01 April 2003

Award Winning Emergency Gas (EGS) Chlorine Scrubber, Silvan Dam Australia

Airepure installs Scrubber at Silvan Dam

In 2003 Airepure installed a 1 tonne IT Chlorine Scrubber at the Silvan Dam Disinfectant Plant in Victoria, Australia – where this Emergency Gas Scrubber (EGS) removes the contents of a fully-loaded chlorine cylinder to ensure compliance with legislation that requires the risk of chlorine release be reduced as far as is practicable. This was so successful that Purafil (USA) won a major Industry award in April 2003 – The Business Achievement Award in Technology awarded by the Environmental Business Journal of USA (EBJ) due to the revolutionary solution that was provided – as was stated by the EBJ “The dry scrubber was selected because it is simpler (than a wet scrubber) and does not involve having liquid caustic soda on-site”.

The Problem:
According to plant project manager Stephen Answerth, “Melbourne Water was required to reduce the risk of a chlorine release ‘so far as practicable.'” Plant representatives considered using wet scrubbers, which were less expensive but required more maintenance and could harm humans, wildlife, and the environment.

Airepure Provides the Solution:
To prevent accidental chlorine (Cl2) releases, Silvan opted to use an Emergency Gas Scrubber (EGS) that measured 10 feet in diameter by 15 feet tall and held 25,000 pounds of CSO™ media.

In the event of an unintentional Cl2 emission, the EGS follows these steps to eliminate the gas from the air:
1) Released Cl2 is drawn into the scrubber through a blower and contacts dry-scrubbing media.
2) Media react with Cl2 and permanently convert the gas to non-toxic solids.
3) Clean air is discharged to the outdoors with a Cl2 concentration of less than 5 parts per billion.

The EGS requires significantly less maintenance than a wet scrubber. It does not need heaters for outdoor applications, and it has just one moving part–a blower. Instead of using liquid caustic, the EGS neutralizes Cl2 with dry-scrubbing media, which are highly porous, spherical pellets that permanently transform the gas into harmless solids. As long as media do not react with Cl2, they do not need to be replaced; they only require occasional testing to determine remaining life and to project change-out dates. Non-toxic and non-hazardous, media do not require special handling and can be disposed in landfills. “The dry scrubber was selected because it is a simpler system and does not involve having liquid caustic soda on-site,” Answerth said.


Airepure Australia Pty Ltd