Controlling of gaseous pollutants, Biology

The gaseous pollutants can be controlled through the techniques of combustion, absorption adsorption and cold trapping.

(a)   Combustion: Though combustion is a major cause of is pollution but it helps in controlling pollution by converting hazardous pollutants like volatile organic compounds (VOC) and other gaseous hydrocarbons to CO2 and H2O.                                            If pollutants are organic in nature flame combustion is employed. Catalytic combustion is employed where low operating temperature is required.

(b)   Absorption/adsorption: Gaseous effluents are allowed to pass through scrubbers. This technique can be wet or dry. Some of solvents used for wet scrubbing are NaOH, Na2SO3, Ca (OH)2

For dry Scrubbing activated carbon is used which attracts gases and vapour to its surface.

(c)    Cold trapping: All pollutants from air stream may be removed by cold trapping i.e. freezing them (gases or vapors) in collectors maintained at a low temperature. Fractionation is achieved by using bath (00C) and last collector at a liquid nitrogen.



Posted Date: 7/12/2012 2:06:42 AM | Location : United States

Related Discussions:- Controlling of gaseous pollutants, Assignment Help, Ask Question on Controlling of gaseous pollutants, Get Answer, Expert's Help, Controlling of gaseous pollutants Discussions

Write discussion on Controlling of gaseous pollutants
Your posts are moderated
Related Questions
Extraradicular Infections Whatever the cause of post endodontic disease we should do proper diagnosis to determine what is the cause; is it intra or extraradicular infection ,

Define Malnutrition - Effects on Milk and Effects on Mothers? Milk is the sole source of nourishment for many infants for upto 6 months or a year or even more. Therefore, the r

Q. Illustrate Wild Life Sanctuaries? You must have seen how some of the parks are fenced. The intention is to keep the animals from wandering out and not to destroy neighbourin

Define the interaction of vitamin c with lead and mercury? Vitamin C, lead and mercury: Iron alleviates lead toxicity but ascorbic acid is ineffective. Ascorbic acid alleviat

Q. Investigation of Tricuspid regurgitation by Echo Doppler? Investigations ECG in secondary TR shows evidence of right atrial overload and right ventricular hypertrophy

Describe Chronic MR Murmur in MR Murmur ? Characteristic: Pan systolic murmur, often loudest at apex and radiates to axilla, may also be audible in back and over the entire pre

Define Urinary Excretion Test - Thiamin Status? The urinary excretion of thiamin is an index of recent dietary intake of the vitamin. Hence, determination of thiamin in urine s

Q. What is coronary disease? The Coronary disease, or the coronary insufficiency, is a disease in which there is total or partial obstruction of one or more of the arteries tha

Define Advantages of Blanching? Blanching as a pre-treatment before drying has the following advantages: 1. It helps in cleaning the material and reducing the amount

A few statements about the mechanism of evolution are made. Mark the correct statements.   (i)  Evolution happens at the individual level as well as population level. (ii