铁碳微电解预处理煤热解废水的效能及生物毒性研究
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摘要
为了有效提高煤热解废水中难降解有机化合物的去除效能以及改善出水的可生化性能,研究采用铁碳微电解法对煤热解废水进行预处理,并对微电解处理出水的可生化性与生物毒性进行了评价。结果表明,在铁碳(Fe-C)填料投加量为50 g/L,pH为5时,微电解反应效能较高,COD和总酚的去除率分别达到51.87%和54.32%。同时,微电解反应使煤热解废水中多种难降解有机污染物降解为简单的可生物降解有机化合物,从而使出水的可生化性B/C值提高到0.41,其可生化性显著提高。另外,微电解法可有效降低煤热解废水的生物毒性,使出水急性毒性单位(TU)降低约65%。可见,微电解法是一种高效可行的煤热解废水预处理手段,能够为后续生物工艺及深度处理工艺提供良好的水质条件。
In order to enhnace removal efficiency of refractory compounds and biodegradability of effluent,the iron-carbon micro-electrolysis process was used for coal pyrolysis wastewater pretreatment. The removal efficiency,biodegradability and biotoxicity of coal pyrolysis wastewater were studied in iron-carbon micro-electrolysis process.The results showed that the micro-electrolysis reaction performed high removal efficiency for coal pyrolysis wastewater at the condition of Fe-C filler content of 50 g/L and pH of 5,the corresponding COD and total phenol removal efficiency reached 51. 87% and 54. 32%,respectively. Meanwhile,micro-electrolysis could make massive refractory compounds be transformed into biodegradable compounds,and make B/C ratio increase to 0. 41,thereby effectively improving biodegradability of coal pyrolysis wastewater.Additionally,micro-electrolysis significantly reduced biotoxicity and reduced the effluent acute toxic unite( TU) by about 65%. It was suggested that iron-carbon micro-electrolysis is an efficient and feasible method for coal pyrolysis wastewater pretreatment,which can provide good water quality conditions for the subsequent biological process and advanced treatment process.
In order to enhnace removal efficiency of refractory compounds and biodegradability of effluent,the iron-carbon micro-electrolysis process was used for coal pyrolysis wastewater pretreatment. The removal efficiency,biodegradability and biotoxicity of coal pyrolysis wastewater were studied in iron-carbon micro-electrolysis process.The results showed that the micro-electrolysis reaction performed high removal efficiency for coal pyrolysis wastewater at the condition of Fe-C filler content of 50 g/L and pH of 5,the corresponding COD and total phenol removal efficiency reached 51. 87% and 54. 32%,respectively. Meanwhile,micro-electrolysis could make massive refractory compounds be transformed into biodegradable compounds,and make B/C ratio increase to 0. 41,thereby effectively improving biodegradability of coal pyrolysis wastewater.Additionally,micro-electrolysis significantly reduced biotoxicity and reduced the effluent acute toxic unite( TU) by about 65%. It was suggested that iron-carbon micro-electrolysis is an efficient and feasible method for coal pyrolysis wastewater pretreatment,which can provide good water quality conditions for the subsequent biological process and advanced treatment process.
引文
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[2]ZHUANG Haifeng,HAN Hongjun,JIA Shengyong,et al.Advanced treatment of biologically pretreated coal gasification wastewater using a novel anoxic moving bed biofilm reactor(ANMBBR)-biological aerated filter(BAF)system[J].Bioresource Technology,2014,157:223-230.
[3]WANG Wei,ZHANG Jing,WANG Shun,et al.Oxygen-limited aeration for relieving the impact of phenolic compounds in anaerobic treatment of coal gasification wastewater[J].International Biodeterioration Biodegradation,2014,95:110-116.
[4]ZHU Hao,MA Wencheng,HAN Hongjun,et al.Catalytic ozonation of quinoline using Nano-Mg O:efficacy,pathways,mechanisms and its application to real biologically pretreated coal gasification wastewater[J].Chemical Engineering Journal,2017,327:91-99.
[5]HOU Baolin,HAN Hongjun,ZHUANG Haifeng,et al.A novel integration of three-dimensional electro-Fenton and biological activated carbon and its application in the advanced treatment of biologically pretreated Lurgi coal gasification wastewater[J].Bioresource Technology,2015,196:721-725.
[6]JIA Shengyong,HAN Hongjun,ZHUANG Haifeng,et al.The pollutants removal and bacterial community dynamics relationship within a full-scale British Gas/Lurgi coal gasification wastewater treatment using a novel system[J].Bioresource Technology,2016,200:103-110.
[7]汪彩琴,高心怡,陈辉,等.微电解技术处理难降解工业废水的研究进展[J].化工环保,2016,36(5):477-481.WANG Caiqin,GAO Xinyi,CHEN Hui,et al.Research advance in treatment of refractory industrial wastewater by microelectrolysis[J].Environmental Protection of Chemical Industry,2016,36(5):477-481.
