The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
J. Ramírez-muñoz - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Different Methods for Evaluating the Hydraulics of a Pilot-Scale Upflow Anaerobic Sludge Blanket Reactor
Environmental Processes, 2019Co-Authors: J. I. Pérez Montiel, A. Galindo Montero, J. Ramírez-muñozAbstract:Four methods commonly used in the literature for evaluating the hydraulics of Upflow Anaerobic Sludge Blanket (UASB) reactors were compared in a pilot-scale UASB reactor (518 L). The methods are based on the analysis of the tracer concentration curve in the collection points by using ionic lithium (Li^+) as a tracer. The tracer was collected at two points: in the effluent and in the Sludge Blanket. The methods evaluated were: (i) Qualitative analysis of the Residence Time Distribution (RTD) normalized curve (i.e., dimensionless with respect to concentration and time); (ii) empirical qualitative relations between experimental time and theoretical time by using the time-concentration tracer curve; (iii) dispersion number by using traditional equations; and (iv) dimensional axial dispersion model. The study was performed at theoretical hydraulic residence times (t_0) of 600, 480, 300, 240 and 180 min. The results obtained show that the lack of criteria for defining the flow inside the reactor (plug flow, dispersed-flow or complete-mix flow) yields inconsistencies in methods (ii) and (iii). In contrast, methods (i) and (iv) are consistent with each other and can be considered as complementary. For these last two methods, it was found that there is a dispersed flow in the reactor (effluent), and a complete-mix flow in the region of the Sludge bed and Sludge Blanket. However, method (i) is qualitative and does not relate the flow pattern with the dispersion number or Péclet number that measures the mixing magnitude or the axial dispersion in biological reactors.
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Comparison of Different Methods for Evaluating the Hydraulics of a Pilot-Scale Upflow Anaerobic Sludge Blanket Reactor
Environmental Processes, 2019Co-Authors: J. I. Pérez Montiel, A. Galindo Montero, J. Ramírez-muñozAbstract:Four methods commonly used in the literature for evaluating the hydraulics of Upflow Anaerobic Sludge Blanket (UASB) reactors were compared in a pilot-scale UASB reactor (518 L). The methods are based on the analysis of the tracer concentration curve in the collection points by using ionic lithium (Li+) as a tracer. The tracer was collected at two points: in the effluent and in the Sludge Blanket. The methods evaluated were: (i) Qualitative analysis of the Residence Time Distribution (RTD) normalized curve (i.e., dimensionless with respect to concentration and time); (ii) empirical qualitative relations between experimental time and theoretical time by using the time-concentration tracer curve; (iii) dispersion number by using traditional equations; and (iv) dimensional axial dispersion model. The study was performed at theoretical hydraulic residence times (t0) of 600, 480, 300, 240 and 180 min. The results obtained show that the lack of criteria for defining the flow inside the reactor (plug flow, dispersed-flow or complete-mix flow) yields inconsistencies in methods (ii) and (iii). In contrast, methods (i) and (iv) are consistent with each other and can be considered as complementary. For these last two methods, it was found that there is a dispersed flow in the reactor (effluent), and a complete-mix flow in the region of the Sludge bed and Sludge Blanket. However, method (i) is qualitative and does not relate the flow pattern with the dispersion number or Peclet number that measures the mixing magnitude or the axial dispersion in biological reactors.
Anwar Ahmad - One of the best experts on this subject based on the ideXlab platform.
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integrated application of upflow anaerobic Sludge Blanket reactor for the treatment of wastewaters
Water Research, 2011Co-Authors: Muhammad A Latif, Rumana Ghufran, Zularisam Abdul Wahid, Anwar AhmadAbstract:The UASB process among other treatment methods has been recognized as a core method of an advanced technology for environmental protection. This paper highlights the treatment of seven types of wastewaters i.e. palm oil mill effluent (POME), distillery wastewater, slaughterhouse wastewater, piggery wastewater, dairy wastewater, fishery wastewater and municipal wastewater (black and gray) by UASB process. The purpose of this study is to explore the pollution load of these wastewaters and their treatment potential use in upflow anaerobic Sludge Blanket process. The general characterization of wastewater, treatment in UASB reactor with operational parameters and reactor performance in terms of COD removal and biogas production are thoroughly discussed in the paper. The concrete data illustrates the reactor configuration, thus giving maximum awareness about upflow anaerobic Sludge Blanket reactor for further research. The future aspects for research needs are also outlined.
