The Experts below are selected from a list of 2958 Experts worldwide ranked by ideXlab platform
Alain Rapaport - One of the best experts on this subject based on the ideXlab platform.
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Corrigendum to “Design, analysis and validation of a simple dynamic model of a Submerged Membrane Bioreactor”
Water Research, 2016Co-Authors: Guilherme Araujo Pimentel, Jerome Harmand, Alain Vande Wouver, Alain RapaportAbstract:In this study, a simple dynamic model of a Submerged Membrane Bioreactor (sMBR) is proposed, which would be suitable for process control. The system dynamics is first analyzed showing the existence of three different time scales. The existence of slow-fast dynamics is central to the development of a dedicated parameter estimation procedure. The proposed model structure is validated using realistic simulation data from a detailed simulator built in a well-established environment, namely GPS-X. Finally, a nonlinear model predictive control is designed to illustrate the potential of the developed model within a model-based control structure. The problem of water treatment in a recirculating aquaculture system is considered as an application example.
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Design, Analysis and Validation of a Simple Dynamic Model of a Submerged Membrane Bioreactor
Water Research, 2015Co-Authors: Guilherme Araujo Pimentel, Alain Vande Wouwer, Jerome Harmand, Alain RapaportAbstract:In this study, a simple dynamic model of a Submerged Membrane Bioreactor (sMBR) is proposed, which would be suitable for process control. The system dynamics is first analyzed showing the existence of three different time scales. The existence of slow-fast dynamics is central to the development of a dedicated parameter estimation procedure. The proposed model structure is validated using realistic simulation data from a detailed simulator built in a well-established environment, namely GPS-X. Finally, a nonlinear model predictive control is designed to illustrate the potential of the developed model within a model-based control structure. The problem of water treatment in a recirculating aquaculture system is considered as an application example.
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Design, analysis and validation of a simple dynamic model of a Submerged Membrane Bioreactor
Water research, 2014Co-Authors: Guilherme Araujo Pimentel, Jerome Harmand, Alain Vande Wouwer, Alain RapaportAbstract:In this study, a simple dynamic model of a Submerged Membrane Bioreactor (sMBR) is proposed, which would be suitable for process control. In order to validate the proposed model structure, informative data sets are generated using a detailed simulator built in a well-established environment, namely GPS-X. The model properties are studied, including equilibrium points, stability, and slow/fast dynamics (three different time scales). The existence of slow-fast dynamics is central to the development of a dedicated parameter estimation procedure. Finally, a nonlinear model predictive control is designed to illustrate the potential of the developed model within a model-based control structure. The problem of water treatment in a recirculating aquaculture system is considered as an application example.
Wenshan Guo - One of the best experts on this subject based on the ideXlab platform.
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Removal and degradation mechanisms of sulfonamide antibiotics in a new integrated aerobic Submerged Membrane Bioreactor system.
Bioresource technology, 2018Co-Authors: Yu Zhihao, Xinbo Zhang, Huu Hao Ngo, Wenshan Guo, Haitao Wen, Lijuan Deng, Jianbo GuoAbstract:Abstract A novel laboratory-scale aerobic Submerged Membrane Bioreactor integrating sponge-plastic biocarriers (SPSMBR) was conducted to study the removal and degradation mechanisms of sulfonamide antibiotics (SAs). Experimental results indicated that SPSMBR had a better removal of sulfadiazine (91% SDZ) and sulfamethoxazole (88% SMZ) than that of a conventional aerobic Submerged Membrane Bioreactor (CSMBR) (76% SDZ and 71% SMZ, respectively). Material balance calculations suggested that biodegradation is the primary removal mechanism of SDZ and SMZ. Protein (tyrosine-like materials) significantly affected the removal of SAs. Moreover, the SPSMBR exhibited its better performance in removing SAs due to more abundance of tyrosine-like materials. The 16S rRNA sequencing showed that biocarriers could promote the enrichment of slow growing bacteria, especially Thermomonas, associated with the removal of SAs. Valuable insights into the removal and degradation mechanisms of SAs in the SPSMBR systems are documented here.
