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Ning R, Yu S, Li L, Snyder SA, Li P, Liu Y, Togbah CF, Gao N. Micro and nanobubbles-assisted advanced oxidation processes for water decontamination: The importance of interface reactions. WATER RESEARCH 2024; 265:122295. [PMID: 39173359 DOI: 10.1016/j.watres.2024.122295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2024] [Revised: 08/12/2024] [Accepted: 08/16/2024] [Indexed: 08/24/2024]
Abstract
Micro and nanobubbles (MNBs), as an efficient and convenient method, have been widely used in water treatment. Composed of gas and water, MNBs avoid directly introducing potential secondary pollutants. Notably, MNBs exhibit significant advantages through interface reactions in assisting AOPs. They overcome barriers like low mass transfer coefficients and limited reactive sites, and shorten the distance between pollutants and oxidants, achieving higher pollutant removal efficiency. However, there is a lack of systematic summary and in-depth discussion on the fundamental mechanisms of MNBs-assisted AOPs. In this critical review, the characteristics of MNBs related to water treatment are outlined first. Subsequently, the recent applications, performance, and mechanisms of MNBs-assisted AOPs including ozone, plasma, photocatalytic, and Fenton oxidation are overviewed. We conclude that MNBs can improve pollutant removal mainly by enhancing the utilization of reactive oxygen species (ROS) generated by AOPs due to the effective interface reactions. Furthermore, we calculated the electrical energy per order of reaction (EE/O) parameter of different MNBs-assisted AOPs, suggesting that MNBs can reduce the total energy consumption in most of the tested cases. Finally, future research needs/opportunities are proposed. The fundamental insights in this review are anticipated to further facilitate an in-depth understanding of the mechanisms of MNBs-assisted AOPs and supply critical guidance on developing MNBs-based technologies for water treatment.
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Affiliation(s)
- Rongsheng Ning
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Shuili Yu
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
| | - Lei Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
| | - Shane A Snyder
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Pan Li
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China
| | - Yanan Liu
- School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai, 201620, China
| | - Charles Flomo Togbah
- UNEP-Institute of Environment and Sustainable Development (IESD), Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Naiyun Gao
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China
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Wang T, Chen JL, Huang R, Wu LG, Chen KP, Wu JC, Chen HL. The remediation performance and mechanism for tetracycline from groundwater using controlled release materials containing mesoporous MnO x with different morphology. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024:125123. [PMID: 39414073 DOI: 10.1016/j.envpol.2024.125123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2024] [Revised: 09/18/2024] [Accepted: 10/13/2024] [Indexed: 10/18/2024]
Abstract
Aiming at the effective remediation of antibiotic contaminants in groundwater, in-situ chemical oxidation (ISCO), using controlled release materials (CRMs) as an oxidant deliverer, has emerged as a promising technique due to their long-term effective pollutant removal performance. This study used different microstructures of mesoporous manganese oxide (MnOx) and sodium persulfate as active components to fabricate CRMs. Following that, a comparative study of tetracycline (TC) degradation and the formation of reactive oxygen species (ROS) by mesoporous MnOx powder and CRMs were conducted. The ROS formed during peroxodisulfate (PDS) activation by powder catalysts and CRMs differed, but MnOx powder catalysts and CRMs both had good reaction stoichiometric efficiency (RSE) for PDS, thus completely mineralizing TC. In PDS activation by mesoporous MnOx powder, oxygen vacancies (OVs) caused by defects in the catalysts contributed to the generation of singlet oxygen (1O2). The 1O2 and free radicals (·SO4- and ·OH) both worked as major ROS participating in TC degradation. Concerning the release of CRMs in static groundwater, the immobilization of catalysts inside CRMs made it difficult to release 1O2 in the solution, thus slowing the degradation of TC by CRMs containing MnOx(1) in static groundwater. In the TC remediation in dynamic groundwater, the water flowing slowly passed through the CRM layer, and TC molecules were trapped. Therefore, 1O2 degraded the trapped TC in the CRM layer in dynamic groundwater. Compared to TC, the toxicity of most intermediates during the TC degradation by CRMs has decreased in static and dynamic groundwater.
