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An internal circulation iron-carbon micro-electrolysis reactor for aniline wastewater treatment:Parameter optimization,degradation pathways and mechanism 被引量:1
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作者 Yanhe Han Han Xu +4 位作者 Lei Zhang Xuejiao Ma Yang Man Zhimin Su Jing Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2023年第11期96-107,共12页
Aniline is a vital industrial raw material.However,highly-toxic aniline wastewater usually deteriorated effluent quality,posed a threat to human health and ecosystem safety.Therefore,this study reported a novel intern... Aniline is a vital industrial raw material.However,highly-toxic aniline wastewater usually deteriorated effluent quality,posed a threat to human health and ecosystem safety.Therefore,this study reported a novel internal circulation iron-carbon micro-electrolysis(ICE)reactor to treat aniline wastewater.The effects of reaction time,pH,aeration rate and iron-carbon(Fe/C)ratio on the removal rate of aniline and the chemical oxygen demand were investigated using single-factor experiments.This process exhibited high aniline degradation performance of approximately 99.86% under optimal operating conditions(reaction time=20 min,pH=3,aeration rate=0.5 m3·h^(-1),and Fe/C=1:2).Based on the experimental results,the response surface method was applied to optimize the aniline removal rate.The Box–Behnken method was used to obtain the interaction effects of three main factors.The result showed that the reaction time had a dominant effect on the removal rate of aniline.The highest aniline removal rate was obtained at pH of 2,aeration rate of 0.5 m^(3)·h^(-1)and reaction time of 30 min.Under optional experimental conditions,the aniline content of effluent was reduced to 3 mg·L^(-1)and the removal rate was as high as 98.24%,within the 95% confidence interval(97.84%-99.32%)of the predicted values.The solution was treated and the reaction intermediates were identified by high-performance liquid chromatography,ultraviolet-visible spectroscopy,Fourier-transform infrared spectroscopy,gas chromatography-mass spectrometry,and ion chromatography.The main intermediates were phenol,benzoquinone,and carboxylic acid.These were used to propose the potential mechanism of aniline degradation in the ICE reactor.The results obtained in this study provide optimized conditions for the treatment of industrial wastewater containing aniline and can strengthen the understanding of the degradation mechanism of iron-carbon micro-electrolysis. 展开更多
关键词 ANILINE Iron-carbon micro-electrolysis Circulating fluidized bed Waste water DEGRADATION
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Treatment of naphthalene derivatives with iron-carbon micro-electrolysis 被引量:20
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作者 王玉萍 王连军 +1 位作者 彭盘英 陆天虹 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2006年第6期1442-1447,共6页
The degradation of five naphthalene derivatives in the simulated wastewater was investigated using the iron-carbon micro-electrolysis method.The optimal initial pH of solution and adsorption of iron-carbon and removal... The degradation of five naphthalene derivatives in the simulated wastewater was investigated using the iron-carbon micro-electrolysis method.The optimal initial pH of solution and adsorption of iron-carbon and removal efficiency of the total organic carbon(TOC)were investigated.The results show that the removal efficiency of the naphthalene derivatives can reach 48.9%?92.6% and the removal efficiency of TOC is 42.8%?78.0% for the simulated wastewater with 200 mg/L naphthalene derivatives at optimal pH of 2.0?2.5 after 120 min treatment.The degradation of five naphthalene derivatives with the micro-electrolysis shows the apparent first-order kinetics and the order of removal efficiency of the naphthalene derivatives is sodium 2-naphthalenesulfonate,2-naphthol,2,7-dihydroxynaphthalene,1-naphthamine,1-naphthol-8-sulfonic acid in turn.It is illustrated that the substituents of the naphthalene ring can affect the removal efficiency of naphthalene due to their electron-withdrawing or electron-donating ability. 展开更多
关键词 cast iron SCRAP micro-electrolysis NAPHTHALENE SUBSTITUENT WASTEWATER TREATMENT
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Nitrogen removal efficiency of iron-carbon micro-electrolysis system treating high nitrate nitrogen organic pharmaceutical wastewater 被引量:4
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作者 周健 段送华 +1 位作者 陈垚 胡斌 《Journal of Central South University》 SCIE EI CAS 2009年第S1期368-373,共6页
