Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Application of fluorescent particles as a tracer to detect the membrane surface damage in a pilot scale membrane bioreactor

형광입자를 이용한 분리막 표면 검측 방법의 파일럿 규모 플랜트 적용

  • 김초아 (세종대학교 환경에너지융합학과) ;
  • 김희준 (지우이앤이주식회사) ;
  • 조진우 (세종대학교 환경에너지융합학과)
  • Received : 2016.01.04
  • Accepted : 2016.01.15
  • Published : 2016.02.28
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Abstract

In this study, a fluorescent silica nano particle is used as the surrogate for challenging test of membrane surface integrity. The particles are functionalized by a fluorescent dying agent so that as an ultraviolet light is imposed a bright fluorescent image from the particles can be taken. If a membrane surface is damaged and has a compromised part larger than the size of surrogate the fluorescent particles would pass through and contained in the permeate. An operator can directly notice whether the membrane surface is damaged or not by detecting a fluorescent image taken from the permeate. Additionally, the size of compromised part is estimated through analysing the fluorescent image in which we surmise the mass of particles included in the permeate by calculating an average RGB value of the image. The pilot scale experiments showed that this method could be applied successfully to determine if a membrane surface had a damaged parts regardless of the test condition. In the testing on the actual damaged area of $4.712mm^2$, the lowest error of estimating the damaged area was -1.32% with the surrogate concentration of 80 mg/L, flux of $40L/m^2/hr$ for 25 minutes of detection. A further study is still going on to increase the lowest detection limit and thus decrease the error of estimation.

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References

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