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Oily water treatment in a multistage tower operated under a novel induced pre-saturation process in the presence of a biosurfactant as collector

2021; Elsevier BV; Volume: 30; Linguagem: Inglês

10.1016/j.btre.2021.e00638

2215-017X

Leonardo Bandeira dos Santos, Rita de Cássia F. Soares da Silva, Pedro Pinto Ferreira Brasileiro, Rodrigo Dias Baldo, Leonie Asfora Sarubbo, Valdemir Alexandre dos Santos,

Electrohydrodynamics and Fluid Dynamics

The increase in water-oil separation efficiency as a function of biosurfactant in a novel process of a continuous induced pre-saturation tower (IPST) with stages was described. The pre-saturation of the effluent in a new IPST prior to its entrance in each stage enabled enhancing the effect of the biosurfactant on the flocculation of oil droplets due to the close contact with the air during the formation of microbubbles inside a centrifuge pump. This change of a conventional dissolved-air flotation device enabled each stage to serve as a final flocculation chamber and flotation separator. The initial flocculation step occurred nearly entirely within the centrifugation pump adapted for the generation of microbubbles. Experimental tests in a bench-scale prototype of an IPST enabled drafting two operation diagrams based on the absence and presence of the biosurfactant produced by the bacterium