CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Qiulian Yang,Jian Ke,Haitao Li,Wei Huang,Dong Wang,Yanhua Liu,Jianqiu Chen,Ruixin Guo
Treatment of organic contaminants in waste acid via electrochemical oxidation process has drawn sustained attention. Inspired by the electro-generation of persulfate from homogeneous sulfate (SO 4 2- ) in waste acid and the catalytic activity of heterogeneous tourmaline, this study aimed to investigate the feasibility of in-situ persulfate electro-generation and activation via utilizing homogeneous–heterogeneous hybrid catalysts system (SO 4 2- /tourmaline) for organic contaminants removal in high chemical oxygen demand (COD) sulfate-containing waste acid. p -Aminodiphenylamine (RT-Base) was selected as a model organic contaminant to explore the mechanism of electrolysis/SO 4 2- /tourmaline system. No RT-Base was detected after 60 min reaction in electrolysis/SO 4 2- /tourmaline system. The formation of • OH and SO 4 •− in electrolysis/SO 4 2- /tourmaline system made contributions to the RT-Base degradation. Degradation intermediates of RT-Base were identified and possible degradation pathway was proposed. Additionally, the application of electrolysis/SO 4 2- /tourmaline system in treating the real RT-Base waste acid, which contained high COD and SO 4 2- , was explored. Results showed that the COD removal rate was 67.94% under the optimal conditions, and the electrolysis/SO 4 2- /tourmaline system could enhance the biodegradability of RT-Base waste acid. Furthermore, the electrolysis/SO 4 2- /tourmaline system followed by the activated sludge process achieved a high COD removal efficiency (99.09%). Microbial DNA analysis suggested that Bacteroidetes, Proteobacteria, and Actinobacteria were the dominant bacterial phyla in the activated sludge; and metabolism was the predominant microbial function. In-situ electro-generation of persulfate/SO 4 •− for organics degradation achieved efficient utilization of waste sulfate. Electrochemical oxidation process with activated sludge process as a post-treatment showed great potential in the treatment of organics in high-sulfate waste acid.
研究领域:
环境科学
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化学工程
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电化学
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催化
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废水处理
✓ 已验证
产品关联
DOI
高影响因子
Water
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2023
·Vol. 15
·期 20
·3544
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IF 3.4
Qingnan Sun,Xiaoping Zhang,Xin Zhang
In the treatment of wastewater containing only chemical oxygen demand (COD) byChlorellasp., the cell activity and proliferation ability ofChlorellasp. decreased with the culture time, which affected the removal of COD in wastewater. To solve these problems, theChlorellasp.–natural microorganism symbiosis system was prepared. The system was used to explore how natural microorganisms affect the cell activity and the proliferation ability ofChlorellasp. in wastewater. In the treatment of COD byChlorellasp., the removal rate of COD decreased from 45.47% to 28.88%, with a decrease in the cell activity and proliferation ability ofChlorellasp. In theChlorellasp.–natural microorganism symbiotic system, the removal rate of COD reached 45.75%. With the introduction of natural microorganisms, the circulation of CO2and O2betweenChlorellasp. and natural microorganisms promoted photosynthesis and respiration, which enhanced the cell activity ofChlorellasp. Under the condition that the dosage of natural microorganisms was between 1% and 6%, the concentration ofChlorellasp. was close to the logarithmic growth phase, which maintained the proliferation ability ofChlorellasp. At the same time, the natural microorganisms grew and proliferated in wastewater containing only COD through preying onChlorellasp.Keywords:Chlorellasp.;natural microorganisms;symbiosis system;cell activity;predation
研究领域:
环境生物学
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废水处理
✓ 已验证
产品关联
DOI
高影响因子
Water
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2024
·Vol. 16
·期 24
·3579
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IF 3
Qiujie Qian,Pingzhong Xiao,Tinghui Du,Demin Xu,Chuanshuo Guo,Yue Guan,Minxuan Yan,Feihong Wang,Yonghao Zhang,Yan Li
With the growing demand for high-quality discharge, reverse osmosis (RO) technology has been widely applied in landfill leachate treatment; however, the problem of reverse osmosis concentrates (ROCs) has worsened. In this work, a Ti4O7-nanotube reactive electrochemical membrane (Ti4O7-NT-REM) was employed to treat ROCs from landfill leachate treatment. The effects of current density, flow rate and pH on COD removal were evaluated, and the appropriate conditions were a current density of 20 mA cm−2, a flow rate of 10 mL s−1and a pH of 7. Under these conditions, COD, TOC, NH4+-N and NO3−-N were removed by 82%, 68%, 100% and 73%, respectively. In addition, the 3D-EEM fluorescence spectra and GC–MS results revealed that the organics significantly decreased after 120 min of treatment, and aliphatic compounds were the major organic compounds. The stable performance of the REM was illustrated by cyclic treatment (20 cycles) with the assistance of cathodic polarization. In addition, a long service lifetime of 267.3 h and a low energy consumption of 7.6 kWh·kg COD−1were obtained by related testing and evaluation. The excellent and stable performance confirmed that the Ti4O7-NT-REM has broad application prospects in the treatment of ROCs.
