Optimization of the slaughterhouse water treatment rate by a new Marinobacter carbonoclasticus SF and its biosurfactant

Abstract

The aim of this study consists of the production of a bio-surfactant from a new bacterial strain, Marinobacter hydrocarbono clasticus SF (96.76 % similarity) isolated from soil contaminated by hydrocarbons in Hassi-Messaoud (Southern Algeria) to treat liquid effluent from slaughterhouse water. The characteristics of organic matter biodegradation tests were discussed. Despite the high pollutant load and the unfavorable physicochemical composition of the effluent, the specific growth rate of the isolated strain after 10 days of incubation in the range of 0?30 g L-1 of NaCl was at neutral pH 7.4 and temperature of 45?C. The best bio-surfactant production yield was obtained after 72 h of incubation and under the optimal production conditions such as diesel as carbon source, ammonium chloride as nitrogen source, and a C/N ratio of 5. The bio-surfactant produced is of glycolipid type with a low critical micellar concentration (CMC), good emulsifying power, and chemical and functional stability. Significant pollutant removal efficiency was obtained using the bacterial strain (up to 82 %) and the bio-surfactant (up to 96 %). Several anions, such as nitrates, phosphates, ammonium, and suspended solids, were measured.