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New and practical mathematical model of Membrane fouling in an aerobic Submerged Membrane Bioreactor
Bioresource technology, 2017Co-Authors: Mst Fazana Rahman Zuthi, Huu Hao Ngo, Wenshan Guo, Siqing Xia, Duc Long Nghiem, Faisal I. Hai, Yi LiuAbstract:Abstract This study aimed to develop a practical semi-empirical mathematical model of Membrane fouling that accounts for cake formation on the Membrane and its pore blocking as the major processes of Membrane fouling. In the developed model, the concentration of mixed liquor suspended solid is used as a lumped parameter to describe the formation of cake layer including the biofilm. The new model considers the combined effect of aeration and backwash on the foulants’ detachment from the Membrane. New exponential coefficients are also included in the model to describe the exponential increase of transMembrane pressure that typically occurs after the initial stage of an MBR operation. The model was validated using experimental data obtained from a lab-scale aerobic sponge-Submerged Membrane Bioreactor (MBR), and the simulation of the model agreed well with the experimental findings.
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1 Comparison of the Performance of Submerged Membrane Bioreactor (SMBR) and Submerged Membrane Adsorption Bioreactor (SMABR)
2016Co-Authors: Wenshan Guo, Huu Hao Ngo, Saravanamuthu Vigneswaran, W Xing, Pavan GotetiAbstract:This study focuses on comparing the performance of Submerged Membrane Bioreactor (SMBR) and Submerged Membrane adsorption Bioreactor (SMABR) over a period of 20 days at a hydraulic retention time (HRT) of 3.1 hours. The effects of PAC on critical flux and Membrane fouling were also investigated. The SMABR exhibited better results in terms of mixed liquor suspended solids (MLSS) growth, DOC removal (over 96%), COD removal (over 95%), transMembrane pressure (TMP) and oxygen uptake rate. Nearly 100 % of bacteria and 100 % removals of total coliforms were removed in both systems. The addition of PAC could maintain the critical flux at a lower TMP value (7.5 kPa), while irreversible fouling caused by PAC occurred when the filtration flux exceeded critical flux
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A new combined inorganic–organic flocculant (CIOF) as a performance enhancer for aerated Submerged Membrane Bioreactor
Separation and Purification Technology, 2010Co-Authors: Tien Thanh Nguyen, Huu Hao Ngo, Wenshan Guo, Saravanamuthu VigneswaranAbstract:Abstract In this study, a new combined inorganic–organic flocculant (CIOF) of FeCl3 and Membrane performance enhancer (MPE50) was prepared and added to an aerated Submerged Membrane Bioreactor (SMBR). The effects of CIOF on the performance of an aerated Submerged Membrane Bioreactor (SMBR) were evaluated. The results indicated that the SMBR with CIOF addition could remove almost 100% total phosphate while eliminating over 90% ammonia (NH4-N) and dissolved organic carbon (DOC) during an 80-day of operation. The respiration tests revealed that the specific oxygen uptake rate (SOUR) was stable around 1.5–2.0 mg O2/gMLVSS h. The sludge volume index (SVI) of less than 100 mL/g during the operation showed the importance of CIOF on the improvement of settling properties of the sludge. Soluble carbohydrate concentration was also well correlated with DOC of the supernatant. CIOF was successful in the reduction of fouling of Membrane as the Membrane was only chemically cleaned after 53 days of operation.
