The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Kyung Guen Song - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic–aerobic MBRs
    Bioprocess and Biosystems Engineering, 2012
    Co-Authors: Bo-kyung Choi, Sung Kyu Maeng, Kyung Guen Song
    Abstract:

    Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional Batch Filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m^2/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.

  • Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic-aerobic MBRs
    Bioprocess and Biosystems Engineering, 2012
    Co-Authors: Jung Yeol Lee, Kyu-hong Ahn, Bo-kyung Choi, Sung Kyu Maeng, Kyung Guen Song
    Abstract:

    Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional Batch Filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m(2)/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.

Bo-kyung Choi - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic–aerobic MBRs
    Bioprocess and Biosystems Engineering, 2012
    Co-Authors: Bo-kyung Choi, Sung Kyu Maeng, Kyung Guen Song
    Abstract:

    Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional Batch Filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m^2/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.

  • Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic-aerobic MBRs
    Bioprocess and Biosystems Engineering, 2012
    Co-Authors: Jung Yeol Lee, Kyu-hong Ahn, Bo-kyung Choi, Sung Kyu Maeng, Kyung Guen Song
    Abstract:

    Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional Batch Filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m(2)/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.

Sung Kyu Maeng - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic–aerobic MBRs
    Bioprocess and Biosystems Engineering, 2012
    Co-Authors: Bo-kyung Choi, Sung Kyu Maeng, Kyung Guen Song
    Abstract:

    Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional Batch Filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m^2/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.

  • Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic-aerobic MBRs
    Bioprocess and Biosystems Engineering, 2012
    Co-Authors: Jung Yeol Lee, Kyu-hong Ahn, Bo-kyung Choi, Sung Kyu Maeng, Kyung Guen Song
    Abstract:

    Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional Batch Filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m(2)/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.

Hang-sik Shin - One of the best experts on this subject based on the ideXlab platform.

  • Sludge characteristics and their contribution to microFiltration in submerged membrane bioreactors
    Journal of Membrane Science, 2003
    Co-Authors: Seoktae Kang, Hang-sik Shin
    Abstract:

    This study focused on the physicochemical and biological characteristics of sludge in submerged membrane bioreactors (MBRs) at various sludge retention times (SRT) and their effect on microFiltration and membrane fouling. Three lab-scale submerged MBRs at SRT of 20, 40, and 60 days were performed at a constant permeate flux of 9 l/(m2 h) with hollow fiber microFiltration membranes (hydrophilized polypropylene; nominal pore size=0.4 μm). In order to evaluate the relative contribution of microbial floc and supernatant to the membrane fouling, supernatant was separated from the sludge by centrifugation at 366 rad/s for 5 min. Batch Filtration experiments with the same configuration showed that the relative contribution of supernatant to overall membrane fouling was higher at SRT of 20 days (37%) than at SRT of 40 (28%) and 60 days (29%), whereas the overall fouling resistance increased as SRT prolonged. Hydrophobicity (correlation coefficient, r=0.86; significant value, P

  • sludge characteristics and their contribution to microFiltration in submerged membrane bioreactors
    Journal of Membrane Science, 2003
    Co-Authors: Seoktae Kang, Hang-sik Shin
    Abstract:

    This study focused on the physicochemical and biological characteristics of sludge in submerged membrane bioreactors (MBRs) at various sludge retention times (SRT) and their effect on microFiltration and membrane fouling. Three lab-scale submerged MBRs at SRT of 20, 40, and 60 days were performed at a constant permeate flux of 9 l/(m2 h) with hollow fiber microFiltration membranes (hydrophilized polypropylene; nominal pore size=0.4 μm). In order to evaluate the relative contribution of microbial floc and supernatant to the membrane fouling, supernatant was separated from the sludge by centrifugation at 366 rad/s for 5 min. Batch Filtration experiments with the same configuration showed that the relative contribution of supernatant to overall membrane fouling was higher at SRT of 20 days (37%) than at SRT of 40 (28%) and 60 days (29%), whereas the overall fouling resistance increased as SRT prolonged. Hydrophobicity (correlation coefficient, r=0.86; significant value, P<0.05), surface charge (r=0.87, P<0.05) and microbial activity (r=−0.87, P<0.05), which were related to composition and properties of extracellular polymeric substances (EPS), appeared key parameters relating to fouling by microbial floc. However, no remarkable factor was found in fouling caused by supernatant.

Jung Yeol Lee - One of the best experts on this subject based on the ideXlab platform.

  • Characteristics of flux and gel layer on microfilter and non-woven fabric filter surface based on anoxic-aerobic MBRs
    Bioprocess and Biosystems Engineering, 2012
    Co-Authors: Jung Yeol Lee, Kyu-hong Ahn, Bo-kyung Choi, Sung Kyu Maeng, Kyung Guen Song
    Abstract:

    Non-woven fabric filter- (NWFF) and microfilter-MBR modules were made using 100 μm polypropylene and 0.25 μm polyethylene materials, respectively. The performances and mechanisms of the two processes were investigated, including additional Batch Filtration tests to find the function of the dynamic gel layer on the membrane surface. The HRT of both MBRs was 9 h and the operating permeate flux was 13 L/m(2)/h. The two MBRs consisted of an anoxic and aerobic reactor. The NWFF or microfilter (MF) was submerged in each of the aerobic reactors. The two MBRs showed similar performances for the removal of organic matters, suspended solids and nitrogen. Cake formation on the NWFF contributed to major resistance, while the gel layer on the microfilter or internal fouling of the pores played a key role in the fouling of the membrane surface. The amount of soluble extracellular polymer substances (EPS) (13 mg/L) of the attached sludge on the NWFF surface was larger than that (11 mg/L) of that suspended sludge. Consequently, the functional gel layer for the coarse and microfilter is established based on the relationship among the EPS, transmembrane pressure and MLSS.