In this study, experiments are conducted on leather tanning industry wastewaters to evaluate efficiencies of alternative schemes of physical-chemical treatment with regard to pretreatment standards. Carbonation and protein removal are employed in addition to sulfide oxidation, chromium precipitation, plain sedimentation and chemical precipitation. Two samples are used from two different tanneries processing cattlehide. Results indicate that carbonation and protein removal have little effect on COD. TKN removal in protein precipitation is about 20 %. Plain sedimentation is found to be as efficient as chemical precipitation for all parameters except chromium. However, as the results are evaluated with regard to pretreatment standards chemical precipitation is suggested to be the method of choice to meet the chromium as well as suspended solids and sulfide standards.

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