Environmental Engineering | Engineering Notes India

Dust Collection Devices | Particulate Control | Environmental Engineering

Depending upon the collection efficiency, capacity and operation mode, the dust collection devices are divided in the following three categories: 1. Internal Separators 2. Wet Collection Devices 3. Electrostatic Precipitators. 1. Internal Separators: Internal separator type dust collectors are manufactured in various shapes and sizes. Following types are most common: (a) Louver collector, (b) Fabric filters, (c) Gravity settling chamber, [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Particulate Control|Comments Off

Essay on Adsorption | Gaseous Pollutants Removal | Environmental Engineering

In this essay we will discuss about:- 1. Classification of Adsorbent 2. Characterisation of Adsorbents 3. Mechanism 4. Equipment 5. Regeneration. Essay # 1. Classification of Adsorbent: Potential adsorbent can be classified into three groups: (a) Nonpolar solids: Where the adsorption is mainly physical e.g., activated carbon. (b) Polar solids: Where the adsorption is chemical and no change in the [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Environmental Engineering|Comments Off

Design and Performance of Precipitators | Environmental Engineering

The design and performance of precipitators are affected by a plurality of factors. These are divided into three main categories, namely – efficiency, local, high turbulence eddies scour: (i) Properties of the gas stream, (ii) Properties of the dust, and (iii) Process conditions. (i) Properties of the Gas Stream: The precipitator is designed for a particular throughput rate. Increase in [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Electrostatic Precipitators|Comments Off

How to Control Rats ? | Rodent Control | Environmental Engineering

Get the answer of: How to Control Rats ? Rodents include mice, squirrel, beaver, porcupine, rat, rabbit etc. Out of these rats are the main source of nuisance in the houses. Domestic rats and other rodents are the carriers of disease germs, fleas, lice, mites, intestinal parasites etc. due to their wide distribution and close association with the man. They [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Rodent Control|Comments Off

Diffusion Theories in Relation to Air Pollution Control | Environmental Engineering

In this article we will discuss about the diffusion theories in relation to air pollution control. The dilution of pollutants directly depends on the atmosphere turbulence and diffusion. Therefore the dilution varies with the weather conditions. As the rates of atmosphere dilution determines the levels of pollution in a given location, methods for estimating the degree of atmosphere diffusion are [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Air Pollution Control|Comments Off

Mechanism of Dust Particle Charging | Environmental Engineering

In this article we will discuss about the mechanism of dust particle charging. The dust particles charging takes place by: (i) Diffusion charging, and (ii) Field charging or ion bombardment charging. Diffusion charging is the dominant mode of particle charging for particles with a diameter smaller about 0.2 µm; and field charging dominates for particles with a diameter greater than [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Electrostatic Precipitators|Comments Off

Meteorological Factors for Studying Diffusion Theories | Environmental Engineering

Following meteorological factors should be understood before studying the diffusion theories: 1. Atmospheric Temperature Lapse Rate 2. Speed and Direction of Wind 3. Wind Velocity Profile 4. Richardson's Number. Factor # 1. Atmospheric Temperature Lapse Rate: When the air has minimum velocity or more or less motionless, the accumulation of the pollution will be maximum. When the air is in [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Diffusion Theories|Comments Off

How to Remove Toxic Gases ? | Pollutants Control | Environmental Engineering

Get the answer of: How to Remove Toxic Gases? Gaseous pollutants may be removed from n gaseous stream predominantly by physical or chemical absorption. The pollutant gases are selectively absorbed in a solvent liquid. The solvent liquid so chosen for the purpose must not be costly, operating cost should be minimum and also it should be easily recoverable. Gas absorption [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Gaseous Pollutants Control|Comments Off

Collection Efficiency of an ESP | Electrostatic Precipitators | Environmental Engineering

The overall collection efficiency of an ESP is given by the famous Deustsch Anderson equation. where, f = specific collection area of the electrode and Ud = average migration velocity of the charges dust particles towards the collection electrode. where, n = number of channels used in parallel to the gas stream in a stage, l = length of the [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Electrostatic Precipitators|Comments Off

Control of Gaseous and Odour Emission | Environmental Engineering

In this article we will discuss about the application of adsorption for control of gaseous and odour emission. 1. Vapour Recovery in Process Industries: Major applications are in the recovery of solvents from air stream that are free from particulate matter and whose vapor concentrations are above 700 ppm. Activated carbon has been found very effective in adsorption of various [...]

By Sengupta A|2017-04-21T09:03:20+05:30April 21, 2017|Gaseous Pollutants Control|Comments Off

Tag Archives | Environmental Engineering