BOD AND COD REDUCTION FROM SYNTHETIC SUGAR INDUSTRY WASTEWATER

Environmental Engineering

Rapid progress made in industrialization without adequate environmental safety measures lead to pollution of water, which in turn, results in lack of good quality water both for irrigation and drinking purposes. The sugar industry wastewater contains huge amount of Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) which are harmful to the environment. Therefore, wastewater from sugar industry has to be treated before being discharged into the environment. The removal of BOD and COD from wastewater using adsorption process provides an alternative treatment. This study involved the reduction of BOD and COD in synthetically prepared sugar industry wastewater by the process of adsorption using rice husk and garlic peel as adsorbents. In this study both adsorbents were studied for their adsorption capacities from wastewater. Various parameters such as pH, contact time, adsorbent dosage and initial concentration were varied and analysis for BOD and COD were carried out. And also the adsorption isotherm studies are carried out. The result shows that both adsorbents are very effective for wastewater treatment. The maximum adsorption capacity of rice husk was found to be 76.8% in COD reduction and 82.7% in BOD reduction at neutral pH. Similarly the maximum adsorption capacity of garlic peel was found to be 66.3% in COD reduction and 66% in BOD reduction at neutral pH. The performance of rice husk and garlic peel adsorbents is good at the pH in between 6 and 10. The optimum contact time is 30 minutes and optimum adsorbent dosage is 0.5 gram for the reduction of COD for both the adsorbent. Similarly the optimum contact time is 30 minutes and adsorbent dose is 1 gram using rice husk and the optimum contact time is 45 minutes and adsorbent dose is 1.5 gram using garlic peel for the reduction of BOD. Optimum concentration is the lowest concentration of 100 mg/l for all the experiments. When comparing both the adsorbents, rice husk has high removal efficiency than garlic peel at same operating conditions.

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