Odor and corrosion problems from various manufacturing processes are often the result of multiple airborne contaminants. Industries such as pulp and paper, oil and gas refineries and wastewater treatment generate contaminants such as hydrogen sulphide, an undesirable by-product which is malodorous, toxic and highly volatile.
In wastewater treatment facilities, specific characteristics such as basin detention times, loadings to biological processes and sludge generation potential can influence the odor levels.
Septage and sludge handling systems are also common sources of strong odors. Odor generation is often the result of organic overloading, inadequate supply of air, improper ventilation, or simply the failure to recognize that certain unit processes may require the implementation of special odor control technology.
Typical nuisance odors and corrosive contaminants are also produced in the manufacturing of chemicals, fertilizer, pharmaceuticals and food processing, as well as waste transfer stations, incineration plants and garbage depots.
The ability to control odorous emissions has become a growing concern as cities and populations are expanding closer to plant facilities. The objective of odor control is to prevent or minimize nuisance odor levels to the surrounding community. Safety and comfort of the employees working in plant facilities has also become a top priority. National and local regulations on air quality are more severe, responding to neighbour complaints and environmental groups.
The DAS systems can also be used for the abatement of intentional or non-intentional releases of toxic airborne contaminants, thus preventing them from infecting the space.
THE CONVENTIONAL SOLUTIONS
Traditional solutions used for odor and corrosion problems consist of two types of systems: wet scrubbers and dry scrubbers. Wet scrubbers are typically large towers utilizing chemical solutions to neutralize the odors. These types of systems are used in cases of very high concentrations (greater than 20 ppm) in order to reduce contaminant loads. Wet scrubbers require a major investment and substantial maintenance costs.
Circul-Aire's Deep Bed Air Systems (DAS) are smaller dry scrubbers filled with granular MULTI-MIX� media. Smaller concentrations (less than 20 ppm) require DAS dry scrubbers to efficiently remove contaminants to non-detectable levels.
Servicing DAS scrubbers is minimal only requiring annual bulk loading of the replacement media rather than complex and frequent maintenance procedures necessary for wet scrubbers.