic sludge blanket reactor treating potato starch processing wastewater and related process kinetics, functional microbial community and sludge morphology. Bioresour Technol 2017; 239:105-116. [PMID: 28501683 DOI: 10.1016/j.biortech.2017.04.124] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 04/26/2017] [Accepted: 04/28/2017] [Indexed: 06/07/2023]
Abstract
Herein, an upflow anaerobic sludge blanket reactor was employed to treat potato starch processing wastewater and the efficacy, kinetics, microbial diversity and morphology of sludge granules were investigated. When organic loading rate (OLR) ranging from 2.70 to 13.27kgCOD/m3.d was implemented with various hydraulic retention times (72h, 48h and 36h), COD removal could reach 92.0-97.7%. Highest COD removal (97.7%) was noticed when OLR was 3.65kgCOD/m3.d, but had declined to 92.0% when OLR was elevated to 13.27kgCOD/m3.d. Methane and biogas production increased from 0.48 to 2.97L/L.d and 0.90 to 4.28L/L.d, respectively. Kinetics and predictions by modified-Gompertz model agreed better with experimental data as opposed to first-order kinetic model. Functional population with highest abundance was Chloroflexi (28.91%) followed by Euryarchaeota (22.13%), Firmicutes (16.7%), Proteobacteria (16.25%) and Bacteroidetes (7.73%). Compared with top sludge, tightly-bound extracellular polymeric substances was high within bottom and middle sludge. Morphology was predominantly Methanosaeta-like cells, Methanosarcina-like cells, rods and cocci colonies.
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Affiliation(s)
- Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Portia Opoku Boadi
- School of Management, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin 150001, PR China.
| | - Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Frank Koblah Quashie
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Xin Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Gerardo Buelna
- Centre de Recherché Industrielle du Québec (CRIQ), 333 Franquet, Sainte-Foy, Québec G1P 4C7 Canada.
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Affiliation(s)
| | - Li Guoxin
- School of Management, Harbin Institute of Technology, Harbin, China
| | - Philip Antwi
- School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin, China
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Antwi P, Li J, Opoku Boadi P, Meng J, Shi E, Xue C, Zhang Y, Ayivi F. Functional bacterial and archaeal diversity revealed by 16S rRNA gene pyrosequencing during potato starch processing wastewater treatment in an UASB. Bioresour Technol 2017; 235:348-357. [PMID: 28384587 DOI: 10.1016/j.biortech.2017.03.141] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Revised: 03/17/2017] [Accepted: 03/22/2017] [Indexed: 06/07/2023]
Abstract
Microbial community structure of sludge sampled from an UASB treating potato starch processing wastewater (PSPW) was investigated. Operational taxonomic units revealed at 97% sequence identity tolerance was 2922, 2869 and 3919 for bottom, middle and top sections of the reactor, respectively. Overall abundant phylum observed within the UASB was low-G+C-Gram-positive bacteria affiliated to Firmicutes (26.01%) followed by Chloroflexi (16.70%), Proteobacteria (12.71%), Cloacimonetes (10.72%), Bacteroidetes (7.87%), Synergistetes (9.02%) and Euryarchaeota (8.82%). Whiles Firmicutes had dominated the bottom and top section by 34.01% and 28.64%, respectively, middle section was predominantly Euryarchaeota (24.32%) with major dominance in methanogens affiliated to genus Methanosaeta. The results demonstrated substantial stratification of the microbial community structure along the reactor height with various functional bacterial groups which subsequently allowed degradation of organics in PSPW in sequential mode. The findings herein would provide guidance for optimizing the anaerobic process and operation of the UASB.
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Affiliation(s)
- Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Portia Opoku Boadi
- School of Management, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin 150001, PR China
| | - Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - En Shi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Chi Xue
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Yupeng Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Frederick Ayivi
- Department of Geography, University of North Carolina, 237 Graham Building, 1009 Spring Garden St, Greensboro, NC 27412, USA
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Antwi P, Li J, Boadi PO, Meng J, Shi E, Deng K, Bondinuba FK. Estimation of biogas and methane yields in an UASB treating potato starch processing wastewater with backpropagation artificial neural network. Bioresour Technol 2017; 228:106-115. [PMID: 28056364 DOI: 10.1016/j.biortech.2016.12.045] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/08/2016] [Accepted: 12/11/2016] [Indexed: 06/06/2023]
Abstract
Three-layered feedforward backpropagation (BP) artificial neural networks (ANN) and multiple nonlinear regression (MnLR) models were developed to estimate biogas and methane yield in an upflow anaerobic sludge blanket (UASB) reactor treating potato starch processing wastewater (PSPW). Anaerobic process parameters were optimized to identify their importance on methanation. pH, total chemical oxygen demand, ammonium, alkalinity, total Kjeldahl nitrogen, total phosphorus, volatile fatty acids and hydraulic retention time selected based on principal component analysis were used as input variables, whiles biogas and methane yield were employed as target variables. Quasi-Newton method and conjugate gradient backpropagation algorithms were best among eleven training algorithms. Coefficient of determination (R2) of the BP-ANN reached 98.72% and 97.93% whiles MnLR model attained 93.9% and 91.08% for biogas and methane yield, respectively. Compared with the MnLR model, BP-ANN model demonstrated significant performance, suggesting possible control of the anaerobic digestion process with the BP-ANN model.
