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자성 유체분리에 의한 축산폐수내 부유고형물의 제거

Removal of Supended Solids in Livestock Wastewater Using Magnetic Fluid Separation

김용하^† 서근학 오창섭¹

Yong-Ha Kim^† Kuen-Hack Suh Chang-Sup Oh¹

부경대학교 화학공학과, 부산 608-739 ¹호서대학교 화학공학과, 아산 336-795

Department of Chemical Engineering, Pukyong National University, Pusan 608-739, Korea ¹Department of Chemical Engineering, Hoseo University, Asan 336-795, Korea

HWAHAK KONGHAK, April 2000, 38(2), 277-281(5), NONE

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Abstract

폐수내 부유된 미세 고형물과 자성 미분체사이에 van Waals 힘과 같은 부착력이 작용하여 자성 플럭이 형성되며 이와같은 자성 플럭이 폐수의 흐름과정에서의 자성 분리됨에 근거한 자성 유체분리 기술을 축산 폐수내 부유고형물의 제거에 적용한 경우에 있어서, 조업변수와 부유고형물의 제거효율과의 관계를 규명하였다. 96%이상의 제거효율을 얻는데 요구되는 마그네타이트/부유고형물의 질량비는 1.0이상이 되어야 했다. 자성 유체분리탑내 공탑 액체유속이 증가, 즉 유체력이 상승함에 따라 제거효율이 감소되었으나 마그네타이트/부유고형물의 질량비가 0.8 이상으로 증가되면서 제거효율에 때한 공탑 액체유속의 영향은 매우 약해졌다. 미분쇄된 제강 슬러지는 시약 마그네타이츠를 대체할 수 있는 자성미분체로 가능성을 보였으나 동일한 제거효율을 얻기 위해 요구되는 자성미분체/부유고형물의 질량비가 시약 마그네타이트의 경우보다 약 2.5배 이상으로 높아야 했다.

A magnetic fluid separation technology is applied to remove the suspended solids from livestock wastewater. In this study, the effects of operating variables on the removal efficiency are investigated through the test runs using magnetite or sludge from steel-making plant as magnetic fine powders. It is found that the mass ratio of magnetite to the suspended solids should be kept higher than 1.0 in order to obtain more than 96% removal efficiency. In addition, the removal efficiency decreases with an increase in the superficial liquid velocity, but the effect becomes negligible when the mass ratio of magnetite to the suspended solids is higher than 0.8. The sludge from steel-making shows a promising removal efficiency to use as an alternative to magnetite although a higher mass ratio to the suspended solids is necessary compared with the magnetite.

Keywords

Magnetic Fluid Separation Suspended Solids Livestock Wastewater Magnetic Fine Powders

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