ABSTRACT
The tannery industry is considered to be a vital industry from economic point of view. But its wastewater is an important source of water pollution as it contains high concentration of both organic and inorganic pollutants. Disposal of such untreated wastewater is a serious environmental threat. It is therefore necessary to treat this wastewater before the final disposal. In this research work, coagulation and flocculation followed by biological treatment is used to treat the wastewater of tannery. Potash alum was used for coagulation and Drewfloc 270 was used for flocculation. Different dose rates of coagulant and flocculent were adjusted and their effects on different parameters were observed. It was concluded that this treatment method was found successful in reducing the pollutant concentration of the tannery effluent to achieve National Environmental Quality Standards (NEQS).
