The Experts below are selected from a list of 35478 Experts worldwide ranked by ideXlab platform
Tao Wang - One of the best experts on this subject based on the ideXlab platform.
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the development of simultaneous partial nitrification anammox and denitrification snad process in a Single Reactor for nitrogen removal
Bioresource Technology, 2009Co-Authors: Huihui Chen, Fenglin Yang, Tao WangAbstract:Abstract The simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) process was validated to potentially remove ammonium and COD from wastewater in a Single, oxygen-limited, non-woven rotating biological contactor (NRBC) Reactor. An ammonium conversion efficiency of 79%, TN removal efficiency of 70% and COD removal efficiency of 94% were obtained with the nitrogen and COD loading rate of 0.69 kg N/m 3 d and 0.34 kg/m 3 d, respectively. Scanning electron microscopy (SEM) observation and fluorescence in situ hybridizations (FISH) analysis revealed the existence of the dominant groups of bacteria. As a result, the aerobic ammonia-oxidizing bacteria (AOB), with a spot of aerobic heterotrophic bacteria were mainly distributed in the aerobic outer part of the biofilm. However, ANAMMOX bacteria with denitrifying bacteria were present and active in the anaerobic inner part of the SNAD biofilm. These bacteria were found to exist in a dynamic equilibrium to achieve simultaneous nitrogen and COD removal in NRBC system.
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the development of simultaneous partial nitrification anammox and denitrification snad process in a Single Reactor for nitrogen removal
Bioresource Technology, 2009Co-Authors: Huihui Chen, Fenglin Yang, Sitong Liu, Yuan Xue, Tao WangAbstract:The simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) process was validated to potentially remove ammonium and COD from wastewater in a Single, oxygen-limited, non-woven rotating biological contactor (NRBC) Reactor. An ammonium conversion efficiency of 79%, TN removal efficiency of 70% and COD removal efficiency of 94% were obtained with the nitrogen and COD loading rate of 0.69 kgN/m(3)d and 0.34 kg/m(3)d, respectively. Scanning electron microscopy (SEM) observation and fluorescence in situ hybridizations (FISH) analysis revealed the existence of the dominant groups of bacteria. As a result, the aerobic ammonia-oxidizing bacteria (AOB), with a spot of aerobic heterotrophic bacteria were mainly distributed in the aerobic outer part of the biofilm. However, ANAMMOX bacteria with denitrifying bacteria were present and active in the anaerobic inner part of the SNAD biofilm. These bacteria were found to exist in a dynamic equilibrium to achieve simultaneous nitrogen and COD removal in NRBC system.
Fenglin Yang - One of the best experts on this subject based on the ideXlab platform.
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coupling anaerobic baffled Reactor and membrane aerated biofilm Reactor
Environmental Sciences, 2010Co-Authors: Chunyu Yang, Fenglin YangAbstract:Based on the consistent anaerobic status of outer layer of membrane-aerated biofilm Reactor (MABR) and internal anaerobic baffled Reactor (ABR), MABR and ABR were started up separately. The aerating membrane module was installed into a compartment of anaerobic baffled bioReactor to form the Hybrid MAB-ABR (HMABR). After the installation of membrane module, total COD and VFA concentrations in the HMABR effluent were deceased by 59.5% and 68.1% respectively, with increased nitrogenous pollutant remove efficiency by 83.5%, at influent COD concentration of 1600 mg/L and NH4+ -N concentration of 80 mg/L. When organic loading rate was increased by 50%, the effluent COD concentration was still below the level of 60 mg/L, indicating its good capability of counteracting influent organic loading fluctuation. Due to the decreased COD concentration and increased nitrate concentration in the third compartment after installing the membrane module, the biogas volume and methane contents in the third compartment were decreased, resulting in the steady and excellent effluent quality. In this hybrid process, the improved simultaneous removal of carbon and nitrogen for high-strength nitrogenous organic pollutants was realized in a Single Reactor.
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the development of simultaneous partial nitrification anammox and denitrification snad process in a Single Reactor for nitrogen removal
Bioresource Technology, 2009Co-Authors: Huihui Chen, Fenglin Yang, Tao WangAbstract:Abstract The simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) process was validated to potentially remove ammonium and COD from wastewater in a Single, oxygen-limited, non-woven rotating biological contactor (NRBC) Reactor. An ammonium conversion efficiency of 79%, TN removal efficiency of 70% and COD removal efficiency of 94% were obtained with the nitrogen and COD loading rate of 0.69 kg N/m 3 d and 0.34 kg/m 3 d, respectively. Scanning electron microscopy (SEM) observation and fluorescence in situ hybridizations (FISH) analysis revealed the existence of the dominant groups of bacteria. As a result, the aerobic ammonia-oxidizing bacteria (AOB), with a spot of aerobic heterotrophic bacteria were mainly distributed in the aerobic outer part of the biofilm. However, ANAMMOX bacteria with denitrifying bacteria were present and active in the anaerobic inner part of the SNAD biofilm. These bacteria were found to exist in a dynamic equilibrium to achieve simultaneous nitrogen and COD removal in NRBC system.
