Does polyaluminium chloride improve phosphorus treatment efficiency?

Preliminary lab-scale studies were conducted to evaluate the efficiency of polyaluminium chloride (PAC) in the removal of phosphate-P (PO4-P) from swine wastewater. The experimental objective was to increase the phosphorus treatment efficiency in constructed wetland by adding PAC as a precipitating agent.

Does polyaluminium chloride remove phosphate-P from swine wastewater?

These particular wetlands have been treated with swine wastewater every year since the first application in 1997. Preliminary lab-scale studies were conducted to evaluate the efficiency of polyaluminium chloride (PAC) in the removal of phosphate-P (PO4-P) from swine wastewater.

Why is aluminum sulfate replaced by poly-aluminum chloride?

Aluminum sulfate and ferric chloride with low molecular weights are gradually replaced by the new aluminum salt coagulant, poly-aluminum chloride (PAC), due to the lower concentration of PAC under the same water quality conditions, the better adaptability to the pH of raw water, and the larger amount of generated PACS ( Gao et al., 2003 ).

Does PACs remove phosphorus?

As an aluminum-containing compound, PAC forms a polymeric cation after its addition to raw water, and its coagulation mechanism is similar to that of alum sludge. Therefore, assuming that PACS also has a strong removal effect on phosphorus is reasonable. This study mainly investigated the characteristics of adsorption of phosphorus by PACS.

Does alum sludge remove phosphorus?

Babatunde et al. (2009) found that when the pH value increased from 4.0 to 9.0, the adsorption capacity of alum sludge for phosphorus decreased from 31.9 to 10.2 mg/g. Other researchers have used other types of alum sludge to study phosphorus removal ( Guan et al., 2005; Park and Polprasert, 2008; Razali et al., 2007 ).

Does sulphide increase biological phosphorus removal?

Long-term effects of sulphide on enhanced biological phosphorus removal from wastewater: The symbiotic role of Thiothrix caldifontis (Water Environ. Res., 2003). In this study, the presence of sulphide increased biological phosphorus removal from wastewater by biomass with different phosphorus contents.