微生物絮凝剂改善城市污水厂浓缩污泥脱水性能的研究

Study on application of bioflocculant to improvement of thickened sludge dewaterability in municipal wastewater treatment plant

采用酱油曲霉（Aspergillus sojae）产生的微生物絮凝剂（MBF）作为污泥絮凝脱水剂，对城市污水处理厂浓缩污泥进行调理，确定该絮凝剂对浓缩污泥脱水的处理工艺参数为：微生物絮凝液最佳投加体积为6％-8％（体积比），发挥絮凝作用的最适污泥温度为28～32℃，最适pH为6～7。经微生物絮凝剂调理的污泥在3000r／min离心9min，污泥脱水率高达82．7％，滤饼含水率降低至77．3％，污泥脱水后体积减至原来的1／5左右。

The bioflocculant from Aspergillus sojae was sewage plant and its most preferred working conditions were used to improve sludge dewaterability in municipal 6% - 8% （V/V） dosage of bioflocculant, sludge temperature 28 - 32 22 , pH 6 - 7. Through eentrifugation （3 000 r/min, 9 min） , the sludge dewatering rate got to 82.7% and water ratio of fihered solid was decreased to 77.3% with only 1/5 volume of untreated sludge.