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Affiliation(s)
- Ting Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China
| | - Jing-le Chen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China
| | - Rui Huang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China
| | - Li-Guang Wu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China
| | - Kou-Ping Chen
- School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China.
| | - Ji-Chun Wu
- School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China
| | - Hua-Li Chen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310018, China.
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Zhang M, Feng M, Xu Z, Li J, Peng C. Electrokinetically-delivered persulfate coupled with thermal conductive heating for remediation of petroleum hydrocarbons contaminated low permeability soil. CHEMOSPHERE 2024; 356:141914. [PMID: 38588899 DOI: 10.1016/j.chemosphere.2024.141914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 03/21/2024] [Accepted: 04/04/2024] [Indexed: 04/10/2024]
Abstract
In this study, electrokinetically-delivered persulfate (PS) coupled with thermal conductive heating (TCH) method was proposed for the remediation of petroleum hydrocarbons (PHs) contaminated low-permeability soil, based on the investigation of PS injection and activation by different electric field form, effective heating radius of TCH to activate PS, and their influencing factors. The uniform delivery and effective activation of PS were unrealizable by one-dimensional electric field (1 V/cm) with the operation of cathode injection, anode injection, bipolar injection, polarity-reversal, or bipolar injection coupled polarity-reversal, which would result in large spatial difference of soil pH and PHs residual. Similar results were obtained under the two-dimensional symmetric electric field (TEF) due to the large spatial difference in electric field intensity. Superimposed electric field (SEF, 1 V/cm) that based on the intermittent worked electrode groups coupled with polarity-reversal (every 3 h) and bipolar injection (10% PS solution) operation could achieve homogenized mass transfer of PS (53.8-65.7 g/kg, average 60.0 g/kg) in 15 days, due to the positive correlation between electric field intensity and transport of ionic substance. Meanwhile, the difference in decontamination efficiency caused by difference in PS activation efficiency could be reduced, since the heating rod was placed at the position where the concentrations of PS was the lowest, whereat the removal of PHs could not rely on alkali activated PS (cathode), anodic oxidation (anode), and electrochemical activated PS (cathode and anode). The residual concentration of PHs in soil remediated by SEF/PS-TCH was in the range of 640.7-763.8 mg/kg (average 701.5 mg/kg), and the corresponding removal efficiency was 73.3%-77.6% (average75.4%). The research can provide an in-situ remediation method for organic contaminants in low permeability soil featured with more uniform PS injection and activation, and small spatial differences in remediation efficiency.
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Affiliation(s)
- Meng Zhang
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Meiyun Feng
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Zhiqiang Xu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Jianan Li
- Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China; State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China; Zhejiang Tiandi Environmental Protection Technology Co., Ltd., Hangzhou, 310000, China.
| | - Chong Peng
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
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Shen D, Li L, Luo J, Jia J, Tang L, Long Y, Shentu J, Lu L, Liu W, Qi S. Enhanced removal of toluene in heterogeneous aquifers through injecting encapsulated ozone micro-nano bubble water. JOURNAL OF HAZARDOUS MATERIALS 2024; 468:133810. [PMID: 38382340 DOI: 10.1016/j.jhazmat.2024.133810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 02/04/2024] [Accepted: 02/14/2024] [Indexed: 02/23/2024]
Abstract
Organic contaminants have a tendency to accumulate in low-permeability aquifers, making their removal challenging and creating a bottleneck in groundwater remediation efforts. The use of ozone micro-nano bubbles, due to their smaller size compared to traditional macrobubbles, shows potential for efficient penetration into the low-permeability aquifer and effective oxidization of contaminants. This study conducted batch experiments, column studies, and 2D tank experiments to systematically investigate the remediation efficiency of toluene in a heterogeneous aquifer using ozonated water (OW), ozone micro-bubble water (OMBW), and encapsulated ozone micro-nano bubble water (EOMBW) with rhamnolipid. Experimental results showed that rhamnolipid effectively increased the densities and reduced the sizes of micro-nano bubbles, leading to improved ozone preservation and enhanced toluene degradation. Nanobubbles exhibited higher mobility compared to microbubbles in porous media, while rhamnolipid increased the density of penetrated nanobubbles by 9.6 times. EOMBW demonstrated superior efficiency in oxidizing toluene in low-permeability aquifers, and a numerical model was developed to successfully simulate the ozone and toluene concentration. The model revealed that the increased oxidation rate by EOMBW was attributed to the preservation of ozone in micro-nano bubbles and the enhanced toluene oxidation rate. These findings contribute significantly to the application of EOMBW in heterogeneous aquifer remediation.
