煤制聚甲醛废水的生物强化处理研究
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摘要
针对煤制聚甲醛废水好氧段甲醛、TOX和COD去除率低的现状,筛选并复配组合型微生物强化菌剂RJ,应用于宁夏某煤化工聚甲醛污水厂好氧段进行生物强化中试试验。试验表明,系统在经历负荷冲击期后运行稳定,活性泥生长状态良好,系统最终出水甲醛浓度均低于4 mg/L,甲醛去除率高达97.8%,三聚甲醛(TOX)去除率达94.2%,COD去除率达92.6%,都远高于该污水厂氧化段的现有去除率,可实现甲醛、TOX和COD的高效去除,为该强化菌剂的实际后续应用提供了可靠的依据。
A kind of effective multiple microbes strains RJ was selected and assembled,and one pilot-scale reactor,simulating full-scale wastewater treatment plant for POM,was built to evaluate its effect. The effluent quality reached a steady state after 10 days operation; 40 days later,activated sludge of pilot group was denser,and a bigger granularity was obtained,in comparison to that in the original system and same period,and even rotifers appeared,which indicated that the pilot system got stability after the load shock,and the activated sludge was growing very well. The formaldehyde in effluent was steadily below 4 mg/L,and the reduction rate of formaldehyde,s-trioxane( TOX) and COD was 97. 8%,94. 2% and92. 6%,respectively,all higher than the true removal rates in the original oxidation process. These outcomes suggested high removal efficiencies of formaldehyde,TOX and COD. All above were indispensable for later applications on compound bacteria RJ and full-scale bio-augmentation.
A kind of effective multiple microbes strains RJ was selected and assembled,and one pilot-scale reactor,simulating full-scale wastewater treatment plant for POM,was built to evaluate its effect. The effluent quality reached a steady state after 10 days operation; 40 days later,activated sludge of pilot group was denser,and a bigger granularity was obtained,in comparison to that in the original system and same period,and even rotifers appeared,which indicated that the pilot system got stability after the load shock,and the activated sludge was growing very well. The formaldehyde in effluent was steadily below 4 mg/L,and the reduction rate of formaldehyde,s-trioxane( TOX) and COD was 97. 8%,94. 2% and92. 6%,respectively,all higher than the true removal rates in the original oxidation process. These outcomes suggested high removal efficiencies of formaldehyde,TOX and COD. All above were indispensable for later applications on compound bacteria RJ and full-scale bio-augmentation.
引文
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[3]徐潇雨,郑俊,魏金亮.煤制聚甲醛废水处理工艺研究[J].给水排水,2013(S1):324-326.
[4]张翔,王彦辉,赵波,等.预处理+A2/O工艺在聚甲醛废水处理中的应用[J].河南化工,2015(7):49-51.
[5]王志海,魏宏斌,姜红,等.石灰法处理甲醛废水的试验研究[J].给水排水,2010,36(1):142-145.
[6]杨帅.煤化工聚甲醛污水电絮凝试验研究[J].广州化工,2014(24):127-129.
[7]李启武,姚富鹏,张俊丰.含多聚甲醛类化合物高浓度COD废水处理方法研究[J].四川环境,2012,31(2):71-73.
[8]窦建军.生物强化技术处理合成制药废水及其生物相恢复的工程实例[D].重庆:重庆大学,2012.
[9]Zhu Xiaobiao,Liu Rui,Liu Cong,et al.Bioaugmentation with isolated strains for the removal of toxic and refractory organics from coking wastewater in a membrane bioreactor[J].Biodegradation,2015,26(6):465-474.
[10]Jiang H L,Tay J H,Tay S T.Changes in structure,activity and metabolism of aerobic granules as a microbial response to high phenol loading[J].Appl Microbiol Biotechnol,2004,63(5):602-608.