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Affiliation(s)
- Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Portia Opoku Boadi
- School of Management, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin 150001, PR China
| | - Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - En Shi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Kaiwen Deng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Francis Kwesi Bondinuba
- School of Energy, Geoscience, Infrastructure and Society, Institute for Social Policy, Housing, Environment and Real Estate, Heriot-Watt University, UK
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Shi E, Li J, Leu SY, Antwi P. Modeling the dynamic volatile fatty acids profiles with pH and hydraulic retention time in an anaerobic baffled reactor during the startup period. Bioresour Technol 2016; 222:49-58. [PMID: 27710907 DOI: 10.1016/j.biortech.2016.09.085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 09/13/2016] [Accepted: 09/17/2016] [Indexed: 06/06/2023]
Abstract
To predict the dynamic profiles in volatile fatty acids (VFAs) with pH and hydraulic retention time (HRT) during the startup of a 4-compartment ABR, a mathematical model was constructed by introducing pH and thermodynamic inhibition functions into the biochemical processes derived from the ADM1. The calibration of inhibition parameter for propionate uptake effectively improved the prediction accuracy of VFAs. The developed model could simulate the VFAs profiles very well no matter the observable change of pH or/and HRT. The simulation results indicated that both H2-producing acetogenesis and methanogenesis in the ABR would be inhibited with a pH less than 4.61, and the propionate oxidation could be thermodynamically restricted even with a neutral pH. A decreased HRT would enhanced the acidogenesis and H2-producing acetogenesis in the first 3 compartments, but no observable increase in effluent VFAs could be found due to the synchronously enhanced methanogenesis in the last compartment.
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Affiliation(s)
- En Shi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China.
| | - Shao-Yuan Leu
- Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong, China
| | - Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
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29
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Li J, Shi E, Antwi P, Leu SY. Modeling the performance of an anaerobic baffled reactor with the variation of hydraulic retention time. Bioresour Technol 2016; 214:477-486. [PMID: 27174615 DOI: 10.1016/j.biortech.2016.04.128] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Revised: 04/26/2016] [Accepted: 04/28/2016] [Indexed: 06/05/2023]
Abstract
Anaerobic baffled reactors (ABRs) have been widely used in engineering but very few models have been developed to simulate its performance. Based on the integration of biomass retention and liquid-gas mass transfer of biogas into the biochemical process derived in the International Water Association (IWA) Anaerobic Digestion Model No.1 (ADM1), a mathematical model was developed to predict volatile fatty acids (VFAs), chemical oxygen demand (CODCr) and biogas in a 4-compartment ABR operated with variable hydraulic retention time (HRT). The model was calibrated and validated with the experimental data obtained from the reactor when the HRT decreased from 2.0 to 1.0d by stages. It was found that the predicted VFAs, CODCr and biogas agreed well with the experimental data. Consequently, the developed model was a reliable tool to enhance the understanding among the mechanisms of the anaerobic digestion in ABRs, as well as to reactor's designing and operation.
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Affiliation(s)
- Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China.
| | - En Shi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, China
| | - Shao-Yuan Leu
- Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong, China
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Meng J, Li J, Li J, Sun K, Antwi P, Deng K, Wang C, Buelna G. Efficiency and bacterial populations related to pollutant removal in an upflow microaerobic sludge reactor treating manure-free piggery wastewater with low COD/TN ratio. Bioresour Technol 2016; 201:166-173. [PMID: 26649897 DOI: 10.1016/j.biortech.2015.11.054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 11/14/2015] [Accepted: 11/18/2015] [Indexed: 06/05/2023]
Abstract
A novel upflow microaerobic sludge reactor (UMSR) had proved excellent in nitrogen removal from manure-free piggery wastewater characterized by high concentration of ammonium (NH4(+)-N) and low chemical oxygen demand (COD) to total nitrogen (TN) ratio, but the biological mechanism in the UMSR was still indeterminate. With a constant nitrogen loading rate of 1.10kg/(m(3)d) at hydraulic retention time 8h, the UMSR was kept performing for 67days in the present research and the average load removal of COD, NH4(+)-N and TN was as high as 0.72, 0.76 and 0.94kg/(m(3)d), respectively. Compared with the inoculated sludge, the acclimated sludge was richer in genera responsible for the biological removal of carbon, nitrogen and phosphorus. Ammonium oxidation bacteria, heterotrophic denitrifiers, autotrophic denitrifiers and phosphate accumulating organisms coexisted perfectly in the microaerobic system, and their synergistic action made the UMSR perform well in COD, NH4(+)-N, TN and phosphate removal.
