城市污水处理厂污泥脱水性能研究

分别对城市污水处理厂产生的浓缩污泥、初沉池污泥和浓缩污泥的混合污泥以及消化污泥进行了絮凝脱水试验,同时对聚合硫酸铁(PFS)、丙烯酸钠-丙烯酸酰胺共聚物、异丁烯酸-甲基丙烯酸共聚物和阳离子聚丙烯酸胺(PAM)的絮凝效果进行比较。结果表明,浓缩污泥所需要的絮凝剂最少,消化污泥所需要的絮凝剂最多,并且各种絮凝剂都存在着最佳投加量。以浓缩污泥为例进行经济分析结果表明,最佳絮凝剂为PAM,最佳投加量为2.45kg/t干泥。另外,对絮凝脱水的影响因素分析后发现,过滤压力、pH以及搅拌速度都对污泥脱水性能有很大影响,在实际应用中应通过实验进行优化选择。

Sludge Dewatering Property in Municipal Wastewater , Treatment Plant

Dewatering characteristics of thickened sludge,mixed sludge and digestive sludge from municipal wastewater treatment plant through flocculation test was studied.Sludge dewatering behaviors of polymeric ferric sulfate(PFS),sodium acrylate-acrylamide copolymer,methacrylate-methacrylate copolymer and polyacry lamide(PAM) were compared.Results showed that thickened sludge need the least flocculant while digestive sludge need the most flocculant,with all the flocculants having optimum dosages.Based on flocculant effect and economic analysis,PAM was the best flocculant,with optimum dosage of 2.45kg/t(dry sludge).Filter pressure,pH of sludge and mixing speed greatly affected the flocculant effect,which should be selected carefully by test.