Match the environmental pollution control technologies in List-I with their corresponding … — State PSC Exam

Match the environmental pollution control technologies in List-I with their corresponding primary operating mechanisms and target pollutants in List-II.

Electrostatic Precipitator (ESP)Corona discharge ionization to collect fine particulate matter ( $PM_{2.5}$ and $PM_{10}$ ) on oppositely charged collection plates
Wet ScrubberNeutralization and chemical absorption of acidic flue gases such as sulfur dioxide ( $SO_2$ ) using an alkaline liquid spray
Three-Way Catalytic ConverterSimultaneous oxidation of unburnt hydrocarbons and carbon monoxide along with reduction of nitrogen oxides ( $NO_x$ )
Cyclone SeparatorCentrifugal force separation of coarse suspended particulate matter ( $>10\,\mu\text{m}$ ) from rotating gas streams

Answer

Electrostatic Precipitator matches with corona discharge ionization for fine particulate matter collection; Wet Scrubber matches with neutralization and chemical absorption of acidic flue gases (

SO_2

); Three-Way Catalytic Converter matches with simultaneous oxidation of hydrocarbons and

CO

alongside reduction of

NO_x

; and Cyclone Separator matches with centrifugal force separation of coarse particulate matter (

>10\,\mu\text{m}

The pairings correctly match each pollution control device with its distinct physical or chemical mechanism. Electrostatic Precipitators rely on high-voltage corona discharge to ionize and collect fine particulate matter. Wet Scrubbers utilize liquid absorption to neutralize acidic gaseous pollutants such as

SO_2

. Three-Way Catalytic Converters promote simultaneous oxidation of carbon monoxide/hydrocarbons and reduction of nitrogen oxides. Cyclone Separators use gas vortex velocity and centrifugal forces to isolate coarse suspended particles.

Step-by-Step Solution

Analyze particulate control technologies based on physical separation mechanisms

Electrostatic Precipitators utilize high-voltage electric fields (corona discharge) to charge and capture fine particles (

PM_{2.5}

and

PM_{10}

), whereas Cyclone Separators rely purely on mechanical inertia and centrifugal force to drop out coarse particulates (

>10\,\mu\text{m}

Differentiating electrostatic particle charging from mechanical vortex inertia links Electrostatic Precipitator to fine particle ionization and Cyclone Separator to coarse particle centrifugal removal.

Analyze gaseous pollutant mitigation methods across stationary industrial and mobile sources

Wet Scrubbers spray liquid reagents to neutralize acidic gases such as

SO_2

in industrial stack gases, while Catalytic Converters use solid-state noble metals to remediate vehicle exhaust gases (

CO

NO_x

, unburnt hydrocarbons).

Distinguishing liquid-gas chemical scrubbing from solid-phase heterogeneous catalysis establishes the correct matches for gas treatment equipment.

Verify complete pair alignment across List-I and List-II

Electrostatic Precipitator aligns with fine particle ionization; Wet Scrubber aligns with acidic gas scrubbing (

SO_2

); Three-Way Catalytic Converter aligns with multi-pollutant automotive redox catalysis; Cyclone Separator aligns with coarse particulate centrifugal separation.

Ensures precise technological mapping without overlapping operating principles.

Key Concept

Operating Principles of Air Pollution Control Equipment and Industrial Emission Reduction Technologies

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