101
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Yang GCC. Integrated electrokinetic processes for the remediation of phthalate esters in river sediments: A mini-review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 659:963-972. [PMID: 31096426 DOI: 10.1016/j.scitotenv.2018.12.334] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 11/29/2018] [Accepted: 12/22/2018] [Indexed: 06/09/2023]
Abstract
Concerning the contamination of phthalate esters (PAEs) in river sediments, this mini-review introduces four recently reported novel "integrated electrokinetic (EK) processes" for the remediation purpose, namely two combined technologies of the EK process and advanced oxidation process (EK-AOP Processes) and two combined technologies of the EK process and biological process (EK-BIO Processes). The following is a comprehensive summary for these remediation processes: (1) the EK process coupled with nano-Fe3O4/S2O82- oxidation process - Test results have shown that nanoscale Fe3O4 played a significant role in activating persulfate oxidation. Even a recalcitrant compound like di(2‑ethylhexyl)phthalate (DEHP), its concentration in test sediment was reduced to 1.97 mg kg-1, far below the regulatory levels set by Taiwan EPA; (2) the EK process integrated with a novel Fenton-like process catalyzed by nanoscale schwertmannite (nano-SHM) - Test results have revealed that simultaneous injection of nano-SHM slurry and H2O2 into the anode reservoir and sediment compartment is a good practice. 70-99% in removal efficiency was obtained for various target PAEs; (3) enhanced in situ bioremediation coupled with the EK process for promoting the growth of intrinsic microorganisms by adding H2O2 as an oxygen release compound (ORC) - Test results have demonstrated that an intermittent mode of injecting lab-prepared ORC directly into the contaminant zone would be beneficial to the growth of intrinsic microorganisms in test sediment for in situ bioremediation of target PAEs; and (4) coupling of a second-generation ORC (designated 2G-ORC) with the EK-biological process - Test results have proved that 2G-ORC is long-lasting and can be directly utilized as the carbon source and oxygen source for microbial growth resulting in an enhanced biodegradation of PAEs. Except DEHP having a residual concentration of 4 μg kg-1, all other target PAEs in test sediment were totally removed by this novel combined remediation process.
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Affiliation(s)
- Gordon C C Yang
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan.
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102
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Zheng M, Li Y, Ping Q, Wang L. MP-UV/CaO 2 as a pretreatment method for the removal of carbamazepine and primidone in waste activated sludge and improving the solubilization of sludge. WATER RESEARCH 2019; 151:158-169. [PMID: 30594084 DOI: 10.1016/j.watres.2018.11.086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/29/2018] [Accepted: 11/30/2018] [Indexed: 06/09/2023]
Abstract
Medium-pressure ultraviolet light (MP-UV) combined with calcium peroxide (CaO2) as a pretreatment technology for removing carbamazepine (CBZ) and primidone (PMD) in waste active sludge (WAS) and improving the solubilization of sludge were investigated. CBZ and PMD were effectively removed and the removal fitted pseudo-first kinetics under MP-UV/CaO2 treatment with R2 > 0.97. The higher CaO2 dosage and lower initial volatile suspended solids (VSS) concentration were conductive to the removal of CBZ and PMD. Of the CaO2 hydrolysates, Ca(OH)2 played a more important role than H2O2 during MP-UV/CaO2 treatment. The removal of the target compounds was attributed to direct photolysis and indirect photolysis caused by •OH, 3DOM*, and 1O2, in which •OH played a vital role with > 62.2% contribution to the overall degradation rate. A model predicting the steady concentration of •OH in WAS ([VSS] ≈ 8.6 g L-1) under MP-UV/CaO2 treatment with CaO2 dosage ranging from 0 to 0.5 g g-1-VSS was proposed and validated. Moreover, major intermediates of CBZ and PMD were detected and the probable transformation pathways during MP-UV/CaO2 treatment were proposed. In addition, MP-UV/CaO2 promoted the sludge solubilization effectively. Considering both the pharmaceutical degradation and sludge solubilization, the optimum operation condition with 0.2 g-CaO2 g-1-VSS combined with 7 h MP-UV irradiation is recommended. Under this condition, more than 92.3% of CBZ and 90.3% of PMD were removed, and soluble chemical oxygen demand (SCOD) increased by 657% and 13.6% compared with sole 10 h CaO2 (0.2 g g-1-VSS) treatment and 7 h MP-UV treatment, respectively.
