好氧浸没式膜生物反应器中同步脱氮除磷

Simultaneous nitrogen and phosphor removal in an aerobic submerged membrane bioreactor.

作者信息

Wang Zhi-Wei, Wu Zhi-Chao, Gu Guo-Wei, Yu Guo-Ping, Ma Lu-Ming

机构信息

State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.

出版信息

J Environ Sci (China). 2006;18(3):439-45.

PMID:17294637

Abstract

Simultaneous nitrification and denitrification (SND) effect and phosphor removal were investigated in a one-staged aerobic submerged membrane bioreactor on pilot-scale with mixed liquor suspended solids (MLSS) 19-20 g/L. The effects of DO concentration, sludge floc size distribution on SND were studied. Test results suggested that SND was successfully performed in the membrane bioreactor (MBR) and about 70% total nitrogen removal efficiency was achieved when DO concentration was set to 0.2-0.3 mg/L. The main mechanisms governing SND were the suitable sludge floc size and the low DO concentration which was caused by low oxygen transfer rate with such a high MLSS concentration in the MBR. In the meantime, phosphor removal was also studied with polymer ferric sulfate (PFS) addition and 14 mg/L dosage of PFS was proper for the MBR to remove phosphor. PFS addition also benefited the MBR operation owing to its reduction of extracellular polymer substances (EPS) of mixed liquor.

摘要

在中试规模的单级好氧浸没式膜生物反应器中，研究了混合液悬浮固体（MLSS）为19 - 20 g/L时的同步硝化反硝化（SND）效应和除磷效果。研究了溶解氧（DO）浓度、污泥絮体尺寸分布对SND的影响。试验结果表明，在膜生物反应器（MBR）中成功实现了SND，当DO浓度设定为0.2 - 0.3 mg/L时，总氮去除效率达到约70%。控制SND的主要机制是合适的污泥絮体尺寸和低DO浓度，这是由MBR中如此高的MLSS浓度导致的低氧传递速率引起的。同时，还研究了添加聚合硫酸铁（PFS）的除磷效果，14 mg/L的PFS投加量对MBR除磷是合适的。添加PFS还有利于MBR的运行，因为它减少了混合液的胞外聚合物（EPS）。