添加PAC对处理高强度废水的MBR中污泥性质的影响

时间：2009-04-01  阅读：    我要评论:

原文题目：

Effect of PAC addition on sludge properties in an MBR treating high strength wastewater

作者：

Yamini Satyawali and Malini Balakrishnan

Abstract

  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 30 μm 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 6.9 kgCOD m^??3 day^??1 and 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 180 day 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.

Keywords: Membrane bioreactor (MBR); Distillery wastewater; Mesh filter; Powdered activated carbon (PAC); Extracellular polymeric substances (EPS); Sludge volume index (SVI)

Water Research
Volume 43, Issue 6, April 2009, Pages 1577-1588

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