The nitrate nitrogen removal efficiency of iron-carbon micro-electrolysis system was discussed in treating pharmaceutical wastewater with high nitrogen and refractory organic concentration. The results show that the g... The nitrate nitrogen removal efficiency of iron-carbon micro-electrolysis system was discussed in treating pharmaceutical wastewater with high nitrogen and refractory organic concentration. The results show that the granularity of fillings,pH,volume ratios of iron-carbon and gas-water,and HRT. have significant effects on the nitrogen removal efficiency of iron-carbon micro-electrolysis system. The iron-carbon micro-electrolysis system has a good removal efficiency of pharmaceutical wastewater with high nitrogen and refractory organic concentration when the influent TN,NH4+-N,NO3--N and BOD5/CODCr are 823 mg/L,30 mg/L,793 mg/L and 0.1,respectively,at the granularity of iron and carbon 0.425 mm,pH 3,iron-carbon ratio 3,gas-water ratio 5,HRT 1.5 h,and the removal rates of TN,NH4+-N and NO3--N achieve 51.5%,70% and 50.94%,respectively. 展开更多
关键词 Iron-carbon micro-electrolysis NITROGEN NITRATE NITROGEN REMOVAL efficiency REMOVAL rate
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Effect of Micro-electrolysis and Micro-nano Bubbles Coupled with Peroxymonosulfate Treatment of Rural Domestic Sewage
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作者 Peng ZHOU Yixin XU +3 位作者 Dongmei CHEN Cheng WU Xiaosi LEI Li FENG 《Meteorological and Environmental Research》 2024年第4期54-57,共4页
With the continuous deepening of rural revitalization strategy and the increasingly strict sewage discharge standards,rural domestic sewage treatment technology is facing higher challenges and requirements.The combine... With the continuous deepening of rural revitalization strategy and the increasingly strict sewage discharge standards,rural domestic sewage treatment technology is facing higher challenges and requirements.The combined process of micro-electrolysis+micro-nano bubbles coupled with peroxymonosulfate was constructed in this study,and the treatment effect and application value of this technology were explored with the actual rural domestic sewage as the treatment object.The experimental results showed that under the conditions of HRT of 120 min,PMS dosage of 0.15 mmol/L,pH=7,MBs air intake of 15 ml/min,current intensity of 15 A,and Fe/C mass ratio of 1:1,the removal rates of COD,ammonia nitrogen and total phosphorus can reach 88.55%,77.18%and 74.67%,respectively.Under the condition that the pH value of sewage was not adjusted,the non-biochemical simultaneous decarbonization,denitrification and phosphorus removal of rural domestic sewage can be achieved by micro-electrolysis and micro-nano bubbles coupled with peroxymonosulfate.The concentrations of effluent COD,ammonia nitrogen and total phosphorus met the requirements of the first level standard of the Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities(DB45T2413-2021).And the comprehensive operating cost was about 1.15 yuan/m 3. 展开更多
关键词 Integrated equipment Rural domestic sewage Micro-nano bubbles PEROXYMONOSULFATE micro-electrolysis
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Reutilize tire in microbial fuel cell for enhancing the nitrogen removal of the anammox process coupled with iron-carbon micro-electrolysis 被引量:4
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作者 Fei Xie Bowei Zhao +3 位作者 Ying Cui Xiao Ma Xiao Zhang Xiuping Yue 《Frontiers of Environmental Science & Engineering》 SCIE EI CSCD 2021年第6期319-330,共12页
In this study,microbial fuel cells(MFCs)were explored to promote the nitrogen removal performance of combined anaerobic ammonium oxidation(anammox)and Fe-C micro-electrolysis(CAE)systems.The average total nitrogen(TN)... In this study,microbial fuel cells(MFCs)were explored to promote the nitrogen removal performance of combined anaerobic ammonium oxidation(anammox)and Fe-C micro-electrolysis(CAE)systems.The average total nitrogen(TN)removal efficiency of the modified MFC system was 85.00%,while that of the anammox system was 62.16%.Additionally,the effective operation time of this system increased from six(CAE system alone)to over 50 days,significantly promoting TN removal.The enhanced performance could be attributed to the electron transferred from the anode to the cathode,which aided in reducing nitrate/nitrite in denitrification.The H+released through the proton exchange membrane caused a decrease in the pH,facilitating Fe corrosion.The pyrolyzed waste tire used as the cathode could immobilize microorganisms,enhance electron transport,and produce a natural Fe-C micro-electrolysis system.According to the microbial community analysis,Candidatus kuenenia was the major genus involved in the anammox process.Furthermore,the SM1A02 genus exhibited the highest abundance and was enriched the fastest,and could be a novel potential strain that aids the anammox process. 展开更多
