Volume No. 7 Issue No.: 4A Page No.: 1565-1570 April-June 2013

 

REMOVAL OF POLLUTANTS FROM MUNICIPAL WASTE WATER IN SUB - SURFACE FLOW CONSTRUC -TED WETLANDS : EFFECTS OF VEGETATION

 

Gupta A. B., Jagwani Tushali*, Rampuria Aakanksha and Vijayvargia Prakash

Department of Civil Engineering, MNIT Jaipur, Jaipur (INDIA)

 

Received on : October 05, 2012

 

ABSTRACT

 

Wetland systems are recognised as one of the technologies that can be used in conjunction with traditional waste water treatment technologies as a cost effective wastewater management option in both developed and developing countries. In present study we have monitored the efficiency of Brahmpuri (vegetated) and unvegetated sub-surface horizontal flow type constructed wetlands in terms of five-day Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Nitrogen, Phosphorous. Dissolved Oxygen (DO) and conductivity were also measured. Average removal efficiency of wetland for BOD, COD, TSS, TKN were found 45.6%, 49.7%, 18.63 and 49.6 respectively. These constructed wetlands receives tertiary treated sewage water which is then finally discharged into the lake to maintain water losses of lake. Unvegetated wetland is found to be more efficient in removing BOD, COD, TSS and phosphorous. Vegetated system is more efficient than unvegetated system in removing nitrogen. Brahmpuri wetland is uncovered and lacks maintenance. Harvesting is not proper in vegetated wetlands due to which decayed plant litter falls back to the wetland increasing the organic load into the wetland. Small area and lower detention time are constraints in efficient working of these wetlands.

 

Keywords : Constructed wetlands, Contaminants, Domestic wastewater, Removal efficiency, Total N, Total P

 

 

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