이앤켐솔루션

Air Environment Solution

Odor Removal System

Dry odor removal system that enables excellent removal of hydrogen sulfide and reduction of complex odors by applying to sites where high concentration of hydrogen sulfide is generated through iron hydroxide desulfurization agent.

Introduce

Odor Removal System

Dry complex odor removal system

Removal of ammonia and moisture using dehumidification process

Removal of hydrogen sulfide using iron hydroxide

Removal of complex odors by removing aldehydes using activated carbon

Remove existing odors

Short adsorbent replacement cycle due to wetting

Unaware of the need for dehumidification

Low removal rate due to low reactivity between hydrogen sulfide and iron oxide.

High operating cost due to short replacement cycle

Application of multi-stage chemical cleaning (scrubbing) tower is excessive in facility investment cost, chemical cost, electricity cost, etc.

A large amount of waste liquid and waste water generated by chemical cleaning through scrubbing

Requires additional facilities to prevent the generation of nitrogen oxides (NOx) during combustion and deodorization and high operating costs due to fuel use

Dry odor removal

A dry process through dehumidification to prevent deterioration of adsorption capacity due to wetting

60% reduction in dehumidification cost through two-stage heat exchange dehumidification

Since hydrogen sulfide is separately removed by iron hydroxide(Fe(OH)₃) it exhibits superior compound odor removal performance compared to the existing process

Reduction of initial installation cost due to minimum residence time

Reduced operating costs by using minimal power

Unmanned operation possible and easy on-site maintenance

No wastewater generated by the use of chemicals

Schematic diagram of odor removal system

Odor source

Intake(Blower)

Dehumidification equipment

1st deodorization

2nd deodorization

Atmosphere dispose

Clean air quality is secured by removing ammonia and hydrogen sulfide sequentially through a dehumidifying process and an iron hydroxide-based adsorbent, removing VOC’s through an activated carbon tower, and discharging to the air.

* VOC’s : volatile organic compounds

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Primary deodorization principle (removal of hydrogen sulfide and ammonia)

Mechanism of removing hydrogen sulfide and ammonia

* Hydrogen sulfide is reacted and removed through a porous iron hydroxide-based adsorbent, and Primary purification by adsorbing ammonia and some VOC’s

Secondary deodorization principle (VOC’s removal)

Activated carbon physisorption principle

Activated carbon

Through the high specific surface area of activated carbon Physiosorbent Tablets

Excellent adsorption performance

It has excellent adsorption performance for Mercaptans, hydrocarbons, organic chlorine compounds and aldehydes(VOC's) so it absorbs the components contained in the complex odor

Tancheon Water Regeneration Center
Jungnang Water Regeneration Center

Tancheon Water Regeneration Center

Tancheon Water Regeneration Center Digested Sludge Reservoir-derived Odor Removal Demonstration Test

Tancheon Water Regeneration Center

Conditions for ingress of odors

Demonstration test capacity : 2,500 L/min

Hydrogen sulfide(H₂S) density : 10~40 ppm

Complex odor dilution drainage : 1,000~10,000 times

Test bed size : 500 L

Residence time : 12sec

How to introduce odorous air : Up-stream method

Seoul-si Tancheon Water Regeneration Center Digestive Thalis Reservoir → Pilot-plant about 70m

Installation site appearance & design

Tancheon Water Regeneration Center Digested Sludge Reservoir-derived Odor Removal Demonstration Test

Hydrogen sulfide inlet (S1) and outlet (S2) concentrations

Average inlet concentration(ppm) : 18.16

Average outlet concentration(ppm) : 0.41

Average hydrogen sulfide removal rate(%) : 97.76

Result table
Division	Inflow	1st deodorization	2nd deodorization
Dilution drainage	3,000	1,000	448

※ Complex odor measurement and analysis progress (Measuring Agency: Korea EMC)

Result table_2
Odor type	Field test conditions	Processing criteria	Sampling location
Digested sludge storage tank	2,500 L/min	Hydrogen sulfide less than 1ppm, Dilution drainage less than 100	Inflow, After dry adsorption, After wet adsorption

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Jungnang Water Regeneration Center

Jungnang Water Regeneration Center Sludge Concentration Tank-derived Odor Removal Demonstration Test

Jungnang Water Regeneration Center

Conditions for ingress of odors

Demonstration test capacity : 400 L/min

Hydrogen sulfide(H₂S)density : 1~4 ppm

Complex odor dilution drainage : 100~60,000 times

Test bed size : 5L * 2part(top/bottom configuration)

Odor air intake method : Up-stream method

Odor generation and verification point

Demonstration test driving conditions

Space velocity

4,800hr^-1

Residence time

0.75 sec

Throughput

400 L/min

Hydrogen sulfide(odor-causing substance) removal rate

100% removal (operation period: 49 days)

Diluted drainage after inflow of odor and treatment

Dilution of inflow odor

100~60,000 times - Influence of sludge loading situation and weather

Dilution of odor after treatment

10~150 times - Results measured through air dilution sensory method

Development of dry complex odor removal process with excellent odor removal performance

Test table
Division	Inflow	1st deodorization	2nd deodorization
Dilution factor	448	207	30

※ Complex odor measurement and analysis progress (Measuring Agency: Korea EMC)

Test result table
Odor type	Field test conditions	Processing criteria	Sampling location
Concentration tank-derived occurrence	400 L/min, Operating hours (49 days)	Hydrogen sulfide less than 1ppm, Dilution drainage less than 100	Inflow, primary (DeHyS-250), secondary (impregnated activated carbon)

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Proposal of odor removal demonstration test in sewage treatment plant

Expected odor conditions

Expectedhydrogensulfide(H₂)concentration : 1~40 ppm

Expected ammonia(NH₃) concentration : 1~60 ppm

Expected dilution factor of inflow complex odor : 1,000~60,000 times

Demonstration test driving conditions

Demonstration test capacity : 10 CMM, 8HP

Test bed size : 1.0 m³

Residence Time : 6sec

Space Velocity : 600 hr^-1

Schematic diagram of odor removal system

It sucks in the complex odor diluted in the air from the odor source and discharges the odor-free air after the primary and secondary deodorization process through the dehumidification process. However, in the case of dry gas, dehumidification facilities are excluded.

Odor Removal Target

Odor removal target table
Division	Removal rate	1st deodorization	2nd deodorization
Hydrogensulfide(ppm)	99%	1 or less	1 or less
Complex odor	80%	1,000 or less	300 or less
Moisture	-	50RH% or less	50RH% or less