关键词 Waste tire MFCs micro-electrolysis ANAMMOX Feammox
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High-gravity intensified iron-carbon micro-electrolysis for degradation of dinitrotoluene 被引量:1
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作者 Jiaxin Jing Weizhou Jiao +4 位作者 Zhixing Li Kechang Gao Jingwen Zhang Gaomiao Ren Youzhi Liu 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2022年第11期1595-1605,共11页
The application of iron–carbon(Fe–C)micro-electrolysis to wastewater treatment is limited by the passivation potential of the Fe–C packing.In order to address this problem,high-gravity intensified Fe–C micro-elect... The application of iron–carbon(Fe–C)micro-electrolysis to wastewater treatment is limited by the passivation potential of the Fe–C packing.In order to address this problem,high-gravity intensified Fe–C micro-electrolysis was proposed in this study for degradation of dinitrotoluene wastewater in a rotating packed bed(RPB)using commercial Fe–C particles as the packing.The effects of reaction time,high-gravity factor,liquid flow rate and initial solution pH were investigated.The degradation intermediates were determined by gas chromatography-mass spectrometry,and the possible degradation pathways of nitro compounds by Fe–C micro-electrolysis in RPB were also proposed.It is found that under optimal conditions,the removal rate of nitro compounds reaches 68.4%at 100 min.The removal rate is maintained at approximately 68%after 4 cycles in RPB,but it is decreased substantially from 57.9%to 36.8%in a stirred tank reactor.This is because RPB can increase the specific surface area and the renewal of the liquid–solid interface,and as a result the degradation efficiency of Fe–C micro-electrolysis is improved and the active sites on the Fe–C surface can be regenerated for continuous use.In conclusion,high-gravity intensified Fe–C micro-electrolysis can weaken the passivation of Fe–C particles and extend their service life. 展开更多
关键词 high-gravity technology rotating packed bed Fe–C micro-electrolysis dinitrotoluene wastewater active sites
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Degradation of organic wastewater containing Cu-EDTA by Fe-C micro-electrolysis 被引量:19
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作者 陈润华 柴立元 +3 位作者 王云燕 刘恢 舒余德 赵静 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第4期983-990,共8页
In order to break the complex bonds and treat the organic wastewater containing heavy metal,such as Cu-EDTA solution,a novel process of Fe-C micro-electrolysis was proposed.Based on the principle of iron-carbon micro-... In order to break the complex bonds and treat the organic wastewater containing heavy metal,such as Cu-EDTA solution,a novel process of Fe-C micro-electrolysis was proposed.Based on the principle of iron-carbon micro-electrolysis reaction,-OH radicals which were generated under the acidic aerobic condition during the micro-electrolysis process attacked to the organic groups of coordination compounds,which resulted in complex bonds breaking.Therefore copper(Ⅱ) ions were removed via nascent gelatinous ferric hydroxide and ferrous hydroxide,and EDTA was degraded by-OH radicals.Effects of pH value,temperature,electrolysis time and mass ratio of Fe to C on residual concentrations of total organic carbon(TOC) and Cu(Ⅱ) were studied.The mechanism of Fe-C micro-electrolysis was investigated and verified by analyzing micrographs of scanning electron microscopy(SEM),energy dispersive analysis(EDS) and Fourier transform infrared spectrometry(FTIR).The removal efficiency is optimal at pH value of 2.0,temperature of 25 °C,the mass ratio Fe to C of 0.02,and reaction time of 60 min.Under above conditions,the concentration of TOC decreases from 200 mg/L to 40.66 mg/L and the residual concentration of Cu(Ⅱ) decreases from initial 60 mg/L to 1.718 mg/L. 展开更多
关键词 micro-electrolysis -OH radical EDTA WASTEWATER
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Micro-electrolysis technology for industrial wastewater treatment 被引量:37