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Affiliation(s)
- Ming Zheng
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Yongmei Li
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
| | - Qian Ping
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Lin Wang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China
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103
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Wang Z, Zhang Y, Tan Z, Li Q. Thermodynamic and kinetic performance of an S
2
O
8
2‐
/CaO
2
solution for NO removal. CAN J CHEM ENG 2019. [DOI: 10.1002/cjce.23447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zhiping Wang
- Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing100084P. R. China
- Tsinghua University‐University of Waterloo Joint Research Center for Micro/Nano Energy & Environment TechnologyTsinghua UniversityBeijing100084P. R. China
| | - Yanguo Zhang
- Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing100084P. R. China
- Tsinghua University‐University of Waterloo Joint Research Center for Micro/Nano Energy & Environment TechnologyTsinghua UniversityBeijing100084P. R. China
| | - Zhongchao Tan
- Department of Mechanical & Mechatronics EngineeringUniversity of WaterlooWaterlooON, N2L 3G1Canada
- Tsinghua University‐University of Waterloo Joint Research Center for Micro/Nano Energy & Environment TechnologyTsinghua UniversityBeijing100084P. R. China
| | - Qinghai Li
- Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationDepartment of Energy and Power EngineeringTsinghua UniversityBeijing100084P. R. China
- Tsinghua University‐University of Waterloo Joint Research Center for Micro/Nano Energy & Environment TechnologyTsinghua UniversityBeijing100084P. R. China
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104
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Wang Y, Wang WH, Yan FL, Ding Z, Feng LL, Zhao JC. Effects and mechanisms of calcium peroxide on purification of severely eutrophic water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 650:2796-2806. [PMID: 30373057 DOI: 10.1016/j.scitotenv.2018.10.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 10/03/2018] [Accepted: 10/03/2018] [Indexed: 06/08/2023]
Abstract
In consideration of severe eutrophication of scenic water caused by pollutants released from sediments in summer, calcium peroxide (CaO2) was adopted as the slow release peroxide to improve the water quality in a field experiment of 600 m2. The effect of CaO2 on the overlying water, interstitial water, sediment, and sediment microorganisms of scenic water was studied. Results for two months indicated that the dissolved oxygen (DO) concentration of the overlying water in the test zone was 3.78 times that in the control zone; the oxidation-reduction potential (ORP) in the overlying water and sediment increased significantly (p = 0.002 and p = 0). Meanwhile, CaO2 could effectively inhibit the release of nitrogen (N) and phosphorus (P) from the sediment and could obviously reduce the concentrations of N and P in the overlying water by enhancing the microbiological action. Moreover, the average concentrations of total nitrogen and total phosphorus in the overlying water of the test zone were 46.27% and 50.51% of those in control zone, respectively, and the concentrations of N and P in the interstitial water decreased during the entire experiment. In addition, CaO2 decreased the relative abundance of anaerobic bacteria in the sediment, whereas it increased that of aerobic bacteria and promoted the appearance of the functional bacteria, such as Nitrospirae and Thermodesulfoba. In conclusion, CaO2 can improve the DO and ORP in the eutrophic water effectively and change the microbial community in the sediment to a certain extent, thereby controlling the pollutants released from the sediment and reducing the N and P concentrations in the overlying water. Thus, CaO2 can effectively realize the purification and restoration of the severely eutrophic scenic water.
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Affiliation(s)
- Yi Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
| | - Wen-Huai Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
| | - Fei-Long Yan
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
| | - Zhuo Ding
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
| | - Lin-Lin Feng
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, China.
| | - Jing-Chan Zhao
- College of Chemistry & Materials Science, Northwest University, Xi'an 710069, China.
