DOI: 10.36347/sjet

Pages: 133-139

Tannery industry is one of the large scaled industry which produces lot of organic wastes per day. Tannery effluents contain lot of hazardous elements which can affect human immunity when it is directly discharged in water bodies. Tannery waste water was collected and a novel approach of using natural coagulants and locally available commercial grade lime were used for coagulation and flocculation. The collected tannery waste water was basic in nature with ph of 8. Conductivity at 30˚c was found to be 98.5 mg/l. Transmittance is found to be 2% and other initial parameters like TDS, absorbance, turbidity, odor, color were also checked. 1N nitric acid is added at 15ml/l to the waste water for preservation. For coagulation and flocculation the ph was altered by using sulphuric acid and sodium hydroxide. Coagulation is done using natural coagulant moringa olifera and lime is used. The coagulants are aided with coagulant aid (polyelectryolyte) and some of the chemical coagulants like alum, ferrous sulphate, Ferric chloride and calcium chloride. The result was found to be effective in treating tannery waste waters. The initial parameters of the tannery waste water are reduced to satisfactory levels. Hence it is proven that natural coagulants and lime can be used for treatment of tannery waste waters