STUDY ON THE GROWTH OF BACILLUS VELEZENSIS M2 AND APPLYING IT FOR TREATMENT OF THE CATTLE SLAUGHTERHOUSE WASTEWATER

Abstract

Wastewater from cattle slaughterhouse usually contains high COD and total nitrogen concentration, which required to be treated properly in order to prevent pollution. Strain Bacillus velezensis M2 isolated from Thinh An slaughterhouse, has high ability to degrade organic pollutants rapidly and, therefore, it can be used to produce biological product for slaughterhouse wastewater treatment in large scale, thus reduce setting-up time of operation. In this study, we showed that the best conditions for Bacillus velezensis M2 to grow are NA medium, initial pH of 6.5, inoculum of 3 % (v/v), shaking of 200 rpm. For test in laboratory-scale of 500 ml flask, Bacillus velezensis M2 was induced in the cattle slaughterhouse water containing COD of 1260 mg/L and total nitrogen of 137 mg/L, shaking at 200 rpm, inoculum 3 %, after 12 hours the removal efficiency in COD and total nitrogen were 93.2 % and 83.5 %, respectively.