BIOLGOICAL TREATMENT OF FISHERY WASHING WATER USING BACILIUS SPHAERICUS COUPLED WITH PRODUCTION OF SPORES THAT ARE TOXIC TO MOSQUITO LARVAE

摘要

Research was undertaken to investigate the treatment of fishery washing water using Bacillus sphaericus, and torecover the spores for subsequent use as bioinsecticide to control the population of mosquitoes. This treatment method could reduce pollution due to organic matter by decreasing the value of Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD_5) by about 85/100 and 92/100, respectively. The maximum concentration of spores (83.3×10~7 spores ml~-1) using Normal concentration of filtered fishery washing water was only about 27/100 lower than that obtained in fermentation Using 0.25/100 (w/v) yeast extract. The larvicidal activity of the spores produced in fermentation using fishery washing water To Culex quinquefaciatus, as measured by LD_50 after 48 h, was almost the same as the larvicidal activity of spores obtained Form fermentation suing yeast extract.