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Constructed Wetland


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Constructed Wetland

  1. 1. Constructed Wetlands a Novel initiative for Waste water treatment to attain Sustainable Environment Umang K Shaha, Anant Mitraa, Renuka Dharwarkara, J.S.Sudarsanb*,R.Annaduraib* aUnder Graduate student, SRM University, kattankulathur, Chennai 603203, India b*Faculty of Civil Engineering, SRM University, kattankulathur, Chennai 603203, India Presented by Umang K Shah, Anant Mitra
  2. 2. INTRODUCTION  The major environmental pollution is caused by improper disposal wastewater, due to the outflow of effluents from various areas of domestic and industrial sources.  This pollution also interferes with the growth of organisms living in the water bodies, thus retarding the natural purification process caused by such organisms.  Hence treatment of this water becomes very necessary.  Some of the suitable wastewater treatment processes for domestic wastewater include biological treatment processes, such as activated sludge, trickling filter, and rotating biological contractor systems.  The treated wastewater from these types of wastewater treatment plants might require further treatment with a tertiary treatment process, such as a constructed wetland (CW), to improve the treated wastewater quality.
  3. 3. CONSTRUCTED WETLANDS  Constructed wetlands are man-made wetlands built to remove various types of pollutants present in wastewater that flows through these systems. They are constructed to recreate the structure and function of natural wetlands. They possess a rich microbial community to effect the biochemical transformation of pollutants, they are biologically productive and most important, and they are self-sustaining. Lab Based Constructed Wetland Model
  4. 4. CWS on a pilot scale INLET ZONE  In the 20 litre plastic container was used to provide a continuous flow of wastewater through the inlet. WETLAND CELL  The pilot scale constructed wetland unit was a PVC container of length, width and depth of 70 cm, 40 cm, and 30 cm, respectively. It placed with slope 1% between inlet and outlet zones. The gravel with the size of 10-30 mm was put into the inlet and outlet zones in each cell in order to produce a uniform distributed flow. Moving Bed Bio Reactor (MBBR) was placed in the soil for bacterial growth. MBBR-FILTER MEDIA
  5. 5. FILTER MEDIA  The filter media consist of a sand bed underlain by a permeable layer. The bed was filled to a height of 7 cm with sand followed by a 7cm with gravel of diameter 10-30 mm. VEGETATION  Common Reed (Phragmites australis) and Common Cattail (Typha latifolia) are local wetland species, was used in the study. OUT FLOW  The outlet zone is filled with coarse gravel placed in the outlet of the constructed wetland to enhance effluent collection
  6. 6. METHOD OF COLLECTION OF SAMPLE  Domestic sewage water was collected from the sewage treatment plant present in the campus itself.  Dairy and leachate water is collected in accordance with APHA (American Public Health Association) guidelines.
  8. 8. Overall % of Removal Efficiency
  9. 9. RESULTS  The wastewater samples were analyzed in accordance to APHA 21st edition. The samples were studied for various parameters and the reduction percentages were noted down. The variation of the various parameters with respect to time are plotted in the Graphs. The analysis was carried out for the three types of wastewater and similar reduction percentages for the various parameters were observed. The preliminary studies revealed that water collected from outlet zone can be utilized for various purposes like irrigating fields, all domestic purposes except for drinking.
  10. 10. CONCLUSION  Constructed wetlands with horizontal sub- surface flow have successfully been used for treatment of domestic wastewater. The concentrations of parameters BOD, COD, TSS, TDS, TOC, Turbidity, N and PO4 in the influent of wastewater from sewage treatment plant in SRM University were studied with Normal constructed wetland and integrated constructed wetland setup. Constructed wetland was prepared on field scale and successful results were obtained. Field Scale Constructed Wetland Model at SRM University.
  11. 11. Working field scale model of Constructed Wetland at SRM University
  12. 12. REFERENCES  Atif Mustafa and Miklas Scholz (2010) ‘Nutrient Accumulation in Typha latifolia L. and Sediment of a Representative Integrated Constructed Wetland’, Water Air Soil Pollution Vol.219, pp.329–341.  Bhaskar, G. and Deeptha, V.T. (2009) ‘Treatment of Wastewater from Kitchen in an Institution Hostel Mess using Constructed Wetland’, International Journal of Recent Trends in Engineering, Vol.1, No.6, pp.54-58.  Chan, S.Y. and Tsang, Y.F. (2007) ‘Domestic wastewater treatment using batch-fed constructed wetland and predictive model development for NH3-N removal’, Process Biochemistry Vol.43, pp.297-305.  Gauss, Martin, Constructed Wetlands: A Promising Wastewater Treatment System for Small Localities: Experiences from Latin America (April 1, 2008). World Bank Policy Research Working Paper Series,
  13. 13.  Design Manual Constructed Wetlands and Aquatic Plant Systems for Municipal Water Treatment, (1998) United States Environmental Protection Agency Office of Research and Development, EPA/625/1-88/022  Healy, M.G. and Rodgers, M. (2006) ‘Treatment of dairy wastewater using constructed wetlands and intermittent sand filters’, Bio resource Technology Vol.98, pp.2268-2281  Jan Vymazala, and Lenka Kropfelovaa (2008) ‘Removal of organics in constructed wetlands with horizontal sub-surface flow: A review of the field experience’, Science of the Total Environment, Vol.407, pp.3911-3922.
  14. 14.  Srinivasan Neralla, and Richard W. Weaver (2000) ‘Improvement of domestic wastewater quality by subsurface flow constructed wetlands’, Bio resource Technology Vol.75, pp.19-25.  Suntud Sirianuntapiboon and Manoch Kongchum (2006) ‘Effects of hydraulic retention time and media of constructed wetland for treatment of domestic wastewater’, African Journal of Agricultural Research Vol. 1, No.2, pp.27-37.  Zhang, Letal (2010), effect of limited artificial aeration on constructed wetland treatment of domestic wastewater, Desalination Vol.250, No.3, pp.915-920
  15. 15. THANK YOU