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Affiliation(s)
- Dongsheng Shen
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Lili Li
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Jian Luo
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0355, United States
| | - Jia Jia
- Eco-Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou 310012, PR China
| | - Lu Tang
- Hangzhou Environmental Protection Co., Ltd, Hangzhou 310000, PR China
| | - Yuyang Long
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Jiali Shentu
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Li Lu
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Weilin Liu
- School of Food Science and Biotechnology, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Shengqi Qi
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Zhejiang Engineering Research Center of Non-ferrous Metal Waste Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China.
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Lamssali M, Luster-Teasley S, Deng D, Sirelkhatim N, Doan Y, Kabir MS, Zeng Q. Release efficiencies of potassium permanganate controlled-release biodegradable polymer (CRBP) pellets embedded in polyvinyl acetate (CRBP-PVAc) and polyethylene oxide (CRBP- PEO) for groundwater treatment. Heliyon 2023; 9:e20858. [PMID: 37867834 PMCID: PMC10585301 DOI: 10.1016/j.heliyon.2023.e20858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 10/06/2023] [Accepted: 10/09/2023] [Indexed: 10/24/2023] Open
Abstract
In-situ chemical oxidation (ISCO) is a commonly used method for the remediation of environmental contaminants in groundwater systems. However, traditional ISCO methods are associated with several limitations, including safety and handling concerns, rebound of groundwater contaminants, and difficulty in reaching all areas of contamination. To overcome these limitations, novel Controlled-Release Biodegradable Polymer (CRBP) pellets containing the oxidant KMnO₄ were designed and tested. The CRBP pellets were encapsulated in Polyvinyl Acetate (CRBP-PVAc) and Polyethylene Oxide (CRBP-PEO) at different weight percentages, baking temperatures, and time. Their release efficiency was tested in water, soil, and water and soil mixture media. Results showed that CRBP-PVAc pellets with 60 % KMnO₄ and baked at 120 °C for 2 min had the highest release percentage and rate across different conditions tested. Natural organic matter was also found to be an important factor to consider for in-field applications due to its potential reducing effect with Mn O 4 - . Overall, the use of CRBP pellets offers an innovative and sustainable solution to remediate contaminated groundwater systems, with the potential to overcome traditional ISCO limitations. These findings suggest that CRBP pellets could provide sustained and controlled release of the oxidant, reducing the need for multiple injections and minimizing safety and handling concerns. This study represents an important step towards developing a new and effective approach for ISCO remediation.
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Affiliation(s)
- Mehdi Lamssali
- Department of Built Environment, North Carolina A&T State University, 27411, Greensboro, NC, United States
| | - Stephanie Luster-Teasley
- Provost and VC for Academic Affairs, North Carolina A&T State University, 27411, Greensboro, NC, United States
| | - Dongyang Deng
- Department of Built Environment, North Carolina A&T State University, 27411, Greensboro, NC, United States
| | - Nafisa Sirelkhatim
- Dean's Office, Joint School of Nanoscience and Nanoengineering, 27401, Greensboro, NC, United States
| | - Yen Doan
- Department of Civil, Architectural and Environmental Engineering, North Carolina A&T State University, 27411, Greensboro, NC, United States
| | - Mosarrat Samiha Kabir
- Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, 27401, Greensboro, NC, United States
| | - Qingan Zeng
- Department of Computer Systems Technology, North Carolina A&T State University, 27411, Greensboro, NC, United States
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Sheng X, Lyu S. Insights into enhanced removal of fluoranthene by sulfidated nanoscale zero-valent iron: In aqueous solution and soil slurry. CHEMOSPHERE 2023; 312:137172. [PMID: 36356808 DOI: 10.1016/j.chemosphere.2022.137172] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 10/31/2022] [Accepted: 11/05/2022] [Indexed: 06/16/2023]
Abstract
