Authors: Njau, K.N.; Renalda, M.

Source: Canadian Journal of Civil Engineering, Volume 37, Number 3, March 2010 , pp. 509-514(6)

Publisher: NRC Research Press

Abstract:

A horizontal subsurface flow constructed wetland (HSSFCW) was employed to remove tannins from the effluent of a tannins extracting company. Two HSSFCW cells with hydraulic retention time (HRT) of 9 d and packed with limestone were used. One cell without macrophytes was used as a control, while the second cell was planted with Phragmites mauritianus. Results indicated that HSSFCW was capable of treating tannin wastewater that has been seeded with primary facultative pond sludge. Tannins and chemical oxygen demand (COD) removal efficiency of 95.9% and 90.6% with outlet concentration of 27 mg/L and 86 mg/L, respectively, were obtained in the planted cell; while the tannins and COD removal efficiency of 91.1% and 89.5% with outlet concentration of 57 mg/L and 96 mg/L, respectively, were obtained in the control cell.

Un marécage artificiel à circulation horizontale sous surface (HSSFCW) a été utilisé pour éliminer les tanins de l'effluent d'une compagnie d'extraction des tanins. Deux cellules de HSSFCW remplies de calcaire et ayant un temps de rétention hydraulique de neuf jours ont été utilisées. Une cellule ne contenant pas de macrophytes a été utilisée comme contrôle alors que du Phragmites mauritianus a été planté dans la seconde cellule. Les résultats montrent que le HSSFCW peut traiter les eaux usées de tanins ensemencées de boues primaires de lagunes à microphytes. Des efficacités d'élimination des tanins et de la demande chimique en oxygène (DCO) respectives de 95,9 % et de 90,6 % avec des concentrations à la sortie de 27 mg/L et de 86 mg/L ont été obtenues dans la cellule plantée, alors que des efficacités d'élimination des tanins et de la demande chimique en oxygène (DCO) respectives de 91,1 % et de 89,5 % avec des concentrations à la sortie de 57 mg/L et de 96 mg/L ont été obtenues dans la cellule de contrôle.

Document Type: Research article

Publication date: 2010-03-01

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• Published since 1974, this monthly publication is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structure engineering, construction engineering, engineering mechanics, and engineering materials, and a history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academe. New developments in engineering design and construction are also featured.
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