Water quality assessment of the river Buriganga, Bangladesh

Abstract

The present investigation was conducted to assess the water quality status of the river Buriganga. Water samples were collected from three selected stations in wet (June-August) and dry (November-January) seasons during the years 2017 and 2018. Temperature and Dissolved Oxygen (DO) of water varied from 22.80 to 31.40 °C and 0.22 to 2.74 mg/L, respectively. Electrical conductivity of water varied from 180 to 598 μS/cm while pH ranged from 7.61 to 8.97. This study showed that temperature, DO and Fe were higher in wet season than in the dry season, whereas pH, conductivity and phosphate were higher in dry season than in the wet season. But manganese did not vary in different seasons. It is found that the differences of water quality parameters were significant in seasons (p<0.05) except for Fe and insignificant for stations (p>0.05) except for DO. The results reveal that there were significant differences between sampling seasons (wet and dry) (p<0.05) except for temperature and manganese. A significant correlation (p<0.01) was also found among temperature and other parameters viz. DO, conductivity, pH, phosphate. According to the result obtained in the present study, it may be said that the water quality of the river Buriganga is not acceptable to declare the river-ecosystem as a sound one ecologically.

Contaminant Discharge From Outfalls and Subsequent Aquatic Ecological Risks in the River Systems in Dhaka City: Extent of Waste Load Contribution in Pollution

“…The lowest level of DO was obtained next to the Savar tannery area. The following DO criteria are permissible following the Environmental Quality Standard (EQS): Fish and domesticated animals need 4–6 mg/L; 6 mg/L for drinking, 4–5 mg/L for industrial purposes, and up to 5 mg/L for industrial applications ( 57 ). Organic chemicals released from sources such as wastewater treatment facilities, storm floods, slurry agriculture, and alcohol silage are possible explanations for the depleted dissolved oxygen levels in the water.…”

Assessment of Physicochemical Properties and Comparative Pollution Status of the Dhaleshwari River in Bangladesh

“…In each polypropylene bottle, 1 mL of ultrapure nitric acid was added to achieve a pH of ~1 [47] before transferring to the Department of Soil, Water and Environment Laboratory of the University of Dhaka for heavy metals analysis. The standard sampling procedure was followed to collect all samples at every single sampling station [48][49][50][51][52].…”

“…Sampling station D-1 exhibited the lowest value of DO (0.06 mg/L) beside the Savar tannery area. According to the Environmental Quality Standard (EQS), the accompanying DO requirements are acceptable: fish and domesticated animals require 4 to 6 milligrams per liter and 6 mg/L for drinking, 4 to 5 milligrams per liter, whereas industrial applications require up to 5 milligrams per liter [50].…”

Heavy metal toxicity in Buriganga river alters the immunology of Nile tilapia (Oreochromis niloticus L)

“…The Buriganga river water is a threat to the contamination from untreated municipal wastes, industrial discharges, runoff from organic and inorganic fertilizers, and pesticide emission around the river and leading to the extinction of aquatic life and breakdown of the river ecosystems [43]. Fatema et al [44] found that the Buriganga river was highly polluted with heavy metals during the dry season, which is harmful to the river ecosystem. The results from the present study showed that heavy metal pollution in river water was not safe for living organisms.…”