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comparison of the performance of Submerged Membrane Bioreactor smbr and Submerged Membrane adsorption Bioreactor smabr
Bioresource Technology, 2008Co-Authors: Wenshan Guo, Huu Hao Ngo, S Vigneswaran, W Xing, Pavan GotetiAbstract:This study focuses on comparing the performance of Submerged Membrane Bioreactor (SMBR) and Submerged Membrane adsorption Bioreactor (SMABR) over a period of 20 days at a hydraulic retention time (HRT) of 3.1 h. The effects of PAC on critical flux and Membrane fouling were also investigated. The SMABR exhibited better results in terms of mixed liquor suspended solids (MLSS) growth, DOC removal (over 96%), COD removal (over 95%), transMembrane pressure (TMP) and oxygen uptake rate. Nearly 100% of bacteria and 100% of total coliforms were removed in both systems. The addition of PAC could maintain the critical flux at a lower TMP value (7.5 kPa), while irreversible fouling caused by PAC occurred when the filtration flux exceeded critical flux.
Hangsik Shin - One of the best experts on this subject based on the ideXlab platform.
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high reuse potential of effluent from an innovative vertical Submerged Membrane Bioreactor treating municipal wastewater
Desalination, 2007Co-Authors: Soryong Chae, Seoktae Kang, S M Lee, E S Lee, Yoshimasa Watanabe, Hangsik ShinAbstract:The main objective of this study is to investigate the reuse possibility of effluent from a vertical Submerged Membrane Bioreactor (VSMBR) treating municipal wastewater. The average removal efficiencies of total chemical oxygen demand (COD), total nitrogen (T-N), and total phosphorus (T-P) were 96, 74, and 78%, respectively at 8-h hydraulic retention time (HRT) and 60-day sludge retention time (SRT). Additional removal of organic matter and improved nitrification and denitrification efficiencies were found by the formation of a dynamic Membrane. The effluent quality of the vertical Submerged Membrane Bioreactor (VSMBR) could satisfy most items in the current drinking water standards of Korea and the WHO (World Health Organization). Accordingly, the reuse of the effluent from the VSMBR could be possible for various purposes such as toilet flushing, sprinkling, and car washing.
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Mitigated Membrane fouling in a vertical Submerged Membrane Bioreactor (VSMBR)
Journal of Membrane Science, 2006Co-Authors: Soryong Chae, Seoktae Kang, Yongtae Ahn, Hangsik ShinAbstract:In a laboratory-scale study, characteristics of Membrane fouling in an A/O (anoxic/oxic) series Membrane Bioreactor (MBR) and in a vertical Submerged Membrane Bioreactor (VSMBR) treating synthetic wastewater were compared under the same operating conditions. Accordingly, fouling characteristics of a pilot-scale VSMBR treating municipal wastewater were studied under various operating conditions. Various physical, chemical, and biological factors were used to describe Membrane resistances. As a result, it was concluded that high concentrations of extracellular polymeric substances (EPS), high viscosity and a high sludge volume index (SVI) corresponded to high Membrane resistance indicating severe Membrane fouling in both the laboratory-scale MBRs and the pilot-scale VSMBR. In addition, high fouling potential was observed in the pilot-scale VSMBR at 60-day sludge retention time (SRT). In this case, as hydraulic retention time (HRT) decreased from 10 to 4 h, EPS concentrations increased and the average particle size increased, leading to reduced settling of the sludge and increased Membrane fouling. To mitigate fouling, two different methods using air bubble jets were adopted in the pilot-scale VSMBR. As a result, it was found that air backwashing was more efficient for fouling mitigation than was air scouring.
Huu Hao Ngo - One of the best experts on this subject based on the ideXlab platform.
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Removal and degradation mechanisms of sulfonamide antibiotics in a new integrated aerobic Submerged Membrane Bioreactor system.