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105
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Kang JI, Park KM, Park KD. Oxygen-generating alginate hydrogels as a bioactive acellular matrix for facilitating wound healing. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.09.048] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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106
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Xue Y, Sui Q, Brusseau ML, Zhang X, Qiu Z, Lyu S. Insight on the generation of reactive oxygen species in the CaO 2/Fe(II) Fenton system and the hydroxyl radical advancing strategy. CHEMICAL ENGINEERING JOURNAL (LAUSANNE, SWITZERLAND : 1996) 2018; 353:657-665. [PMID: 31467481 PMCID: PMC6715144 DOI: 10.1016/j.cej.2018.07.124] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Calcium peroxide (CaO2) is a stable hydrogen peroxide (H2O2) carrier, and the CaO2/Fe(II) system has been applied for treatment of various pollutants. It is commonly reported in the literature that hydroxyl radical (HO●) and superoxide radical anions (O2 ●-) are the two main reactive oxygen species (ROSs) generated in the CaO2/Fe(II) system. However, many of the reported results were deduced from degradation performance rather than specific testing of radical generation. Thus, the specific generation of ROSs and the influence of system conditions on ROSs yield is still unclear. To our knowledge, this is the first study specifically focusing on the generation of HO● and O2 ●- in the CaO2/Fe(II) system. Experimental conditions were optimized to investigate the production of HO● and O2 ●-. The results showed the influences of CaO2, Fe(II), and solution pH on HO● and O2 ●- generation, and the HO● generation efficiency was reported for the first time. In addition, the ROSs generation pathways in the CaO2/Fe(II) system were elucidated. A strategy for enhancing HO● yield is developed, based on the continuously dosing Fe(II). This proposed strategy has implications for the effective application of in situ chemical oxidation employing CaO2/Fe(II) for groundwater remediation.
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Affiliation(s)
- Yunfei Xue
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Qian Sui
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Mark L. Brusseau
- Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, The University of Arizona, Tucson, AZ 85721, United States
| | - Xiang Zhang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Zhaofu Qiu
- 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
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
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107
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Hyperbaric oxygen-generating hydrogels. Biomaterials 2018; 182:234-244. [DOI: 10.1016/j.biomaterials.2018.08.032] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 08/14/2018] [Accepted: 08/14/2018] [Indexed: 12/11/2022]
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108
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Mosmeri H, Gholami F, Shavandi M, Alaie E, Dastgheib SMM. Application of magnesium peroxide (MgO 2) nanoparticles for toluene remediation from groundwater: batch and column studies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:31051-31061. [PMID: 30187405 DOI: 10.1007/s11356-018-2920-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2018] [Accepted: 08/06/2018] [Indexed: 06/08/2023]
Abstract
In the present study, magnesium peroxide (MgO2) nanoparticles were synthesized by electro-deposition process and characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The batch experiments were conducted to evaluate the MgO2 half-life (600 mg/L) in groundwater under various temperatures (4, 15, and 30 °C) and initial pH (3, 7, and 12). The effect of Fe2+ ions (enhanced oxidation) on the toluene remediation by MgO2 was also investigated. Nanoparticles were injected to sand-packed continuous-flow columns, and toluene removal (50 ppm) was studied within 50 days at 15 °C. The results indicated that the half-life of MgO2 at pH 3 and 12 were 5 and 15 days, respectively, in comparison to 10 days at the initial pH 7 and 15 °C. The nanoparticles showed 20 and 7.5 days half-life at 4 and 30 °C temperatures, respectively. Injection of Fe2+ ions indicated an impressive effect on toluene removal by MgO2, and the contaminant was completely removed after 5 and 10 days, in the batch and column experiments, respectively. Confocal laser scanning microscope (CLSM) analysis indicated that the attached biofilm had a significant role in the decontamination of groundwater. Comparison of bioremediation and enhanced oxidation resulted in a considerable insight into the application of magnesium peroxide in groundwater remediation. Graphical abstract ᅟ.
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Affiliation(s)
- Hamid Mosmeri
- Ecology and Environmental Pollution Control Research Group, Research Institute of Petroleum Industry, West Blvd. of Azadi sport Complex, P.O.Box: 14665-137, Tehran, Iran
| | - Fatemeh Gholami
- Department of Microbiology, College of Science, University of Tehran, Tehran, Iran
| | - Mahmoud Shavandi
- Ecology and Environmental Pollution Control Research Group, Research Institute of Petroleum Industry, West Blvd. of Azadi sport Complex, P.O.Box: 14665-137, Tehran, Iran.
