煤炭浮选剂对污泥深度脱水的作用
Effect of Coal Flotation Agent on Sludge for Deep Dehydration

对剩余活性生活污泥进行脱水过程中，本文避免常规使用的石灰、氯化铁等无机调理剂因投入量需求大和后续有二次污染等问题的出现，利用煤炭浮选剂的物理化学特性，通过联合使用阳离子聚丙烯酰胺对佛山市某生活污水处理厂的活性污泥进行调理实验。从浊度、毛细吸水时间、压滤拿捏困难度和含水率这四方面来分析调理效果，发现煤炭浮选剂对浊度没有改善，但对毛细吸水时间、拿捏困难度、含水率均有所改善，而且随着投加量的增加，改善的效果越明显，对污泥深度脱水具有较好的作用。煤炭浮选剂的投加量为15%时，CST从51.5 s降为25.3 s；拿捏困难度从100%降为70%，含水率从82.51%降为74.78%。
In the process of dewatering the surplus activated domestic sludge, this paper avoided the problems of large input demand and subsequent secondary pollution of conventional inorganic conditioners such as lime and ferric chloride, and used the physical and chemical characteristics of coal flotation agent to conduct conditioning experiments on the surplus activated sludge from a domestic sewage treatment plant of Foshan through the combined use of cationic polyacrylamide. The conditioning results were analyzed from four aspects of turbidity, capillary sunction time (i.e. CST), difficulty of filter pressing and water content. It was found that the coal flotation agent did not improve the turbidity, but improved CST, the difficulty of kneading and the water content. With the increase of the dosage, the more obvious the improvement, which had a good effect on the deep dehydration of sludge. When the dosage of coal flotation agent was 15%, CST decreased from 51.5 s to 25.3 s; the difficulty of kneading was reduced from 100% to 70%, and the water content was reduced from 82.51% to 74.78%.