研究领域:
环境科学
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废水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
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2016
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IF 1.613
Jiade Wang,Binxun Hong,Xinyang Tong,Shufeng Qiu
The process of recovering waste sulfuric acids using H2O2 catalytic oxidation is studied in this paper. Activated carbon was used as catalyst. Main operating parameters, such as temperature, feed rate of H2O2, and catalyst dosage, have effects on the removal of impurities from waste sulfuric acids. The reaction kinetics of H2O2 catalytic oxidation on impurities are discussed. At a temperature of 90°C, H2O2 feeding rate of 50 g (kg waste acid)−1 per hour, and catalyst dosage of 0.2 wt% (waste acid weight), the removal efficiencies of COD and chrominance were both more than 99%, the recovery ratio of sulfuric acid was more than 95%, and the utilization ratio of H2O2 was 88.57%.Implications: Waste sulfuric acid is a big environmental problem in China. The amount of waste sulfuric acid is huge every year. Many small and medium-sized businesses produced lots of waste acids, but they don’t have an appropriate method to treat and recover them. H2O2 catalytic oxidation has been used to treat and recover waste sulfuric acid and activated carbon is the catalyst here. Main parameters, such as temperature, feed rate of H2O2, and catalyst dosage, have been investigated. The reaction kinetics are discussed. This method can be economical and feasible for most small and medium-sized businesses.
研究领域:
环境科学
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化学工程
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废物处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
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2024
·
IF 2.8
Tao Li,Chen Gao,Tianlei Yang,Yueping Guan
The oilfield produced water (PW) treated by traditional process difficult to reduce the chemical oxygen demand COD value to below 50 mg/L. In this work, magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar was successfully prepared. The COD value of the PW was reduced from an initial value of 387 mg/L to 37 mg/L in 10 min of low speed mixing using magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar. In addition, the spent magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar can be regenerated by heating at 240 °C for 20 min. The regenerated magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar showed excellent adsorption properties, and the COD value of the PW was reduced to about 35 mg/L in all six recycles.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
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2023
·
IF 2
Jian Lin,Jiawen Yin,Wanlei Gao,Qinghui Jin
Chemical oxygen demand (COD) is an important indicator of the degree of organic pollution in water. However, the development of integrated and batch COD electrochemical sensors has always been challenging. In this study, a three-electrode integrated electrochemical sensor for the measurement of COD in surface water was evaluated. Using microfabrication with a microelectromechanical system (MEMS), the sensor was mass-produced and integrated with boron-doped diamond (BDD), Pt, and Ag/AgCl electrodes on the chip. The determination of glucose in optimal conditions provided a linear range from 5 to 200 mg L−1, a detection limit of 3.899 mg L−1, and satisfactory linearity (R2) of 0.998. As the sensor was fabricated by MEMS technology, good reproducibility was experimentally verified with relative standard deviations less than 4%, which suggests mass production of the sensor. The sensor was calibrated to be relatively stable in the presence of Cl− and NO2−. A low-cost, miniature (6 mm2), and stable COD sensor was designed using microfabrication technology that may be mass-produced to build a water quality detection network in the Internet of Things era.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
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2023
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IF 8.8
Xianhua Ji,Huiyu Liang,Sukai Hu,Bo Yang,Ke Xiao,Gang Yu
A novel CuO–CeO 2 –Co 3 O 4 nanocatalyst loaded on Al 2 O 3 ceramic composite membrane (CCM-S) was synthesized through spraying-calcination method, which can be beneficial to the engineering application of scattered granular catalyst. BET and FESEM-EDX testing revealed that CCM-S possessed a porous character with high BET surface area of 22.4 m 2 /g and flat modified surface with extremely fine particle aggregation. The CCM-S calcined above 500 °C presented excellent anti-dissolution effect due to the formation of crystals. XPS indicated that the composite nanocatalyst possessed the variable valence states, which were conducive to exert the catalytic effect of Fenton-like reaction. Subsequently, the effects of experimental parameters including fabricate method, calcination temperature, H 2 O 2 dosage, initial pH value, and CCM-S amount were further investigated considering the removal efficiency of Ni(II)-complex and COD after decomplexation and precipitation (pH = 10.5) treatment within 90 min. Under the optimal reaction condition, the residual Ni(II)-complex and Cu(II)-complex concentration from actual wastewater was all lower than 0.18 mg/L and 0.27 mg/L, respectively; meanwhile, the removal efficiency of COD was all higher than 50% in the mixed electroless plating effluent. Besides, the CCM-S could still maintain high catalytic activity after a six-cycle test, and the removal efficiency was slightly declined from 99.82% to 88.11%. These outcomes indicated that CCM-S/H 2 O 2 system was provided with a potential applicability on treatment of real chelated metal wastewater.
