新型生物流化床A/O工艺处理煤制乙二醇废水的中试研究
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摘要
为了考察生物流化床缺氧/好氧(A/O)工艺处理煤制乙二醇废水的效果,将引自工业污水处理装置侧线的煤气化废水和合成气制乙二醇废水的混合水在生物流化床A/O中试装置进行了生化处理试验。试验对A/O工艺影响因素和长周期运行分别进行了考察。试验结果表明:在温度为30～35℃,pH值为7. 0～7. 5,好氧床停留时间(HRT)为10～12 h时,COD和NH_3-N的去除率相对较高,处理效果最佳。此条件下,当进口水的平均COD,氨氮(NH_3-N)和总氮(TN)依次为760,57和224 mg/L时,经处理后的出口水平均COD,NH_3-N和TN依次低于60,8,和50 mg/L,平均去除率依次达到90%,85%,78%。说明此工艺对煤制乙二醇废水具有较好的处理效果。
To investigate the effect of biological fluidized bed A/O process on the treatment of coal-basedethylene glycol's wastewater,the wastewater of the coal gasification and the wastewater from ethylene glycolproduction which were led from industry waste water treatment plant were mixed and led into the pilot plantequipment of biological fluidized bed A/O process for the biochemical treatment. The impact factors and longcycle operation of the A/O process were investigated in the tests. The test results showed that: when T = 30 ～35 ℃,p H = 7. 0 ～ 7. 5 and the aerobic reactor HRT = 10 ～ 12 h,the removal rates of COD and NH_3-N wererelatively higher,and the treatment efficiency was the best. Under this condition and when the inlet water'saverage COD,NH_3-N and TN were 760 mg/L,57 mg/L and 224 mg/L respectively,the outlet water's aver-age COD,NH_3-N and TN were lower than 60 mg/L,8 mg/L and 50 mg/L respectively after treatment,andthe average removal rates were 90%,85% and 78% respectively. It shows that this process has a better treat-ment effect for coal-based ethylene glycol wastewater.
To investigate the effect of biological fluidized bed A/O process on the treatment of coal-basedethylene glycol's wastewater,the wastewater of the coal gasification and the wastewater from ethylene glycolproduction which were led from industry waste water treatment plant were mixed and led into the pilot plantequipment of biological fluidized bed A/O process for the biochemical treatment. The impact factors and longcycle operation of the A/O process were investigated in the tests. The test results showed that: when T = 30 ～35 ℃,p H = 7. 0 ～ 7. 5 and the aerobic reactor HRT = 10 ～ 12 h,the removal rates of COD and NH_3-N wererelatively higher,and the treatment efficiency was the best. Under this condition and when the inlet water'saverage COD,NH_3-N and TN were 760 mg/L,57 mg/L and 224 mg/L respectively,the outlet water's aver-age COD,NH_3-N and TN were lower than 60 mg/L,8 mg/L and 50 mg/L respectively after treatment,andthe average removal rates were 90%,85% and 78% respectively. It shows that this process has a better treat-ment effect for coal-based ethylene glycol wastewater.
引文
[1]刘献玲,张建成,王繁华,等.用于污水处理的三相生物流化床反应器:200520030608. 5[P]. 2005-04-28.
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[6]周平,钱易.内循环生物流化床反应器的理论分析[J].环境科学,1995,16(2):88.
[2]SIEGEL M H,MERCHUK J C. Mass-transfer a rectangular airlift reactor-effects of geometry and gas recirculation[J]. Biotechnology and Bioengineering. 1988,32(9):1128.
[3]SHIEH W K,LI C T. Anoxic oxic activated-sludge treatment kinetics of cyanides and phenols[J]. Journal of Environmental Engineering. 1988,115(1):65.
[4]WAGNER K,HEMPEL D C. Biodegradation by immobilized bacteria in an airlift-loopreactor-influence of biofilm diffusion limitation[J]. Biotechnology and Bioengineering. 1988,31:559.
[5]FRIJTERS C T,VELLINGA S,JORNA T,et al. Extensive nitrogen removal in a new type of airlift reactor[J]. Water Science and Technology. 2000,41(4-5):469.
[6]周平,钱易.内循环生物流化床反应器的理论分析[J].环境科学,1995,16(2):88.