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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Abstract

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.

Item Type: Article
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 2735
Depositing User: Devika Mohan
Date Deposited: 27 Aug 2009 08:56
Last Modified: 06 Oct 2015 17:01
URI: http://eprints.mdx.ac.uk/id/eprint/2735

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