Study on coagulation effects of PAC and PAFC on urban rainwater treatment

Author

Hao Yang ; Xianqiang Chen ; Fuping Wu ; Zhifang Yue ; Qunshu Zhu ; Xiang Yan

Author_Institution

Sch. of Environ. & Municipal Eng. & Inst. of Environ. Ecology, Lanzhou Jiaotong Univ., Lanzhou, China

fYear

2012

fDate

19-21 Oct. 2012

Firstpage

1

Lastpage

4

Abstract

The coagulation tests for simulated urban rainwater were performed using PAC and PAFC respectively. The influences of coagulant type, dosage and pH of raw water on the coagulation effect were investigated. The results show that under the conditions of the fast stirring rate of 200 r/min(1 minute), the middle stirring rate of 150 r/min(5 minutes), low stirring rate of 50 r/min(15 minutes), the optimum dosage of PAC is 40ml/L, the optimum dosage of PAFC is 60ml/L. There is no significant difference in coagulation effect between PAC and PAFC. Taking cost into account, PAC was recommended. When the pH ranges from 6.5 to 7.5, the coagulation efficiency of PAC is better. When PAC dosage is 40mg/L and pH of raw water is 7.0, the removal rate of turbidity, ammonia nitrogen and CODcr was 98.14%, 18.05% and 47.46%, respectively.

Keywords

coagulation; rain; water pollution; water treatment; PAC coagulation effect; PAFC coagulation effect; ammonia nitrogen; coagulation tests; raw water pH; stirring rate; turbidity removal rate; urban rainwater treatment; Aluminum; Coagulation; Instruments; Nitrogen; Water pollution; Water resources; PAC; PAFC; coagulation; urban rainwater;

fLanguage

English

Publisher

ieee

Conference_Titel

Geomatics for Integrated Water Resources Management (GIWRM), 2012 International Symposium on

Conference_Location

Lanzhou, Gansu

Print_ISBN

978-1-4673-1283-7

Type

conf

DOI

10.1109/GIWRM.2012.6349634

Filename

6349634