Dairy wastewaters are characterized by high BOD and COD values due to fats, nutrients, lactose, detergents, sanitizing agents, casein and inorganic salts. It is estimated that about 2% of total milk processed is wasted into drains [12] and [14]. The reduction of BOD can result in simultaneous reduction of coliform populations [50]. Yathavamoorthi et al. [51] measured a positive correlation of fecal coliform with BOD than with suspended solids and suggested that adsorption of fecal coliforms may be more important than sedimentation. Though high growth of microbes had consumed the oxygen present in the treatment column, continuous and excess of aeration had proved to be an important reason for the reduction of BOD in the first treatment column. The removal of organic matter and nutrients from the wastewater is an important aspect of biological treatment. Varied types of bacteria and microorganisms require oxygen to consume the organic matter which results in multiplication and overgrowth in the form of sludge, also referred as activated sludge. The activated sludge contains living and dead biomass along with organics and minerals.