In this study, 90.9% fluoranthene (FLT) was degraded in sodium percarbonate (2Na2CO3·3H2O2, SPC) oxidation system by Fe(II) combined with sulfidated nano zero valent iron (S-nZVI) activation within 60 min in aqueous solution. Scavenging experiments and electron paramagnetic resonance detection suggested that HO•, O2-•, and 1O2 contributed to the removal of FLT in SPC/Fe(II)/S-nZVI system. Based on the FLT degradation intermediates that were analyzed by GC-MS in SPC/Fe(II)/S-nZVI process, three potential FLT degradation pathways were speculated. The removal efficiency of FLT was inhibited with the presence of humic acid (HA) unless the concentration of HA was controlled at 1.0 mg L-1, and the presence of 1.0 mg L-1 HA favored the generation of HO•. The excellent removal performance of FLT (88.6%) could be achieved in actual groundwater by increasing the chemical dosages and adjusting the initial solution pH to acid environment. In soil slurry tests, the optimal reaction time and soil/water ratio were obtained as 24 h and 2/10, respectively, and the desired FLT degradation performances were obtained at pH 3 and 5 with the soil/water ratio of 2/10. This work effectively demonstrates the application potential of SPC/Fe(II)/S-nZVI system for the remediation of PAHs contamination in actual industrial sites.
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Affiliation(s)
- Xianxian Sheng
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
| | - Shuguang Lyu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
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Song Q, Xue Z, Wu H, Zhai Y, Lu T, Du X, Zheng J, Chen H, Zuo R. The collaborative monitored natural attenuation (CMNA) of soil and groundwater pollution in large petrochemical enterprises: A case study. ENVIRONMENTAL RESEARCH 2023; 216:114816. [PMID: 36400217 DOI: 10.1016/j.envres.2022.114816] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 11/07/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
A large in-service petrochemical enterprises in Northeast China was taken as the research object, and the Collaborative Monitored Natural Attenuation (CMNA) for soil and groundwater pollution was carried out to remedy combined pollution and reduce environmental risks. The pollutants distributions were obtained based on detailed regional investigation (Mar. 2019), and feature pollutants in soil and groundwater were then screened. The spatiotemporal variations of feature pollutants and relative microbial responses were explored during the CMNA process. Furthermore, the CMNA efficiency of the contaminated site at initial stage was evaluated by calculation of natural attenuation rate constant. The results showed that the feature pollutants in soil were 2,2',5,5'-tetrachlorobiphenyl (2,2',5,5'-TCB) and petroleum hydrocarbons (C10∼C40), and the feature pollutant in groundwater was 1,2-dichloroethane (1,2-DCA). The concentrations of all feature pollutants decreased continuously during four years of monitoring. Feature pollutants played a dominant role in the variability of microbial species both in soil and groundwater, increasing the relative abundance of petroleum tolerant/biodegradation bacteria, such as Actinobacteria, Proteobacteria and Acidobacteriota. The average natural attenuation rate constant of 2,2',5,5'-TCB and C10∼C40 in soil was 0.0012 d-1 and 0.0010 d-1, respectively, meeting the screening value after four years' attenuation. The average natural attenuation rate constant of 1,2-DCA was 0.0004 d-1, which need strengthening measures to improve the attenuation efficiency.
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Affiliation(s)
- Quanwei Song
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China; CNPC Research Institute of Safety and Environment Technology, Beijing, 102206, China
| | - Zhenkun Xue
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China; CNPC Research Institute of Safety and Environment Technology, Beijing, 102206, China; College of Water Science, Beijing Normal University, Beijing, 100875, China
| | - Huijun Wu
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China; CNPC Research Institute of Safety and Environment Technology, Beijing, 102206, China
| | - Yong Zhai
- China Kunlun Contracting & Engineering Co., Ltd., Jilin Branch, Jilin, 132013, China
| | - Taotao Lu
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China; CNPC Research Institute of Safety and Environment Technology, Beijing, 102206, China
| | - Xianyuan Du
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China; CNPC Research Institute of Safety and Environment Technology, Beijing, 102206, China
| | - Jin Zheng
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China; CNPC Research Institute of Safety and Environment Technology, Beijing, 102206, China
| | - Hongkun Chen
- State Key Laboratory of Petroleum Pollution Control, Beijing, 102206, China; CNPC Research Institute of Safety and Environment Technology, Beijing, 102206, China.
