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Assessment of Water Quality Varies Between Pre-monsoon and Post-monsoon Season of the Typical Contaminated River of Bangladesh. a Case Study of Shitalakhya River, Dhaka.

Husna Israt Pia
Department of Soil, Water and Environment, University of Dhaka, Dhaka, Bangladesh.

Marufa Aktar
Department of Soil, Water and Environment, University of Dhaka, Dhaka, Bangladesh.

Supria Sarkar
Department of Soil, Water and Environment, University of Dhaka, Dhaka, Bangladesh.

Abdur Rahman
Department of Soil, Water and Environment, University of Dhaka, Dhaka, Bangladesh.

A B M Sadique Rayhan
Coastal and ocean Management Institute, Xiamen University, Xiamen, China

Md Mazharul Islam
Department of Botany, University of Dhaka, Dhaka, Bangladesh

Masud Hassan
Department of Soil, Water and Environment, University of Dhaka, Dhaka, Bangladesh.

Abstract/ Executive Summary:

This study evaluates the chemical properties of Shitalakhya River water bodies based on its chemical parameters such as Total Suspended Solids (TSS), pH, Electric Conductivity (EC), Total Dissolved Solids (TDS), Dissolved Oxygen (DO), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Nitrogen (N), Chlorine (Cl), Total Phosphorous (P), Sulfur (S), and Potassium (K). To do this chemical analysis, pre-monsoon and post-monsoon seasons were considered to collect the samples from this river. This analysis shows that Total dissolved solids (TSS) of this river in both seasons have crossed the standard limit announced by WHO. The pH is less enough in the pre-monsoon season and in post-monsoon, it is up to the standard value. EC and Phosphorous both have crossed the standard value of drinking water in the Shitalakhya River. Nitrogen is too much less although it is a vital element. TDS, DO, BOD, COD, Cl, and S are approximately under the range of standard limits. This assessment could be helpful for using it under agro-ecological planning. This water quality measurement leads to whether or not it could use it for agricultural and household purposes. The parameters that are high should be reduced in a proper treatment method so that this water can be used both for agricultural and drinking purposes.

Keywords: Water Quality, Hydro-Agricultural, Total Suspended Solids, Electric Conductivity, Total Dissolved Solids, Dissolved Oxygen.

Location: Shitalakhya river, Dhaka

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: River

Objectives:

To important variations of the different chemical parameters analyzed and makes a correlation between the agricultural activities and the analyzed indicators.

Methodology:

During pre-monsoon (2015) and a post-monsoon period (2016), each sample is a composite of twenty sub-samples to minimize error and heterogeneity. The high-density PVC bottles (Merck) used for sampling were thoroughly cleaned by rinsing with 8M HNO₃ and deionizer water followed by repeated washing with effluent sampled so as to avoid contamination. Samples were collected from just below the effluent surface also to avoid floating contaminants. Aeration during sampling was avoided as far as possible. Immediately after collection samples were tested for pH, DO, BOD and COD. The analysis was acidified with concentrated HNO₃ (5 ml/l). Suspended solid was determined gravimetrically. pH, EC, DO and TDS of the sample were determined by using pH, EC, DO and TDS-meter respectively. Organic carbon was estimated by Walkely and Black’s wet oxidation and multiplied by 1.724 to get organic matter content. The COD was estimated titrimetrically. The BOD test was done by measuring O₂ concentration in the samples before and after incubation in the dark at 20⁰C for 5 days. Total Nitrogen was determined by the Kjeldahl method. Total Phosphorus was determined by the yellow color method. Sulphur was determined by the Spectrophotometer method, potassium was determined by the flame photometer method. Chloride was determined by titrimetric analysis.

Source of Information: International Journal of Agriculture, Environment and Bioresearch, Vol. 3, No. 01; 2018

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study reveals that the Shitalakhya River has an enormous effect on the agro-ecological diversity of the nearest area of this river. The chemical analysis of the various parameters of this river is done in a systematic way so that the risk assessment is clearly understood. The contamination from the various industrial effluents and wastes is extremely affecting the agricultural and daily usable water sources through the Shitalakhya River.

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