Articles

  • BRIEF REVIEW OF AEROBIC BIOLOGICAL TREATMENT METHODS& THEIR DEVELOPMENT by AdministratorPosted on : 10 December 2010
    • Introduction
      The economical development and industrialization followed by urbanization in India are creating the problem of waste disposal arising from domestic and industrial activities. Treatment of industrial wastewater is compulsory by law. However untreated sewage is discharged into receiving water bodies. Urban areas are growing at the rate that is far more than capacity of local authority like Municipal Committee & Municipal Corporation for collection, treatment & disposal of sewage. This problem is very serious in the newly expanded urban areas.  
      Where sewerage system is laid down, sewage is collected & directly disposes off into receiving water bodies or treated by conventional treatment with physical & biological treatment units. The principle of conventional sewage / effluent treatment is based on removal or destruction of pollutant by physical, chemical & biological methods to bring down pollutant within permissible limits. Conventional treatment system requires Capital cost, Energy to operate system, Skill manpower & Maintenance cost for mechanical equipments.
      Earlier Treatment plants are put to satisfy rules & regulation. However in present context objectives are changing because of rising awareness & quality standard,  strict rules & regulation, change in characteristics of sewage due to change in quality of life, need of energy efficient system, need of reuse & recycling of wastewater & safe disposal to receiving water bodies.
      Conventional sewage/effluent treatment includes physical removal of solids simple technology like stabilization/oxidation pond to the complex module of activated sludge process. Stabilization ponds use natural purification system driven by solar energy coupled with photosynthesis by algae. Aerated lagoon, activated sludge & trickling filter requires electrically driven equipments to transfer oxygen to water