Can red mud be used to synthesise polyaluminium ferric chloride (PAFC) flocculant?

Red mud was used to synthesise polyaluminium ferric chloride (PAFC) flocculant. The COD and TOC of PAFC to landfill leachate were 72.2% and 82.6%, respectively. PAFC have advantages over commercial PAFC in settlement velocity and TOC removal efficiency. In this study, red mud was used as a raw material to extract Al and Fe using hydrochloric acid.

Can red mud extract al and Fe using hydrochloric acid?

In this study, red mud was used as a raw material to extract Al and Fe using hydrochloric acid. A highly efficient polyaluminium ferric chloride (PAFC) flocculant was prepared by adjusting the pH of a leaching solution, the molar ratio of Al to Fe, and the polymerisation temperature.

How is a polyaluminium ferric chloride flocculant prepared?

A highly efficient polyaluminium ferric chloride (PAFC) flocculant was prepared by adjusting the pH of a leaching solution, the molar ratio of Al to Fe, and the polymerisation temperature. The effects of synthesis and flocculation conditions on the flocculation performance of aged landfill leachate were investigated.

Is polyaluminum chloride a promising coagulant?

Among different coagulants, polyaluminum chloride (PACl) is considered to be a promising agent for the coagulation process, which exhibits excellent coagulation performance in previous reported studies , .

What is red mud?

Introduction Red mud (RM) is a strong alkaline solid waste that is discharged during the production of alumina using the Bayer process. At present, approximately 1.0–1.5 t of RM is generated in the production of 1 t of alumina, mainly in terms of the characteristics and production process of bauxite (Khairul et al., 2019).

Are composite flocculants environmentally friendly?

Composite flocculants can overcome the deficiency of a single flocculant and produce the synergistic effect of multiple flocculants, therefore becoming a new generation of environmentally friendly flocculants (Deng Bowen et al., 2020). In recent years, there have been many studies on treating landfill leachate with composite flocculants.