Coagulation of micro-polluted Pearl River water with IPF-PACls

Article type: Research Article

Authors: XU, Yi | SUN, Wei | WANG, Dong-sheng | TANG, Hong-xiao

Affiliations: SKLEAC, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: Water samples collected from early March 2001 to the end of April 2002 at the branch of Pearl River around the Guangzhou City were analyzed for its micro-polluted characteristics. The coagulation behavior of polyaluminum chlorides (PACls) was then examined focusing on the effect of primary water quality and speciation distribution. The results showed that PACls exhibit better coagulation efficiency than alum in accordance with the different speciation.The turbidity removal property of PACls is evidently better than alum at Iow dosage. While in neutral zone (about 6.5–7.5), the turbidity removal of PACls decreases owing to the restabilization of particles at higher dosage. The organic matters in raw water exhibit marked influence on coagulation. In acidic zone, organic matters complex with polymer species and promote the formation of flocs. With an increase in pH, the complexation of organics with polymer species gradually decreases, and the removal of organics mainly depends on adsorption. The effect is evidently improved with the raise of B value.

Keywords: PACl, micro-polluted river water, DOC, coagulation efficiency

Journal: Journal of Environmental Sciences, vol. 16, no. 4, pp. 585-588, 2004