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Affiliation(s)
- Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jiuling Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Kai Sun
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Kaiwen Deng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Cheng Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Gerardo Buelna
- Centre de Recherche Industrielle du Québec, 333 Franquet, Québec G1P 4C7, Canada
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31
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Meng J, Li J, Li J, Antwi P, Deng K, Wang C, Buelna G. Nitrogen removal from low COD/TN ratio manure-free piggery wastewater within an upflow microaerobic sludge reactor. Bioresour Technol 2015; 198:884-890. [PMID: 26409858 DOI: 10.1016/j.biortech.2015.09.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 09/08/2015] [Accepted: 09/10/2015] [Indexed: 06/05/2023]
Abstract
An upflow microaerobic sludge reactor (UMSR) was constructed in treating manure-free piggery wastewater with high ammonium concentration and a COD/TN ratio as low as 0.84. The UMSR offered an outstanding removal of NH4(+)-N and TN at 35°C and hydraulic retention time 8h subsequent to inoculated sludge acclimation. A short NO2(-)-N accumulation phase was observed whenever there was a considerable increase in TN loading rate (NLR), but decreased rapidly along with an evident increase in TN removal. Fed with raw wastewater at a NLR of 1.10 kg/(m(3)d), the average COD, NH4(+)-N and TN removal reached 0.72, 0.76 and 0.94 kg/(m(3)d), respectively. Inference drawn from stoichiometry based on the potential nitrogen removal pathways and the C/N ratio required by denitrification indicated that anammox was the main mechanism for NH4(+)-N and TN removal in the UMSR.
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Affiliation(s)
- Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jiuling Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Kaiwen Deng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Cheng Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Gerardo Buelna
- Centre de Recherche Industrielle du Québec, 333 Franquet, Québec G1P 4C7, Canada
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Ankrah TC, Roberts MA, Antwi P, Atubrah MP, Bawuah PP, Kotoh S, Acheampong JW, Wood JG, Boateng KA, Mingle JA. The African AIDS case definition and HIV serology in medical in-patients at Komfo Anokye Teaching Hospital, Kumasi, Ghana. West Afr J Med 1994; 13:98-101. [PMID: 7803336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In 914 consecutive medical admissions to Komfo Anokye Teaching Hospital, the prevalence of infection with Human Immunodeficiency Virus type I (HIV-I) and Human Immunodeficiency Virus type 2 (HIV-2) was 12.6%. The prevalence in females was twice that found in males. The infection rate was maximum in the age group 25-29 years for females (45%) and 30-34 years for males (29%). There were 7 cases infected with HIV-2 alone, 55 cases infected with HIV-I alone and 53 cases with dual infection. The cases with HIV-2 infection tended to be older than those with HIV-I infection. For detecting HIV seropositivity in our patients the World Health Organization recommended case definition for AIDS in Africa gave a sensitivity of 32%, a specificity of 93% and a positive predictive value of 42%. The case definition gave the highest specificity and positive predictive values when cases of tuberculosis were not included in the analysis.
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Affiliation(s)
- T C Ankrah
- Department of Medicine, University of Science and Technology, Kumasi, Ghana
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Cronin W, Antwi P, Larson E. Collaborative education regarding prevention of human immunodeficiency virus transmission in healthcare settings--Ghana. Infect Control Hosp Epidemiol 1991; 12:718-24. [PMID: 1813578 DOI: 10.1086/646279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVE To evaluate the effectiveness of a collaborative and participatory approach to professional training to reduce the risk of human immunodeficiency virus (HIV) transmission. SETTING Healthcare settings in Ghana. METHODS Two 5-day workshops were conducted for high-level nurse educators and leaders who could contribute to national policy development. A combination of didactics, skill development sessions, field experiences, and development of draft national guidelines and curriculum were used. Outcomes evaluated were pre-to-post training changes in HIV knowledge and attitudes and changes in practice within selected healthcare settings. One-month follow-up visits (times not specified to participants) were used to evaluate outcomes. RESULTS At post-test, significantly fewer participants thought HIV was transmitted by saliva, sweat, or tears (chi square, p less than .0001), and significantly fewer reported hesitation to care for an HIV-infected patient because of lack of understanding about mode of transmission or because of lack of supplies, such as gloves (chi square, p less than .01). In field observations, there was an overall 42% improvement in specific infection control practices. CONCLUSIONS A collaborative and participatory approach to training can result in significant changes in infection control practices, even in settings with limited resources.
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Affiliation(s)
- W Cronin
- Johnson and Johnson Medical Inc., Arlington, Texas
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34
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Lovel H, Antwi P, Nottage BN. Yesterday's unwanted babies: today's teenage pregnancies. Lancet 1987; 1:1036-7. [PMID: 2883376 DOI: 10.1016/s0140-6736(87)92309-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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35
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Torigoe S, Biritwum RB, Isomura S, Kobune F, Mingle JA, Toba M, Antwi P, Ofosu-Amaah S. Measles in Ghana: a trial of an alternative means of administration of measles vaccine. J Trop Pediatr 1986; 32:304-59. [PMID: 3806758 DOI: 10.1093/tropej/32.6.304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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