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作者 JIN Yi-zhong , ZHANG Yue-feng, LI Wei (Department of Environmental Engineering, Zhejiang University, Hangzhou 310027, China.) 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2003年第3期334-338,共5页
Experiments were conducted to study the role of micro-electrolysis in removing chromaticity and COD and improving the biodegradability of wastewater from pharmaceutical, dye-printing and papermaking plants. Results sh... Experiments were conducted to study the role of micro-electrolysis in removing chromaticity and COD and improving the biodegradability of wastewater from pharmaceutical, dye-printing and papermaking plants. Results showed that the use of micro-electrolysis technology could remove more than 90% of chromaticity and more than 50% of COD and greatly improved the biodegradability of pharmaceutical wastewater. Lower initial pH could be advantageous to the removal of chromaticity. A retention time of 30 minutes was recommended for the process design of micro-electrolysis. For the use of micro-electrolysis in treatment of dye-printing wastewater, the removal rates of both chromaticity and COD were increased from neutral condition to acid condition for disperse blue wastewater; more than 90% of chromaticity and more than 50% of COD could be removed in neutral condition for vital red wastewater. 展开更多
关键词 micro-electrolysis pharmaceutical wastewater dye-printing wastewater papermaking wastewater COD removal chromaticity removal
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Experimental study on micro-electrolysis technology for pharmaceutical wastewater treatment 被引量:24
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作者 金一中 张月锋 李伟 《Journal of Zhejiang University Science》 CSCD 2002年第4期401-404,共4页
Experiments were conducted to study the role of micro-electrolysis in removing chromaticity and COD and improving the biodegradability of pharmaceutical wastewater. The results showed that the use of micro-electrolysi... Experiments were conducted to study the role of micro-electrolysis in removing chromaticity and COD and improving the biodegradability of pharmaceutical wastewater. The results showed that the use of micro-electrolysis technology could remove more than 90% of chromaticity and more than 50% of COD and greatly improved the biodegradability of pharmaceutical wastewater. Lower initial pH could be advantageous to the removal of chromaticity. A retention time of 30 minutes was recommended for the process design of micro-electrolysis. 展开更多
关键词 micro-electrolysis Pharmaceutical wastewater CHROMATICITY BIODEGRADABILITY Enviromental engineering
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Treatment of chitin-producing wastewater by micro-electrolysis-contact oxidization 被引量:13
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作者 杨岳平 徐新华 陈海峰 《Journal of Zhejiang University Science》 EI CSCD 2004年第4期436-440,共5页
The technique of micro-electrolysis-contact oxidization was exploited to treat chitin-producing wastewater. Results showed that Fe-C micro-electrolysis can remove about 30% CODcr, raise pH from 0.7 to 5.5. The CODcr r... The technique of micro-electrolysis-contact oxidization was exploited to treat chitin-producing wastewater. Results showed that Fe-C micro-electrolysis can remove about 30% CODcr, raise pH from 0.7 to 5.5. The CODcr removal efficiency by biochemical process can be more than 80%. During a half year抯 operation, the whole system worked very stably and had good results, as proved by the fact that every quality indicator of effluent met the expected discharge stan-dards; which means that chitin wastewater can be treated by the technique of micro-electrolysis, contact oxidization. 展开更多
关键词 Chitin-producing wastewater Wastewater treatment micro-electrolysis Contact oxidization
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Optimization of the N2 generation selectivity in aqueous nitrate reduction using internal circulation micro-electrolysis 被引量:5
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作者 Zhijuan Niu Sitao Zhang +1 位作者 Yanhe Han Mengmeng Qi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第12期3010-3016,共7页
