In a carbon adsorption system, the air stream is passed over a bed of adsorbent (carbon) and the odor-causing compounds are attracted to and adhere to the surface of the adsorbent. This is the simplest of the three wastewater odor control technologies. There is no on-going chemical supply to the system, and there are no biological processes to be upset. Adsorption is applicable to a wide range of compounds. Hydrogen sulfide and related sulfur-based compounds are removed effectively by carbon adsorption systems, but ammonia and other nitrogen-based compounds are not effectively treated. Various carbon type systems including activated and impregnated can be used independently or in combinations to remove many different contaminants.
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