Bioresource technology, 2018Co-Authors: Yu Zhihao, Xinbo Zhang, Huu Hao Ngo, Wenshan Guo, Haitao Wen, Lijuan Deng, Jianbo GuoAbstract:Abstract A novel laboratory-scale aerobic Submerged Membrane Bioreactor integrating sponge-plastic biocarriers (SPSMBR) was conducted to study the removal and degradation mechanisms of sulfonamide antibiotics (SAs). Experimental results indicated that SPSMBR had a better removal of sulfadiazine (91% SDZ) and sulfamethoxazole (88% SMZ) than that of a conventional aerobic Submerged Membrane Bioreactor (CSMBR) (76% SDZ and 71% SMZ, respectively). Material balance calculations suggested that biodegradation is the primary removal mechanism of SDZ and SMZ. Protein (tyrosine-like materials) significantly affected the removal of SAs. Moreover, the SPSMBR exhibited its better performance in removing SAs due to more abundance of tyrosine-like materials. The 16S rRNA sequencing showed that biocarriers could promote the enrichment of slow growing bacteria, especially Thermomonas, associated with the removal of SAs. Valuable insights into the removal and degradation mechanisms of SAs in the SPSMBR systems are documented here.
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New and practical mathematical model of Membrane fouling in an aerobic Submerged Membrane Bioreactor
Bioresource technology, 2017Co-Authors: Mst Fazana Rahman Zuthi, Huu Hao Ngo, Wenshan Guo, Siqing Xia, Duc Long Nghiem, Faisal I. Hai, Yi LiuAbstract:Abstract This study aimed to develop a practical semi-empirical mathematical model of Membrane fouling that accounts for cake formation on the Membrane and its pore blocking as the major processes of Membrane fouling. In the developed model, the concentration of mixed liquor suspended solid is used as a lumped parameter to describe the formation of cake layer including the biofilm. The new model considers the combined effect of aeration and backwash on the foulants’ detachment from the Membrane. New exponential coefficients are also included in the model to describe the exponential increase of transMembrane pressure that typically occurs after the initial stage of an MBR operation. The model was validated using experimental data obtained from a lab-scale aerobic sponge-Submerged Membrane Bioreactor (MBR), and the simulation of the model agreed well with the experimental findings.
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1 Comparison of the Performance of Submerged Membrane Bioreactor (SMBR) and Submerged Membrane Adsorption Bioreactor (SMABR)
2016Co-Authors: Wenshan Guo, Huu Hao Ngo, Saravanamuthu Vigneswaran, W Xing, Pavan GotetiAbstract:This study focuses on comparing the performance of Submerged Membrane Bioreactor (SMBR) and Submerged Membrane adsorption Bioreactor (SMABR) over a period of 20 days at a hydraulic retention time (HRT) of 3.1 hours. The effects of PAC on critical flux and Membrane fouling were also investigated. The SMABR exhibited better results in terms of mixed liquor suspended solids (MLSS) growth, DOC removal (over 96%), COD removal (over 95%), transMembrane pressure (TMP) and oxygen uptake rate. Nearly 100 % of bacteria and 100 % removals of total coliforms were removed in both systems. The addition of PAC could maintain the critical flux at a lower TMP value (7.5 kPa), while irreversible fouling caused by PAC occurred when the filtration flux exceeded critical flux
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A new combined inorganic–organic flocculant (CIOF) as a performance enhancer for aerated Submerged Membrane Bioreactor
Separation and Purification Technology, 2010Co-Authors: Tien Thanh Nguyen, Huu Hao Ngo, Wenshan Guo, Saravanamuthu VigneswaranAbstract:Abstract In this study, a new combined inorganic–organic flocculant (CIOF) of FeCl3 and Membrane performance enhancer (MPE50) was prepared and added to an aerated Submerged Membrane Bioreactor (SMBR). The effects of CIOF on the performance of an aerated Submerged Membrane Bioreactor (SMBR) were evaluated. The results indicated that the SMBR with CIOF addition could remove almost 100% total phosphate while eliminating over 90% ammonia (NH4-N) and dissolved organic carbon (DOC) during an 80-day of operation. The respiration tests revealed that the specific oxygen uptake rate (SOUR) was stable around 1.5–2.0 mg O2/gMLVSS h. The sludge volume index (SVI) of less than 100 mL/g during the operation showed the importance of CIOF on the improvement of settling properties of the sludge. Soluble carbohydrate concentration was also well correlated with DOC of the supernatant. CIOF was successful in the reduction of fouling of Membrane as the Membrane was only chemically cleaned after 53 days of operation.
