Studies on experiment conditions for high-efficiency predominant bacteria decompounding the organic wastewater in rubber industry

Objective: To get the optimal conditions for decompounding the 2-mercaptobenzothiazole in the organic wastewater from rubber industry by using Bacillus cereus strains as representatives of high-efficiency predominant bacteria. Methods: The effects of decompounding 2-mercaptobenzothiazole in the organic wastewater were observed by detecting the changes of chemical oxygen demand (COD; before and after acting, conditions of the tested strains including cultural time and concentration, wastewater-interacting time as well as oxygen and carbon supply. Results: If the concentration of Bacillus cereus was higher than 5% transfer inoculation amount and 18 h-culturing time, the ratio of elimination for COD were the best. REC was significantly increased when bacteria culturing was being shaking and with active carbon or the time of interacting between bacteria and wastewater was prolonged. When interacting time was 1 d, REC was 46.9%. When interacting time was 10 d, REC was 80.6%. Conclusion: Bacillus cereus can be able to decompound 2-mercaptobenzothiazole in the organic wastewater, above results were the basis of the further researching and applying.