微生物絮凝剂投加方式对好氧颗粒污泥性能的影响

摘要

Aerobic granular sludge was cultivated successfully by adding microbial flocculant in the sequencing batch airlift reactors (SBARs ). The physical-chemical properties and biodegradation efficiencies of the granules were studied to investigate the influence of microbial flocculant dosing way on the characteristics of aerobic granular sludge.The results showed that dosing way has a significant influence on the granulation of aerobic sludge.Aerobic granules could be formed when a certain amount of flocculant bacterium were adding into SBARs every 2,3,5,7 days,respectively.The optimum dosing way was dosing every 5 day,in which case the grranulation term of aerobic granules was only 42 d,and was faster than that of 60 d in blank experiment.SVI was around 40 mL/g,settling velocity reached 35.06 m/h,the COD,NH +4 N and TP removal rates of mature granular sludge was 96.55%, 93.29% and 87.29%,respectively.%为提高好氧污泥颗粒化速度,采用微生物絮凝剂,探讨在好氧颗粒污泥培养过程中微生物絮凝剂的投加方式对颗粒污泥理化性能及生物降解效能的影响。结果表明：微生物絮凝剂每隔2、3、5、7 d 投加一次时,均可培养出成熟的好氧颗粒污泥,微生物絮凝剂的投加方式对好氧污泥颗粒化的影响较显著；微生物絮凝剂最佳投加方式为每5天投加一次,此时颗粒化速度快,颗粒形成时间由未投加的60 d 缩短为42 d,好氧颗粒污泥疏水性好,污泥体积指数稳定在40 mL/g 左右,沉降速度达35.06 m/h,COD、氨氮和总磷的去除率分别为96.55%、93.29%和87.29%。