An alternative method for preparation of polyaluminum chloride coagulant using fresh aluminum hydroxide gels: Characterization and coagulation performance

Add time:08/11/2019    Source:sciencedirect.com

The drawbacks, high energy consumption, rigorous preparation condition and high impurity contents, have been well-recognized in the preparation of widely-used polyaluminum chloride via conventional methods in industrial scale. In order to overcome the drawbacks, the fresh aluminum hydroxide gels were proposed to prepare the polyaluminum chloride (PACG) in this study. The optimal preparation condition of PACG was obtained by optimizing the preparation conditions including temperature, time and acid concentration. The contents of the small/middle polymeric aluminum (Alb) in an optimized PACG could reach 80%. During preparation, high temperature significantly reduced the preparation time but led to a poor stability. Lower rate constants of reaction between hydroxyl-Al and Ferron, kb1 and kb2, were almost equal at high basicity value. It implied that the middle polymeric aluminum (Alb2) was dominant in Alb. Besides, the pseudo-first-order kinetics equation was rearranged. Coagulation by PACG2.0 was found to be the most effective for low-turbidity water treatment but limited to a narrowest optimum range of dosage compared with other PACG. The residual aluminum concentration of the water after coagulation by the PACG2.5 with fresh aluminum hydroxide gels was always low even overdosing. Charge neutralization was not the predominant coagulation mechanism in this treatment.

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