OPERATION OF PACKING TYPE BIOLOGICAL DEODORIZING TOWER

PURPOSE:To remove an ammonia offensive smell and to prevent the lowering of deodorizing efficiency by sprinkling water in sprinkling frequency such that the inflow amt. of ammonia flowing in a packed bed does not exceed a specific value until water is sprinkled after water is once sprinkled. CONSTITUTION:Raw gas is supplied to the lower part of the packed bed 2 of a packing type biological deodorizing tower 1 through a raw gas supply pipe 10 by the sucking action of a suction device 13 to be passed through the packing type biological deodorizing tower 1 upwardly and ammonia in the raw gas is removed by bacteria grown on the carrier in the packed bed. The raw gas passed through the packed bed 2 is taken out as treated gas through an exhaust pipe 12. Ammonium nitrate and ammonium nitrite accumulated on the carrier are washed with circulating water sprinkled from the position above the packed bed 2 by a circulating pump 7. Herein, water is sprinkled in water sprinkling frequency such that the inflow amt. of ammonia flowing in the packed bed 2 does not exceed 200g-N/m until water is sprinkled after water is once sprinkled.