Abstract: The method and system relate to reducing the content of hazardous chemicals when handling malodorous gases emanating from a pulp mill and before burning said malodorous gases in final incineration equipment in oxygen excess environment in order to oxidize the sulphur compounds. The flow of malodorous gases is transported to final incineration (C2) by using liquid ring pumps. The hazardous chemical, preferably ammonia, is bound or dissolved in the liquid used in the liquid ring pump. A part of the liquid used in the liquid ring pump is bled off to final destruction different than the final incineration equipment in oxygen excess environment.