[논문]MBR반응기의 막오염방지를 위한 활성탄과 응집제를 이용한 전처리에 관한 연구

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The aim of this study was to investigate the characteristics of membrane fouling caused by soluble organic materials in a membrane bioreactor process. For the removal of filterable organic materials (FOC) smaller than $1{\mu}m$, coagulants and activated carbon were added. A membrane biore...

The aim of this study was to investigate the characteristics of membrane fouling caused by soluble organic materials in a membrane bioreactor process. For the removal of filterable organic materials (FOC) smaller than $1{\mu}m$, coagulants and activated carbon were added. A membrane bioreactor using a submerged $17{\mu}m$ metal sieve was operated in laboratory scale to examine the possibility of membrane fouling control. As the dosage of GAC and coagulant increased, the residual FOC concentration decreased and the permeate flow rate increased markedly. The permeate flux increased with an increased PACl addition at the range from 0 to 50 mg/l. At coagulant dosage of 27mg/l, the removal of FOC was about 46% and the flux increased to 3.5 times compared to the case without PACl addition. The permeate flux increased gradually with an increase in GAC dosage. At GAC dosage of 50mg/L, the permeate flux was about 2 times higher compared that for raw water. The particle in the range of $0.1{\sim}1.0{\mu}m$ were removed effectively by the addition of GAC and coagulant. Higher osage of GAC and coagulant, led to higher removal of FOC. A different set of experiments was also performed to investigate the effect of pretreatment on the permeation ability of MBR system using the metal sieve membrane. After 40 hours of operation, the permeate flux was about 1,000 ($L/m^2-hr$), which is 20 times higher compared to the results in literature. It is likely that combined pretreatment using coagulant and activated carbon was the most effective to resolve membrane fouling problems. Moreover, the continuous operations could be successful by applying this pretreatment method.

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문제 정의

The aim of this study is to investigate membrane fouling characteristics caused by the soluble organic materials in the membrane bioreactor system process. For the removal of the filterable organic materials (FOC) less than 1µm, coagulants and granular activated carbon were added as a pretreatment before MF filtration.

제안 방법

A stock solution for feed water was prepared by using mixed liquor of activated sludge, and it was stored at 4℃ for subsequent uses. To estimate the FOC removal efficiencies by different PAC and coagulant dosages, jar tests were carried out at a stirring speed of 150rpm for 15~30min using 1L beakers and the water pH was controlled about 7 using 0.1N NaOH or 0.1N HCl solutions.
To investigate the performance of GAC dosage on FOC removal, batch runs were done at different GAC dosages. Figure 4 shows the results of GAC dosages on permeate flux decline after 30 min contact.

성능/효과

0µm filter was the primary factor affecting flux decline, but it was effectively controlled with the integrated GAC + coagulant pretreatment. This study concluded that GAC addition after the coagulation reaction is the most effective process of the prevention of membrane fouling problems.

참고문헌 (9)

Adham S.S., Jacangelo J.G. and Laine J.-M. (1996) Characteristics and costs of MF and UF plants, J. Am. Water Works. Assoc., 88, 22-31
Adham S.S., Snoeyink V.L., Clark M.M. and Bersillon J.-L. (1991) Predicting and verifying organics removal by PAC in an UF system, J. Am. Water Works. Assoc., 83, 81-91

상세보기
Bura. R, M. Cheung, B. Liao, J. Finlayson, B.C. Lee, I.G. Droppo, G.G. Leppard and S.N. Liss (1998) Composition of extracellular polymeric substances in activated sludge floc matrix, Wat. Sci. Tech. 37, 325-333
Gan Q., R.W. Field, M.R. Bird, R. England, J.A. Howell, M.T. McKechine, C.L. O'Shaugessy (1997) Beer clarification by cross-flow microfiltration: fouling mechanisms and flux enhancement, Chem. Eng. Res. Des., 75, 3-8

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Kim J.-S., Lee S.-J., Yoon S.-H. and Lee C.-H. (1996) Competitive adsorption of trace organics on membrane and powdered activated carbon in powdered activated carbonultrafiltration system, Water Sci. Technol., 34, 223-229
Mukai. T, K., Murakami, K. Takimoto, T. Kohno, and M. Okada (1997) Ultrafiltration behavior of extracellular and metabolic products in activated sludge system with UF separation process, Proc of Asian Water quality 97, 1499-1504
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Pribazari M., Badriyha B.N. and Ravindran V. (1992) MFPAC for treating waters contaminated with natural and synthetic organics, J. Am. Water Works. Assoc., 84, 95-103

상세보기
Wiesner M.R., Hackney J., Sethi S., Jacangelo J.G. and Laine J.-M (1994) Cost estimates for membrane filtration and conventional treatment, J. Am. Water Works. Assoc., 86, 33-41

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MBR반응기의 막오염방지를 위한 활성탄과 응집제를 이용한 전처리에 관한 연구
Using Coagulant and Activated Carbon as Pretreatment for Membrane Fouling Control in MBR (Membrane Bioreactor) 원문보기

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MBR반응기의 막오염방지를 위한 활성탄과 응집제를 이용한 전처리에 관한 연구 Using Coagulant and Activated Carbon as Pretreatment for Membrane Fouling Control in MBR (Membrane Bioreactor) 원문보기

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MBR반응기의 막오염방지를 위한 활성탄과 응집제를 이용한 전처리에 관한 연구
Using Coagulant and Activated Carbon as Pretreatment for Membrane Fouling Control in MBR (Membrane Bioreactor) 원문보기

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