碱度对膜生物反应器硝化过程和膜污染的影响  

Effect of influent alkalinity on nitrification and membrane pollution of membrane bioreactor

作　　者：胡苗苗[1] 洪俊明[1] 李尚惠 戴兰华 陈向强 谢小青 

机构地区：[1]华侨大学环境科学与工程系,厦门361021 [2]厦门市排水监测站,厦门361005 [3]厦门水务中环污水处理有限公司,厦门361005

出　　处：《环境工程学报》2015年第10期4711-4716,共6页Chinese Journal of Environmental Engineering

基　　金：厦门科技计划项目(3502Z20131026);"水体污染控制与治理科技"重大专项(2012ZX07313-001-08);国家自然科学基金资助项目(51078157)

摘　　要：采用一体化浸没式膜生物反应器处理生活污水,研究进水碱度对硝化过程和膜污染过程的影响。结果表明,碱度对膜生物反应器工艺的硝化过程影响较大;当碱度充足（224~510 mg/L）时,氨氮去除率达到98.6%,出水的p H基本稳定,当进水碱度不足时,氨氮去除率下降,出水的p H低于6,p H变化滞后于碱度的变化;进水碱度变化对COD去除影响不大,去除率稳定在91%以上;随着进水碱度下降,膜生物反应器内的胞外聚合物EPS由10 mg/g MLSS上升至26 mg/g MLSS,碱度充足时MBR运行周期最长可达10 d,当碱度不足引起反应器中的EPS浓度上升,导致膜污染加剧,膜生物反应器的运行周期下降到2 d。The effect of the influent alkalinity on the nitrification during wastewater treatment by a submerged membrane bioreactor was investigated,and the parameters of the reactor were tested at the same time. The results showed that the alkalinity had a significant effect on the nitrification. When the alkalinity was sufficient（ 224—510 mg /L）,the ammonia nitrogen removal rate was over 98. 6%,and the p H was stable. While the alkalinity was insufficient,the ammonia nitrogen removal rate decreased and the effect of p H on the influent of MBR was lagged behind the alkalinity. There was little effect on the COD of the effluent,and the removal efficiency reached 91%. As the alkalinity of influent dipped,EPS increased from 10 to 26 mg / g MLSS,which caused the inverses washing cycle shorten and membrane pollution was aggravating. The inverses washing cycle was up to 10 d when the alkalinity of influent was sufficient,but decreased to 2 d while the alkalinity was insufficient.

关 键 词：膜生物反应器 碱度 硝化过程 膜污染 

分 类 号：X703[环境科学与工程—环境工程]