Adsorption of chromium (VI) ion from leather industry waste waters

Alternative wastewater treatment methods are developed in recent years. One elimination method of heavy metals from the waste water is the adsorption of heavy metals. Cr (VI) is a heavy metal which is cause of water pollution and toxic effect on the living structures.In this study, the adsorption of Cr(VI) and removal of other polluted parameters was researched using natural adsorbents as clinoptilolite, activated clinoptilolite with asid, dolomite mineral and waste acorn of Quercus ithaburensis which was produced by valeks industries.The study consist of two experimental parts. In the first part, principal factors afffecting th adsorption were investigated. Suitable mix rate, pH, particular size of adsorban, concentration, amount of adsorban, temperature were invented and the optimum conditions were determined for chromium (VI) solutions.In the second part, adsorption tests were done with waste water under pre-determined optimum conditions for all the adsorban subtances. Experimental studies were taken place on removal of COD (Chemical Oxygen Demand), SS (Suspend Solid), BOD (Biological Oxygen Demand) and chromium (VI) from composite sample of the tannery waste water. The outputs of adsorption using clinoptilolit and activated clinoptilolit for COD, SS, BOİ and chromium(VI) respectively about %50, %55, %33, %80 was obtained.Key Words : Clinoptilolit, chromium(VI), tannery waste water, adsorption, dolomite.