Vol 2 Issue 3 July 2015-September 2015
Nilusha, RT, Dissanayake, DMHS, Fonseka, WRK
Abstract: This study was conducted to examine the nutrient removal efficiency of pilot scale Constructed Wetland (CW) designed to treat dairy wastewater. Two pilot scale fiber glass wetland units were constructed to function as Subsurface Horizontal Flow (SSHF) CWs. A gravel based medium was layered for inlets and outlets of each unit. Constructed Wetland bed was filled with sand and the upper layer was filled with compost: top soil mixture (1:2). Both units were planted with Schoenoplectus grossus (Giant bulrush).After establishing plants for three months, the treatment unit was saturated with seven Biochemical Oxygen Demand (BOD) loads of diluted and neutralized dairy wastewater ranging from 5g/m2d , 16g/m2d, 20g/m2d, 24g/m2d,33g/m2d, 48g/m2d and 186 g/m2d. Seven days were maintained as effective retention time under each BOD load. Control unit was maintained without the addition of dairy wastewater. Samples were collected from the inlets and outlets of each unit and analyzed for BOD, Chemical Oxygen Demand (COD),Total Nitrogen (TN) and Total Phosphorous (TP).Removal efficiencies of BOD, COD, TN and TP were calculated. The results of this study showed BOD removal efficiencies in the range of 30%-100%, COD removal efficiencies in the range of 75%-92%, TN removal efficiencies in the range of 40%-100% and for TP in the range of 0%-100% with respect to studied loading rates. Based on these results this paper suggests that this type of pilot scale SSHF CWs planted with Scheonoplectus grossus is appropriate for removal of BOD, COD, TN and TP in dairy wastewater arising from small and medium sector dairy industries.
Keywords: Constructed Wetlands, Dairy wastewater, Schoenoplectusgrossus, COD, BOD.
Title: PRELIMINARY STUDY ON NUTRIENT REMOVAL OF DAIRY WASTEWATER BY PILOT SCALE SUBSURFACE HORIZONTAL FLOW CONSTRUCTED WETLAND PLANTED WITH Schoenoplectus grossus
Author: Nilusha, RT, Dissanayake, DMHS, Fonseka, WRK
ISSN 2350-1049
International Journal of Recent Research in Interdisciplinary Sciences (IJRRIS)
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