Jens Ejbye Schmidt - One of the best experts on this subject based on the ideXlab platform.
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Hydraulics of laboratory and full‐scale upflow anaerobic Sludge Blanket (UASB) reactors
Biotechnology and Bioengineering, 2005Co-Authors: Damien J. Batstone, J.l.a. Hernandez, Jens Ejbye SchmidtAbstract:Laboratory-scale upflow anaerobic Sludge Blanket (UASB) reactors are often used as test platforms to evaluate full-scale applications. However, for a given volume specific hydraulic loading rate and geometry, the gas and liquid flows increase proportionally with the cube root of volume. In this communication, we demonstrate that a laboratory-scale reactor had plug-flow hydraulics, while a full-scale reactor had mixed flow hydraulics. The laboratory-scale reactor could be modeled using an existing biochemical model, and parameters identified, but because of computational speed with plug-flow hydraulics, mixed systems are instead recommended for parameter identification studies. Because of the scaling issues identified, operational data should not be directly projected from laboratory-scale results to the full-scale design.
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hydraulics of laboratory and full scale upflow anaerobic Sludge Blanket uasb reactors
Biotechnology and Bioengineering, 2005Co-Authors: Damien J. Batstone, J.l.a. Hernandez, Jens Ejbye SchmidtAbstract:Laboratory-scale upflow anaerobic Sludge Blanket (UASB) reactors are often used as test platforms to evaluate full-scale applications. However, for a given volume specific hydraulic loading rate and geometry, the gas and liquid flows increase proportionally with the cube root of volume. In this communication, we demonstrate that a laboratory-scale reactor had plug-flow hydraulics, while a full-scale reactor had mixed flow hydraulics. The laboratory-scale reactor could be modeled using an existing biochemical model, and parameters identified, but because of computational speed with plug-flow hydraulics, mixed systems are instead recommended for parameter identification studies. Because of the scaling issues identified, operational data should not be directly projected from laboratory-scale results to the full-scale design.
Hossein Farrokhzadeh - One of the best experts on this subject based on the ideXlab platform.
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Innovative anaerobic/upflow Sludge Blanket filtration bioreactor for phosphorus removal from wastewater
Environmental Technology, 2011Co-Authors: Hassan Khorsandi, Bijan Bina, H. Movahedyan, Hossein FarrokhzadehAbstract:Phosphorus is the key element to remove from aquatic environments to limit the growth of aquatic plants and algae and, thus, to control eutrophication. Because the upflow Sludge Blanket filtratio' (USBF) process, without addition of metal salts, entails low efficiency for phosphorus removal, we added an anaerobic reactor to the USBF bioreactor in order to promote the simultaneous removal of phosphorus and nitrogen from wastewater. The results revealed that the anaerobic/USBF bioreactor had a phosphorus removal efficiency up to 86%, with a Sludge retention time (SRT) of 10 days, a hydraulic retention time (HRT) of 24 hours and an optimum COD/N/P ratio of 100/5/1. This ratio also improved the compaction quality of the Sludge Blanket in the USBF clarifier. The average specific phosphate uptake rate in the aerobic zone and the average specific phosphate release rate in the anaerobic reactor were 0.014 mg PO4‐P removed/(g VSS·min) and 0.0525 mg PO4‐P released/(g VSS·min), respectively. Secondary phosphorus rel...
