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Environments 2015, 2(3), 280-294; doi:10.3390/environments2030280

Alteration of Water Pollution Level with the Seasonal Changes in Mean Daily Discharge in Three Main Rivers around Dhaka City, Bangladesh

1
Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering for Research, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan
2
Department of Environmental Sciences, Jahangirnagar University, Dhaka-1342, Bangladesh
3
School of Bioscience, The University of Nottingham, Malaysia, Jalan Broga, 43500 Semenyih, Selangor, Malaysia
4
Group of Environmental Adaptation Science, Faculty of Environmental Earth Science Hokkaido University, Sapporo 060-0810, Japan
5
Environmental Health Sciences, Faculty of Health Sciences, Hokkaido University, Sapporo 060-0812, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Yu-Pin Lin
Received: 30 March 2015 / Revised: 27 May 2015 / Accepted: 4 June 2015 / Published: 26 June 2015
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Abstract

A study based on the physicochemical parameters and dissolved metals levels from three main rivers around Dhaka City, Bangladesh, was conducted in order to determine the present pollution status and their alteration trends with the seasonal change of discharge amount. The water samples were collected from the rivers Buriganga, Turag, and Shitalakkhya during both dry and monsoon seasons. Physicochemical analyses revealed that most of the water quality parameters exceeded the recommended levels set by the Department of Environment (DoE), Bangladesh, during both the dry and monsoon seasons. A very strong positive correlation was found between biochemical oxygen demand (BOD) and chemical oxygen demand (COD) in all sampling points. Both BOD and COD values had a strong negative correlation with dissolved oxygen (DO) in the Shitalakkhya River. Most of the dissolved metals concentrations in the water samples were similar. However, the concentrations of different physicochemical properties varied with the seasons. The dry season had significantly higher contamination loads, which were decreased during the monsoon season. Anthropogenic activities, as well as the variation in river water flow during different seasons were the main reasons for this high degree of water pollution. View Full-Text
Keywords: river water pollution; mean daily discharge; seasonal changes in pollution river water pollution; mean daily discharge; seasonal changes in pollution
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MDPI and ACS Style

Islam, M.S.; Uddin, M.K.; Tareq, S.M.; Shammi, M.; Kamal, A.K.I.; Sugano, T.; Kurasaki, M.; Saito, T.; Tanaka, S.; Kuramitz, H. Alteration of Water Pollution Level with the Seasonal Changes in Mean Daily Discharge in Three Main Rivers around Dhaka City, Bangladesh. Environments 2015, 2, 280-294.

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