Utilization of slag fibers as ecomaterial. II. Collection of Ultrafine Silica and Oil-Water Emulsion.

Abstract

The collection of ultrafine silica particles (23 nm in diameter) and oilwater emulsion (500 nm in diameter) from low concentrated suspensions were studied by using an ecomaterial (slag fibers)-collector bed system.The collec tion efficiency was highly dependent on the sol's pH and less on the specific surface area ratio between collector and ultrafine particles.The highest collec tion efficiency was attained at pH 4 for silica and at pH 3 for oil-water emulsion. The experimental results were partially interpreted by the total interac tion potential theory.In the case of the collection of ultrafine silica a second. mechanism regarding flocculation by the dissolved fraction of the SF comple mented the DLVO theory.In the case of the collection of oil-water emulsion effects regarding the deformable character of the oil drops as well as the hydrodynamic effects derived from the high molecular weight of the oil comple mented the DLVO theory.

Control of Adhesion and Removal of Bacterial Cells from Stable Suspension Using Surface Characteristics

“…した固 -液分離 [8][9][10] ，液 -液分離 11,12) ，相互分離 13,14) ，サイズ分 級 15,16) 等の超微粒子プロセシングを提案し， その有効性を明らか 林 浩志・二瓶智也・生木大志・常田 聡・平田 彰・佐々木 弘…”

Rapid Separation of Oil Particles from Low-Concentrated O/W Emulsions in the Presence of Anionic Surfactants Using Fibrous Slag

“…Since particle attachment to a solid substrate is influenced by physicochemical properties such as surface potential, ion concentration, solution pH, and adsorption of surfactant, these conditions have substantial effects on particle recovery efficiency. Ibañez and others were the first to investigate the treatment of diluted fine O/W emulsions and silica suspensions by packed bed systems and demonstrated that this method enables rapid separation of ultrafine particles (1)(2)(3). Since then, the separation of hematite particle (4), cadmium sulfide (5), ferric hydroxide, magnetite, and also bacterial cells (6,7) has also been examined.…”