on

Discharge limit of different

parameters

Group members-Nazmun Nahar –2007100400018 MD.Amimul Ahsan – 2007100400019MD.Abu Sayeed- 2007100400020Leuny D Costa- 2007100400021MD.Samiur Rahman Khan-

2007100400023

A major environmental hazard present in textile industries is the discharge of untreated effluent to the environment, causing pollution of nearby soil and water. To mitigate the risks from the discharge of untreated water, an effluent treatment plant is required. Effluent must meet the national effluent discharge quality standards. As water passes through the ETP, pollutants are removed and the quality of the water is improved, allowing for final discharge to the environment without significant risk. For that the Department of Environment bind a standard Discharge limit for the Each Industries who produce waste water and Discharge it through the pipe line in the nearer water body.

.DO(Dissolved Oxygen).BOD (Biochemical Oxygen Demand).COD (Chemical Oxygen Demand).TDS (Total Dissolved Solids).TSS (Total Suspended Solids).Phenols.Metals & Metalloids.Ammonia.Chloride.Sulphide.Oil & Grease.Nitrate & Nitrite.TOC (Total Organic Carbon)

A value taken to represent the acidity or alkalinity of an aqueous solution and defined as the logarithm of the reciprocal of the Hydrogen ion concentration of a solution.

It is Expressed Numerically on a scale from (O to 14). Neutral solution Having a of 7. Acidic between 0 to bellow 7& alkaline between above 7 to 14

Biochemical oxygen demand ( BOD) BOD is a chemical procedure for determining the uptake rate of dissolved oxygen by the biological organisms in a body of water. The organic load is expressed in terms of BOD, which mg of Oxygen needed to Decompose the organic material in 1 liter of waste water. Required oxygen are decompose by bacteria.

BOD can be used as a gauge of the effectiveness of Waste water treatment plants.The parameter is commonly measured by the quantity of oxygen utilized by bacteria during 5 days culture period. For this it is known at 20°C.

Dissolved Oxygen-DO levels depends on the physical, chemical & biological activities of the water body. In normal water the range of DO is 4 to 6 PPM.

TDS (Total Dissolved Solids)-Total Dissolved Solids (often abbreviated TDS) is a measure of the combined content of all inorganic and organic substances contained in a liquid in molecular, ionized or micro-granular suspended form. Generally the operational definition is that the solids must be small enough to survive filtration through a sieve the size of two micrometer.

COD - Chemical Oxygen DemandThe 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), 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. Older references may express the units as parts per Million(ppm).

TSS (Total Suspended Solids)Which particles are stay over the water surface. Standard limit of TSS in 100 (mg/L)

The full meaning of DOE is Department Of Environment. In Bangladesh, Department of Environment is the regulatory body to monitor & control the pollution from the industrial discharge.DOE mentioned some discharge limit of different types of parameter o textile effluent. As their mentioning parameter textile industries maintain their limit of different parameter

Table 1: Liquid Waste discharge standard for textile industries(Active in Textile).

Parameters Limit

6 to 9

Biochemical oxygen demand or BOD

50 PPM

chemical oxygen demand (COD) 200 PPM

Total Dissolved Solids (TDS) 2100 PPM

Total Suspended Solids (TSS) 150 PPM

Oil & Grease 10 PPM

Treatment of effluent from textile dyeing industries is required to meet the national and international effluent discharge standards. It is required to meet the national standards to abide by the rules set up by the government and to meet the international standard to comply with the standard set up by the buyers.

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A large portion of the industries wastewater originates from dyeing operations. Waste waters from these operations typically contain by products, residual dye, auxiliary chemicals & cleaning solvents. Dyes in waste water maybe chemically board to fabric ,fibers. Discharge limit is the limit guided by DOE. ,BOD,TDS are very sensitive for textiles which are must be controlled for textile.

Discharge limit of different parameters of the waste water must be follow by the industry. The discharge limit of different types of parameters used in wet process & others. The water quality depends on effluent types & discharge quality from different types of industries. The government should take inactive to regulate regularly at an important basis. Because if our environment is not save then we will note save. we have to think now for our benefited.

“Environmental chemistry” Third edition, By-Anil Kumar De New Age International (P) Limited. www.doe-bd.org

We would like to express many thanks to our honorable teacher Dr.Arun kanty Guha for giving us a very good opportunity for presenting ourselves. We also thanks our parents who encouraged us every step of our life. Lastly thanks all of you who are give kind attention for this presentation ceremony .