METHOD AND APPARATUS FOR TREATING WASTE GAS CONTAINING VOLATILE ORGANIC SUBSTANCE AND/OR MALODOROUS SUBSTANCE

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for treating a waste gas without discharging excess sludge to the outside and requiring nutrient salts to be supplemented in a biological treatment of a waste gas. SOLUTION: This waste gas treatment apparatus comprises a waste gas treatment tank 1 provided with a packed layer 2 holding microorganism in the inside, an inlet and an outlet 8, 9 through which a waste gas flows in tbe packed layer 22, a water spraying apparatus 4 and a water storage tank 3 installed in the upper part and the lower part of the packed layer 2, respectively, a route 10 for circulating water of the water storage tank to the water spraying tank and a culture solution leading inlet 11 and a sludge separation tank 6 for separating excess sludge of the treatment tank 1 and the waste gas treatment apparatus is further provided with a volume decreasing apparatus 7 for treating separated sludge of the sludge separation tank 6 to decrease the volume and a route 16 for leading the sludge treated by the volume decreasing apparatus 7 to the treatment tank 1. The treatment for decreasing the sludge volume can be carried out by ozone treatment, hydrogen peroxide treatment, acid treatment, alkaline treatment, ultrasonic treatment, sand pulverization treatment, or two or more of these treatments in combination.