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Investigation of Water Quality from Bangshi River at Tangail in Bangladesh

MAUSUMI REHNUMA
Department of Environmental Science and Resource Management,Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

MD. SIRAJUL ISLAM*
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

NOWARA TAMANNA MEGHLA
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

MD. HUMAYUN KABIR
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh

Abstract/ Executive Summary:

The study was conducted to investigate the water quality parameters of the Bangshi River at Mirzapur upazila in Tangail district, Bangladesh during July 2015 to February 2016. The water samples were collected from three different stations indicated as St-1 (Mirzapur municipality), St-2 (Gorai) and St-3 (Ajgana), during dry and wet seasons to analyze water temperature, total dissolved solids (TDS), electrical conductivity (EC), pH, dissolved oxygen (DO), biochemical oxygen demand (BOD) and alkalinity. The mean temperature, TDS, EC, DO, BOD, pH and alkalinity of the Bangshi River water were found 31.65 and 20.2°C, 102.0 and 484.5 ppm, 145.0 and 820.5 μS/cm, 4.20 and 2.35 ppm, 3.8 and 6.4 ppm, 7.74 and 8.12, and 109.0 and 293.9 ppm in dry and wet seasons, respectively. The study revealed that the water temperature was highest in the wet season and lowest in the dry season. During the dry season, the TDS was highest and gradually decreased to the wet season. The EC and pH were found within the standard limit over the both wet and dry seasons. The DO and BOD content were not suitable for fisheries whereas alkalinity was suitable for fisheries during dry and wet seasons. The river water is not suitable for the aquatic environments as well as for fish culture. However, to maintain a sound and healthy aquatic environment of the Bangshi river appropriate steps should be taken immediately.

Keywords: Bangshi River, Water quality, Physicochemical parameters

Location: Bangshi River at Mirzapur upazila in Tangail district, Bangladesh

Start Date: 00-07-2015

End Date: 00-02-2016

Program Area: Crop-Soil-Water Management

Commodity: Water quality

Objectives:

The present study was an attempt to investigate the present status of physicochemical parameters of the Bangshi River in relation to observe the seasonal variation and to compare the observed values with water quality standard for aquatic environment as well as for fisheries.

Methodology:

Study Area: The study was conducted in the Bangshi river at Mirzapur upazila of Tangail district, Bangladesh during the period from July 2015 to February 2016. The Bangshi was a distributary of the old Brahmaputra flowed in the southwardly direction through Tangail and discharged in the river Dhaleshwari near Savar at Dhaka. The length of the river is 238km whereas, the average depth of the river is 30ft and maximum depth is 80ft (Kabir, 2014). Sample Collection: The water samples were collected from three different sampling stations of the Bangshi river indicated as St-1 (Mirzapur municipality), St-2 (Gorai) and St-3 (Ajgana) during wet season (July to September 2015) and dry season (December 2015 to February 2016), respectively. Samples were collected by 500ml plastic bottles with double stoppers from each sampling point. The bottle was cleaned and washed with a detergent solution and treated with 5% nitric acid (HNO3) overnight before sampling. Finally, the bottles were rinsed with deionized water and dried. After sampling, the bottles were screwed carefully and labeled properly for identification. Sample Analysis: The physicochemical parameters of water samples were analyzed in the laboratory of the Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail. The water temperature and pH were determined by the thermometer and digital pH meter (Model: pH Scan WP 1, 2 Malaysia), respectively. Digital EC and TDS meter (Model: HM digital Germany) was used to determine EC and TDS, respectively. The DO was determined by digital DO meter (Model: D.46974 Taiwan). The BOD was measured by two steps where initial DO1was measured immediately after collection and after 5 days DO5was measured by incubation in the dark condition at 20ºC for 5 days. Alkalinity was determined by titration method with 0.1 N HCl after addition 2-3 drops of methyl-orange indicator. Statistical Analysis: The collected data were compiled and tabulated in proper form and were subjected to statistical analysis. The Microsoft Office Excel software was used to present and interpret the collected data. The results of the study were presented in charts and tabular forms.

Source of Information: Journal of Science and Technology, 6(1 & 2): 153-160, December 2016

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The study observed that the highest water temperature was found during the wet season that exceeded the standard level for the aquatic environment and the lowest temperature was found during the dry season. During the dry season, both the TDS and EC contents were much higher than the wet season, while TDS content slightly exceeded the standard limit and EC content of the water was suitable for fisheries production. DO content was much lower during the dry season than the wet season whereas BOD content was found to be higher during dry season than wet season this might be due to the presence of comparatively more organic waste in the river water. The result also depicted that the water was a tendency to become alkaline over all stations in both seasons and much higher alkaline water was found during the dry season compared to wet season. The overall study concluded that the river water is not suitable for fish culture. To maintain a sound environment and healthy ecosystem of the river, it is obvious to raise awareness regarding the water quality problems and river management through education, monitoring and research.

Knowledge Management: Journal