Counter-current packed tower scrubbers Cross-flow packed bed scrubbers Sieve tray scrubbers Venturi scrubbers - conventional Pumpless venturi scrubbers Eductor venturi scrubbers Reference list Case History - Australian Gold Reagents (AGR) Waste Gas Scrubbing System

Most of the systems we install use a wet scrubber of one type or another. Wet scrubbers are designed to provide efficient contact between the polluted gas and a scrubbing liquid resulting in the liquid removing ("scrubbing") the pollutants from the gas stream.

Some of these scrubbers are generic in nature		Counter-current packed towers Cross-flow packed towers Sieve tray scrubbers Venturi scrubbers Eductor venturi scrubbers
Some of these utilize proprietary technology		DynaWave® froth zone scrubbers Odorgard™ scrubbers Aeromix™ venturi scrubbers
Counter-current Packed Tower Scrubbers
Vertical tower configuration Contains a bed of Tellerette® tower packing High efficiency gas absorption (>99%) Low pressure drop Small footprint Simple, low cost, trouble free design
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Cross-flow Packed Tower Scrubbers
Horizontal tower configuration Contains a bed of Tellerette® tower packing High efficiency gas absorption (>99%) Low pressure drop Handles moderate solids loadings Minimises headroom required Fan direct on outlet – minimises ducting Suitable for multiple beds Good access for maintenance Kimre pad scrubbers for fertilizer service
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Sieve Tray Scrubbers
Vertical tower configuration Contains a number of perforated trays High efficiency gas absorption Particle removal down to 5 microns Less prone to plugging than packed towers Low liquid-to-gas ratios Can use low volume once through water
Venturi Scrubbers - Conventional
Primarily for particle collection Moderate efficiency for gas absorption Gas and liquid pass through a narrow throat Turbulence created provides gas-liquid contact Particle collection down to 0.5 micron Fixed and adjustable throats High pressure drop/high energy use Higher throat pressure drops increase fine particle collection Can take a number of forms
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Pumpless Venturi Scrubbers
Gas flow vertically upward through the venturi throat Autocirculation of the liquid by the gas and gravity No spray nozzles or pumps required Particle collection down to 0.5 micron Slurry concentrations up to 30% w/w
Eductor Venturi Scrubbers
Use high pressure, high volume liquid flow to create the motive force High liquid to gas ratios Good for very low volume gas flows (e.g. tank vents) High turndown capability Good for very fouling service (no internals) High efficiency gas absorption achievable

In designing systems using the above scrubber types we have available the resources of Ceilcote Air Pollution Control. Ceilcote are one of the leading USA companies providing a broad range of scrubbing systems based on the above scrubber types, and have been doing so for over 40 years. Some of the specialist systems that Ceilcote have developed over this time include:

• Emergency chlorine scrubbing systems for major liquid chlorine storage facilities
• NOx scrubbing for low temperature NOx applications, typically from metal finishing operations
• Ethylene oxide scrubbing for emissions from sterilization operations using ethylene oxide

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Reference List

Scrubbers/Scrubbing Systems - Major Projects

Industry	Application	Technology	Completion
Sewage Treatment	Septage & Grease trap odour control	Chemical Scrubbing	Dec 2003
Liquid Chem. Storage	Vapour emission scrubber control	Chemical Scrubbing	Dec 2003
Sewage Treatment	Plant odour control system	Chemical Scrubbing	Dec 2003
Sewage Treatment	Plant odour control system	Chemical Scrubbing	Nov 2003
Mineral Processing	Waste gas cleaning system - engineering	Chemical Scrubbing	Oct 2003
Mineral Processing	Casting Fume Control	Chemical Scrubbing	Aug 2003
Mineral Processing	Flue Gas Desulphurisation	Chemical Scrubbing	Oct 2003
Mineral Processing	Process Fume Control	Chemical Scrubbing	Sept 2003
General Manufac.	Chlorine scrubbing metal casting	Chemical Scrubbing	Febr 2003
Sewage Treatment	Inlet works odour control	Chemical Scrubbing	Jan 2003
Steel	Electroplating fume control	Chemical Scrubbing	Sept 2002
Waste Treatment	Odour control - composting facility	Chemical Scrubbing	Aug 2002
Semi Conductor	Cross flow ammonia scrubber	Chemical Scrubbing	Febr 2002
Chemical	Sodium/Hydrogen Cyanide scrubbing	Chemical Scrubbing	Febr 2002
General Manufac.	Formaldehyde odour scrubbing	Chemical Scrubbing	Mar 2002
Sewage Treatment	Inlet works odour control	Chemical Scrubbing	July 2002
Sewage Treatment	Process scrubber odour control	Chemical Scrubbing	Dec 2001
Mineral Processing	Titanium dioxide scrubbing system	Chemical Scrubbing	Nov 2001
Industrial Gases	Ammonia fume scrubber	Chemical Scrubbing	July 2001
Industrial Gases	Fume extraction scrubber	Chemical Scrubbing	May 2001
Semi Conductor	Cross flow scrubber	Chemical Scrubbing	Apr 2001
Sewage Treatment	Inlet works odour control	Chemical Scrubbing	Mar 2001
Sewage Treatment	Inlet works odour control	Chemical Scrubbing	Febr 2001
Sewage Treatment	Inlet works odour control	Chemical Scrubbing	Nov 2000
Sewage Treatment	Inlet works odour control	Chemical Scrubbing	Nov 2000
Food Production	Particulate removal	Chemical Scrubbing	July 2000
Liquid Chem. Storage	Packaged scrubbing system (EDA)	Chemical Scrubbing	May 2000
Mineral Processing	Sulphur dioxide scrubbing	Chemical Scrubbing	Mar 2000
Engine Production	Foundry amine emissions	Chemical Scrubbing	Febr 2000
Liquid Herbicides	Amine / material handling odour control	Chemical Scrubbing	Febr 2000
Rubber Processing	Curing oven odour control	Chemical Scrubbing	Febr 2000
Sewage Treatment	Inlet works odour control	Chemical Scrubbing	Jan 2000
Sewage Treatment	Underground storage tunnel odour control	Chemical Scrubbing	Dec 1999
Sewage Treatment	Scrubbing system rebuild and upgrade	Chemical Scrubbing	Nov 1999
Gold Refining	Acid gases, NOx removal	Chemical Scrubbing	Oct 1999
Sewage Treatment	Inlet works/sludge process odour control	Chemical Scrubbing	Oct 1999
Waste Treatment	Biofilter prescrubbing	Chemical Scrubbing	Mar 1999
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Case History

Australian Gold Reagents (AGR) Waste Gas Scrubbing System

Location Kwinana, WA Completion Date   2002 Project Duration   4 months Environmental Group Scope of Work: Design, manufacture, mechanical and electrical ie "assembly of a dust and acid vapour scrubbing system for installation at the AGR Kwinana site Equipment Supplied: Interconnecting Ducting Recirculation pumps Valves and piping Fully skid mounted Installation of control instrumentation Wiring for power and control Design specifications: Gas Flow rate : 15,000Am3/hr NaCN inlet load : 250kg/hr NaCN outlet load : 30mg/Nm_ HCN inlet load : 0.2% w/w HCN outlet load : 10mg/Nm_

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