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Investigation on Water Quality in the Ashulia Beel, Dhaka

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

Suravi
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.

Abstract/ Executive Summary:

The study was conducted to get an idea about the water quality of the Ashulia beel, and its temporal change over wet and dry seasons due to change of the physicochemical parameters. The water body has become a dumping ground or all kinds of solid, liquid and chemical wastes of bank side population and industries. Encroachment and illegal dredging has become a serious threat for the sound environment of the beel. The water parameters of pH 7.1-7.8 and alkalinity 30-03 mg/I in wet, and pH 7.1-8.4 and alkalinity 90-115 mg/I in dry season, respectively, which were within the standard range or DoE investigation. During wet season, EC 130-310 mg/l, TDS 80-132 mg/I, DO 1.1-2.1 mg/I and BOD-4.4-1.6 mg/I were measured. In dry season, EC 341-442 mg/l, TDS 207-276 mg/I, DO 0.5-2,0 mg/I and BOD 1.0-3.0 mg/I were measured. The comparative analysis showed that most or the water quality parameters of the Ashulia beel were suitable for aquatic organisms including fishes while the DO contents were much lower than the desirable level which may not be suitable for fishes.

Keywords: Ashulia beel, Water quality status

Location: Dhaka

Start Date: 00-07-2010

End Date: 00-12-2010

Program Area: Quality and Nutrition

Commodity: Water quality

Objectives:

To know the present status of water quality of Ashulia beel.

Methodology:

The Ashulia beel is located adjacent to Dhaka city which covers approximately 5000 acres of low land connected with the Turag river. One branch of the Turag river extends over the north-eastern part of the Ashulia thana. The north and east of Ashulia mainly constituted of low lands which forms beel, locally known as Ashulia beel. The soil of the bed is of Madhupur tract on which sediments deposit each year during monsoon flood. Being low land, the lands remain submerged for 6 to 7 months due to monsoon in a year with a water depth of more than 180 to less than 275 cm. The water samples were collected for physiochemical analysis from Taliola (Site 1), Ashulia landing center (Site 2), Berulia (Site 3), Pam house (Site 4) and Sluice gate (Site 5) sites in wet (July-September, 2010) and dry (October-December, 2010) season, respectively. Each sampling sites were divided into four sampling stations or points, and from each sampling stations, 500 ml of water was collected by plastic bottles with double stoppers. Before sampling, the bottles were cleaned and washing with detergent solution and treated with 5% HNO₃over night. The bottles were finally rinsed with deionized water and dried. After sampling, the bottles were screwed carefully and marked with the respective identification number. The water quality parameters such as temperature and pH were determined by the Thermometer and digital pH meter, respectively. Buffer solution containing pH 7.0 was used to calibrate the digital pH meter. Transparency was measured by Secchi Disc method. Electric conductivity (EC) and Total dissolved solids (TDS) were determined by digital EC meter and TDS meter, respectively. Dissolve oxygen (DO) was determined by digital DO meter where sodium thiosulphate (0.025N) was used as a reagent. Acidity was measured by titration with 0.05N NaOH after addition with phenolphthalein indicator which is known as Titration method. Alkalinity was measured by titration with 0.1N HCl after addition 2-3 drops or methyl-orange indicator. The EDTA method was used to determine the hardness of water where eriochrome black T was used as indicator and titration with EDTA solution. BOD was measured by two steps where initial BOD (BOD₁) was measured immediately after collection and after 5 days BOD (BOD₅) was measured by incubation in the dark condition at 20°C for 5 days. Then the total BOD (BOD₁-BOD₅) was measured.

Source of Information: Bangladesh Journal of Fisheries Research, June-Dec. 2010, Vol.14(1-2), pp:55-64, ISSN:1026-6690.

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The water parameters of pH 7.1-7.8 and alkalinity 30-03 mg/I in wet, and pH 7.1-8.4 and alkalinity 90-115 mg/I in dry season, respectively, which were within the standard range or DoE investigation. During wet season, EC 130-310 mg/l, TDS 80-132 mg/I, DO 1.1-2.1 mg/I and BOD-4.4-1.6 mg/I were measured. In dry season, EC 341-442 mg/l, TDS 207-276 mg/I, DO 0.5-2,0 mg/I and BOD 1.0-3.0 mg/I were measured. The comparative analysis showed that most or the water quality parameters of the Ashulia beel were suitable for aquatic organisms including fishes while the DO contents were much lower than the desirable level which may not be suitable for fishes.

Knowledge Management: Journal