The invention relates to a method and system of 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 oxidise the sulphur compounds. The flow of malodorous gases (20-21 -22-40-41 ) are transported to final incineration (C2) by using liquid ring pumps (1 a, 1 b), and where the hazardous chemical, preferably ammonia, is bound or dissolved in the liquid used in the liquid ring pump, and where a part of the liquid used in the liquid ring pump is bled off (33a,33b) to final destruction different than said final incineration equipment in oxygen excess environment.
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