The reduction of nitrate using internal circulation micro-electrolysis te chnology(ICE)was investigated.The effect of the reaction time,initial pH,Fe/C ratio,and aeration rate on the nitrate reduction was investigated... The reduction of nitrate using internal circulation micro-electrolysis te chnology(ICE)was investigated.The effect of the reaction time,initial pH,Fe/C ratio,and aeration rate on the nitrate reduction was investigated using a single factor experiment.Based on the results of the single factor experiment,a response surface methodology(RSM)was applied to optimize the N2 generation selectivity.The effects and interactions of three independent variables were estimated using a Box-Behnken design.Using the RSM analysis,a quadratic polynomial model with optimal conditions at pH=8.8,Fe/C=1:1,and an aeration rate of 30 L·min-1 was developed by means of the regre ssion analysis of the experimental data.Using the RSM optimization,the optimal conditions yielded a N2 generation selectivity of 72.0%,which is in good agreement with experimental result(73.2%±0.5%)and falls within the 95%confidence interval(IC:66.8%-77.3%)of the model results.This indicates that the model obtained in this study effectively predicts the N2 generation selectivity for nitrate reduction by the ICE process,thus providing a theoretical basis for process design. 展开更多
关键词 NITRATE reduction Internal CIRCULATION micro-electrolysis Response surface methodology N2
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Structural parameter optimization for novel internal-loop iron–carbon micro-electrolysis reactors using computational fluid dynamics 被引量:4
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作者 Lei Zhang Mengyu Wu +2 位作者 Yanhe Han Meili Liu Junfeng Niu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第4期737-744,共8页
It is generally recognized that internal-loop reactors are well-developed mass and heat-transfer multiphase flow reactors. However, the internal flow field in the internal-loop reactor is influenced by the structure p... It is generally recognized that internal-loop reactors are well-developed mass and heat-transfer multiphase flow reactors. However, the internal flow field in the internal-loop reactor is influenced by the structure parameter of the reactor, which has a great effect on the reaction efficiency. In this study, the computational fluid dynamics simulation method was used to determine the influence of reactor structure on flow field, and a volume-offluid model was employed to simulate the gas–liquid, two-phase flow of the internal-loop micro-electrolysis reactor. Hydrodynamic factors were optimized when the height-to-diameter ratio was 4:1, diameter ratio was9:1, draft-tube axial height was 90 mm. Three-dimensional simulations for the water distributor were carried out, and the results suggested that the optimal conditions are as follows: the number of water distribution pipes was four, and an inhomogeneous water distribution was used. According to the results of the simulation,the suitable structure can be used to achieve good fluid mechanical properties, such as the good liquid circulation velocity and gas holdup, which provides a good theoretical foundation for the application of the reactor. 展开更多
关键词 Iron–carbon micro-electrolysis INTERNAL CYCLING Computational fluid dynamics Structure design
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Degradation of Nitrobenzene Wastewater via Iron/Carbon Micro-electrolysis Enhanced by Ultrasound Coupled with Hydrogen Peroxide 被引量:3
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作者 Qin Yuejiao Yu Lisheng +2 位作者 Luo Shuai Jiao Weizhou Liu Youzhi 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2017年第4期72-81,共10页
The zero valent iron/granular active carbon(ZVI/GAC) micro-electrolysis enhanced by ultrasound(US) coupled with hydrogen peroxide(H_2O_2) was investigated for the deep degradation of nitrobenzene-containing wastewater... The zero valent iron/granular active carbon(ZVI/GAC) micro-electrolysis enhanced by ultrasound(US) coupled with hydrogen peroxide(H_2O_2) was investigated for the deep degradation of nitrobenzene-containing wastewater. The results of scanning electron microscopy-energy dispersive X-rays analysis(SEM-EDS) demonstrated that continuously accelerated regeneration of ZVI and GAC in situ by US could improve the process for converting nitrobenzene(NB) to aniline(AN). H_2O_2 was decomposed catalytically by the byproduct Fe^(2+) ions generated in the micro-electrolysis process to hydroxyl radicals and the organic pollutants in the wastewater were finally mineralized to CO2 and H2O. Effects of the ZVI dosage, the ZVI/GAC mass ratio, the initial pH value and the H_2O_2 dosage on the efficiency for degradation of NB were studied in these experiments. The optimal operating conditions covered a ZVI dosage of 15 g/L, a ZVI/GAC mass ratio of 1:2,an initial pH value of 3 and a H_2O_2 dosage of 4 mL. In this case, the NB removal efficiency reached 97.72% and the total organic carbon(TOC) removal efficiency reached 73.42% at a NB concentration of 300 mg/L. The reduction of NB by USZVI/GAC followed the pseudo-first-order kinetics model, and the pseudo-first-order rate constants were given at different initial pH values. The reaction intermediates such as AN, benzoquinonimine, p-benzoquinone, p-nitrophenol and other organic acids were detected and a probable pathway for NB degradation has been proposed. 展开更多
