A new compact odour treatment system is available to treat a wide range of air emission flow rates of 15,000 to 75,000 cfm and more. It is based on “non-thermal plasma” technology so it only uses a modest amount of electricity to operate and it never wears out or needs rebuilding. This technology is effective in removing odours from composting, biosolids, manure and other organics. It is also effective in process factories for food, pet, fish, and animal feed odours resulting from process air venting. The system converts the odour, VOCs and complex organic compounds to carbon dioxide and water. Extremely compact, a 15,000 cfm unit can treat the odour in a six-by-six-by six-feet volume. The four-foot high, 1,500 cfm-sized system is portable enough to travel to any site.