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Seasonal Variation in Quality of Louhajong River Water, Tangail

Md. Rakib Hasan Sarker
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh.

Asadul Islam
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh.

Ariful Islam
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh.

Md. Mahbubul Hoque
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh.

Shimul Roy
Department of Environmental Science and Resource Management, Mawlana Bhashani Science and Technology University, Tangail-1902, Bangladesh.

Abstract/ Executive Summary:

Water samples were collected from three points of Louhajong river (Dighulia, Kagmari Bridge and Oloa) to see the seasonal variation in physico- chemical parameters. The results revealed that some of the parameters such as TDS, alkalinity and acidity have exceeded the standard level in dry season in all of the points, which are unsuitable for different purposes including fish culture. During dry and wet seasons the highest concentrations of BOD was recorded as 2.0 and 0.8 ppm at Kagmari Bridge (point-2) respectively. DO ranged from 1.4 to 3.1 and 2.4 to 3.8 ppm during dry and wet seasons. Maximum and minimum EC was recorded as 890 and 130 µs/cm at Dighulia (point-1) during dry and wet seasons. The results suggest that at wet season Louhajong river may be suitable for fish culture and other purposes.

Keywords: Louhajong river, Water quality, Dry-wet season

Location: Tangail district

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Water quality

Objectives:

To determine the status of water quality of Louhajong river by assessing the physico- chemical parameters in dry and wet seasons.

Methodology:

During May (dry season) and August (wet season) samples were collected from three points and each point consists of three stations namely Dighulia (Point 1; P-1), Kagmari Bridge (Point 2; P-2), and Oloa (Point 3; P-3). At a distance of about 500 meters from each other samples were collected in 250 ml HCl washed plastic bottles. To analyze the samples standard methods were followed. pH was determined by the digital pH meter (Model: AD 1000); EC by the EC meter (Model: HANNA instruments), Total dissolved solid (TDS) was measured by TDS meter (Model: HM Digital); DO by digital DO meter (Model-D. 46974, Taiwan) using sodium thiosulphate (0.025N); alkalinity, acidity and hardness by titrimetric analysis. BOD was estimated according to Trivedy and Goel (1984), where initial BOD (BOD₁) was measured immediately after collecting the sample and BOD (BOD₅) was measured after incubation of water sample in the dark at 20⁰C for 5 days. The color and temperature of the collected samples were measured visually and by thermometer respectively.

Source of Information: Bangladesh J. Sci. Res. 28(1): 9-16, 2015 (June)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

At wet season Louhajong river is suitable for fish culture and other purposes than the dry season. Some feasible options could be followed such as uncontrolled waste dumping should be properly regulated to minimize its effects on the river as well as on the surrounding environment and awareness should be built up among the people about the environmental degradation due to dumping of solid waste, sewage and industrial effluents.

Knowledge Management: Journal