SBR法处理工业废水中pH值引起的活性污泥上浮

用SBR法处理啤酒废水和化工废水时，进水pH值在5.0-10.0范围内，污泥活性基本正常，不出现污泥上浮；当进水pH值为2.5-5.0和10.0-12.0时，pH值越低（或越高），污泥活性受抑制越严重，上浮污泥量越多，出水的COD也越高。低pH值（3.5-7.0）的反应周期内控制pH值不变，两种废水的活性污泥在pH值≤5.5时就开始出现污泥上浮，上浮污泥量增多，且化工废水较啤酒废水污泥活性抑制和污泥上浮程度更加严重。在试验的pH值变化范围内（2.5-12.0)，两种废水处理系统中的污泥指数SVI≤150mL/g，镜检未见真菌和其它过量丝状菌。可见，用SBR法处理工业废水，过低或过高的pH值不一定引起污泥膨胀，而主要发生活性污泥的活性抑制和污泥上浮。

Floatation of activated sludge due to pH value during treatment of industrial wastewater by SBR

Sums up the findings that the activity of sludge was basically normal and no floatation appeared when the pH value of inlet wastewater was in the range of 5.0 to 10.0 the activity & flotation of sludge were seriously restrained and the content of COD in outlet water was higher when the pH was between either 2.5 to 5.0 or 10.0 to 12.0. The floatation of sludge started when the pH was less than 5.5 while pH was keet constant between 3.5 to 7.0. The SVI of the two kinds of wastewater were less than 150 mL/g and no excessive fungi & other filementous bacteria were observed through microscope when the experiment pH was between 2.5 to 12.0 and concludes that pH does not necessarily cause bulking of activated sludge but restraint of activity and floatation of sludge while it is either too high or too low.