Odor Odor Contr Control, ol, Cor Corrosion Contr osion Control, - - PowerPoint PPT Presentation

Odor Odor Contr Control,

• l, Cor

Corrosion Contr

• sion Control,
• l,

& Emer & Emergenc gency Gas S y Gas Scr crub ubber bers s Utilizing D Utilizing Dry S y Scr crub ubbing Media bing Media

Applications in Water & Wastewater Facilities

Corrosion Protection

• f 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

• r 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

• f mass gain on copper and silver sensors.

Outputs (4 - 20mA) directly to Customers DCS System

Typical Large Room Layout

Outside Air

Tub Scrubber

• r 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