LM14,15 - Air Pollution Control, measures

1. KGiSL Institute of Technology
(Approved by AICTE, New Delhi; Affiliated to Anna University, Chennai)
Recognized by UGC, Accredited by NBA (IT)
365, KGiSL Campus, Thudiyalur Road, Saravanampatti, Coimbatore – 641035.
Department of Information Technology
Name of the Faculty : Mr.Mani Deepak Choudhry
Subject Name & Code : OCE551/Air Pollution and Control Engineering
Branch & Department : III IT & Information Technology
Year & Semester : III / V
Academic Year :2022-23

2. SYLLABUS
UNIT 3 – CONTROL OF PARTICULATE CONTAMINANTS
Factors affecting Selection of Control Equipment – Gas Particle
Interaction – Working principle - Gravity Separators, Centrifugal
separators Fabric filters, Particulate Scrubbers, Electrostatic
Precipitators.
OCE551/APCE/III IT/V SEM/KG-KiTE

3. OCE551/APCE/III IT/V SEM/KG-KiTE
Course Outcomes
CO 3 Design stack and particulate air pollution control devices to meet applicable standards. K3 LEVEL

4. OCE551/APCE/III IT/V SEM/KG-KiTE
Topic
1. Factors affecting Selection of Control Equipment
2. Gas Particle Interaction
3. Working principle - Gravity Separators
4. Working principle - Centrifugal separators
5. Working principle - Fabric filters
6. Working principle - Particulate Scrubbers
7. Working principle - Electrostatic Precipitators

5. OCE551/APCE/III IT/V SEM/KG-KiTE
Concept of Air Pollution Control
• Reduction of air pollution is carried out in following 3 stages:
• Reducing the volume of polluted streams
• Changing the process of causing the pollution
• Treatment to emitted gas
• Application of control technology depends on following factors:
• Nature of Source
• Effluents from the Source
• Air Pollution Regulations
• Waste generated from technology
• Disposal of waste

6. OCE551/APCE/III IT/V SEM/KG-KiTE
Objective of Air Pollution Control
• Controlling of effects of air pollution on public
• Protection of animals, plants etc.,
• Protection of properties against pollutants attack
• Providing the acceptable environments
Factors affecting selection of control equipment
• Type of industry
• Concentration and characteristics of pollutant
• Carrier gas characteristics
• Process factors
• Control Efficiency
• Operational Factors
• Constructional Measures and Other Factors

7. OCE551/APCE/III IT/V SEM/KG-KiTE
Self-Cleansing Properties of Environment
• Dispersion – chemical or physical process of distributing air pollutants over wide area of atmosphere
by means of wind
• Gravity settling with & without flocculation – natural process in which large particles of air pollutants
in the air settle down on building, trees and other objects.
• Absorption – gaseous and particulate matters of air pollutants are collected either by mist or rain
• Process of absorbing the pollutants and falling with raindrops is called washout or scavenging
• Adsorption – physical process of collecting gaseous, liquid and solid air pollutants in the air by surface
• Adsorbents – soils, flocks, buildings, blades of grass
• Rainout – process of dropping out pollutants and involving precipitation process above cloud level

8. OCE551/APCE/III IT/V SEM/KG-KiTE
Air Pollution Control
• 2 methods:
• By changing raw materials in industries
• By installing suitable air pollution control Equipments
• Types of Emission:
• Uncontrolled / fugitive
• Controlled / steady-state
• Transient
• Accidental / emergency

9. OCE551/APCE/III IT/V SEM/KG-KiTE
Methods for controlling pollution
• At Source without devices
• Process Change
• Change in Fuel
• Good Operation Practices
• Plant Shutdown or relocation
• Use of control devices
• By installing Equipments
• Replacement of burning fuel by electricity or solar energy
• Using high quality efficient engines
• Replacement of old machineries
• By installing mechanical air pollution controlling devices

10. OCE551/APCE/III IT/V SEM/KG-KiTE
Control of particulate pollutants in industries
• Gravitational Settling
• Centrifugal impaction
• Inertial impaction
• Direct interception
• Diffusion
• Electrostatic attraction
• Devices
• Gravitational Settling Chamber
• Centrifugal Collectors
• Wet Scrubbers
• ESP & Fabric Filters

11. OCE551/APCE/III IT/V SEM/KG-KiTE