Spatiotemporal Assessment of Water Quality of the Sitalakhya River, Bangladesh

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Author(s) Md. Akramul Alam | A.B.M. Badruzzaman | M. Ashraf Ali
Pages 946-955
Volume 2
Issue 6
Date June, 2012
Keywords Water quality, Sitalakhya river, BOD5, Ammonia.

Abstract

In this study, the present status of water quality of the Sitalakhya river has been assessed through field tests and laboratory analyses of water samples from selected locations during the dry seasons of 2008 and 2009. To compare the dry season water quality with wet season, river water samples were also collected and analyzed from some of the selected sampling locations during the rainy/flood season in August 2008. Dissolved oxygen concentration of the Sitalakhya river from Tarabo to Siddirganj has been found to be close to anoxic level due to huge amount of pollution load in these areas. Progressive increases in the dissolved oxygen concentrations measured in the upper portion of the Sitalakhya river. Ammonia-Nitrogen concentrations varied from 0.05 mg/L to 13.42 mg/L along the Sitalakhya river in dry season. Highest ammonia concentration was found at Sarulia near Saidabad water treatment plant (WTP) intake in March 2009. Higher concentration of ammonia was observed during flood tide than ebb tide near Saidabad WTP intake. No significant variation in ammonia concentration with depth was observed. The 5-day Biochemical Oxygen Demand varied from 0.4 mg/L to 28.8 mg/L along the Sitalakhya river in dry season. Highest BOD5 was also found at Sarulia near Saidabad WTP intake in February and March 2009. Spatial and temporal variations of BOD5 were found similar to those of ammonia-nitrogen. Orthophosphate concentrations varied from 0.08 mg/L to 2.8 mg/L along the Sitalakhya river. The water quality of this river is deteriorating rapidly, especially during dry season at certain reaches of the river and pollution has extended upstream gradually towards Ghorasal.

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