Removal of pollutants by enhanced coagulation combined PAC with variable charge soils: flocs' properties and effect of pH. Issue 18 (16th September 2016)

• Record Type: Journal Article
• Authors: Wang, Yu-Jie; Wu, Chun-De; Duan, Yan; Zhang, Zhi-Lin
• Is Part Of: Environmental technology. Volume 37:Issue 18(2016)
• Page Start: 2273
• Page End: 2280
• Publication Date: 2016-09-16
• Subjects: Enhanced coagulation -- flocs property -- removal -- variable charge soil -- PAC; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2016.1147611
• Languages: English
• ISSNs: 0959-3330

Abstract

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.