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comparison of the performance of Submerged Membrane Bioreactor smbr and Submerged Membrane adsorption Bioreactor smabr
Bioresource Technology, 2008Co-Authors: Wenshan Guo, Huu Hao Ngo, S Vigneswaran, W Xing, Pavan GotetiAbstract:This study focuses on comparing the performance of Submerged Membrane Bioreactor (SMBR) and Submerged Membrane adsorption Bioreactor (SMABR) over a period of 20 days at a hydraulic retention time (HRT) of 3.1 h. The effects of PAC on critical flux and Membrane fouling were also investigated. The SMABR exhibited better results in terms of mixed liquor suspended solids (MLSS) growth, DOC removal (over 96%), COD removal (over 95%), transMembrane pressure (TMP) and oxygen uptake rate. Nearly 100% of bacteria and 100% of total coliforms were removed in both systems. The addition of PAC could maintain the critical flux at a lower TMP value (7.5 kPa), while irreversible fouling caused by PAC occurred when the filtration flux exceeded critical flux.
Soryong Chae - One of the best experts on this subject based on the ideXlab platform.
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high reuse potential of effluent from an innovative vertical Submerged Membrane Bioreactor treating municipal wastewater
Desalination, 2007Co-Authors: Soryong Chae, Seoktae Kang, S M Lee, E S Lee, Yoshimasa Watanabe, Hangsik ShinAbstract:The main objective of this study is to investigate the reuse possibility of effluent from a vertical Submerged Membrane Bioreactor (VSMBR) treating municipal wastewater. The average removal efficiencies of total chemical oxygen demand (COD), total nitrogen (T-N), and total phosphorus (T-P) were 96, 74, and 78%, respectively at 8-h hydraulic retention time (HRT) and 60-day sludge retention time (SRT). Additional removal of organic matter and improved nitrification and denitrification efficiencies were found by the formation of a dynamic Membrane. The effluent quality of the vertical Submerged Membrane Bioreactor (VSMBR) could satisfy most items in the current drinking water standards of Korea and the WHO (World Health Organization). Accordingly, the reuse of the effluent from the VSMBR could be possible for various purposes such as toilet flushing, sprinkling, and car washing.
-
Mitigated Membrane fouling in a vertical Submerged Membrane Bioreactor (VSMBR)
Journal of Membrane Science, 2006Co-Authors: Soryong Chae, Seoktae Kang, Yongtae Ahn, Hangsik ShinAbstract:In a laboratory-scale study, characteristics of Membrane fouling in an A/O (anoxic/oxic) series Membrane Bioreactor (MBR) and in a vertical Submerged Membrane Bioreactor (VSMBR) treating synthetic wastewater were compared under the same operating conditions. Accordingly, fouling characteristics of a pilot-scale VSMBR treating municipal wastewater were studied under various operating conditions. Various physical, chemical, and biological factors were used to describe Membrane resistances. As a result, it was concluded that high concentrations of extracellular polymeric substances (EPS), high viscosity and a high sludge volume index (SVI) corresponded to high Membrane resistance indicating severe Membrane fouling in both the laboratory-scale MBRs and the pilot-scale VSMBR. In addition, high fouling potential was observed in the pilot-scale VSMBR at 60-day sludge retention time (SRT). In this case, as hydraulic retention time (HRT) decreased from 10 to 4 h, EPS concentrations increased and the average particle size increased, leading to reduced settling of the sludge and increased Membrane fouling. To mitigate fouling, two different methods using air bubble jets were adopted in the pilot-scale VSMBR. As a result, it was found that air backwashing was more efficient for fouling mitigation than was air scouring.
