Odor Control, Corrosion Control,

& Emergency Gas Scrubbers

Utilizing Dry Scrubbing Media

Applications in Water & Wastewater Facilities

Corrosion Protection

of Electronic Equipment

Odor Control

Emergency Gas Scrubbing

What does Gas-Phase mean?

• Solids (Particulate) - 0.003 to 100 microns

– smoke

– dust

• Liquids ( & vapors) - 1 to 9 microns

– vapors

– aerosols

• Gases - 0.0003 to 0.007 microns

– Hydrogen Sulfide

– Chlorine

The Basic Principles:

Adsorption: The process by which one substance is

attracted to and held on the surface of another.

– Adsorption is a

surface phenomenon

More Principles... Absorption: The penetration of one substance into the

inner structure of another

H2S HCHO

Like

A

Sponge!

And More Principles...

• This process is specific and depends on the

chemical nature of both the adsorbent and

adsorbate

• This process is essentially instantaneous &

irreversible

• Oxidation chemically changes harmful gases to

harmless solids

Chemisorption: The

result of chemical

reactions on and in the

adsorbent

Controlling Corrosion to

Improve Process Reliability

Types of Corrosion

Pore Corrosion:

Observed on gold-plated

electronic contacts or circuits

Creep Corrosion:

Corrosion creeps over the gold

top plating and forms a

nonconductive, insulating film.

Whisker Growth:

Microscopic sulfide crystals

grow out of the surface of

conductive metals.

Whisker Growth

Even gold-plated electronics can corrode!

Acid gases react with metals to form non-conductive

salts, which are forced upwards through pores,

disrupting the contact.

What is Effected?

• Distributive Control Systems -DCS

• Motor Controls

• Switch Gear

• Lab Equipment

• Compressors

Design Requirements

Instrument Society of

America

ISA Standard 71.04-1985

G1 Mild Corrosion not a factor in determining equipment reliability.

G2 Moderate Effects of corrosion are measurable and may be a

factor in determining equipment reliability.

G3 Harsh High probability that corrosive attack will occur.

GX Severe Electronic/electrical equipment not expected to survive.

Severity

Level

G1 Mild

G2 Moderate

G3 Harsh

GX Severe

Copper Coupon Film

Thickness (Angstroms)

0 - 299 300 - 999 1000 - 1999 > 2000

What will G1 Air require?

Room Air Purification, with

Pressurization(0.10 iwg) and/or

Recirculation (6 to 12 ACH)

Humidity Control - 55% RH

Temperature Control - 70 F

Room Construction and Integrity

Typical Large Room Layout

Outside

Air

Tub Scrubber

or Deep Bed Scrubber

A/C

Recirculation

Unit

Typical Small Room Layout

Outside

Air

A/C

Pressurization and

Recirculation

Unit

Primary Contaminant Gases

Hydrogen Sulfide

Chlorine

Sulfur Dioxide

Methyl Mercaptan

Pressurization and Recirculation

Equipment for Smaller Rooms

Positive Pressurization Unit Corrosive Air Unit

Electronic Cabinet Unit

Attaches Directly to

the Cabinet to Provide

Positive Pressure, Clean

Air to Electronics in

Non-Air Conditioned

Spaces

Electronic Corrosion Monitoring

Copper

Silver

OnGuard CCT

Uses quartz crystal microbalance

technology to measure REAL TIME data

of mass gain on copper and silver sensors.

Outputs (4 - 20mA) directly to

Customers DCS System

Typical Large Room Layout

Outside

Air

Tub Scrubber

or Deep Bed

Scrubber

A/C

Recirculation

Unit

OnGuard

CCT

Odor Control

Primary Media

• Odorcarb Ultra

• 35% capacity by wt. for H2S removal

• Odoroxidant

• Broad Range

• Works Well for Mercaptans

• 8% Potassium Permanganate

Other Medias Available for NH3, VOCs, Cl2

• Odormix SP

• Removes amines, aldehydes, organics, mercaptans, and sulfur compounds

Benefits of Engineered Media Vs.

Carbon • Provides Highest Removal Efficiency

• 6-9 Times H2S Capacity over Carbon

• All Purafil Medias UL Rated, Carbon can Ignite

• Chemically Reacts Contaminants, Not Adsorb

• Will Not Desorb like Carbon

– Hot Humid Conditions can Cause Carbon to

Offgas

– Carbon is Usually a Hazardous Waste Since it Can

Desorb after Disposal

• Lower Pressure Drop than Carbon

• Can be EASILY Tested for Remaining Life

Applications

• Economic Size Range, 100 cfm (200 ppm

contaminants) Up To 20,000 cfm (5-10 ppm

contaminants)

• Applications include -

– Headworks

– Biofilter Discharge

– Primary Scrubber Discharge Polisher

– Large Pump Stations

– Storage Tanks

– Small Lift Stations

– Force Main Air Relief Vents

Odor Control – Vessel Scrubber

• Ideal for airflows from

8,000 to 20,000 cfm

• Use at large headworks,

full treatment plants, and

large digesters

Typical Installation

• Sized for airflows

from 1,000 to 6,000

cfm

• Use at small

headworks, large

pump stations, and

screening rooms

Odor Control - Deep Bed Scrubber

Deep Bed Scrubber

• 3 or 4 pass system used when multiple media are required

• Sized for airflows from 1,000 to 8,000 cfm

• Use at small headworks, large pump stations, and screening rooms

Odor Control - Drum Scrubbers

• 100, 300, 500, and

1000 CFM Sizes

• Designed for Existing

Odor Problems at Lift

Stations

• MediaSAKs for Easy

Media Replacement

Emergency Gas Scrubbing for

Accidental Releases

Fundamentals of Dry Process

• Reaction Kinetics Limited

– First Order Reaction

• Bulk Fill System

– Total Required Mass is Present and Available for

Reaction Regardless of Load Rate

• Reaction Front

– Partial Releases Will Only Effect The Media

Behind Reaction Front

Chemicals

• Caustic

– Highly Corrosive

– Toxic/Hazardous

– Controlled

– Limited Shelf Life

– Secondary

Containment

• Dry Media

– Non Toxic

– Not Controlled

– Landfill Accepted

– No Degradation

• Chlorine Removal

• Non toxic/hazardous material before and after reaction

• Landfill acceptable

• Operates at -40 F.

Chlorosorb Ultra

System Components

• Wet

– Mass Transfer

Chamber

– Secondary

Containment

– Pumps

– Valves

– Storage Tank

– Nozzles

– Blower

– Sensor

– Complicated Controls

• Dry

– Vessel/Media

– Blower

– Sensor

– Simple Controls

Operation

• Reliability and Operation of the Wet

Scrubber is Directly Dependent on

How Well it is Maintained

• The Dry Media EGS is Reliable with

Minimal Attention

1-Ton Cl2 Scrubber

Horizontal, Low Profile EGS

Questions

• Thank you for your time

Don Apking – North America Sales

Manager/ Wastewater