| | - Ebrahim Alaie
- Environment and Biotechnology Research Division, Research Institute of Petroleum Industry, Tehran, Iran
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109
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Tang P, Jiang W, Lyu S, Qiu Z, Sui Q. Ethanol enhanced carbon tetrachloride degradation in Fe(II) activated calcium peroxide system. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2018.05.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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110
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Electrolytic control of hydrogen peroxide release from calcium peroxide in aqueous solution. Electrochem commun 2018; 93:81-85. [PMID: 30542246 DOI: 10.1016/j.elecom.2018.06.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The in situ generation of hydrogen peroxide (H2O2) for water treatment is more practical than the use of liquid H2O2, which is costly to store and transport. Calcium peroxide (CaO2), a solid carrier of H2O2, can release H2O2 on dissolution in water. However, the constant H2O2 release rate of CaO2 has been a bottleneck constraining its wider application. In this study, a practical electrochemical method using a divided cell is developed to control the rate of release of H2O2 from CaO2. The results show that the rate of H2O2 release from CaO2 is enhanced in the anolyte. The increase in H2O2 release is positively correlated with the current. Under a current of 100 mA, the H2O2 concentration was 2.5 times higher after 30 min of electrolysis than in the control experiment in which no current was applied. Water electrolysis in the anodic compartment generates protons that not only: (i) en-hance dissolution of CaO2 and release of H2O2, but also (ii) neutralize the alkaline pH resulting from CaO2 dissolution, thus providing new advantages for the use of CaO2. This effective technique may be suitable for the sophisticated control of H2O2 release in environmental applications.
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111
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Li ZH, Zhu YM, Zhang J, Yang CJ, Zhang TY, Yu HQ. Evaluation of robustness of activated sludge using calcium-induced enhancement of respiration. BIORESOURCE TECHNOLOGY 2018; 253:55-63. [PMID: 29328935 DOI: 10.1016/j.biortech.2018.01.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 12/28/2017] [Accepted: 01/03/2018] [Indexed: 06/07/2023]
Abstract
Robustness of an activated sludge system, describing uncertainty and operational risk, was evaluated using the absence or presence of calcium-induced enhancement of respiration (CaER) effect. Generally, the fast-growing system was susceptible to external environmental variations, of which the sludge exhibited significant CaER effect under normal operational conditions, while the slow growing system showed less significant CaER effect. However, sludge in both systems exhibited CaER effect under stressed conditions of decreasing temperature or ammonia shocking. Therefore, the absence of CaER effect indicates a more robust system, while the presence of CaER effect indicates a susceptible system. Additionally, a method to identify safe and dangerous shocking was established by a hybrid usage of absence or presence of CaER effect and recovery index (RI) curve type. The evaluation of robustness could help determining when adjustment should be really taken to cope with the uncertainty, and thus holds a high promise for field application.
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Affiliation(s)
- Zhi-Hua Li
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
| | - Yuan-Mo Zhu
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Jing Zhang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Cheng-Jian Yang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, Ministry of Education, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
| | - Tian-Yu Zhang
- Department of Mathematical Sciences, Montana State University, Bozeman, MT 59717-2400, USA
| | - Han-Qing Yu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
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112
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Izadifard M, Achari G, Langford CH. Mineralization of sulfolane in aqueous solutions by Ozone/CaO 2 and Ozone/CaO with potential for field application. CHEMOSPHERE 2018; 197:535-540. [PMID: 29407815 DOI: 10.1016/j.chemosphere.2018.01.072] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Revised: 12/05/2017] [Accepted: 01/15/2018] [Indexed: 06/07/2023]
Abstract
Mineralization of sulfolane in aqueous systems by CaO2/O3 and CaO/O3 was investigated in this study. If 1.6 g/L of oxidants (CaO2 and CaO) were used along with 5 L/min of O3 in a batch reactor, degradation of sulfolane followed a pseudo-first order kinetics model. Both sulfolane and TOC were totally removed in less than 40 and 150 min respectively. For these treatments, the pH of the aqueous solutions was above 11, which made O3 more effective in removing sulfolane. However, the high pH of the solution didn't improve TOC removal. For TOC removal the presence of CaO2 and CaO was necessary. Once these conditions were optimised in the lab, field experiments were designed and evaluated to treat contaminated ground water samples. The field tests were successful in mineralization of sulfolane within a reasonable time (4 h). Sulfolane degradation took 150 min in these experiments. The pH of the water samples was brought to near neutral (pH = 6.5) by bubbling CO2.