| | - Rui Zuo
- College of Water Science, Beijing Normal University, Beijing, 100875, China
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Abstract
Ozone (O3) has been widely used for water and wastewater treatment due to its strong oxidation ability, however, the utilization efficiency of O3 is constrained by its low solubility and short half-life during the treatment process. Thereby, an integrated approach using novel nanobubble technology and ozone oxidation method was studied in order to enhance the ozonization of ammonia. Artificial wastewater (AW) with an initial concentration of 1600 mg/L ammonia was used in this study. In the ozone-nanobubble treatment group, the concentration of nano-sized bubbles was 2.2 × 107 particles/mL, and the bubbles with <200 nm diameter were 14 times higher than those in the ozone-macrobubble treatment control group. Ozone aeration was operated for 5 min in both nanobubble treatment and control groups, however, the sampling and measurement were conducted for 30 min to compare the utilization of O3 for ammonia oxidation. H+ was the by-product of the ammonia ozonation process, thus the pH decreased from 8 to 7 and 7.5 in nanobubble treatment and control groups, respectively, after 30 min of operation. The fast removal of ammonia was observed in both systems in the first 10 min, where the concentration of ammonia decreased from 1600 mg/L to 835 and 1110 mg/L in nanobubble treatment and control groups, respectively. In the nanobubble treatment group, ammonia concentrations kept the fast-decreasing trend and reached the final removal performance of 82.5% at the end of the experiment, which was significantly higher than that (44.2%) in the control group. Moreover, the first-order kinetic model could be used to describe the removal processes and revealed a significantly higher kinetic rate constant (0.064 min−1) compared with that (0.017 min−1) in the control group. With these results, our study highlights the viability of the proposed integrated approach to enhance the ozonation of a high level of ammonia in contaminated water.
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Fan W, An W, Huo M, Xiao D, Lyu T, Cui J. An integrated approach using ozone nanobubble and cyclodextrin inclusion complexation to enhance the removal of micropollutants. WATER RESEARCH 2021; 196:117039. [PMID: 33761397 DOI: 10.1016/j.watres.2021.117039] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 03/08/2021] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
Ozone (O3) has been widely used for the elimination of recalcitrant micropollutants in aqueous environments, due to its strong oxidation ability. However, the utilization efficiency of O3 is constrained by its low solubility and short half-life during the treatment process. Herein, an integrated approach, using nanobubble technology and micro-environmental chemistry within cyclodextrin inclusion cavities, was studied in order to enhance the reactivity of ozonisation. Compared with traditional macrobubble aeration with O3 in water, nanobubble aeration achieved 1.7 times higher solubility of O3, and increased the mass transfer coefficient 4.7 times. Moreover, the addition of hydroxypropyl-β-cyclodextrin (HPβCD) further increased the stability of O3 through formation of an inclusion complex in its molecule-specific cavity. At a HPβCD:O3 molar ratio of 10:1, the lifespan of O3 reached 18 times longer than in a HPβCD-free O3 solution. Such approach accelerated the removal efficiency of the model micropollutant, 4-chlorophenol by 6.9 times, compared with conventional macrobubble ozonation. Examination of the HPβCD inclusion complex by UV-visible spectroscopy and Nuclear Magnetic Resonance analyses revealed that both O3 and 4-chlorophenol entered the HPβCD cavity, and Benesi-Hildebrand plots indicated a 1:1 stoichiometry of the host and guest compounds. Additionally, molecular docking simulations were conducted in order to confirm the formation of a ternary complex of HPβCD:4-chlorophenol:O3 and to determine the optimal inclusion mode. With these results, our study highlights the viability of the proposed integrated approach to enhance the ozonation of organic micropollutants.
