Scaled-up bioconversion of fish waste to liquid fertilizer using a 5 L ribbon-type reactor

摘要

A scaled-up conversion process offish waste to liquid fertilizer was performed in a 5 L ribbon-type reactor. Biodegradation was performed by inoculation of autoclaved fish waste with 5.84 x 105 CFU mlr1 of mixed microorganisms for 96 h. As a result, the pH changed from 6.92 to 5.72, the cell number reached 7.28 x 105 CFU mL 1, and approximately 430 g (28.3%) offish waste was degraded. Analyses indicated that the 96 h culture of inoculated fish waste possessed comparable fertilizing ability to commercial fertilizers in hydroponic culture with amino acid contents of 6.91 g 100 g~'. Therefore, the scaled-up production achieved a more satisfactory fish waste degradation rate (3.61 g h~1) than the flask-scale production (0.24 g h"1). The biodegraded broth offish waste at room temperature did not undergo putrefaction for 6 months due to the addition of 1% lactate.%Department of Biotechnology and Bioengineering Pukyong National University, 599-1 Daeyeon-3 Dong, Nam-Cu, Busan 608 737, Republic of Korea;Department of Biotechnology and Bioengineering Pukyong National University, 599-1 Daeyeon-3 Dong, Nam-Cu, Busan 608 737, Republic of Korea;