| dc.description.abstract | Ammonia is a typical odorous gas emittedfrom various industrial areas. night soil and waste water treatment plants. To treat the gas. biological deodorization methods are attracting attention, because they have the advantages oflower maintenance and operation cost and converting to N02-and N03which react with ammonia chemically. Biojilters are reactors in which a polluted gas stream is passed through a porous packed bed carrier on which pollutant-degrading microbial cultures are naturally immobilized. Deodorization mechanisms in biojilter are principally by dissolution ofthe odorous gas in water, contacting with microorganisms, then oxidation by microorganisms. Peat has been proven as an excellent carrier because it possesses a large specijic surface area. a high water retention caparity, ~ndprovides nutrients to microorganisms. Thus. good living conditions/or microorganisms ore given. So far the removal capacity ofammonia by biojilter was relatively lower. In this study. in order to improve biological removal rate ofammonia gas in peat biojilter. peat was seeded with night soil sludge. to foster ammonia oxidizing bacteria by gradual increase in ammonia load. The load of ammonia was initially supplied at O. 13 g-N/d/kg-dry peat and gradually increased up to 3.48 g-N/d/ kg-dry peat by changing space velocityfrom 65 to 350 /z-' or inlet ofammonia concentration/rom 28 to 220 ppm. Complete removal o/ammonia was observed up to maximum load at 2.8 g-N/d/kg-dry peat, which was higher than reported previously, ranged at 0.17 -0.38 g-N/d/kg-dry peat. By controlling the pH in the peat biojilter. the removal ratio was observed at an average of95%far 110 days. At the 'lighest load. the kinetic analysis was conducted. The maximum removal rate ofammonia. v.. obtained was I 1. 4 g-N/d/kg-dry peat and saturation cOllstant. K. was 226 ppm. | id |
