Editorial Type:
Article Category: Research Article
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Online Publication Date: 06 May 2013

Water-Pollution Study Based on the Physico-chemical and Microbiological Parameters of the Semenyih River, Selangor, Malaysia

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Page Range: 318 – 334
DOI: 10.5555/arwg.15.4.hn3076665801k728
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The Semenyih River is one of the most important rivers in Selangor, Malaysia, because it functions as a resource for domestic water supply, fishing, and recreation. It has been adversely affected by urban and industrial wastes since the early 1990s. This study assessed the contamination status of the Semenyih River based on the National Water Quality Standards for Malaysian rivers (NWQS) and the national Water Quality Index (WQI) classifications. Although 10 of the waterquality parameters were within the recommended levels for the NWQS, levels of phosphate (PO4), E. coli, and total coliform bacteria were found to exceed the threshold. The Semenyih River is polluted by human activities from its upstream section (contamination by E. coli, coliform bacteria, and PO4) and is therefore characterized as Class III based on NWQS classificationBased on WQI, the Semenyih River was classified as slightly polluted and placed in Class II for Malaysian rivers at all sampling stations except stations 5 and 7, which were more polluted and therefore classified under Class III. According to WQI, the river is suitable for recreation and permissible for body contact.

La rivière Semenyih est un des fleuves les plus importants de Selangor, Malaisie, car elle fonctionne comme une ressource pour l’approvisionnement en eau domestique, la pêche et les loisirs. Elle a été affectée par les rejets urbains et industriels depuis le début des années 1990. Cette étude évalue le degré de contamination de la rivière Semenyih en se basant sur les normes nationales de qualité de l’eau des rivières malaysiennes (NWQS) et sur l’indice de qualité des eaux (WQI). Bien que dix des paramètres de qualité de l’eau soient dans les niveaux recommandés pour les normes nationales, les phosphates et les bactéries E. coli et coliformes dépassaient le niveau de seuil. La rivière Semenyih est polluée par les activités humaines en amont (contamination par l’E. coli, les coliformes et les phosphates) et est pour cette raison cataloguée en classe III. Sur la base du WQI, la rivière Semenyih a été considérée comme légèrement polluée et cataloguée en classe II pour les rivières malaysiennes à toutes les stations d’échantillonnage, à l’exception des stations 5, 6 et 7, qui étaient plus polluées et ont été de ce fait cataloguées en classe III. Sur la base de cet indice, la rivière est apte aux loisirs et le contact corporel y est tolérable.

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