 Rashed-Ul-Islam (Correspondence)  + This article is published under the terms of the Creative Commons Attribution License 4.0 Author(s) retain the copyright of this article. Publication rights with Alkhaer Publications. Published at: http://www.ijsciences.com/pub/issue/2019-05/ DOI: 10.18483/ijSci.2073; Online ISSN: 2305-3925; Print ISSN: 2410-4477 An Investigation into Chemical Parameters of Water of Dhaleswari - A River alongside Tannery Village of Bangladesh Sarmin Akter 1 , Kamrujjaman 2 , Rashed-Ul-Islam 3 ,Badhan Saha 4 1 Department of Zoology, Jahangirnagar University, Savar, Dhaka, Bangladesh 2 Department of Zoology, Jahangirnagar University, Savar, Dhaka, Bangladesh 3 Institute of Leather Engineering & Technology, University of Dhaka, Dhaka-1209 4 Bangladesh Council of Scientific & Industrial Research (BCSIR), Dhaka Abstract: This investigation attempts to assess the chemical parameter of water of Dhaleshwari river Savar, Dhaka alongside the newly constructed tannery village of Bangladesh. The chemical parameters like pH, Electrical Conductivity (EC), Dissolve Oxygen (DO), Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and Salinity are determined. The result reveals that the pH of water collected at different points and at different times of year were ranges from 7.60 to 6.50. EC of water collected at different points and at different times of year were ranges from11.80 μS/cm to 2080 μS/cm. The average value of DO at spot-1 was 4.79166±3.23 mg/l. Spot-2 showed average DO about 6.571667±1.47 mg/l. Biological Oxygen Demand (BOD) of water collected at different points and at different times of year ranges from 1.13 to 17.1 mg/l. Throughout the study period the monthly value of COD were within the range of 218.12mg/L (as minimum value) to 1276.6 mg/L (maximum value). In the study area Salinity of water collected at different points and at different times of year ranged from 0 (minimum) to 0.1 (maximum). Keywords: Water Quality, Chemical Parameter, COD, BOD, Electrical Conductivity, Dhaleshwari River, Tannery Village 1. Introduction Bangladesh is a riverine country. The rivers are the lifeline of this country. It’s economic growth and developments are highly influenced by river water and in terms of quality, the river water of the country is unprotected from untreated industrial effluents and municipal waste water, runoff pollution from chemical fertilizers and pesticides and oil lube spillage in the coastal area from the operation of sea and river ports [1]–[4]. Rivers also provide fish, an important source of protein. Flooding of the rivers during the monsoon season causes enormous hardship and hinders development, but fresh deposits of rich silt replenish the fertile but overworked soil [5]. The rivers also drain excess monsoon rainfall into the Bay of Bengal. Thus, the great river system is at the same time the country’s principal resource and its greatest hazard. Like many other counties of the world, river pollution in Bangladesh is a burning issue. Abundant research has carried out and many recommendations have been forwarded to protect the rivers from pollution [6]–[9]. Water pollution is exceeding the limit in most of the water sources, and has become a great threat to the survival of aquatic species. The rivers of Bangladesh are the worse victim of pollution, especially the rivers which stands in the neighborhood of the Dhaka city is being polluted tremendously. Savar is one of the largest industrial zones near Dhaka in Bangladesh. Dhaka Export Processing Zone (DEPZ) is an industrial area located at Savar in which about 86 industries already exist. These industries generate a large amount of effluent every day and discharge into the adjacent irrigation channels and wetlands which finally pass into the adjacent river [10]–[12]. The process of relocating tanneries from the city’s Hazaribagh area to the tannery village, Horindhora, Savar adjacent to Dhaleswari river has been completed in the year 2017. Establishment of infrastructure at the 200 acre tannery estate has been completed. About 72 factories have already started working at the Savar tannery estate, the rest of the factories are under construction and they will be able to start their factories within a short time. In this tannery estate a central effluent treatment plant (ETP) has been set up but it is not fully functional from the very beginning [13], [14]. With such a major effluent