TREATMENT OF CHLOROFORM IN WASTE GAS PRODUCED IN PULP BLEACHING PROCESS

摘要

PROBLEM TO BE SOLVED: To efficiently decompose chloroform contained in a waste gas at a low cost by adding the waste gas produced in a bleaching step for a pulp into an oxidation column for oxidizing a black liquor with air. SOLUTION: A waste gas produced in a bleaching step for a pulp is added to an oxidation column for oxidizing a black liquor with air and the ratio of the total flow rate of the air and waste gas to the flow rate of the black liquor is controlled within the range of 10-300 to treat chloroform at 50-100 deg.C reactional temperature. Thereby, the chloroform contained in the waste gas is decomposed.