Efficiency of Coagulation Process and Constructed Wetland for the Treatment of Municipal Solid Waste Landfill Leachate
Journal Title: Scholars Journal of Engineering and Technology - Year 2017, Vol 5, Issue 9
Abstract
Landfill leachate is a fluid that is from the external water which enter into the landfill solid waste, dissolve and rinse the dissolved materials including organic matter. It usually has high content of organic matter, electrical conductivity and high concentrations of nitrogen, toxic compounds and heavy metals. Hence, formation of landfill leachate threatens the public health and environment. Proper treatment of landfill leachate is therefore vital to remove hazardous components before discharge. Further, composition of landfill leachate varies from time to time and site to site. There are number of leachate treatment methods which have been used. Some methods are inefficient, and some are expensive and energy consuming and thus not suitable for many landfill sites, particularly in rural areas of developing countries. Assessment of available and affordable treatment methods for a particular landfill site is necessary to find out their efficiency in removing hazardous matters from the leachate. In this context, the present study was aimed to characterize the landfill leachate and to determine the efficiency of coagulation process and constructed wetland for the treatment of landfill leachate. Coagulation studies were performed with Alum and Calcium hydroxide at various doses to find the effect of coagulant type and its dose on removal of COD and turbidity. Constructed wetland vegetated with typhalatifoliawas used to assess its ability to remove COD, BOD5 and NH4-N. Landfill leachate was found to have high concentration of TDS, COD, BOD5 and NH4-N. It was observed that Alum can remove up to 50% COD at 15 g/l dose whilst Calcium hydroxide removes up to 75% COD at 20 g/l dose. More than 90% of turbidity could be removed by coagulation process using Alum and Calcium hydroxide. Constructed wetland removes more than 68% of COD, 70% of BOD5 and 50% NH4-N at seventh day of incubation. The removal efficiency increases with retention time. Keywords:Alum, Calcium hydroxide, coagulation, constructed wetland, landfill leachate
Authors and Affiliations
R. Thivyatharsan, M. Rajendran
Keywords
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