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    Formulation and application of a biosurfactant from Bacillus methylotrophicus as collector in the flotation of oily water in industrial environment

    Year: 2018

    Journal: J. Biotechnol., Volume 285, NOV 10, page 15–22

    Authors: Chaprao, Marcos Jose; da Silva, Rita de Cassia Freire Soares; Rufino, Raquel Diniz; Luna, Juliana Moura; Santos, Valdemir Alexandre; Sarubbo, Leonie Asfora

    Organizations: Research and Development Programme from National Agency of Electrical Energy (ANEEL); Thermoelectric EPASA (Centrais Eletricas da Paraiba); Foundation for the Support of Science and Technology of the State of Pernambuco (FACEPE); National Council for Scientific and Technological Development (CNPq); Coordination for the Improvement of Higher Level Education Personnel (CAPES)

    Keywords: Biosurfactant; Formulation; Bacillus methylotrophicus; DAF; Oily effluent

    The present study describes the formulation of a biosurfactant produced by Bacillus methylotrophicus UCP1616 and investigates its long-term stability for application as a collector in a bench-scale dissolved air flotation (DAF) prototype. For formulation, the conservative potassium sorbate was added to the biosurfactant with or without prior heat treatment at 80 degrees C for 30 min. After formulation, the biosurfactant samples were stored at room temperature for 180 days and the tensioactive properties of the biomolecule were determined with different pH values, temperatures and concentrations of salt. Then, a central composite rotatable design was used to evaluate the influence of the independent variables (effluent flow rate and formulated biosurfactant flow rate) on the oil removal efficiency in the DAF prototype. The formulated biosurfactant demonstrated good stability in both conservation methods, with tolerance to a wide pH range, salinity and high temperatures, enabling its use in environments with extreme conditions. The efficiency of the formulated biomolecule through heating and addition of sorbate was demonstrated by the 92% oil removal rate in the DAF prototype. The findings demonstrate that the biosurfactant from Bacillus methylotrophicus enhances the efficiency of the DAF process, making this technology cleaner. This biosurfactant can assist in the mitigation and management of industrial effluents, contributing toward a reduction in environmental pollution caused by petroleum-based hydrocarbons.
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