Biological Unit operation for waste water treatment: Aerobic Process

Abstract

Dairy is one of the major industries causing water pollution. Considering the increased milk demand, the dairy industry in India is expected to grow rapidly and have the waste generation and related environmental problems are also assumed increased importance. Poorly treated wastewater with high level of pollutants caused by poor design, operation or treatment systems creates major environmental problems when discharged to the surface land or water. Aerobic biological treatment methods depend on microorganisms grown in an oxygenrich environment to oxidize organics to carbon dioxide, water, and cellular material. activated sludge is used to indicate the sludge which is obtained by settling sewage in presence of abundant oxygen. The activated sludge is biologically active and it contains a great number of aerobic bacteria and other microorganisms which have a got an unusual property to oxidize the organic matter. The activated sludge process has been employed extensively throughout the world in its conventional form and modified forms Various unit operations like physical, chemical and biological can play vital role in reduction of the waste water. Aerobic treatment of biological waste water like activated sludge, trickling filter, RBC, aerated lagoon with advance aerobic treatment unit SBR and summery of aerobic treatment unit with advantages and disadvantages are to be discussed in article.