SUMMARY
Over the years, treatment of tannery waste-Water put a considerableburden on the total cost of production, be it pickled, in wet-blue, crust orfinished leather. After 1980 a very stringent regulation has been imposed on thequality and purity of the waste waters that go to the drain. The high amount ofmoney charged for effluent tannery waste-water, lead most of the tanneries toclose down with increasingly stringent environmental requirements, it hasbecome necessary to reduce the pollution load in waste-water to a minimum.This has been done by treating tannery waste-water biologically with expensiveundertaking as no income or revenue is obtained at the end. For these reasons,recycling of spent solutions from soaking through retannage has been applied inthis work with a considerable saving of 40% and 75%, chemicals and water, aswell as protection of the environment from these polluting chemicals ascompared with the standard process without recycling.The treatment of tannery waste-water is done through addition of the requiredmaterials to each process and recycling of the spent solution. After the process iscompleted the pelts are unloaded, the once-used solution is topped up with therequired make-up and reused. The process of recycling is repeated seven timesfrom one batch to another. By this method of recycling there will be saving inwater, chemicals and protection of the environment.The leather processed using recycled solution adjusted with a make-up showedcomparatively good physical and chemical properties. The tensile strengthobtained is acceptable, and the elongation at grain crack is very good, the load atgrain burst is also 200kg/cm2. The elongation at grain crack is equal to thetensile strength.In conclusion it is recommended to apply recycling of tannery used solutionsfrom soaking through retanning processes. The total cost will be reduced, thenthere will be saving in chemicals and clean environment