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Assessment of Water Quality Index: a Case Study in Old Brahmaputra River of Mymensingh District in Bangladesh

Z Muyen
Associate Professor
Department of Farm Structure & Environmental Engineering, Bangladesh Agricultural University, Mymensingh 2202

M Rashedujjaman
Department of Farm Structure & Environmental Engineering, Bangladesh Agricultural University, Mymensingh 2202

MS Rahman
Department of Farm Structure & Environmental Engineering, Bangladesh Agricultural University, Mymensingh 2202

Abstract/ Executive Summary:

This study was conducted to measure the water quality parameters of old Brahmaputra River in Mymensingh district near Bangladesh Agricultural University to determine the water quality index (WQI) of the River Brahmaputra. Water quality focuses on various aspects of the physico-chemical parameters by which the quality of the water body can easily be elucidated. Three different locations were selected within the study area. Water samples were collected in April 2015 from these three locations along the river and analyzed for these physico-chemical parameters: pH, Dissolve Oxygen (DO), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Ammoniacal Nitrate (AN), Suspended Solids (SS). The values of these parameters were used to calculate the WQI based on the equation derived by the Department of Environment (DoE) Malaysia. The WQI was found to be 57.58, which falls in the class IV category and means that the water is very polluted and as of April 2015, this water is not suitable for public water supply, not suitable for recreational purpose, has limited potential for aquaculture but is suitable for irrigation.

Keywords: Water quality parameters, Physico-chemical, Water quality index

Location: Shambhuganj Bridge of Mymemsingh District up to the last boundaries of Bangladesh Agricultural University campus.

Start Date: 00-04-2015

End Date: 00-04-2015

Program Area: Physical and Mechanical Properties

Commodity: Water pollution

Objectives:

To measure the water quality parameters of old Brahmaputra River in Mymensingh district

Methodology:

The present study was conducted over a stretch of 3 kilometers along the river old Brahmaputra starting from the Shambhuganj Bridge of Mymemsingh District up to the last boundaries of Bangladesh Agricultural University campus. There were three sampling stations such as: (i) Bridge (ii) Kewatkhali (iii) “SheshMor” in Mymensingh district on the Brahmaputra river near Bangladesh Agricultural University. The distance between the sampling points were about one kilometer. Samples were collected in April 2015. Three samples were collected from each location. A total of nine 250 ml plastic bottles were properly washed and rinsed with 1-2 ml 2% HCl and dried. All nine bottles were appropriately labeled. These bottles were rinsed again with the water to be sampled just prior to sampling. The samples were taken from points 12 inch below the surface of the water body. Once the bottles were filled, they were securely sealed. Precautions were taken during sampling to avoid aeration. Once collected, the samples were carefully transported to the laboratory and analysis was done instantaneously.

Source of Information: Progressive Agriculture 27 (3): 355-361, 2016

Article Link (Online Journal): DOI: https://doi.org/10.3329/pa.v27i3.30832

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present study concludes that the Old Brahmaputra river water within the study area was not fit for drinking but might be used for agricultural purposes. This quality of water may cause harm to the aquatic life due to lower concentration of dissolve oxygen. This water is currently being used for washing clothes and utensils, discharging of sewage, boating, fishing, open defecation and religious ritual activities.Biological and organic impurities resulting from fertilizers, municipal waste waters, feedlots, septic systems, municipal and agricultural runoff are affecting the quality of the water on a daily basis. It is important that the water is subjected to continuous monitoring and treatment process if the water is to be used for drinking, agricultural and domestic purposes.

Knowledge Management: Journal