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.

How to treat leachate through coagulation-flocculation?

A study was conducted to treat the leachate through coagulation-flocculation. Polyaluminium chloride (PAC) was used as coagulant with cationic and anionic polymers as coagulant aids. The results were subsequently compared with the study in which PAC was used alone for the treatment. Jar test apparatus was used to conduct research work.

What is the optimal pH range for Pac coagulation?

The optimal pH range for PAC coagulation performance was 7.5 to 8.0. The coagulation process in conventional water treatment could be enhanced and the ensuing water pH decline reduced appreciably by applying the right dosage of polyaluminium chloride and appropriate process conditions of pH, fluid mixing speed matrix and residence time.

Can polyaluminum chloride be used as an alternative to Alum?

Therefore, The researchers worked on polymeric aluminum termed polyaluminum chloride (PAC) that could be used as an alternative for alum proposed for drinking water treatment (Zouboulis et al., 2008).

What coagulants are used in water treatment?

There are many types available commercially coagulants such as of polyaluminum that used for the treatment of water and wastewater nominated as PAC and aluminum sulphate (AS). Consequently, the use of polymers leads to higher effective density (floc densification) and thereby improved sedimentation velocity.

How effective is the coagulation process in water treatment?

The main factor in the efficacy of the coagulation process in water treatment is the removal of turbidity. Preliminary jar test was carried out to determine the optimum dose for five coagulants (Al (SO 4) 3, CST (0.34, 0.85, 0.97) and PAC (yellow and white).