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The Poly aluminium chloride in general consume considerably less alkalinity than alum. They are effective over a broader pH range compared to alum and experience shows that PACl works satisfactorily over a pH range of 5.0 to 8.0.
Another important advantage of using polyaluminum chloride in water treatment processes is the reduced concentration of sulphate added to the treated water. This directly affects SO4 levels in domestic wastewater.
* Biodegradation
Non-degraded anionic polyacrylamide has been shown to he recalcitrant to microbial
degradation. This is probably related to the extremely high molecular weight, which
renders microbial attack very difficult. However, once the polymer has been degraded
through photolysis (i.e., the action of UV light), and the macromolecule broken down
into oligomers, it becomes bioavailable and is biomineralized.
* study using C14 labeling, designed to evaluate the potential to biodegrade anionic
polyacrylamide demonstrated that a combination of photolysis and microbial attack leads to natural attenuation of these polymers.
* Residual Monomers
We takes the utmost care to ensure that the constituent monomers (in this case acrylamide and sodium acrylate) are as completely reacted as possible during polymerization. However, technically unavoidable traces can and do remain in the finished polymer, especially in powder products.