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- W2181970969 abstract "Recently, foams have been widely investigated for several processes such as: cell and proteins recovery, enhancing mass (oxygen) transfer in fermentation process, heavy metals and pigments removal and soil remediation. This fact is due to its characteristic of high interfacial area, which leads to better removal of solutes from the aqueous phase. In remediation processes the utilization of foam has shown advantages on the contact between the surfactants and the soil contaminant, reducing channeling flow, besides supplying nutrients and oxygen, essential for further bioremediation process. The present work aimed to study the generation and characterization of two types of foams: conventional or regular foams (RF), produced by air injection through surfactant solution, and colloidal gas aphrons (CGAs), produced by high speed stirrer when surfactant solution is submitted to high shear rate in presence of air. These foams differ on some aspects: CGAs presents a gas content (gas hold-up) in the range of 30 – 60% and RF up to 90%. Another difference regarding these foams is associated to their structures; the former contains internal spherical micro-bubbles, whereas the latter present a polyedric structure composed by thin liquid lamellas surrounding the gas phase. Experiments were carried out in batch and continuous systems in order to evaluated the characteristics of produced foam like gas hold-up, density and bubble size under specific operational conditions. The methodology proposed in this paper was effective and enable to produce foams continuously, at constant characteristics, throughout the assay and defined according to the experimental conditions employed. Foam generated from the proposed assemblies, which is easily constructed and operated, can be applied as to separation (heavy-metals, ions, oil) or remediation process." @default.
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- W2181970969 date "2008-01-01" @default.
- W2181970969 modified "2023-09-24" @default.
- W2181970969 title "A STUDY OF THE PRODUCTION AND CHARACTERIZATION OF FOAMS FOR SUBSEQUENT APLICATION ON SEPARATION PROCESS" @default.
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