Reasons leading to yellowing of activated sludge in sewage station and turbidity of supernatant and treatment method Cause of yellowing of activated sludge in sewage station and turbidity of supernatant Reason and treatment method Some wastewater treatment station has encountered some problems during the commissioning process. Of the waste water is a more complex, are different industrial waste water, water quality can not guarantee stability. At present, the problem encountered is that the sludge has been gray before the biodegradation process of emulsion wastewater in the process of commissioning, but the treatment effect is very good. But recently turned yellow, I thought the effect is better, but found that the supernatant is yellowish turbidity, even after filter paper with a little turbidity, pH 7 or so, the sludge SV measured the next 30 minutes, 80% And recently there are simple tests, the supernatant added sulfuric acid silver sulfate, but there will be a lot of white turbid objects. Therefore, the sewage treatment station staff guess should be caused by high chloride, also from the source asked whether the phenomenon of filter water purification sludge bulging. Today, the filter source water purification analysis will be conducted to explain the above problems, the following for your reference. Customer Problems - Analysis: In fact, the yellowing of the sludge may be caused by sludge aging sludge bulking, may also be due to the high chloride content of microbial death caused by the death of mud run-up expansion. Because it is an unstable industrial wastewater, water quality impacts the stability of biochemical systems. So both are possible. In addition, the need to observe whether the domestication of the load rise too fast, and then, acclimation of the supernatant turbidity is normal, after all, immature sludge, poor settlement, in order to control the run-up mud can be more settlement for a while. There is no need to add iron coagulation temporarily, because the sludge sludge floating when the death of microorganisms is also obvious Sludge swell refers to the extremely loose structure, the volume increases, floating, difficult to sedimentation separation affect the water quality phenomenon. According to the above problems, SV30 showed a steady growth trend, climbing to more than 80%, and has been high, showing a serious phenomenon of sludge expansion. Filter water purification to give solution to the measures: 1, lack of dissolved oxygen, increase aeration. 2, lack of nutrition, increase N, P content. 3, control the amount of water.