小回流比条件下污泥浓度分区试验研究

Pilot Validation of Sludge Concentration Partition at Small Reflux Ratio Condition

用次毫米过滤(sub-milliFiltration,SMF)组件将生物处理系统内的污泥分为高浓度区和低浓度区,使高浓度区保持大量污泥,强化对有机物的去除,使低浓度区污泥浓度满足膜分离的要求.主要验证了小回流比(R为0.5、1.0、1.5、2.0)条件下污泥浓度分区的效果,考察了采用SMF组件后,系统对COD的去除效果,并将各小回流比条件下A、B两区污泥浓度的理论值和实测值做比较.结果表明,在小回流比条件下可实现污泥浓度分区,低浓度区的MLSS在9 g.L-1以下,高浓度区的MLSS在20 g.L-1以上;系统的COD平均去除率超过90%;A、B两区MLVSS的理论值与实测值具有相关性.

Using sub-milliFiltration(SMF) module get the sludge of the system divide into high concentration part and low concentration part,in order to make the high concentration part retain activated sludge to strengthen removal rate of organics and the low concentration part meet the need of MBR.Discussing the sludge concentration partition effect under the conditions of small reflux ratio(R 0.5,1.0,1.5,2.0),In addition,investigating the COD removal efficiency of the system with SMF Module,comparing the measured and theoretical value of the MLVSS at each small reflux ratio.Results show that: the method of sludge concentration partition at small reflux ratio condition is feasible,the MLSS of the low concentration part is below 9 g·L-1 and the high concentration part is above 20 g·L-1;average removal rate of COD is above 90%;measured value of the two part is related to theoretical value.