[8]MA Weiwei,HAN Yuxing,XU Chunyan,et al.Enhanced degradation of phenolic compounds in coal gasification wastewater by a novel integration of micro-electrolysis with biological reactor(MEBR)under the micro-oxygen condition[J].Bioresource Technology,2017,251:303-310.
[9]YANG Zemeng,MA Yuepeng,LIU Ying,et al.Degradation of organic pollutants in near-neutral p H solution by Fe-C micro-electrolysis system[J].Chemical Engineering Journal,2017,315:403-414.
[10]YANG Xiaoyi,XUE Yue,WANG Wenna.Mechanism,kinetics and application studies on enhanced activated sludge by interior microelectrolysis[J].Bioresource Technology,2009,100(2):649-653.
[11]QIN Shulin,LI Xiangdong,ZHANG Ting,et al.Pretreatment of chemical cleaning wastewater by microelectrolysis process[J].Procedia Environmental Sciences,2011,10:1154-1158.
[12]LAI Peng,ZHAO Huazhang,WANG Chao,et al.Advanced treatment of coking wastewater by coagulation and zero-valent iron processes[J].Journal of Hazardous Materials,2007,147(1/2):232-239.
[13]GAO Li,YUAN Tao,CHENG Peng,et al.Effects of triclosan and triclocarban on the growth inhibition,cell viability,genotoxicity and multixenobiotic resistance responses of Tetrahymena thermophila[J].Chemosphere,2015,139:434-440.
[14]魏复盛,齐文启.水和废水监测分析方法[M].4版.北京:中国环境科学出版社,2002.
[15]XIAO Jianan,YUE Qinyan,GAO Baoyu,et al.Performance of activated carbon/nanoscale zero-valent iron for removal of trihalomethanes(THMs)at infinitesimal concentration in drinking water[J].Chemical Engineering Journal,2014,253:63-72.
[16]肖仙英,陈中豪,陈元彩,等.微电解法处理造纸中段废水及其机理探讨[J].中国造纸,2005,24(7):14-17.XIAO Xianying,CHEN Zhonghao,CHEN Yuancai,et al.Papermaking middle-stage effluent treatment with micro-electrolysis method and its mechanism[J].China Pulp&Paper,2005,24(7):14-17.
[17]宫洪艳,李文波.各类金属离子对活性污泥法工艺的影响研究[J].山西建筑,2013,39(15):99-101.GONG Hongyan,LI Wenbo.The study on the effect of various kinds of metal ion on activated sludge process[J].Shanxi Architecture,2013,39(15):99-101.
[18]LIU Wenwu,TU Xueyan,WANG Xiuping,et al.Pretreatment of coking wastewater by acid out,micro-electrolysis process with in situ electrochemical peroxidation reaction[J].Chemical Engineering Journal,2012,200/202:720-728.
[19]YANG Xiaoyi,Interior microelectrolysis oxidation of polyester wastewater and its treatment technology[J].Journal Hazardous Materials,2009,169(1/3):480-487.
[20]ZHANG Shuo,WANG Dong,ZHOU Liang,et al.Intensified internal electrolysis for degradation of methylene blue as model compound induced by a novel hybrid material:multi-walled carbon nanotubes immobilized on zero-valent iron plates(Fe OCNTs)[J].Chemical Engineering Journal,2013,217:99-107.
[21]WANG Wei,MA Wencheng,HAN Hongjun,et al.Thermophilic anaerobic digestion of Lurgi coal gasification wastewater in a UASB reactor[J].Bioresource Technology,2011,102(3):2441-2447.
[22]李海春,葛利云,王红武,等.催化铁内电解法预处理对后续生物过程的影响[J].四川环境,2007,26(6):1-4.LI Haichun,GE Liyun,WANG Hongwu,et al.The influence of catalyzed iron inner electrolysis technique as a pretreatment on the later biological treatment[J].Sichuan Environment,2007,26(6):p.1-4.
[23]李雅洁,崔益斌,蒋丽娟,等.3种氯酚对噬热四膜虫的毒性效应[J].环境科学,2014.35(7):2755-2761.LI Yajie,CUI Yibin,JIANG Lijuan,et al.Toxicity of three chlorophenols to protozoa Tetrahymena thermophila[J].Environmental Science of China,2014,35(7):2755-2761.
[24]PERSOONE G,MARSALEK B,BLINOVA I,et al.A practical and user-friendly toxicity classification system with microbiotests for natural waters and wastewaters[J].Environmental Toxicology,2003,18(6):395-400.
[25]LIU Yongjun,LIU Jing,ZHANG Aining,et al.Treatment effects and genotoxicity relevance of the toxic organic pollutants in semicoking wastewater by combined treatment process[J].Environmental Pollution,2017,220:13-19.
[26]MA Xiaoyan,WANG Xiaochang,LIU Yongjun,et al.Variations in toxicity of semi-coking wastewater treatment processes and their toxicity prediction[J].Ecotoxicology and Environmental Safaty,2017,138:163-169.