Portable Water Essay

2934 Words Jul 12th, 2016 12 Pages
Topic: Comparative analysis of portable water of Dhaka City Course: ENV 107 Section: 34 Semester: Summer 2016 Prepared by Istiaque Rahman ID: 1611345630 Prepared For
Dr. Md. Tajuddin Sikder
M. Sc. In Environmental Sciences (JU), Ph. D in Environmental Science (Hokkaido University, Japan)
Department of Environmental Science and Management
North South University, Dhaka, Bangladesh

ABSTRACT
Comparative examination of different samples of portable water sources of water in Dhaka city was carried out with a view to
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They are discussed below: 1. Temperature: Temperature of the water should be about 20- 25 C 2. pH: pH stands for “power of hydrogen” which identifies whether the water is acidic, basic or neutral. The standard of pH for pure water is 6.5 – 8.5 3. Dissolve Oxygen (DO): Dissolved oxygen (DO) is one of the most important indicators of water quality. Dissolved oxygen analysis measures the amount of gaseous oxygen (O2) dissolved in an aqueous solution. The standard for DO is 4-8 ppm. 4. Biological Oxygen Demand (BOD) : Biochemical oxygen demand (BOD) (also called biological oxygen demand) is the amount of dissolved oxygen needed (i. e., demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. The BOD value is most commonly expressed in miligrams of oxygen consumed per litre of sample during 5 days of incubation at 20 °C. 5. Chemical Oxygen Demand (COD): the chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water. Most applications of COD determine the amount of organic pollutants found in surface water (e.g. lakes and rivers) or wastewater, making COD a useful measure of water quality. It is expressed in milligrams per liter (mg/L), which indicates the mass of oxygen consumed per liter of solution. 6. Electrical conductivity: The

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