Effect of Powdered Activated Carbon on the Performance of an Aerobic Membarane Bioreactor: Comparison between Cross‐Flow and Submerged Membrane Systems
Effect of Powdered Activated Carbon on the Performance of an Aerobic Membarane Bioreactor: Comparison between Cross‐Flow and Submerged Membrane Systems
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DOI：
10.2175/106143003x141105
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发表时间：
2003-07
影响因子：
3.1
通讯作者：
Jae-Seok Kim;Chung‐Hak Lee
中科院分区：
文献类型：
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作者：
Jae-Seok Kim;Chung‐Hak Lee
研究了粉末活性炭（PAC）在两种不同过滤模式下对好氧膜生物反应器性能的影响：横流过滤和淹没过滤。在交叉流微滤模式下，污泥再循环导致的絮团破碎导致微生物絮团尺寸迅速减小，并释放胶体和可溶性成分，包括细胞外聚合物（EPS）。释放的成分通过在膜表面形成致密的饼层而使膜的渗透性迅速丧失。添加PAC形成的生物活性炭（BAC）污泥释放出较少量的细胶体和EPS。尽管泵送剪切作用下BAC污泥的絮体破碎模式与常规活性污泥相似，但BAC微生物絮体中的PAC将一些微絮体成分吸附或截留到絮体中，与常规活性污泥相比，其渗透性损失减少了约35%。在浸没微滤模式下，PAC的加入效果更为明显。对于BAC污泥，其跨膜压力的增加较为缓慢，运行间隔可延长至普通活性污泥浸没式膜生物反应器的3倍。
The effects of powdered activated carbon (PAC) on the performance of an aerobic membrane bioreactor were investigated under two different filtration modes: cross‐flow and submerged filtration. Under a cross‐flow microfiltration mode, floe breakage resulting from sludge recirculation caused a rapid decrease in the microbial floe size and the release of colloidal and soluble components including extracellular polymeric substances (EPS). The released components caused rapid loss of membrane permeability by the formation of a dense cake layer on the surface of the membrane. Biological activated carbon (BAC) sludge formed by the addition of PAC released lower amounts of fine colloids and EPS. Although the pattern of floe breakage of the BAC sludge by pumping shear was similar to that of conventional activated sludge, PAC in the BAC microbial floe adsorbed or entrapped some microfloe components into the floe and reduced permeability loss by approximately 35% compared with conventional activated sludge. Under a submerged microfiltration mode, the effect of PAC addition was more pronounced. For the BAC sludge, the increase in transmembrane pressure was more sluggish and, thus, the operating interval could be extended up to 3 times that for the submerged membrane bioreactor with normal activated sludge.