A Study on NH₃-N Removal of Coke Wastewater by Submerged Membrane Sequencng - Bawh Bioreactor
GENG Yan 1, ZHOU Qi1 , LI Chun-jie 2
(1. College of Environ. Scie. & Eng., Tongii University, Shanghai 20(X)92, China;
2. College of Environ. Scie. & Eng., Shanghai Jiaotong University, Shanghai 20()240, China)

　　Abstract: A submerged membrane Sequencing Batch Bioreactor was used to treat coke wastewater. The results show that: the system was deeply affected by temperature, pH value of the effluent, DO of the mixed liqUid, sudden raise of influent NH3-N concentration. As the result of membrane separation, the ammonia oxidizing bacteria was all kept in the reactor and the nitrifying ability of the system was enhanced. Membrane seParation results in the accurnulation of the bacterial metabolic products, which inhibit the activities of nitrite oxidizing bacteria and make the nitrite to accumulate.
　 Key words: Membrane Bioreactor; SeqUencing Batch Reactor; coke wastewater; wastewher treatment

前言

　　膜生物反应器加（Membrane Bioreactor），是通过膜分离强化生物处理效果的组合工艺。由于膜的截留作用，微生物不随出水流失，同时大分子难降解物质和微生物代谢产物也保留在反应器内，其中有些物质可能对微生物生理活动产生一些影响，使得膜生 物反应器在NH3－N的去除中，具有不同于普通活性污泥法的性质。本试验通过一年多的运行，研究了在较长泥龄条件下，膜生物反应器对焦化废水中NH3－N的去除特点，并探讨了NH₃－N去除的影响因素。

1 试验材料和试验方法

1.1 试验装置及材料
　　试验采用一体式膜生物反应器进行研究，试验装置如图1所示。反应器容积15L，膜组件采用PVDF中空纤维微滤膜，孔径0.15μm，膜面积0.22m²。

1.2 运行条件
　　生物反应器的运行方式分为两阶段。
　　阶段一：从1999年9月27日起的310天采用缺氧一好氧工艺运行，运行周期为24h，其中缺氧进水6h，曝气反应15h，膜排水2h（排水量11L），闲置1h。