污泥浓度对膜生物反应器运行特性的影响研究

反应器内的污泥浓度是膜生物反应器（MBR）运行的重要参数之一，它不仅影响污染物的去除效果，还影响膜组件的产水量。考察了MBR处理生活污水过程中，污泥浓度的增长规律，结果表明：在试验初始阶段，MLVSS与MLSS均随时间的增加而增加，在试验进行第30d以后，MLVSS值基本稳定在6200mg/L在右，而MLSS则继续增加，MLVSS／MLSS值逐渐下降，由85％下降到63％。在不同MLSS下，对COD、NH3－N、TN的去除效果进行了研究，得出在一定范围内，MLSS的增加，有利于提高COD和NH3－N的去除效果；当MLSS过高时，反而会影响COD和NH3－N的去除效果；而TN匠去除效果随MLSS的增加而增加。文中最后考察了膜的产水量与MLSS浓度大小的关系，得出二者为线性负相关。

Effect of sludge concentration on operational characteristics of membrane bioreactor

Sludge concentration in a bio reactor is one of the important parameters for MBR. It influences not only the removal efficiencies of pollutants but also the flux of membrane module. This paper studied the increasing rule of sludge concentration during MBR treating domestic sewage. The result showed that MLVSS and MLSS both increased with time at the initial stages, but after 30 days the value of MLVSS was kept at about 6 200 mg/L,whereas MLSS continues to increase. The ratio of MLVSS/MLSS was decreased gradually from 85% to 63%.The paper simultaneity examined the treatment effects of COD?NH 3 N, TN under different mixed liquor suspended solids and drew the conclusions: the increasing of MLSS is in the favor of improving the removal efficiencies of COD and NH 3 N in a certain range. Finally, the relationship between the flow of membrane and the MLSS concentration was studied and the result is that they are linear minus correlation.