剩余污泥浓缩脱水投药量优化和模型建立

Dosage optimization and modeling of concentration and dehydration of surplus sludge

应用高分子阳离子絮凝剂(CPF-100)和聚丙烯酰胺(PAM)对污水厂剩余污泥进行浓缩脱水实验,研究表明:CPF-100的浓缩脱水效果优于PAM;当CPF-100投加量为1.16‰时,污泥沉降性能改善程度为37.51%;且在CPF-100投加量逐渐增大的初始阶段,污泥沉降性能改善程度随投加量的增加而增大,但CPF-100投加量也不宜过大,当CPF-100投加量超过1.16‰后,反而会使浓缩脱水效果变差。同时,建立了污泥沉降性能改善程度与絮凝剂CPF-100投加量、沉降时间之间的数学模型,其能较好地反映污水厂剩余污泥的浓缩脱水效果。

CPF-100 and PAM were used to improve the performance of surplus sludge concentration and dehydration in a wastewater treatment plant, and CPF-100 was better than PAM. When the dosage of CPF-100 was 1.16‰, the concentration and dehydration efficiency increased 37.51% than no coagulant. The perform- ance of concentration and dehydration increased with the beginning of CPF-100 dosage increase. However, when the dosage of CPF-100 was more than 1. 16‰, the concentration and dehydration performance worsened with an increase in the CPF-100 dosage. Moreover, a mathematical model was proposed and calibrated with the experi- mental data. The proposed model dealt with the relationship between the concentration and dehydration efficien- cy, CPF-100 dosage and settling time. The model was appropriate and feasible to describe the performance of surplus sludge concentration and dehydration in wastewater treatment plants.