Treatment of Wastewater From a Beverage Factory Using the Activated Sludge Process
The activated sludge process although not popular in developing countries, can be useful in the treatment of high strength wastewater and when land cost is high. In the activated sludge process, secretions by bacteria entraps suspended solids to form dense aggregates which settle
under their weight to form sludge, part of which is recirculated. The objective of the study was to characterize the industrial wastewater from a beverage manufacturing plant and to assess the ability of the activated sludge treatment plant to remove key constituents. Influent wastewater from an equalization tank was channeled into a biological reactor, a primary clarifier and a secondary clarifier. The total average hydraulic retention time was 43.6 hours at a flow rate of 1704 m3/d. Influent BOD, COD, Total Nitrogen, Total Phosphorus, Total Suspended Solids, Total Dissolved Solids, iron were 687, 3085, 5.5, 80, 34, 4.2mg/L, respectively. Effluent concentrations of BOD, COD, Total Nitrogen, Total Phosphorus, Total
Suspended Solids, Total Dissolved Solids and iron from the second (final) clarifier tank were 2.4, 102.0, 1.0, 0.3, 13.9, 695.9 and 0.1mg/L, respectively, representing a removal efficiency of 99.7, 96.7, 81.3, 99.6, 58.8, 63.8 and 97.0%, respectively. All the parameters mentioned above met regulatory guidelines for discharge into water bodies.