水解酸化预处理汽车涂装废水的效能分析
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摘要
针对含有大分子难降解有机物的汽车涂装废水,直接使用好氧生物处理效果不佳,提出采用具有水力循环系统的水解酸化反应器对其进行预处理以提高其生物降解性。其运行效果使用COD去除率,酸化率等其他指标进行评价。试验结果表明:在进水全部为汽车涂装废水,反应时间为24 h,循环流量为180 L/h以及温度在常温的条件下,COD去除率稳定在20%左右,酸化率可达到约10%,与进水pH相比出水pH下降0.10-0.46。通过研究反应时间、COD体积负荷和循环流量对水解酸化的影响,将反应时间控制在20-24 h,容积负荷在1.2-1.3 kg/m~3.d,循环流量在180-240 L/h时,该废水的COD去除率或酸化率较高。结果表明:汽车涂装废水经过该方法预处理后,生物降解性和产酸量都有所提高,为后期好氧生物处理减轻了有机负荷。
For automotive coating wastewater containing macromolecule-degradable organics,the effect of aerobic biological treatment is not directly used,and a hydrolytic acidification reactor with a hydraulic circulation system is proposed to pretreat it to enhance its biodegradability. The operating effect is evaluated using other indicators such as COD removal rate and acidification rate. The test results show that:the influent water is all automotive coating wastewater,the reaction time is 24 h,the circulation flow is 180 L/h,and the temperature is normal temperature,the COD removal rate is stable at about 20%,and the acidification rate can reach about 10%. The pH of the effluent water decreased by 0.10-0.46 compared to the pH of the influent.By examining the influence of reaction time,COD volume loading,and circulation flow rate on the hydrolysis acidification,the reaction time was controlled at 20-24 h,the volumetric loading was 1.2-1.3 kg/m~3.d,and the circulating flow rate was 180-240 L/h. The COD removal rate or acidification rate is higher.The results showed that the biodegradability and acid production of automotive coating wastewater after pretreatment were improved,which reduced the organic load for later aerobic biological treatment.
For automotive coating wastewater containing macromolecule-degradable organics,the effect of aerobic biological treatment is not directly used,and a hydrolytic acidification reactor with a hydraulic circulation system is proposed to pretreat it to enhance its biodegradability. The operating effect is evaluated using other indicators such as COD removal rate and acidification rate. The test results show that:the influent water is all automotive coating wastewater,the reaction time is 24 h,the circulation flow is 180 L/h,and the temperature is normal temperature,the COD removal rate is stable at about 20%,and the acidification rate can reach about 10%. The pH of the effluent water decreased by 0.10-0.46 compared to the pH of the influent.By examining the influence of reaction time,COD volume loading,and circulation flow rate on the hydrolysis acidification,the reaction time was controlled at 20-24 h,the volumetric loading was 1.2-1.3 kg/m~3.d,and the circulating flow rate was 180-240 L/h. The COD removal rate or acidification rate is higher.The results showed that the biodegradability and acid production of automotive coating wastewater after pretreatment were improved,which reduced the organic load for later aerobic biological treatment.
引文
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[14]D.Cysneiros,C.J.Banks,S.Heaven,et al.The effect of pH control and‘hydraulic flush'on hydrolysis and Volatile Fatty Acids(VFA)production and profile in anaerobic leach bed reactors digesting a high solids content substrate[J].Bioresource Technology,2012(123):263-271.
[15]伊学农,耿成,董艳玲,等.Fenton+水解/接触氧化处理涂装废水工程改造与调试[J].中国给水排水,2017,33(22):119-124.
[16]刘振英,刘亦洋,史萌,等.水解酸化预处理光学工业生产废水的效果研究[J].生态环境学报,2010,19(05):1050-1053.
[2]韦东,沈致和.汽车涂装废水处理工程实践[J].工业用水与废水,2011,42(2):72-75.
[3]Ince M.Treatment of manganese-phosphate coating wastewater by electrocoagulation[J].Separation Science and Technology,2013,48(3):515-522.
[4]刘绍根.汽车涂装废水处理技术[J].工业用水与废水,2001,32(2):11-13.
[5]蒋宏国,罗琳,朱凌峰.汽车涂装废水处理工程的研究[J].水处理技术,2009,35(7):113-115.
[6]Lozecznik S,Sparling R,Clark S P,et al.Acetate and propionate impact on the methanogenesis of landfill leachate and the reduction of clogging components.Bioresource Technology,2012(104):37-43.
[7]宋梦琪,周春江,马鲁铭.水解酸化工艺处理印染废水的机理[J].环境工程学报,2015,9(1):102-106.
[8]Zhou A,Guo Z,Yang C,et al.Volatile fatty acids productivity by anaerobic co-digesting waste activated sludge and corn straw:Effect of feedstock proportion[J].Journal of biotechnology,2013,168(2):234-239.
[9]彭永臻,王建龙,王淑莹,等.污水复合式厌氧水解酸化预处理试验研究[J].北京工业大学学报,2008,34(1):80-84.
[10]Liu W W,Tu X Y,Wang X P,et al.Pretreatment of coking wastewater by acid out,micro-electrolysis process with in situ electrochemical peroxidation reaction[J].Chemical Engineering Journal,2012(200):720-728.
[11]国家环境保护总局.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.
[12]Elmitwalli T A,Zandvoort M H,Zeeman G,et al.Low temperature treatment of domestic sewage in upflow anaerobic sludge blanket and anaerobic hybrid reactors[J].Water Science and Technology,1999,39(5):177-185.
[13]钱易,汤鸿霄,文湘华.水体颗粒物和难降解有机物的特性与控制技术原理-难降解有机物(下卷)[M].北京:中国环境科学出版社,2000.
[14]D.Cysneiros,C.J.Banks,S.Heaven,et al.The effect of pH control and‘hydraulic flush'on hydrolysis and Volatile Fatty Acids(VFA)production and profile in anaerobic leach bed reactors digesting a high solids content substrate[J].Bioresource Technology,2012(123):263-271.
[15]伊学农,耿成,董艳玲,等.Fenton+水解/接触氧化处理涂装废水工程改造与调试[J].中国给水排水,2017,33(22):119-124.
[16]刘振英,刘亦洋,史萌,等.水解酸化预处理光学工业生产废水的效果研究[J].生态环境学报,2010,19(05):1050-1053.
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