【摘要】 为了解胞外聚合物(EPS)对污泥水解酸化处理的影响,采用批量试验研究了污泥厌氧水解酸化处理过程中EPS的变化以及温度、pH值、污泥来源、污泥浓度对其的影响.结果表明,pH值和污泥来源对EPS产率、成分有显著的影响.强酸性和强碱性条件下污泥水解过程中溶解性EPS产率是中性条件下的2倍多;强酸性条件下细胞破裂较多,DNA物质占总EPS含量的20%左右;强碱性条件多糖类物质溶出量占总EPS的80%以上.A/O工艺污泥水解酸化EPS产率最大,平均值为41.1mg/gVSS;其次为SBR、氧化沟(OD)和A2/O工艺污泥,其中OD工艺污泥水解酸化产生的EPS中糖类与蛋白质的质量比(φ)值远小于其他工艺污泥.温度由18℃升高至35℃时,溶解性EPS产率增加近50%,多糖所占比例逐渐增大.污泥浓度由2000mg/L升高至6000mg/L,EPS产率增大至38.1mg/gVSS,当污泥浓度达到8000mg/L时,EPS产率明显减少(23.1mg/gVSS).更多还原

【Abstract】 Variation of extracellular polymer substances(EPS) during activated sludge hydrolysis-acidification process and influencial factors including temperature,pH,sludge characteristic and sludge concentration were investigated at ambient temperature by batch experiments.pH and sludge characteristic had an important effect on the EPS composition and amount.Under strong acidic(pH =3,4) and strong basic condition(pH=11) the yields of EPS was one time higher than that of neutral condition.However,under strong acidic condition,much more biologic cells were broken and DNA accounted for 20% of total EPS,while carbohydrate mass accounted for 80% of total EPS under strong alkaline condition.The yield of EPS produced by A/O sludge was the highest with an average value of 41.1 mg/gVSS followed by SBR sludge,A2/O sludge and OD sludge.The ratios of polysaccharide to protein(φ) for OD sludge was the lowest.When temperature increased from 18℃ to 35℃,the EPS yields grew by 50% and the percentage of polysaccharide in total EPS rised gradually.EPS yields could be 38.1 mg/gVSS when the MLSS increased from 2000 mg/L to 6000 mg/L,however,the EPS yields would decrease to 23.1 mg/gVSS if the MLSS increased to 8000 mg/L.更多还原