Difference in membrane fouling in membrane bioreactors (MBRs) caused by membrane polymer materials

Yamato, Nobuhiro; Kimura, Katsuki; Miyoshi, Takayuki; Watanabe, Yoshimasa

doi:10.1016/j.memsci.2006.03.009

Cited by 158 publications

(66 citation statements)

References 33 publications

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“…1 and Table 4, a quantitative relationship between the degree of physically irreversible fouling and the amount of extracted foulants was not established in MBR2. This result is in accordance with our previous studies (Kimura et al, 2005b;Yamato et al, 2006). The amount of extracted foulants cannot explain the degree of membrane fouling.…”

Section: Characteristics Of Foulants Extracted From Fouled Membranessupporting

confidence: 93%

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Seasonal variation in membrane fouling in membrane bioreactors (MBRs) treating municipal wastewater

et al. 2009

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We investigated seasonal variation in membrane fouling in membrane bioreactors (MBRs) treating municipal wastewater regarding the difference between physically reversible and irreversible fouling. Two separate MBRs with different solid retention times (SRTs) operated in parallel for about 200 days including high-and low-temperature periods to evaluate the effect of operating conditions on seasonal variation of membrane fouling. Seasonal variations of both types of membrane fouling (i.e., physically reversible and irreversible fouling) were observed for the MBR with short SRT (13 days). However, in the MBR with long SRT (50 days), there were no significant seasonal variations in both types of membrane fouling. In the MBR with short SRT, the trends in the seasonal variation in the development rates of physically reversible and irreversible fouling were different. Physically reversible fouling was more significant in the low-temperature period, while physically irreversible fouling developed more rapidly in the high-temperature period. The development rates of physically reversible fouling can be related to the concentration of dissolved organic matter in the mixed liquor suspension of MBRs; whereas those of physically irreversible fouling could not be explained by the concentration of dissolved organic matter. The characteristics of dissolved organic matter differed depending on the temperature period, and the trends of dissolved organic matter variation in mixed liquor were similar with those of foulants that caused physically irreversible fouling. The results obtained in this study indicated that seasonal variation in physically reversible and irreversible fouling is related to changes in quantity and quality of organic matter, respectively.

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Section: Characteristics Of Foulants Extracted From Fouled Membranessupporting

confidence: 93%

“…In addition, seasonal variation in both types of membrane fouling became less significant when MBRs were operated with long SRTs. (Yamato et al, 2006), these parameters could be related to the development rates of physically irreversible fouling.…”

Section: Continuous Operation Of Pilot-scale Mbrsmentioning

confidence: 99%

Seasonal variation in membrane fouling in membrane bioreactors (MBRs) treating municipal wastewater

et al. 2009

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“…Therefore, in this study we focused on analyzing the organic matter that contributes to physically irreversible fouling. Since physically irreversible fouling is mainly caused by dissolved matter [11], we focused on analyzing the profiles of dissolved proteins contained in the mixed liquor suspension. A solution containing dissolved organic matter was obtained by centrifugation (4800 rpm; 5 min) followed by filtration using a membrane filter paper with a pore size of 0.45 µm.…”

Section: Sample Collectionmentioning

confidence: 99%

Characteristics of proteins involved in membrane fouling in membrane bioreactors (MBRs) treating municipal wastewater: the application of metaproteomic analyses

Miyoshi¹,

Aizawa

Kimura

et al. 2011

Desalination and Water Treatment

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We investigated the relationship between the nature of proteins and their fouling propensities in pilotscale membrane bioreactors (MBRs) treating real municipal wastewater with two-dimensional polyacrylamide gel electrophoresis (2D-PAGE). In 2D-PAGE, proteins are separated based on their isoelectric points and molecular weights, and therefore, information can be obtained on the nature of the proteins. Foulants extracted from fouled membranes at the end of continuous operation and organic matter contained in mixed liquor suspension were analyzed by 2D-PAGE, and the results were compared. This analysis was performed for two identical MBRs operated under different solid retention times (SRT) to investigate the effect of the operating condition on the types of proteins with high fouling propensities. In the MBR operated with a long SRT, the presence of proteins that appeared in the neutral pH range was more pronounced in the extracted foulant. Because the pH of the mixed liquor suspension was in the range of 6-7 throughout the continuous operation, the difference in protein profiles between the extracted foulant and the organic matter contained in the mixed liquor suspension in the MBR operated with a long SRT can be explained by a decrease in solubility of a protein at its isoelectric point. In contrast, in the MBR operated with a short SRT, the presence of proteins that appeared in the acidic region (pH 3-5) was more prominent in the extracted foulant compared with the organic matter contained in the mixed liquor suspension. The results obtained in this study imply that dominant fouling mechanisms differed depending on the operating condition.

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“…Each reactor was fed with 1 L of synthetic wastewater whose COD level was 680 mg/L. The COD level in the reactor was measured to calculate the yield coefficient (Y) and the endogenous respiration coefficient (kd) from the relationship between microorganisms and COD (Yamamoto et al, 2006). The experimental method is the same that of previous paper (Shin, 2009) …”

Section: Operating Conditionsmentioning

confidence: 99%

Optimum Operation of a PVDF-type Hollow Fiber Membrane Bioreactor for Continuous Sewage Treatment

Shin¹

2010

Journal of Environmental Science International

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A membrane bioreactor (MBR) was designed using polyvinylidene fluoride(PVDF)-type hollow fiber membrane modules with a treatment capacity of 10 ton/day. A pilot plant was installed in a sewage treatment plant and was operated with an intermittent aeration method which avoids any concentration gradient of suspended solids (SS) in the MBR. For continuous operation, the pilot plant was first tested with influent (mixed liquor suspended solid:MLSS of 1000-2000 mg/L) of aeration tanks in the sewage treatment plant. The MBR was pre-treated with washing water, 10% ethanol solution, 5% NaOCl solution and finally washing water, one after another. To demonstrate the effect of the MBR on sewage treatment, compared with conventional activated sludge processes, we investigated the relationships among permeate amount (LMH), change in operation conditions, influent MLSS level and sludge production. It was found that the optimum aeration rate and suction pressure were 0.3 m 3 /min and 30~31 cmHg, respectively. Under stable conditions in aeration, suction pressure, influent flow rate and drainage, the SS removal efficiency was more than 99.99% even when the MLSS loading rate changes. Compared with conventional activated sludge processes, the MBR was more effective in cost reduction by 27% based on permeate amount and by 51.5% on sludge production.

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Difference in membrane fouling in membrane bioreactors (MBRs) caused by membrane polymer materials

Cited by 158 publications

References 33 publications

Seasonal variation in membrane fouling in membrane bioreactors (MBRs) treating municipal wastewater

Seasonal variation in membrane fouling in membrane bioreactors (MBRs) treating municipal wastewater

Characteristics of proteins involved in membrane fouling in membrane bioreactors (MBRs) treating municipal wastewater: the application of metaproteomic analyses

Optimum Operation of a PVDF-type Hollow Fiber Membrane Bioreactor for Continuous Sewage Treatment

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