A study on the Water Quality Index (WQI) has been conducted among 11 rivers
in Penang Island, Malaysia from October 2012
to January 2013. The water quality status of rivers was classified based
on the Interim National Water Quality Standard (INWQS) for Malaysia. The six water
quality parameters used to determine the water quality index are dissolved oxygen
(DO), biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solid (TSS),
ammonia and pH value. Based on the WQI assessment, among the 11 rivers studied,
none of the rivers were considered as clean. The upstream and middle stream of the
Pinang River in Balik Pulau (with WQI = 69 and 70 respectively), the upstream and
middle stream of the Kongsi River (with WQI = 67 and 72 respectively) and the upstream
of the Betong River (with WQI = 63) were slightly polluted, while the rest of the rivers had a WQI of below 60, which were categorized
as polluted rivers. Among the 30 sampling stations, 17 stations were classified
as Class III (extensive treatment of water supply required; fish for common economic value, species tolerance, and for livestock
drinking), and 13 stations were classified
as Class IV water status, which was classified as irrigation according to
INWQS. From this study, the WQI and river classification system were considered
as a tool for assessing the health status of river water quality. Efficient and
sustainable management of rivers in Penang Island should be emphasized in order
to protect their aesthetic value for future generations.
Cite this paper
Nurul-Ruhayu, M. , An, Y. J. and Khairun, Y. (2015). Detection of River Pollution Using Water Quality Index: A Case Study of Tropical Rivers in Penang Island, Malaysia. Open Access Library Journal, 2, e1209. doi: http://dx.doi.org/10.4236/oalib.1101209.
Phillips, J.D. (1989) An Evaluation of the
Factors Determining the Effectiveness of Water Quality Buffer Zones. Journal of Hydrology, 107, 133-145. http://dx.doi.org/10.1016/0022-1694(89)90054-1
Farah Naemah, M.S., Nik Norulaini, N.A.R., Mohd Omar, A.K. and
Fatehah, M.O. (2000) Identification of Pollution Sources within the Sungai
Pinang River Basin. Project Report. Universiti Sains Malaysia, Penang, 478-485.
DOE (Department of
Environment) (2010) River Water Quality Monitoring. Department of Environment
Malaysia, Ministry of Science, Technology and the
Environment, Putrajaya.
Fulazzaky, M.A., Seong, T.W. and Masirin, M.I.M.
(2010) Assessment of Water Quality Status for the Selangor River in Malaysia. Water, Air and Soil Pollution, 205, 63-77. http://dx.doi.org/10.1007/s11270-009-0056-2
DID (Department of Irrigation and Drainage) (2009)
Study on the River Water Quality Trends and Indexes in Peninsular Malaysia. Department of Irrigation and Drainage, Ministry of Agriculture, Kuala Lumpur.
Lim, F.L. (2007) Comparison of Water Quality
Index (WQI) between DOE Method and Harkin’s Index. Ph.D. Thesis, Universiti Teknologi Malaysia,
Johor Bahru.
Hector, R.A., Manuel, C.C., Rey, M.Q., Ruben, A.S. and
Adan, P.M. (2012) An
Overall Water Quality Index (WQI) for a Man-Made Aquatic Reservoir in Mexico. International Journal of Environmental Research
and Public Health, 9, 1687-1698. http://dx.doi.org/10.3390/ijerph9051687
APHA (American Public Health Association)
(2012) Standard Methods for the Examination of Water and Waste Water. American
Public Health Association, Washington DC.
Ibrahim,
A.L. (2002) The Impact of Urbanization and
Industrialization on River Water Quality: A Case Study of Sungai Kluang, Bayan
Lepas, Pulau Pinang. In: Chan, N.W., Ed., River 99: Towards Sustainable
Development, Universiti Sains Malaysia, Penang, 192-193.
Nurul Ruhayu, M.R. (2011) The Impact of
Anthropogenic Activities and Other Related Factors on Water Quality of Tropical River, Pinang River, Balik Pulau, Penang. Impak Aktiviti Antropogendan Faktor yang Berkaitan Terhadap Kualiti Air Sungai Tropika, Sungai Pinang, Balik Pulau,
Pulau Pinang. M.Sc. Thesis, Universiti Sains Malaysia, Penang.
Nurul
Ruhayu, M.R. and Khairun, Y. (2012) Assessment of Nutrients and Sediment Loading in
a Tropical River System in Malaysia. International
Conference on Environment, Chemistry
and Biology, IACSIT,
Singapore, 49, 75-79.
Khairun, Y., Nur Munira, A., Nurul Ruhayu, M.R. and Arif
Chowdhury,
Md. (2012) Coastal Aquaculture Effluent Quality and Environmental Management
for Healthy Coastal Ecosystem—A Case Study of Pinang River, Balik Pulau
in Penang Island, Malaysia. Asia-Pacific Journal of Rural Development, 22,
1-10.
Azyana, Y., Nik Norulaini, N.A. and Nurul Jannah,
H. (2012) Land Use and Catchment Size/Scale on the Water Quality Deterioration
of Kinta River, Perak, Malaysia. Malaysian Journal of Science, 31, 121-131.
Cheong, H.L. (2007) Penaksiran Kualiti
Air di Muara Sungai Paya Bakau di Kawasan Balik Pulau. Assessment of Water Quality at the
Mangrove Estuary in Balik Pulau Area. B.Sc. Thesis, Universiti Sains
Malaysia, Penang.
Chaturvedi, M.K. and
Bassin, J.K. (2010) Assessing the Water Quality Index of Water Treatment Plant
and Bore Wells, in Delhi, India.
Environmental Monitoring and Assessment, 163, 449-453. http://dx.doi.org/10.1007/s10661-009-0848-2
Ramani Bai, V. (2009) Importance of Biological
Parameters of Water Quality to Reform Water Quality Index in Practice. Advances in Environment, Computational
Chemistry and Bioscience, 199-204.