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the development of simultaneous partial nitrification anammox and denitrification snad process in a Single Reactor for nitrogen removal
Bioresource Technology, 2009Co-Authors: Huihui Chen, Fenglin Yang, Sitong Liu, Yuan Xue, Tao WangAbstract:The simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) process was validated to potentially remove ammonium and COD from wastewater in a Single, oxygen-limited, non-woven rotating biological contactor (NRBC) Reactor. An ammonium conversion efficiency of 79%, TN removal efficiency of 70% and COD removal efficiency of 94% were obtained with the nitrogen and COD loading rate of 0.69 kgN/m(3)d and 0.34 kg/m(3)d, respectively. Scanning electron microscopy (SEM) observation and fluorescence in situ hybridizations (FISH) analysis revealed the existence of the dominant groups of bacteria. As a result, the aerobic ammonia-oxidizing bacteria (AOB), with a spot of aerobic heterotrophic bacteria were mainly distributed in the aerobic outer part of the biofilm. However, ANAMMOX bacteria with denitrifying bacteria were present and active in the anaerobic inner part of the SNAD biofilm. These bacteria were found to exist in a dynamic equilibrium to achieve simultaneous nitrogen and COD removal in NRBC system.
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feasibility of a membrane aerated biofilm Reactor to achieve Single stage autotrophic nitrogen removal based on anammox
Chemosphere, 2007Co-Authors: Fenglin Yang, Zheng Gong, Shaowei Hu, Kenji FurukawaAbstract:Abstract A laboratory-scale membrane-aerated biofilm bioReactor (MABR) equipped with non-woven fabrics support around the gas-permeable carbon tube was developed for Single-stage autotrophic nitrogen removal based on partial nitrification and anaerobic ammonium oxidization. This Reactor allowed air to be supplied through the microporous carbon tube wall to the biofilm that was supported by non-woven fabrics. The partial nitrification and consumption of dissolved oxygen occurred in the inner layer and Anammox in the anoxic outer layer of the non-woven fabrics, thus realizing autotrophic nitrogen removal in a Single Reactor. After 116 d of operation, the maximal nitrogen removal of 0.77 kg N m −3 d −1 at a volumetric ammonium loading rate of 0.87 kg N m −3 d −1 was achieved. The spatial profiles of the ammonia-oxidizing bacteria and Anammox bacteria were evaluated by fluorescence in situ hybridization. This study demonstrated that MABR was a very suitable experimental set-up for the operation of the Single-stage autotrophic nitrogen removal process.
Huihui Chen - One of the best experts on this subject based on the ideXlab platform.
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the development of simultaneous partial nitrification anammox and denitrification snad process in a Single Reactor for nitrogen removal
Bioresource Technology, 2009Co-Authors: Huihui Chen, Fenglin Yang, Tao WangAbstract:Abstract The simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) process was validated to potentially remove ammonium and COD from wastewater in a Single, oxygen-limited, non-woven rotating biological contactor (NRBC) Reactor. An ammonium conversion efficiency of 79%, TN removal efficiency of 70% and COD removal efficiency of 94% were obtained with the nitrogen and COD loading rate of 0.69 kg N/m 3 d and 0.34 kg/m 3 d, respectively. Scanning electron microscopy (SEM) observation and fluorescence in situ hybridizations (FISH) analysis revealed the existence of the dominant groups of bacteria. As a result, the aerobic ammonia-oxidizing bacteria (AOB), with a spot of aerobic heterotrophic bacteria were mainly distributed in the aerobic outer part of the biofilm. However, ANAMMOX bacteria with denitrifying bacteria were present and active in the anaerobic inner part of the SNAD biofilm. These bacteria were found to exist in a dynamic equilibrium to achieve simultaneous nitrogen and COD removal in NRBC system.