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Affiliation(s)
- Maryam Izadifard
- Department of Civil Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada.
| | - Gopal Achari
- Department of Civil Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada
| | - Cooper H Langford
- Department of Chemistry, University of Calgary, 2500 University Dr. NW, Calgary, AB, T2N 1N4, Canada
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113
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Xu X, Jia Y, Xiao L, Wu Z. Strong vibration-catalysis of ZnO nanorods for dye wastewater decolorization via piezo-electro-chemical coupling. CHEMOSPHERE 2018; 193:1143-1148. [PMID: 29874742 DOI: 10.1016/j.chemosphere.2017.11.116] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 11/20/2017] [Accepted: 11/21/2017] [Indexed: 05/19/2023]
Abstract
A novel vibration-catalytic performance based on piezo-electro-chemical coupling of zinc oxide (ZnO) nanorods for wastewater decolorization was characterized through the product of piezoelectric performance and electrochemical process. The vibration-catalytic decolorization ratio for acid orange 7 (AO7) solution (5 μM) was up to ∼ 80%. The oxidizing hydroxyl radical (OH) of the intermediates of the vibration-catalytic reactions is observed, indicating the production of piezoelectrically-induced electric charges. The dependence of ZnO addition mass, initial dye concentration and the recycling utilization times of ZnO on dye decolorization ratio were systematically studied. The vibration-catalysis mediated by ZnO, with the advantages of high efficiency and recycling utilization, is potential for dye wastewater decolorization treatment.
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Affiliation(s)
- Xiaoli Xu
- Department of Physics, Zhejiang Normal University, Jinhua 321004, China
| | - Yanmin Jia
- Department of Physics, Zhejiang Normal University, Jinhua 321004, China.
| | - Lingbo Xiao
- Department of Physics, Zhejiang Normal University, Jinhua 321004, China
| | - Zheng Wu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
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114
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Mosmeri H, Alaie E, Shavandi M, Dastgheib SMM, Tasharrofi S. Benzene-contaminated groundwater remediation using calcium peroxide nanoparticles: synthesis and process optimization. ENVIRONMENTAL MONITORING AND ASSESSMENT 2017; 189:452. [PMID: 28808820 DOI: 10.1007/s10661-017-6157-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 08/01/2017] [Indexed: 06/07/2023]
Abstract
Nano-size calcium peroxide (nCaO2) is an appropriate oxygen source which can meet the needs of in situ chemical oxidation (ISCO) for contaminant remediation from groundwater. In the present study, an easy to handle procedure for synthesis of CaO2 nanoparticles has been investigated. Modeling and optimization of synthesis process was performed by application of response surface methodology (RSM) and central composite rotatable design (CCRD) method. Synthesized nanoparticles were characterized by XRD and FESEM techniques. The optimal synthesis conditions were found to be 5:1, 570 rpm and 10 °C for H2O2:CaSO2 ratio, mixing rate and reaction temperature, respectively. Predicted values showed to be in good agreement with experimental results (R 2 values were 0.915 and 0.965 for CaO2 weight and nanoparticle size, respectively). To study the efficiency of synthesized nanoparticles for benzene removal from groundwater, batch experiments were applied in biotic and abiotic (chemical removal) conditions by 100, 200, 400, and 800 mg/L of nanoparticles within 70 days. Results indicated that application of 400 mg/L of CaO2 in biotic condition was able to remediate benzene completely from groundwater after 60 days. Furthermore, comparison of biotic and abiotic experiments showed a great potential of microbial stimulation using CaO2 nanoparticles in benzene remediation from groundwater.
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Affiliation(s)
- Hamid Mosmeri
- Ecology and Environmental Pollution Control Research Group, Environment and Biotechnology Research Division, Research Institute of Petroleum Industry, Tehran, Iran
| | - Ebrahim Alaie
- Environment and Biotechnology Division, Research Institute of Petroleum Industry, Tehran, Iran.
| | - Mahmoud Shavandi
- Ecology and Environmental Pollution Control Research Group, Environment and Biotechnology Research Division, Research Institute of Petroleum Industry, Tehran, Iran
| | - Seyed Mohammad Mehdi Dastgheib
- Microbiology and Biotechnology Group, Environment and Biotechnology Research Division, Research Institute of Petroleum Industry, Tehran, Iran
| | - Saeideh Tasharrofi
- Ecology and Environmental Pollution Control Research Group, Environment and Biotechnology Research Division, Research Institute of Petroleum Industry, Tehran, Iran
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