研究领域:
环境工程
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材料科学
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废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
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IF 2.587
Yujia Xie,Fengyong Zhang,Pingle Liu,Fang Hao,Hean Luo
Direct functionalization of saturated C–H bonds by metalloporphyrin catalysts is among the topical and challenging areas within the chemical industry and synthetic chemistry. In this work, supported CoD(p-Cl)PPCl metalloporphyrin catalysts were prepared and characterized. It has been found that the CoD(p-Cl)PPCl/ZnO catalyst shows better catalytic activity than the supported catalyst (ZrO2, MCM-41, kaolin, Zr(OH)2, and boehmite (BM)) in cyclohexane oxidation with dioxygen. The effects of the reaction pressure, reaction temperature, and reaction time on the catalytic activity were considered by the supported CoD(p-Cl)PPCl/ZnO catalyst. The CoD(p-Cl)PPCl/ZnO catalyst can be facilely recovered and was recycled up to seven times without a significant decrease in catalytic performance. The average cyclohexane conversion and selectivity to KA oil are 10.98% and 84.34%, respectively, and the turnover number is 2.10 × 107.
研究领域:
催化化学
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有机合成
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工业化学
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材料化学
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绿色化学
✓ 已验证
DOI
高影响因子
Green Chemical Engineering
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2024
·
IF 9.1
Enze Li,Jing Dong,Yongsheng Jia,Zihe Pan,Hongzhou Lv,Zhiping Du,Guandao Gao,Fangqin Cheng
Sufficient treatment of industrial organic wastewater with high salt and large amounts of suspended particulate matter remains a challenge worldwide. In this work, a novel coagulation-flotation combined process was developed to treat the suspended particles as well as significantly reduce organic pollutants content in the actual high-salt organic wastewater. Four typical inorganic and organic flocculants (poly aluminum chloride (PAC), poly ferric sulfate (PFS), polyacrylamide (PAM), and modified cationic starch (CS)) were selected for compounding to obtain an optimized flocculation system for high-salt wastewater. The results showed that the PAC-PAM with a 10:1 ratio in mass exhibited the best coagulation behaviors with the removal efficiency of turbidity and chemical oxygen demand (COD) being 95.33% and 9.21%, respectively, under the optimal operation conditions, and the sedimentation process of coagulant conformed to the quasi-second-order kinetics. The PAC-PAM flocs exhibited stronger netting, sweeping, and adsorption bridging capabilities, which were conducive to removing suspended particles. When the flotation was conducted after coagulation, the COD decreased significantly by 20.82%. In addition, this combined process could reduce the treatment time by 50% compared to the process with only coagulation treatment. During the flotation process, floc particles companies with hydrophobic polycyclic aromatic hydrocarbons could collide and adhere to microbubbles and be floated to the surface, resulting in an effective reduction of COD. This work could provide a novel strategy and step forward to design and optimize the pretreatment process engineering for organic high-salt wastewater.