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Innovative anaerobic upflow Sludge Blanket filtration combined bioreactor for nitrogen removal from municipal wastewater
International Journal of Environmental Science and Technology, 2011Co-Authors: Hassan Khorsandi, Hossein Movahedian Attar, Bijan Bina, Hossein FarrokhzadehAbstract:In this research, a novel laboratory scale anaerobic/upflow Sludge Blanket filtration combined bioreactor was designed and operated to improve the efficiency of the upflow Sludge Blanket filtration process for the simultaneous removal of phosphorus and nitrogen from wastewater. The anaerobic/upflow Sludge Blanket filtration technique was developed by adding an anaerobic reactor to its influent and operated by varying the main process parameters in order to gain the optimum conditions. The results showed that biological removal efficiency of nitrogen and preservation of Sludge Blanket strongly depend on wastewater characteristics, hydraulic retention time, Sludge age and process controlling parameters. The combined bioreactor performed a total nitrogen removal efficiency of 96.6 % with the Sludge age of 25 days, total hydraulic retention time of 24 h and optimum "chemical oxygen demand/nitrogen/phosphorus" ratio of 100/ 5/1. This ratio also improved the compaction quality of Sludge Blanket in the upflow Sludge Blanket filtration clarifier. The average specific nitrification and denitrification rates occurred during the process can be expressed as 4.43 mg NOx- N produced/g VSS.d and 5.50 mg NOx-N removed/g VSS.d at the optimum ratio, respectively. To avoid Sludge rising due to denitrification process, the optimum total hydraulic retention time of 16 to 24 h was achieved based on the effluent quality. This study suggested that the anaerobic/upflow Sludge Blanket filtration bioreactor at the optimum operational conditions can be an effective process for removal of nutrients from municipal wastewater.
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Innovative anaerobic/upflow Sludge Blanket filtration bioreactor for phosphorus removal from wastewater.
Environmental technology, 2011Co-Authors: Hassan Khorsandi, Bijan Bina, H. Movahedyan, Hossein FarrokhzadehAbstract:Phosphorus is the key element to remove from aquatic environments to limit the growth of aquatic plants and algae and, thus, to control eutrophication. Because the upflow Sludge Blanket filtratio' (USBF) process, without addition of metal salts, entails low efficiency for phosphorus removal, we added an anaerobic reactor to the USBF bioreactor in order to promote the simultaneous removal of phosphorus and nitrogen from wastewater. The results revealed that the anaerobic/USBF bioreactor had a phosphorus removal efficiency up to 86%, with a Sludge retention time (SRT) of 10 days, a hydraulic retention time (HRT) of 24 hours and an optimum COD/N/P ratio of 100/5/1. This ratio also improved the compaction quality of the Sludge Blanket in the USBF clarifier. The average specific phosphate uptake rate in the aerobic zone and the average specific phosphate release rate in the anaerobic reactor were 0.014 mg PO4-P removed/(g VSS x min) and 0.0525 mg PO4-P released/(g VSS x min), respectively. Secondary phosphorus release in the USBF clarifier was heightened with increasing HRT. Hence, the optimum total HRT can be selected between 16 and 24 hours based on effluent quality. Effluent phosphorus of about 1 mg/L was provided for wastewater with the COD/N/P ratio of 100/5/1 at the Sludge age of 10 days and total HRT of 16 hours. This study illustrated that the anaerobic/USBF bioreactor at the optimum operational conditions can be an effective process for phosphorus removal from municipal wastewater.
Conly L. Hansen - One of the best experts on this subject based on the ideXlab platform.
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Biokinetics of an upflow anaerobic Sludge Blanket reactor treating whey permeate
Bioresource Technology, 2003Co-Authors: Seokhwan Hwang, Conly L. Hansen, D.k. StevensAbstract:Abstract A laboratory study was performed to determine the kinetic model and to evaluate kinetic coefficients of continuous upflow anaerobic Sludge Blanket (UASB) reactors treating whey permeate. Eight hydraulic retention times (5·-0·4 day) were investigated at fixed influent substrate concentration (10·4 ± 0·2 g COD/litre). The maximum substrate utilization rate, k, and half saturation coefficient, K L , were determined to be 0·941 kg COD rmvd /kg VSS/day and 0·773 kg COD/kg VSS/day. The yield coefficient, Y, and Sludge decay rate coefficient, K d , were also determined to be 0·153 kg VSS/kg COD and 0·022/day, respectively.
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Performance of Upflow Anaerobic Sludge Blanket (UASB) Reactor Treating Whey Permeate
Transactions of the ASABE, 1992Co-Authors: Seokhwan Hwang, Conly L. HansenAbstract:Whey permeate was anaerobically digested in laboratory scale upflow anaerobic Sludge Blanket (UASB) reactors. Eight hydraulic retention times (HRT) between 0.4 and 5 days were examined with a fixed influent concentration of 10.4 ± 0.2 g COD/L.
