Eliminating harmful, corrosive and odour contaminants from recirculation air systems

CamCarb VG modules with loose-fill media are robust solutions suited for make-up air (outdoor air) and recirculation air systems.

The primary use is the control of acidic gases that are responsible for the corrosion of electronics and electrical equipment in heavy process industries such as pulp and paper mills, petrochemical refineries, mining and metal refining operations, and wastewater treatment plants. They are also suitable for lighter applications such as the removal of noxious and odorous fumes generated outside airports, hospital helipads, cultural heritage buildings, and commercial offices located in city centres. The modules can be filled with different types of Camfil molecular filtration media to suit the specific customer application.

There are two standard configurations of CamCarb VG: VG300 and VG440. The VG300 format is best suited for moderate duty (normally make-up air) applications and the VG440 is best suited for light-duty (recirculation air) applications. CamCarb VG filters can be installed in specially designed housings, with options for front-loading, side loading, or positive seal side access (PSSA). They can also be used as replacements in housings and track systems produced by other manufacturers.

CamCarb VG modules are fully welded and constructed without adhesive to eliminate the possibility of off-gassing. They include a unique moulded mesh to allow the use of a full range of loose-fill media without shedding. Many applications will require multiple molecular media to address a range of contaminants. The different media should be deployed in a series of layered modules. This layered approach will provide the highest removal efficiency, the longest life, and the lowest total cost of ownership (TCO) as each media can be changed when it reaches the end of its useful life. Whereas a blended-media requires all the media to be replaced when just a single component has failed.

Pulp and Paper: The digestion process is the primary generator of hydrogen sulphide, sulphur dioxide, methyl mercaptan, dimethyl sulphide, and dimethyl disulphide. Also, odour causing terpenes are given off by the black liquor. If a mill has a bleach plant, then chlorine and chlorine dioxide will be present in the bleach plant and paper machine areas.

Metal Refining:

The primary source of corrosive gases is smelting. Smelting is a process of applying heat to ore to extract a base metal. Sulphur dioxide is produced from the smelting of mineral ores.

Wastewater Treatment:

Hydrogen sulphide (H2S) gas typically is formed in wastewater collection systems that are conducive to creating septic conditions. Septic conditions occur when bacteria use all of the available oxygen while the decomposing organic matter in wastewater for energy. Sulphur dioxide (SO2) is a common by-product of this process and can be extremely odorous and corrosive. Chlorine compounds are effective in controlling heavy concentrations of H2S in wastewater collection systems but can have corrosive consequences themselves. All of these contaminants listed above can corrode electronic and electrical control equipment. If protective measures are not implemented the likely consequence will be unscheduled downtime caused by equipment failure. CamCarb VG300 modules can be installed in make-up air units to prevent corrosive gases from entering a space and CamCarb VG440 modules can be installed in recirculation to address contaminants generated indoors.

Airports:

The environment surrounding airports is heavily polluted with particulate and gaseous contaminants. Molecular pollution originates from sources such as jet fumes, helipad fumes, which contain hydrocarbons, acetaldehydes, oxides of nitrogen, and ozone. These gaseous pollutants cause a range of health problems from temporary burning eyes to lifelong heart and lung damage. There are also contaminants generated from indoor sources like kitchens, cleaning supplies, construction materials, and travellers. These contaminants can vary, but for the most part, would be considered irritants and odours. Installing CamCarb VG modules in the outdoor air and/or indoor air units will drastically improve indoor air quality (IAQ) in airports.

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