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Published on: February 10, 2021
Removal of pollutants by enhanced coagulation combined PAC with variable charge soils: flocs' properties and effect
Yu-Jie Wang1, Chun-De Wu1,2, Yan Duan1
1a School of Environment and Energy , South China University of Technology , Guangzhou , People's Republic of China.
Abstract:
This study investigated the properties of flocs and effects of the solution pH on removal of representative pollutants by enhanced coagulation with variable charge soils of South China and polyaluminum chloride (PAC). The results demonstrated that the removal efficiency of turbidity was larger and the aggregated flocs had a faster growth rate, bigger size, denser structure and faster settling rate than those generated by PAC alone, when variable charge soil was used in conjunction with PAC. Additionally, initial solutions pH had meaningful effects on removal of pollutants. With the increase in the pH of the solution, the removal efficiencies of turbidity, algae and heavy metal ions significantly increased. Besides, charge neutralization together with physical entrapment of colloids was the dominant mechanism in enhanced coagulation, and variable charge soil displayed a great adsorption effect.
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