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the development of simultaneous partial nitrification anammox and denitrification snad process in a Single Reactor for nitrogen removal
Bioresource Technology, 2009Co-Authors: Huihui Chen, Fenglin Yang, Sitong Liu, Yuan Xue, Tao WangAbstract:The simultaneous partial nitrification, ANAMMOX and denitrification (SNAD) process was validated to potentially remove ammonium and COD from wastewater in a Single, oxygen-limited, non-woven rotating biological contactor (NRBC) Reactor. An ammonium conversion efficiency of 79%, TN removal efficiency of 70% and COD removal efficiency of 94% were obtained with the nitrogen and COD loading rate of 0.69 kgN/m(3)d and 0.34 kg/m(3)d, respectively. Scanning electron microscopy (SEM) observation and fluorescence in situ hybridizations (FISH) analysis revealed the existence of the dominant groups of bacteria. As a result, the aerobic ammonia-oxidizing bacteria (AOB), with a spot of aerobic heterotrophic bacteria were mainly distributed in the aerobic outer part of the biofilm. However, ANAMMOX bacteria with denitrifying bacteria were present and active in the anaerobic inner part of the SNAD biofilm. These bacteria were found to exist in a dynamic equilibrium to achieve simultaneous nitrogen and COD removal in NRBC system.
M C M Van Loosdrecht - One of the best experts on this subject based on the ideXlab platform.
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simultaneous partial nitritation and anammox at low temperature with granular sludge
Water Research, 2014Co-Authors: Tommaso Lotti, Robbert Kleerebezem, Boran Kartal, Mike S M Jetten, M C M Van LoosdrechtAbstract:Abstract Autotrophic nitrogen removal in the main stream appears as a prerequisite for the implementation of energy autarchic wastewater treatment plants. To investigate autotrophic nitrogen removal a lab-scale gas-lift sequencing batch Reactor with granular sludge was operated for more than 500 days. The Reactor was operated at temperatures between 20 and 10 °C on autotrophic medium with ammonium (60 and 160 mg-N L −1 ) as only nitrogen compound at an HRT of 0.23–0.3 d. The dissolved oxygen (DO) concentration was shown to be an effective control parameter for the suppression of the undesired nitratation process. DO control guaranteed the effective suppression of the nitratation both at 20 and 15 °C, allowing nitrogen removal rates of 0.4 g-N Tot L −1 d −1 at nitrogen removal efficiencies of 85-75%. Prolonged operation at 10 °C caused a slow but unrestrainable decrease in anammox activity and process efficiency. This study represents a proof of concept for the application of the autotrophic nitrogen removal in a Single Reactor with granular sludge at main stream conditions.
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measuring biomass specific ammonium nitrite and phosphate uptake rates in aerobic granular sludge
Chemosphere, 2012Co-Authors: Joao Paulo Bassin, Robbert Kleerebezem, Marcia Dezotti, M C M Van LoosdrechtAbstract:Aerobic granular sludge (AGS) technology offers the possibility to remove organic carbon, nitrogen and phosphorus in a Single Reactor system. The granular structure is stratified in such a way that both aerobic and anaerobic/anoxic layers are present. Since most of the biological processes in AGS systems occur simultaneously, the measurement and estimation of the capacity of specific conversions is complicated compared to suspended biomass. The determination of the activities of different functional groups in aerobic granular sludge allows for identification of the potential metabolic capacity of the sludge and aids to analyze bioReactor performance. It allows for comparison of different sludges and enables improved understanding of the interaction and competition between different metabolic groups of microorganisms. The most appropriate experimental conditions and methods to determine specific ammonium, nitrite and phosphate uptake rates under normal operation of AGS Reactors were evaluated and described in this study. Extra biomass characterization experiments determining the maximum uptake rate of these compounds on optimized conditions were performed as well to see how much spare capacity was available. The methodologies proposed may serve as an experimental frame of reference for investigating the metabolic capacities of microbial functional groups in biofilm processes.
Zheng Gong - One of the best experts on this subject based on the ideXlab platform.
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feasibility of a membrane aerated biofilm Reactor to achieve Single stage autotrophic nitrogen removal based on anammox
Chemosphere, 2007Co-Authors: Fenglin Yang, Zheng Gong, Shaowei Hu, Kenji FurukawaAbstract:Abstract A laboratory-scale membrane-aerated biofilm bioReactor (MABR) equipped with non-woven fabrics support around the gas-permeable carbon tube was developed for Single-stage autotrophic nitrogen removal based on partial nitrification and anaerobic ammonium oxidization. This Reactor allowed air to be supplied through the microporous carbon tube wall to the biofilm that was supported by non-woven fabrics. The partial nitrification and consumption of dissolved oxygen occurred in the inner layer and Anammox in the anoxic outer layer of the non-woven fabrics, thus realizing autotrophic nitrogen removal in a Single Reactor. After 116 d of operation, the maximal nitrogen removal of 0.77 kg N m −3 d −1 at a volumetric ammonium loading rate of 0.87 kg N m −3 d −1 was achieved. The spatial profiles of the ammonia-oxidizing bacteria and Anammox bacteria were evaluated by fluorescence in situ hybridization. This study demonstrated that MABR was a very suitable experimental set-up for the operation of the Single-stage autotrophic nitrogen removal process.
