摘要
研究了污泥龄(SRT)对膜生物反应器中微生物的存在状态、污泥增殖动力学、污泥活性及污染物去除率等的影响。研究结果表明,随着SRT延长,TB中多糖与蛋白质比例增大,这增大了细菌表面亲水基和疏水基的比例,使细菌存在状态由不稳定型(R型)向稳定型(S型)转变,造成污泥的沉降困难。MBR中微型动物群落结构随SRT的延长呈现规律性变化,对MBR的运行有指示作用。在实验的SRT条件下,污泥比耗氧速率在4.6～2.8 mg O2/(g MLVSS.h)之间,比增长速率在6.7～3.9 d-1之间。导出了预测MBR工艺污泥浓度的数学模型。
The effects of sludge retention time（SRT） on the state of micro-organisms,the kinetics of sludge multiplication,the sludge activity and the efficiency of pollutant removal were investigated in a membrane bioreactor.The results indicated that with the extension of sludge retention time（SRT） the ratios of polysaccharide and protein in tightly bound EPS（TB） of the total extracellular polymeric substances（EPS） increased,that made the proportion of hydrophilic group and hydrophobic group increase,then the bacteria were transformed from the unstable（R） to the stable（S） and the sludge was difficult to settle.The change of microfauna community was regular with SRT extension,which could be indicative for the operation of the MBR.At the different SRTs the rate of specific oxygen uptake and the rate of specific growth in the MBR were 4.6～2.8 mg O2/（g MLVSS·h） and 6.7～3.9 d^-1,respectively.Mathematical model for forecasting sludge concentration was put forward.
出处
《环境工程学报》
CAS
CSCD
北大核心
2011年第4期801-806,共6页
Chinese Journal of Environmental Engineering
基金
天津市自然科学基金资助项目(08JCZDJC24300)
天津教委基金项目(20070706)
关键词
膜生物反应器
污泥龄
微生物特性
比增长速率
胞外聚合物
membrane bioreactor
sludge retention time
micro-organism characteristics
specific growth rate
extracellular polymeric substances