研究领域:
环境工程
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废水处理
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Mingwei Wang,Ye Sun,Qilin Yu,Zhiqiang Zhao,Yang Li,Yaobin Zhang
Fenton sludge generated in the flocculation stage of the Fenton oxidation process contains significant amounts of ferric iron and organic pollutants , which require proper treatment. Previous studies have demonstrated that adding Fenton sludge to an anaerobic digester can decompose some of the organic pollutants in the Fenton sludge to lower its environmental risk, but iron gradually accumulates in the reactor, which weakens the sustainability of the method. In this study, Fenton sludge was introduced into a hydrolytic acidification reactor with a weak acid environment to relieve the iron accumulation as well as improve the degradation of organic matter. The results showed that the added Fenton sludge acted as an extracellular electron acceptor to induce dissimilatory iron reduction, which increased chemical oxygen demand (COD) removal and acidification efficiency by 16.1% and 19.8%, respectively, compared to the group without Fenton sludge. Along with the operation, more than 90% of the Fe(III) in Fenton sludge was reduced to Fe(II), and part of them was released to the effluent. Moreover, the Fe(II) in the effluent could be used as flocculants and Fenton reagents to further decrease the effluent COD by 29.8% and 44.5%, respectively. It provided a sustainable strategy to reuse Fenton sludge to enhance organic degradation based on the iron cycle.
研究领域:
环境工程
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废物管理
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水处理
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
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2022
·
IF 3.475
Chun-Feng Wang,Yue-Yi Li,Ai-Hong Li,Nan Yang,Xiao-Wen Wang,Yin-Ming Li,Ye Zhang
In this study, the significant iron-based material, hydroxyl-functionalized ball-milled zero-valent iron/Fe3O4 (HFB-ZVI/Fe3O4) was employed for the experiments. The performance of the Electro + HFB-ZVI/Fe3O4 + Oxone system for the degradation of chemical oxygen demand (COD) in antibiotic wastewater was investigated. A direct current was applied between a graphite plate anode and two iron plate cathodes, and a series of operational parameters, such as applied electric current, the dosage of HFB-ZVI/Fe3O4 composite, the dosage of Oxone, and initial solution pH, were explored to evaluate the oxidation process. The application of electric current enhanced the gradual degradation of COD and the increase of current intensity accelerated COD degradation. The neutral condition was favourable for the rapid degradation of COD in a short reaction time by the Electro + HFB-ZVI/Fe3O4 + Oxone process and promoted the degradation efficiency of COD. An increase of electric current gradually decreased the reaction solution pH, the larger the electric current applied in the reaction process, the lower the final pH of the reaction solution. Under the optimal experimental conditions (1 g/L HFB-ZVI/Fe3O4 composite, 0.3 g/L Oxone, current intensity = 500 mA, initial solution pH = 7.85), Electro + HFB-ZVI/Fe3O4 + Oxone achieved 99% COD degradation in antibiotic wastewater. Radicals quenching experiments indicated the contribution to COD degradation by hydroxyl radicals (HO•), sulphate radicals (SO4•–) and other oxidants were 66.03%, 24.014% and 9.756%, respectively. The possible mechanism of COD degradation in the Electro + HFB-ZVI/Fe3O4 + Oxone system was also discussed in this study. The findings in this work provided useful information for the treatment of wastewater.
研究领域:
环境科学
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水处理工程
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
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2020
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IF 4.762
Jiayao Li,Weifeng Song,Zefeng Yu,Qiuhua Li
The quality of dairy farming wastewater in different regions is particular and different. In Southern China, the Chemical Oxygen Demand (COD Cr ) and colourity of effluent from conventional dairy farming wastewater treatment processes are similar. Catalytic ozonation is a very promising technical method. In this paper, the Mn-Fe-Ce/γ-Al 2 O 3 catalyst was prepared via the optimized preparation method of impregnation roasting using γ-Al 2 O 3 as the carrier, and this catalyst was used in the ozonation of actual dairy farming wastewater from treatment facilities. The performance of the Mn-Fe-Ce/γ-Al 2 O 3 catalyst on dairy farming wastewater was investigated using a simulated dynamic test. The effects of the reaction time, pH and catalyst dosage on COD Cr and the colourity removal ratio were investigated. The results show that the optimum treatment conditions were a reaction time of 20 min, pH 9, and catalyst dosage of 15 g/L. The COD Cr removal ratio reached 48.9% and the colourity was 95% under the optimum conditions. BOD 5 /COD Cr increased from 0.21 to 0.54 after catalytic ozonation, indicating that the biodegradability of wastewater was significantly improved. This research provides a new method and theoretical guidance for dairy farming wastewater treatment.
研究领域:
环境工程
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废水处理
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催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）