Effect of pore size on the filtration characteristics of ceramic membrane for membrane bioreactors.

Shimizu, Yasutoshi; Rokudai, Minoru; Tohya, Sachio; Kayawake, Eisuke; Yazawa, Tetsuo; Tanaka, Hiroshi; Eguchi, Kiyohisa

doi:10.1252/kakoronbunshu.15.322

Cited by 3 publications

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“…The membrane surface charge is strongly affected by the pH and ionic strength of the mixed liquor. Shimizu et al (1989) reported that negatively charged inorganic membranes fouled less rapidly than neutral or positively charged membranes during filtration of an anaerobic broth. They attributed the difference to stronger electrical repulsion between negatively charged colloids in the mixed liquor and membrane surface.…”

Section: Parameters Governing Permeate Flux In An Anaerobic Membrane mentioning

confidence: 99%

“… Shimizu et al (1989) reported that the permeate flux that could be maintained in an AnMBR operated under stable, steady‐state conditions was approximately twice that which could be maintained under nonstable conditions. These results may be a result of the different amounts of soluble microbial products that are produced under steady‐ and non‐steady‐state conditions.…”

Section: Parameters Governing Permeate Flux In An Anaerobic Membrane mentioning

confidence: 99%

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Parameters Governing Permeate Flux in an Anaerobic Membrane Bioreactor Treating Low‐Strength Municipal Wastewaters: A Literature Review

Bérubé¹,

Hall²,

Sutton³

2006

Water Environment Research

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The objective of this review was to conduct a comprehensive literature survey to identify the parameters that govern the permeate flux in an anaerobic membrane bioreactor (AnMBR) treating municipal wastewater. Based on the survey, research to date indicates that the optimal membrane system for an AnMBR consists of an organic, hydrophilic, and negatively charged membrane with a pore size of approximately 0.1 lm. The use of both external and submerged membrane configurations shows promise. The operating parameters that affect permeate flux in an external membrane system are transmembrane pressure (TMP) and cross-flow velocity. The operating parameters that affect permeate flux in a submerged membrane system are TMP, sparging intensity, and duration of the relaxation period. Both cross-flow velocity and sparging intensity impart a significant amount of shear force on the biomass in an AnMBR. High shear forces can reduce the microbial activity in an AnMBR. In addition, high shear forces can reduce the size of the biosolids in the mixed liquor and increase the release of soluble microbial products. In this respect, external and submerged membrane systems are expected to perform differently because the magnitude of the shear forces to which the biomass is exposed in an external membrane system is significantly greater than that in a submerged system. The size of the biosolid particles and concentration of soluble microbial products in the mixed liquor affect permeate flux. Higher concentrations of soluble microbial products may be present in the mixed liquor when an AnMBR is operated at relatively low operating temperatures. Aerobic polishing following anaerobic treatment can potentially significantly reduce the concentration of some components of the soluble microbial products in the mixed liquor. It is not possible to remove the foulant layer on an organic membrane with caustic cleaning alone. Acidic cleaning or acidic cleaning followed by caustic cleaning is required to remove the foulant layer. This suggests that both biological/organic and inorganic material contribute to membrane fouling. Water Environ. Res., 78, 887 (2006).

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Section: Parameters Governing Permeate Flux In An Anaerobic Membrane mentioning

confidence: 99%

Section: Parameters Governing Permeate Flux In An Anaerobic Membrane mentioning

confidence: 99%