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.

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.

Are PAFC flocculants used in industry?

PAFC flocculants are typically used in industry. Furthermore, some research indicates that there is little residual Al and Fe in aquatic solutions left after PAFC treatments (Yan et al., 2016).

What is the optimum polymerisation temperature for PAFC flocculants?

The results confirmed that PAFC flocculant prepared at a polymerisation pH of 2.5, Al/Fe molar ratio of 8, and polymerisation temperature of 70 °C had the optimum effect. The effect of PAFC and commercial polyaluminium ferric chloride flocculants used under different flocculation conditions were compared.

Can a PAFC flocculant be used for wastewater treatment?

Based on these results, it can be concluded that a PAFC flocculant has significant potential for use in the pre-treatment and purification of wastewater. Table 1. Comparison of the effects of different flocculants for wastewater treatment.

What is pfasic flocculant used for?

Niu et al. (2011) graphite roasted and purified acidic and alkaline wastewater and used them as raw materials to prepare polyaluminium ferric silicate composite (PFASiC) flocculants; they obtained a COD removal efficiency of 90.8% under optimal conditions. PAFC flocculants are typically used in industry.