关键词 iron/carbon micro-electrolysis ULTRASOUND hydrogen peroxide NITROBENZENE wastewater treatment DEGRADATION mechanisms
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Effective removal of Sb(V)from aqueous solutions by micro-electrolysis with composite scrap iron-manganese as filler
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作者 Shangkun DING Saihua HUANG +1 位作者 Yiping ZHANG Yongchao ZHOU 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2024年第6期516-524,共9页
Micro-electrolysis(ME)technology is investigated for improving the efficiency of removal of pentavalent antimony(Sb(V))from the environment.In this study,an ME system composed of scrap iron filings,waste manganese fil... Micro-electrolysis(ME)technology is investigated for improving the efficiency of removal of pentavalent antimony(Sb(V))from the environment.In this study,an ME system composed of scrap iron filings,waste manganese fillings,and activated carbon(Fe-Mn-C ME)was used to efficiently remove Sb(V).The results proved that,compared with conventional iron-carbon micro-electrolysis(Fe-C ME),Fe-Mn-C ME significantly enhances the removal rate of Sb(V)when the hydraulic retention time is 10–24 h.The Fe-Mn flocs produced by this system were analyzed using X-ray diffraction(XRD),energy-dispersive X-ray spectroscopy(EDS),X-ray photoelectron spectroscopy(XPS),and Brunauer-Emmett-Teller(BET)surface area analysis,which revealed that the flocs were mostly Mn-substituted FeOOH and had a relatively larger specific surface area,providing better adsorption performance.Furthermore,it was found that the removal rate of Sb(V)decreased as the iron-carbon mass ratio increased,while it first increased and then decreased as the manganese content increased.The reduction of Fe(III)was accelerated with an increase in the addition of manganese,leading to an increase in the concentration of Fe(II).The electron transfer and the formation of Fe(II)were facilitated by the potential difference between manganese and carbon,as well as by the formation of microcells between iron and manganese,which improved the reduction ability of Sb(V).From our thorough investigation and research,this is the first report that has proposed Fe-Mn-C ME for removing antimony.It provides a novel approach and technological support for removing Sb(V)efficiently. 展开更多
关键词 ANTIMONY Iron MANGANESE micro-electrolysis(ME) ELECTROCHEMISTRY Mechanism
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Treatment of Wastewater from Pharmaceutical Intermittent Production by Fe/C-Fenton-Hydrolysis Acidification-A/O Process 被引量:1
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作者 Zhai Jian Jiang Chunhua +2 位作者 Wang Ya Zhang Jingjing Wang Yina 《Meteorological and Environmental Research》 CAS 2018年第1期71-74,82,共5页
The design and running effect of treatment of wastewater from pharmaceutical intermittent production by iron-carbon(Fe/C)-Fentonhydrolysis acidification-anoxic/aerobic(A/O)process were introduced.The results of co... The design and running effect of treatment of wastewater from pharmaceutical intermittent production by iron-carbon(Fe/C)-Fentonhydrolysis acidification-anoxic/aerobic(A/O)process were introduced.The results of continuous operation showed that when the flow rate of the influent wastewater was 300 m^3/d,after the influent high-concentration wastewater(CODCrand NH4+-N concentration were 35 000 and 1 000 mg/L,respectively)and medium-concentration wastewater(CODCrand NH4+-N concentration were 1 500 and 100 mg/L,respectively)were treated by the process,CODCrand NH4+-N concentration in the effluent decreased to 360-410 and 20-25 mg/L,respectively,and the quality of the effluent could meet the Grade III standard of Integrated Wastewater Discharge Standard(GB 8978-1996).The combined process was proved to be an effective method to treat wastewater from pharmaceutical intermittent production,and its operation was stable. 展开更多
关键词 Iron-carbon micro-electrolysis Fenton reagent Hydrolysis acidification Anoxic/aerobic Wastewater from pharmaceutical intermittentproduction
