|
For the treatment of Korean food-wastes, three mesophilic and one thermophilic bacteria were isolated from soil and fermented fertilizers. The thermophilic Streptomyces sp. strain WF021 produced two enzymes which were a protease and a lipase at 55℃. The mesophilic Bacillus sp. strain WF024 produced four enzymes which were a protease, a lipase, a amylase and a cellulase when the strain was grown both at 30℃ and 55℃. The Bacillus sp. PY123 had produced three enzymes which were a protease, a cellulase and a lipase at 30℃. The Bacillus sp. strain CM1 produced three enzymes which were a protease, a amylase, and a cellulase at 30℃. The bacteria were grown in media containing 6% NaCl at least and did not have antagonism each other. The four isolates treated much more food-wastes than referance strains did. In a flask without aeration, three reference strains treated 15.4% of food-wastes, while four isolates treated 23.7% of food-wastes. In a flask with aeration, food-wastes were treated 67.3% by four isolates, and 64.3% by three reference strains, but 53.9% without bacteria. However, food-wastes were treated about 78% in a 200ℓ-reactor made by Siwon Co., while 65.8% in a 20ℓ-reactor made by Sanyo Co.
|