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Seasonal Variation in Wastewater Quality of Mymensingh Municipality Area Discharged Into the Brahmaputra River

M. S. Rahman
Department of Farm Structure and Environmental Engineering, Bangladesh Agricultural University,Mymensingh-2202, Bangladesh

M. Z. Abedin
Department of Farm Structure and Environmental Engineering, Bangladesh Agricultural University,Mymensingh-2202, Bangladesh

M. M. Rana
Department of Farm Structure and Environmental Engineering, Bangladesh Agricultural University,Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The present study was undertaken to monitor the seasonal variations in wastewater quality of Mymensingh municipality area discharged into different locations at the Brahmaputra River. Five sample collection points were purposively selected from five different discharge locations of the study area. The samples were collected during January to November 2012. Collected samples were analyzed for pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Dissolved Oxygen (DO), Total Nitrogen and Available Phosphorus. The study results revealed that the value of EC, TDS, DO, Total Nitrogen and Available Phosphorus of the wastewater samples varied with seasons. The pH was consistently same through out the year, EC, TDS, Total Nitrogen and Available Phosphorus were relatively low in rainy season and high in winter, but DO was high in rainy season and low in winter. Considering the investigated parameters, the wastewater of Mymensingh municipality area that discharged into the Brahmaputra River was suitable for rice irrigation. For aquacultural purposes most of the discharge points of wastewater were not suitable except in rainy season, because the majority part of the year Dissolved Oxygen level was very low that may results in fish mortality. The wastewater containing excess phosphorus and nitrogen may cause algae growth in quantities sufficient to create bad odor. Dead and decaying of algae may also cause oxygen depletion which can kill fish and other aquatic organisms in the Brahmaputra River in winter season.

Keywords: Wastewater, Quality parameters, Irrigation, Aquaculture

Location: Municipal wastewater samples were collected from different selected discharge locations in Mymensingh municipal area.

Start Date: 00-01-2012

End Date: 00-11-2012

Program Area: Crop-Soil-Water Management

Commodity: Water quality

Objectives:

1. To monitor the seasonal variations of wastewater quality discharged into different point at the Brahmaputra river from Mymensingh municipal area for assessing the suitability of using municipal wastewater for irrigation and aquaculture.

Methodology:

Municipal wastewater samples were collected from different selected discharge locations in Mymensingh municipal area. All the samples were collected during January to November of every alternate month. Five samples collection points were chosen from five different wastewater discharge drains of the study area. The wastewater samples were collected in 500 ml plastic bottles. The bottles were cleaned and then washed with drinking water followed by distilled water before sampling. After collecting the sample, the bottles were sealed immediately by tighten head to avoid exposure to air. To provide necessary information for each sample such as date of collection, location, source of water, etc. the bottles were labeled separately with a unique identification number. The parameters like pH, EC, TDS and DO directly measured by the “Water Quality Monitor” in Environmental Engineering Laboratory of the Department of Farm Structure and Environmental Engineering, Total Nitrogen and Available Phosphorus of the samples were determined in Agri-Varsity Humboldt Soil Testing Laboratory of the Department of Soil Science, Bangladesh Agricultural University, Mymensingh. Total Nitrogen and Available Phosphorus were found out by nitrogen distillation unit using semi-micro Kjeldal method and colorimetric method respectively.

Source of Information: J. Environ. Sci. & Natural Resources, 6(2): 65-69 , 2013; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Considering the investigated parameters, the wastewater of Mymensingh municipality area that discharged into the Brahmaputra River was suitable for rice irrigation. For aquacultural purposes most of the discharge points of wastewater were not suitable except in rainy season, because the majority part of the year Dissolved Oxygen level was very low that may results in fish mortality. The wastewater containing excess phosphorus and nitrogen may cause algae growth in quantities sufficient to create bad odor. Dead and decaying of algae may also cause oxygen depletion which can kill fish and other aquatic organisms in the Brahmaputra River in winter season.

Knowledge Management: Journal