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Treatment of oilfield produced water by anaerobic process coupled with micro-electrolysis 被引量:24
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作者 Gang Li Shuhai Guo Fengmei Li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2010年第12期1875-1882,共8页
Treatment of oilfield produced water was investigated using an anaerobic process coupled with micro-electrolysis (ME), focusing on changes in chemical oxygen demand (COD) and biodegradability. Results showed that ... Treatment of oilfield produced water was investigated using an anaerobic process coupled with micro-electrolysis (ME), focusing on changes in chemical oxygen demand (COD) and biodegradability. Results showed that COD exhibited an abnormal change in the single anaerobic system in which it increased within the first 168 hr, but then decreased to 222 mg/L after 360 hr. The biological oxygen demand (five-day) (BOD5)/COD ratio of the water increased from 0.05 to 0.15. Hydrocarbons in the wastewater, such as pectin, degraded to small molecules during the hydrolytic acidification process. Comparatively, the effect of ME was also investigated. The COD underwent a slight decrease and the BOD5/COD ratio of the water improved from 0,05 to 0.17 after ME. Removal of COD was 38.3% under the idealized ME conditions (pH 6.0), using iron and active carbon (80 and 40 g/L, respectively). Coupling the anaerobic process with ME accelerated the COD removal ratio (average removal was 53.3%). Gas chromatography/mass spectrometry was used to analyze organic species conversion. This integrated system appeared to be a useful option for the treatment of water produced in oilfields. 展开更多
关键词 heavy oil produced water anaerobic system micro-electrolysis BIODEGRADABILITY
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Reduced graphene oxide-nano zero value iron(rGO-nZVI) micro-electrolysis accelerating Cr(Ⅵ) removal in aquifer 被引量:13
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作者 Liming Ren Jun Dong +1 位作者 Zifang Chi Huazheng Huang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第11期96-106,共11页
Nanoscale zero-valent iron (nZVI) assembled on graphene oxide (GO) (rGO-nZVI) composites were synthesized by reduction of GO and ferrous ions with potassium borohydride, for use in Cr(VI) removal from aqueous ... Nanoscale zero-valent iron (nZVI) assembled on graphene oxide (GO) (rGO-nZVI) composites were synthesized by reduction of GO and ferrous ions with potassium borohydride, for use in Cr(VI) removal from aqueous solution. The results showed that the two-dimensional structure of GO could provide a skeleton support for Fe0, thus overcoming the bottleneck of aggregation for nZVI. Also, rGO-nZVI would form a ferric-carbon micro-electrolysis system in Cr(VI)-contaminated aquifers, enhancing and accelerating electron transfer, exhibiting high rate and capacity for Cr(VI) removal. The optimum dosage of the applied rGO-nZVI was linearly correlated with the initial Cr(VI) concentration. Characterization of rGO-nZVI before and after reaction with Cr(VI) revealed the process of Cr(VI) removal: rGO-nZVI firstly transferred electrons from Fe0 cores via their Fe(II)/Fe(III) shells to the GO sheet; there, negatively charged Cr(VI) received electrons and changed into positively charged Cr(III), which was adsorbed by the negatively charged GO sheet, avoiding the capping and passivating of nZVI rGO-nZVI formed a good electrically conductive network, and thus had long-term electron releasing properties, which was important for groundwater remediation. 展开更多
关键词 Reduced graphene oxide-nano zero value iron (rGO-nZVI) micro-electrolysis Cr(VI) removal Groundwater remediation
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Application of Fe^0/C/Clay ceramics for decoloration of synthetic Acid Red 73 and Reactive Blue 4 wastewater by micro-electrolysis 被引量:7
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作者 Xiaowei ZHANG Qinyan YUE Dongting YUE Baoyu GAO Xiaojuan WANG 《Frontiers of Environmental Science & Engineering》 SCIE EI CAS CSCD 2015年第3期402-410,共9页
