Statistical Analysis of COD and BOD Removal from Dairy Waste Water

Abstract

One of most water polluted industry is Dairy industry. It produces various milk products like milk powder, butter milk, curd, cheese, pasteurized milk etc. More amount of fresh water is used for different purposes i.e., cooling/heating, sanitary, processing, utilities and service section during milk processing and production of different milk products. It is observed from a report that for processing 1L of milk, the Dairy industries produce 2.5 to 10L of waste water. Major pollutants found in dairy waste water are Organic components like dissolved sugars, carbohydrates, proteins and fat are found as the major pollutants in the Dairy waste water. Apart from organic compound some inorganic compounds like Sulfur, Phosphorous and Nitrogen are also found. Hence, the dairy wastewater is having large amount of organic matter that can be measured in term of BOD and COD.  As it is having pungent odor and is responsible for fly generation, it should be treated properly before disposal. In this present work, the synthetic dairy waste water was prepared and was treated with activated carbon prepared from coconut shell collected from temple side. The activated carbon prepared from Coconut shell CGAC could be able to remove COD and BOD of the used water up to satisfactory level at different bed height and contact time. This paper shows the statistical analysis of COD and BOD using the activated carbon. In the experiment, the standard deviation of maximum removal efficiency of COD and BOD from the dairy wastewater was found as 0.59 and 0.49, respectively.