Journal
REVIEWS IN ENVIRONMENTAL SCIENCE AND BIO-TECHNOLOGY
Volume 17, Issue 4, Pages 591-602Publisher
SPRINGER
DOI: 10.1007/s11157-018-9477-y
Keywords
Oily water; Emulsions; Flotation; DAF; Biosurfactants; Environmental pollution
Funding
- Foundation for the Support of Science and Technology of the State of Pernambuco (FACEPE)
- Research and Development Program from National Agency of Electrical Energy (ANEEL)
- Thermoelectric Company of Candeias (Global Group) [PD-06961-0005/2016]
- National Council for Scientific and Technological Development (CNPq)
- Coordination for the Improvement of Higher Level Education Personnel (CAPES)
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The present review was motivated by the increasing demand of environmental regulatory agencies for the treatment of oily water generated during industrial activities. Flotation is a promising process for this purpose. Particularly, dissolved air flotation (DAF) is the most indicated technology due to its high efficiency and the possibility of controlling the physical variables, such as microbubble size, residence time and concentration of the effluent. DAF can also be optimised with the use of biodegradable tensioactive agents that increase the adhesion of oil particles, thereby enhancing the efficiency of the process. Among such tensioactive agents, biosurfactants are a viable, innovative, eco-friendly option with important properties, such as a reduction in surface tension, low toxicity and stability in the presence of adverse environmental conditions. Therefore, the aim of the present review is to offer a new perspective regarding the use of the flotation process combined with these specific biomolecules.
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