Dyes are common pollutants in textile wastewaters, and the treatment of the wastewater has now attracted much attention due to its wide application and low biodegradability. In this study, Fe^0/C/Clay ceramics, a kind... Dyes are common pollutants in textile wastewaters, and the treatment of the wastewater has now attracted much attention due to its wide application and low biodegradability. In this study, Fe^0/C/Clay ceramics, a kind of novel micro-electrolysis filler, were sintered and employed in a dynamic micro-electrolysis reactor for synthetic Acid Red 73 (AR73) and Reactive Blue 4 (RB4) wastewater treatment. The effects ofinfluent pH, hydraulic retention time (HRT), and aeration on the decoloration efficiencies of AR73 and RB4 were studied. The optimum conditions for wastewater treatment were: AR73, influent pH of 4, HRT of 2 h and aeration; RB4, influent pH of 5, HRT of 6 h and aeration. Under the optimum conditions, decoloration efficiency of AR73 and RB4 wastewater was 96% and 83%, respectively. Results of UV-vis spectrum scanning demonstrated that the chromophores were broken. Continuous running tests showed that improvement of micro-electrolysis system with Fe^0/C/Clay ceramics for AR73 and RB4 synthetic wastewater treatment could avoid failure of micro-electrolysis reactor, which indicated great potential for the practical application of the ceramics in the field of actual industrial wastewater treatment. 展开更多
关键词 Fe^0/C/Clay ceramics micro-electrolysis Acid Red 73 Reactive Blue 4 synthetic wastewater
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Treatment of coking wastewater by a novel electric assisted micro-electrolysis filter 被引量:12
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作者 Ruosong Xie Miaomiao Wu +3 位作者 Guangfei Qu Ping Ning Yingying Cai Pei Lv 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2018年第4期165-172,共8页
A newly designed electric assisted micro-electrolysis filter(E-ME) was developed to investigate its degradation efficiency for coking wastewater and correlated characteristics. The performance of the E-ME system was... A newly designed electric assisted micro-electrolysis filter(E-ME) was developed to investigate its degradation efficiency for coking wastewater and correlated characteristics. The performance of the E-ME system was compared with separate electrolysis(SE) and micro-electrolysis(ME) systems. The results showed a prominent synergistic effect on COD removal in E-ME systems. Gas chromatography/mass spectrometry(GC–MS) analysis confirmed that the applied electric field enhanced the degradation of phenolic compounds.Meanwhile, more biodegradable oxygen-bearing compounds were detected. SEM images of granular activated carbon(GAC) showed that inactivation and blocking were inhibited during the E-ME process. The effects of applied voltage and initial p H in E-ME systems were also studied. The best voltage value was 1 V, but synergistic effects existed even with lower applied voltage. E-ME systems exhibited some p H buffering capacity and attained the best efficiency in neutral media, which means that there is no need to adjust p H prior to or during the treatment process. Therefore, E-ME systems were confirmed as a promising technology for treatment of coking wastewater and other refractory wastewater. 展开更多
关键词 Coking wastewater micro-electrolysis Electrochemical COD removal
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Removal of TOC and Color in Bleaching Effluents from Straw Pulp and Paper Mill by Fe^0-H_2O_2 Process 被引量:2
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作者 于水利 刘汝鹏 刘亚男 《Journal of Donghua University(English Edition)》 EI CAS 2006年第3期114-119,共6页
TOC and color in the bleaching effluent from straw pulp paper process could not reach draining standard after its treatment by a biochemical process. In this study, advanced treatment by integrated micro-electrolysis ... TOC and color in the bleaching effluent from straw pulp paper process could not reach draining standard after its treatment by a biochemical process. In this study, advanced treatment by integrated micro-electrolysis (Fe^0) method and Fenton-like process was investigated under various conditions, i.e. pH, Fe/C ratio, initial I-I2O2 concentration and carrier gas. Results showed that Fe/C ratio(V/V = 1.5), larger H2O2 dosage around 50 rag/L, lower pH(pH= 3) turned out to be particularly efficient. Temperature was a key parameter, remarkably increasing reaction rates. Carrier air not only improved reaction efficiency, but also saved H2O2 dosage. Chlorinated organic compounds could be reductive dechlorinated by Fe^0 reaction and oxidated by OH produced from Fenton process. The combination of Fe^0 and H2O2 reactions had been proved to be highly effective for the advanced treatment of such a type of wastewaters, and important advantages concerning the application in the study. 展开更多
关键词 straw pulp and paper mill bleachingeffluents advanced treatment chlorinated organiccompounds micro-electrolysis Fenton-like process.
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