Are polyaluminum chloride and polyelectrolyte composite coagulants effective in drinking water treatment?

Abdellah-Anouar. El Foulani, Mohamed. Tahiri & Polyaluminum chloride (PAC)/natural polyelectrolyte composite coagulants have received considerable attention recently due to their exceptional properties in drinking water treatment.

Do polyaluminum chloride coagulant characteristics affect dissolved residual aluminum concentrations?

In this study, the effect of polyaluminum chloride (PACl) coagulant characteristics on dissolved residual aluminum concentrations after coagulation and filtration was investigated. The dissolved residual aluminum concentrations at a given coagulation pH differed among the PACls tested.

Do coagulants increase aluminum concentrations in treated water?

1. Introduction Alum and polyaluminum chloride (PACl) coagulants are widely used at water treatment plants to remove turbidity and dissolved substances from water. However, concerns have been raised that the use of such coagulants may increase aluminum concentrations in treated water (Miller et al., 1984; Ohno et al., 2009).

Is polyaluminium chloride better than polyelectrolyte – alum-based coagulation?

At the Barekese Water Treatment Plant in Ghana, an alternative, the polyelectrolyte – polyaluminium chloride (PAC) is also used in coagulation but limited information is available on the operating conditions required to achieve better performance than alum-based coagulation.

Why are aluminum coagulants used in water treatment plants?

Aluminum coagulants are widely used in water treatment plants to remove turbidity and dissolved substances.

Which coagulation pH is a key to reducing residual aluminum concentration?

In their other data (Yan et al., 2007), 83%- and 73%-basicity PACls shows lower residual aluminum concentration than 53%-basicity PACl even though the coagulation pH values were slightly higher alkaline pH. Therefore, basicity >70% was suggested as a key for reducing residual aluminum concentration.