Effect of PAC addition on sludge properties in an MBR treating high strength wastewater.
Effect of PAC addition on sludge properties in an MBR treating high strength wastewater.
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DOI：
10.1016/j.watres.2009.01.003
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发表时间：
2009-04
期刊：
影响因子：
12.8
通讯作者：
Y. Satyawali;M. Balakrishnan
中科院分区：
文献类型：
--
作者：
Y. Satyawali;M. Balakrishnan
研究了一体式膜生物反应器（MBR）处理高浓度酒精废水的污泥特性。研究了两个膜生物反应器，每个都有一个30μm的筛网过滤器，有和没有添加粉末活性炭（PAC）。在3.4 - 6.9kgCOD m-3day-1的不同有机负荷下进行了实验，并在180天的时间内监测了比耗氧速率（SOUR）、污泥体积指数（SVI）、混合液悬浮固体（MLSS）、粒径和胞外聚合物（EPS）。呼吸测定实验没有显示出增加与PAC补充的微生物活性。PAC的投加降低了污泥的SVI，从而明显改善了污泥的脱水性能。随着时间的推移，污泥颗粒的大小，增加，似乎是独立的PAC添加，但受曝气强度。PAC也没有影响污泥EPS浓度，然而，EPS组合物，在蛋白质/碳水化合物（多糖）的比例方面的改变，导致高P/C比。红外光谱分析表明，污泥多糖的功能基团似乎参与其与PAC的相互作用。
This paper examines the sludge characteristics in a submerged membrane bioreactor (MBR) operated on a high strength wastewater from an alcohol distillery. Two membrane bioreactors, each with a 30μm mesh filter, were investigated with and without addition of powdered activated carbon (PAC). Experiments were conducted with varying organic loading rates ranging from 3.4 to 6.9kgCOD m−3day−1and the specific oxygen uptake rate (SOUR), sludge volume index (SVI), mixed liquor suspended solids (MLSS), particle size and extracellular polymeric substances (EPS) were monitored over a 180day period. Respirometric experiments did not show enhancement in microbial activity with PAC supplementation. Addition of PAC decreased the SVI thereby perceptibly improving sludge dewaterability. The sludge particle size, which increased with time, appeared to be independent of PAC addition but was influenced by the aeration intensity. PAC also did not affect the sludge EPS concentration; however, the EPS composition, in terms of protein/carbohydrate (polysaccharide) ratio was altered resulting in a high P/C ratio. FTIR analysis of the sludge samples indicated that the functional groups associated with the sludge polysaccharides appear to be involved in its interaction with PAC.