Study on the effects of organic matter characteristics on the residual aluminum and flocs in coagulation processes

Hui Xu , Dawei Zhang , Zhizhen Xu , Yanjing Liu , Ruyuan Jiao , Dongsheng Wang


Received August 21, 2016,Revised October 26, 2016, Accepted November 18, 2016, Available online January 04, 2017

Volume 30,2018,Pages 307-317

Characteristics of organic matter may affect the residual aluminum after the coagulation process. This study reported the results of a survey for one drinking water treatment plant and measured the concentration of residual aluminum species with different molecular weights. Survey results indicated that humic acid or organic matter whose molecular weight was smaller than 1500 Da had significant effects on residual aluminum. All the treatment processes were ineffective in removing dissolved organic matter whose molecular weight was smaller than 1500 Da. These results also indicated that the addition of sand or polyacrylamide in the coagulation process could greatly decrease the concentration of humic acid, and the concentration of residual aluminum also decreased. These results revealed that for all water samples after filtration, the majority of total residual aluminum existed in the form of total dissolved aluminum, accounting for 70%–90%. The concentration of residual aluminum produced in bovine serum albumin solutions indicated that when the DOC was larger than 4.0 mg/L, there were still significant differences when the solution pH value varied from 4.0 to 9.0.

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