Enhanced Coagulation on Micro-Polluted Raw Water by Attapulgite Clay and PAC Combination Process
Attapulgite clay and Poly aluminum chloride (PAC) combination process was adopted for enhanced coagulation on micro-polluted raw water, TOC and NH3-N served as water quality indexes. Results showed that, when the dosage of PAC was 15 mg/L and the dosage of attapulgite clay after 350 °C heat modification was 200 mg/L, the removal rates of TOC and NH3-N reached 82.5% and 75.3% respectively under optimal cogulation conditions, which increased by 72.2% and 230.3% respectively compared with traditional PAC process, and spared 1/4 of PAC dosage. Attapulgite clay and PAC enhenced process reflected advantages of low cost, easy handling, high removal rate, accelerated settlement, sludge reduction, less residual aluminium, chemical and biological safety, and so on. Its application in water supply treatment field was in good prospect.
Jinsheng Liang and Lijuan Wang
H. Han et al., "Enhanced Coagulation on Micro-Polluted Raw Water by Attapulgite Clay and PAC Combination Process", Advanced Materials Research, Vol. 178, pp. 137-142, 2011