This patented non-impregnated catalytic carbon was designed specifically for odour control in wastewater applications where the main pollutants are hydrogen sulphide and mercaptans. It is unique in that it has a high capacity for sulphide removal without the need for chemical impregnants.
Its enhanced catalytic properties promote a fast reaction between the odourous sulphur compounds and oxygen present in the air. H2S and mercaptans are converted respectively into water washable sulphuric acid and sulphonic acid, while the other contaminants are readily adsorbed. Any ammonia present is easily eliminated by reaction with the sulphuric acid formed. As the catalytic carbon is not impregnated, it also has a high capacity for volatile and odorous organic compounds. Chemical impregnants by their very nature occupy adsorption sites which would otherwise be available to adsorb these compounds. Catalytic activated carbon also exhibits an increased capacity for H2S because its catalytic sites promote a reaction between the hydrogen sulphide and oxygen in the odorous air stream.
The life-cycle costs of water regenerable carbon filtration systems have been shown to be up to 75% less than for conventional impregnated carbons used for sulphide filtration. They also eliminate the safety concerns typically encountered with alkali regeneration and chemical handling.
The filter will continue to remove sulphides until it becomes saturated. Once H2S breakthrough occurs, the H2S removal capacity can be restored simply by washing the carbon in water. The washing process eliminates the acids and other soluble reaction products present, as well as assisting with the desorption of most of the adsorbed organic compounds. This process can be repeated a number of times before the carbon must be regenerated by thermal reactivation, which is not possible with impregnated carbons.
- Our simple and effective carbon filters are used as stand alone units or; as a treatment stage in combination with other treatment processes for more complex applications or where high level treatment is required.
- Design air flow capacities range from 150m3/hr up to 30,000m3/hr per filter unit. Larger air volumes can be accommodated by using banks of filters connected in parallel.
- Filters are designed as up-flow or radial-flow systems with a low pressure drop to maximise energy efficiency.
- Filters are designed to allow for in-situ water regeneration of the carbon. This eliminates the downtime and cost associated with replacing impregnated carbon on a regular basis.
- A2V will carry out replacement of carbon at required intervals and arrange for disposal of the spent carbon. Where possible, A2V will arrange for spent carbon to be regenerated for reuse.
- Retrofitting of traditional activated carbon filters with catalytic carbon is a relatively straightforward process that allows the user to enjoy the benefits chemical free regeneration with minimal capital improvement.