Nutrient removal in a combined system: vertical vegetated bed over horizontal flow sand bed.
Shutes, R. Brian E. and Kantawanichkul, S. and Neamkam, P. (2001) Nutrient removal in a combined system: vertical vegetated bed over horizontal flow sand bed. Water Science and Technology, 44 (11). pp. 137-142. ISSN 0273-1223
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Pig farm wastewater creates various problems in many areas throughout Thailand. Constructed wetland systems are an appropriate, low cost treatment option for tropical countries such as Thailand. In this study, a combined system (a vertical flow bed planted with Cyperus flabelliformis over a horizontal flow sand bed without plants) was used to treat settled pig farm wastewater . This system is suitable for using in farms where land is limited. The average COD and nitrogen loading rate of the vegetated vertical flow bed were 105 g/m2.d and 11 g/m2.d respectively. The wastewater was fed intermittently at intervals of 4 hours with a hydraulic loading rate of 3.7 cm/d. The recirculation of the effluent increased total nitrogen (TN) removal efficiency from 71% to 85%. The chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN) removal efficiencies were 95% and 98%. Nitrification was significant in vertical flow Cyperus bed, and the concentration of nitrate increased by a factor of 140. The horizontal flow sand bed enhanced COD removal and nitrate reduction was 60%. Plant uptake of nitrogen was 1.1 g N/m2.d or dry biomass production was 2.8 kg/m2 over 100 days.
|Research Areas:||Science & Technology > Environmental Science|
|Deposited On:||27 Aug 2009 08:56|
|Last Modified:||06 Feb 2013 11:53|
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