城市生活垃圾渗滤液的ASBR-SBR生物脱氮研究

将ASBR和SBR反应器组合起来,形成一种序批式操作的垃圾渗滤液处理工艺,两反应器的运行周期均为12h。将原水加入ASBR中进行厌氧消化,研究了废水在28.8h～72h四种不同水力停留时间(HRT)下的处理效果,结果表明,将ASBR的HRT控制在36h,在保持41.2%COD去除率的同时,出水BOD5/COD及BOD5/NH4+-N分别为0.41和4.6,对有机物和氮的后续好氧生物去除较为有利。以HRT为36h方式运行的ASBR出水为进水,研究了每周期进水量占反应器混合液比例R分别为0.67、0.50、0.33和0.17情况下,SBR去除有机物及脱氮的效果,结果表明,对于pH较低的垃圾渗滤液,R≤0.5时,反应器内反硝化反应产生的碱度和硝化反应消耗的碱度较为平衡,pH稳定在脱氮微生物适宜的范围内,脱氮及去除有机物的效果较好,对COD去除率在88%～90%,NH4+-N去除率在96%～98%,TN去除率在55%～84%,其中TN去除率与R存在较好的线性相关性,TN去除率随着R的减小而逐步提高.

Biological Nitrogen Removal of Municipal Landfill Leachate by ASBR-SBR System

Biological nitrogen and organic matter removal of municipal landfill leachate by ASBR-SBR system was investigated. The cycle length of both reactors was 12h. Raw wastewater was fed to ASBR for anaerobic digestion, with testing of HRT from 28.8h to 72h. Results indicated that COD removal achieved 41.2% and effluent BOD5 / COD and BOD5 / NH4+-N were 0.41 and 4.6 respectively when HRT of ASRB was 36h, which was in favor of aerobic biological treatment of organic carbon and nitrogen. Effluent of ASBR whose HRT was 36h was added to SBR for further treatment. For ratios from 0.17 to 0.67 was tested. Average performance of SBR, in the conditions that influent-to-mixed liquor ratios of 0.67, 0.50, 0.33 and 0.17, were correspondingly better with a COD removal of 88%～90%, NH4+-N removal of 96%～98% and 55%～84% of TN. TN removal had relation with influent-to-mixed liquor ratio and TN removal of SBR increased with decrease of the influent-to-mixed liquor ratio.