DEODORIZING METHOD

摘要

PROBLEM TO BE SOLVED: To prevent diffusion of malodor and corrosion of facilities by adding peroxide and nitrate ions into the pipeline for transferring the waste water or sludge. SOLUTION: A liq. mixture of a peroxide using a hydrogen peroxide and a nitrate ion using a sodium nitrate is continuously added to the sludge from a chemical adding point 12 in a sludge feed pipe directly after a sludge feed pump 11 by 100 mg/L of 100% hydrogen peroxide and 100 mg/L of nitrate ion. At this time, the hydrogen sulfide or mercaptanes at an odor measuring point 1 around a dehydrator and the hydrogen sulfide at the odor measuring point 2 of a dehydrated cake hopper are measured. A deodorant is added to the delivery of a sludge transfer pump based on the results at the measuring points 1 and 2. Consequently, the odors of the hydrogen sulfide and mercaptanes in a medium are instantaneously removed.