Malaysian Applied Biology Journal

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47_05_02

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Malays. Appl. Biol. (2018) 47(5): 9–15

 

WATER QUALITY ASSESSMENT OF THE LANGAT RIVER,

SELANGOR


HASHIM, N.H.F.*, MOHD IDRIS, M.A., ABDULLAH, M., AHMAD TAJUDDIN, M.F., JAMALUDDIN, H.,

TREVOR GUNGGANG, R.A., MUHAZELI, M.F., ABDULLAH, N.S., KARIM, J.,

MOHAMED YUSOFF, M.A., HASHIM, N. and SHARIFUDDIN, S.S.


Makmal Kualiti Air, Institut Penyelidikan Hidraulik Kebangsaan Malaysia,

Kementerian Air, Tanah dan Sumber Asli (KATS), Jalan Putra Permai,

43300, Seri Kembangan, Selangor, Malaysia

*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

 

Accepted 4 October 2018, Published online 30 November 2018


ABSTRACT

An assessment on water quality and microbial contamination was carried out along Langat River, Selangor, Malaysia for every two months in 2016. Sampling site covers the entire trajectory along Langat River; one upstream point, four midstream points and one downstream point. Physiochemical parameters that were measured includes dissolved oxygen (DO), biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solid (TSS), ammoniacal nitrogen (AN) and pH according to the Standard Method of American Public Health Association 2005 (APHA 2005). Total coliform and Escherichia coli counts was determined using most probable number (MPN) method. Based on all parameter analysed, site P20 representing the midstream location with effluent discharge showed to be the most polluted compared to other stations. Out of six parameters, P20 recorded high concentration for four parameters; DO (0.52 mg/L), BOD (38.7 mg/L), COD (56 mg/L) and AN (10.97 mg/L). As for TSS, P25 showed highest concentration (522 mg/L) while lowest pH recorded at P5 (pH=5.05). P1 station located in upstream Langat river showed low concentration of all parameter analysed; BOD (0.1 mg/L), COD (0.2 mg/L), AN (0.1 mg/L), pH (8.47), TSS (0 mg/L) and DO (0.04 mg/L). Based on our calculation on WQI for Langat river, P1 (upstream) as Class I meanwhile other station located in midstream and downstream were categorised as Class II and III. This showed Langat river is moderately polluted and extensive treatment is needed prior usage for domestic purposes.

Key words: Water quality index, microbial contamination, Langat River

 

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