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Affiliation(s)
- Wei Fan
- School of Environment, Northeast Normal University, 2555 Jingyue Street, Changchun 130117, China
| | - Wengang An
- School of Environment, Northeast Normal University, 2555 Jingyue Street, Changchun 130117, China
| | - Mingxin Huo
- School of Environment, Northeast Normal University, 2555 Jingyue Street, Changchun 130117, China
| | - Dan Xiao
- Jilin Academy of Agricultural Science, 1363 Shengtai Street, Changchun 130033, China.
| | - Tao Lyu
- Cranfield Water Science Institute, Cranfield University, College Road, Cranfield, Bedfordshire MK43 0AL, United Kingdom.
| | - Jingyu Cui
- School of Environment, Northeast Normal University, 2555 Jingyue Street, Changchun 130117, China
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Shemawar, Mahmood A, Hussain S, Mahmood F, Iqbal M, Shahid M, Ibrahim M, Ali MA, Shahzad T. Toxicity of biogenic zinc oxide nanoparticles to soil organic matter cycling and their interaction with rice-straw derived biochar. Sci Rep 2021; 11:8429. [PMID: 33875737 PMCID: PMC8055651 DOI: 10.1038/s41598-021-88016-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 04/07/2021] [Indexed: 02/02/2023] Open
Abstract
Given the rapidly increasing use of metal oxide nanoparticles in agriculture as well as their inadvertent addition through sewage sludge application to soils, it is imperative to assess their possible toxic effects on soil functions that are vital for healthy crop production. In this regard, we designed a lab study to investigate the potential toxicity of one of the most produced nanoparticles, i.e. zinc oxide nanoparticles (nZnO), in a calcareous soil. Microcosms of 80 g of dry-equivalent fresh soils were incubated in mason jars for 64 days, after adding 100 or 1000 mg of biogenically produced nZnO kg-1 soil. Moreover, we also added rice-straw derived biochar at 1 or 5% (w: w basis) hypothesizing that the biochar would alleviate nZnO-induced toxicity given that it has been shown to adsorb and detoxify heavy metals in soils. We found that the nZnO decreased microbial biomass carbon by 27.0 to 33.5% in 100 mg nZnO kg-1 soil and by 39.0 to 43.3% in 1000 mg nZnO kg-1 soil treatments across biochar treatments in the short term i.e. 24 days after incubation. However, this decrease disappeared after 64 days of incubation and the microbial biomass in nZnO amended soils were similar to that in control soils. This shows that the toxicity of nZnO in the studied soil was ephemeral and transient which was overcome by the soil itself in a couple of months. This is also supported by the fact that the nZnO induced higher cumulative C mineralization (i.e. soil respiration) at both rates of addition. The treatment 100 mg nZnO kg-1 soil induced 166 to 207%, while 1000 mg nZnO kg-1 soil induced 136 to 171% higher cumulative C mineralization across biochar treatments by the end of the experiment. However, contrary to our hypothesis increasing the nZnO addition from 100 to 1000 mg nZnO kg-1 soil did not cause additional decrease in microbial biomass nor induced higher C mineralization. Moreover, the biochar did not alleviate even the ephemeral toxicity that was observed after 24d of incubation. Based on overall results, we conclude that the studied soil can function without impairment even at 1000 mg kg-1 concentration of nZnO in it.
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Affiliation(s)
- Shemawar
- grid.411786.d0000 0004 0637 891XDepartment of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
| | - Abid Mahmood
- grid.411786.d0000 0004 0637 891XDepartment of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
| | - Sabir Hussain
- grid.411786.d0000 0004 0637 891XDepartment of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
| | - Faisal Mahmood
- grid.411786.d0000 0004 0637 891XDepartment of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
| | - Muhammad Iqbal
- grid.411786.d0000 0004 0637 891XDepartment of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
| | - Muhammad Shahid
- grid.411786.d0000 0004 0637 891XDepartment of Bioinformatics and Biotechnology, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
| | - Muhammad Ibrahim
- grid.411786.d0000 0004 0637 891XDepartment of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
| | - Muhammad Arif Ali
- grid.411501.00000 0001 0228 333XDepartment of Soil Science, Bahauddin Zakariya University, Multan, Pakistan
| | - Tanvir Shahzad
- grid.411786.d0000 0004 0637 891XDepartment of Environmental Sciences and Engineering, Government College University Faisalabad, Allama Iqbal Road, Faisalabad, 38000 Pakistan
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