The Experts below are selected from a list of 101232 Experts worldwide ranked by ideXlab platform
Kun Zhang - One of the best experts on this subject based on the ideXlab platform.
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nitrogen removal augmentation of ship sewage by an innovative aerobic anaerobic micro sludge mbr technology
Process Biochemistry, 2019Co-Authors: Yuhang Cai, Teng Ben, Asad A Zaidi, Yue Shi, Kun ZhangAbstract:Abstract The implementation of latest International Maritime Organization (IMO) Emission Standard has raised stringent nitrogen requirements for marine domestic sewage discharge. In order to meet new discharge Standards, novel aerobic-anaerobic micro-sludge membrane bioreactor (O-AMSMBR) for chemical oxygen demand (COD) and total nitrogen (TN) removal from ship sewage is proposed. Results indicated that novel MBR achieved better COD and TN removal efficiency (Ravg(COD) = 91.6% and Ravg(TN) = 88.07%). The amount of anaerobic sludge in O-AMSMBR was reduced by 80% however TN removal rate was 10% higher than traditional Membrane Bio-Reactors (MBRs) technology. Based on the analysis of sludge characteristics, high TN removal efficiency is achieved via collective role of simultaneous nitrification and denitrification (SND) and “anaerobic micro-sludge effect”. Microbial community analysis also revealed that Rhodobacter and Pseudomonas are dominant species in anaerobic zone, which has a direct relationship with “anaerobic micro-sludge effect”. Further, transmembrane Pressure (TMP) showed that “anaerobic micro-sludge effect” not only has a positive effect on pollutants removal but also can suspend membrane fouling. The outcomes of this study suggest that post-anaerobic integrated with micro-sludge methods played a vital role in keeping good pollutant degradation in ship wastewater treatment. The presented results can provide new insights into ship sewage treatment by MBR technology.
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effect of ph on pollutants removal of ship sewage treatment in an innovative aerobic anaerobic micro sludge mbr system
Water Air and Soil Pollution, 2019Co-Authors: Yuhang Cai, Teng Ben, Asad A Zaidi, Yue Shi, Kun Zhang, Aqiang Lin, Chen LiuAbstract:The implementation of the latest International Maritime Organization (IMO) Emission Standard has raised stringent requirements for marine domestic sewage discharge. In this study, a novel aerobic-anaerobic micro-sludge membrane bioreactor (O-AMSMBR) was used to analyze the effect of pH variation on the effluent chemical oxygen demand (COD) and total nitrogen (TN) for marine domestic sewage. Results showed that the novel MBR achieved better COD and TN removal efficiency (Ravg(COD) = 87.77% and Ravg(TN) = 91.01%). In acid environment (pH = 5), anaerobic micro-sludge MBR technology can enhance the pollutants removal efficiency under pH shock. These two findings indicated that anaerobic micro-sludge membrane bioreactor (MBR) technology has great potential in acidity or alkalinity wastewater treatment. The activity of six different enzymes was analyzed in this study. The results showed that nitrate reductase and nitrite reductase can serve as special indicating factors for anaerobic micro-sludge MBR technology on domestic ship sewage. Moreover, wavelet neural network (WNN) and back-propagation neural network (BPNN) were used to simulate the effect of pH on reactor performance. The order of relative importance inculcated that pH is the key factor to consider for biodegradation of organic matter in O-AMSMBR system. The outcomes of this study suggest that post-anaerobic integrated with micro-sludge methods can play a vital role in keeping good pollutant degradation in ship wastewater treatment under pH shift.
Jiping Chen - One of the best experts on this subject based on the ideXlab platform.
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stack gas Emissions of pcdd fs from hospital waste incinerators in china
Chemosphere, 2009Co-Authors: Hongcai Gao, Haijun Zhang, Liang Zhao, Ning Zhang, Xueping Zhang, Qing Zhang, Jiping ChenAbstract:Stack gas samples from 14 domestic-made hospital waste incinerators (HWIs) in China were collected and analyzed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). The waste burning capacities of the investigated HWIs ranged from 5 to 25 ton d(-1). The stack gas Emissions of PCDD/Fs from HWIs exhibited a large variation (0.08-31.60 ng I-TEQNm(-3)). Nine incinerators had the Emission levels below the current Emission Standard in China (0.5 ng I-TEQN m(-3)), while only two facilities exhibited Emission levels below the European Union directive Emission limit (0.1 ng I-TEQN m(-3)). For two plants, concentrations of PCDD/Fs in stack gas were above 10.0 ng I-TEQN m(-3). The Emission factors of PCDD/Fs from the investigated HWIs were in the range of 0.78-473.97 microg I-TEQ ton(-1) medical wastes. It was estimated that 4.87 g I-TEQ of PCDD/Fs was annually released from HWIs to the atmosphere in China in 2006. Principal component analysis and hierarchical cluster analysis were applied to analyze the congener profiles of PCDD/Fs from HWIs in China.
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stack gas Emissions of pcdd fs from hospital waste incinerators in china
Chemosphere, 2009Co-Authors: Hongcai Gao, Haijun Zhang, Liang Zhao, Ning Zhang, Xueping Zhang, Qing Zhang, Jiping ChenAbstract:Stack gas samples from 14 domestic-made hospital waste incinerators (HWIs) in China were collected and analyzed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). The waste burning capacities of the investigated HWIs ranged from 5 to 25 ton d(-1). The stack gas Emissions of PCDD/Fs from HWIs exhibited a large variation (0.08-31.60 ng I-TEQN m(-3)). Nine incinerators had the Emission levels below the current Emission Standard in China (0.5 ng I-TEQN m(-3)), while only two facilities exhibited Emission levels below the European Union directive Emission limit (0.1 ng I-TEQ N m(-3)). For two plants, concentrations of PCDD/Fs in stack gas were above 10.0 ng I-TEQ N m-3. The Emission factors of PCDD/Fs from the investigated HWIs were in the range of 0.78-473.97 mu g I-TE ton(-1) medical wastes. It was estimated that 4.87 g I-TEQ of PCDD/Fs was annually released from HWIs to the atmosphere in China in 2006. Principal component analysis and hierarchical cluster analysis were applied to analyze the congener profiles of PCDD/Fs from HWIs in China. (C) 2009 Elsevier Ltd. All rights reserved.
Yuhang Cai - One of the best experts on this subject based on the ideXlab platform.
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nitrogen removal augmentation of ship sewage by an innovative aerobic anaerobic micro sludge mbr technology
Process Biochemistry, 2019Co-Authors: Yuhang Cai, Teng Ben, Asad A Zaidi, Yue Shi, Kun ZhangAbstract:Abstract The implementation of latest International Maritime Organization (IMO) Emission Standard has raised stringent nitrogen requirements for marine domestic sewage discharge. In order to meet new discharge Standards, novel aerobic-anaerobic micro-sludge membrane bioreactor (O-AMSMBR) for chemical oxygen demand (COD) and total nitrogen (TN) removal from ship sewage is proposed. Results indicated that novel MBR achieved better COD and TN removal efficiency (Ravg(COD) = 91.6% and Ravg(TN) = 88.07%). The amount of anaerobic sludge in O-AMSMBR was reduced by 80% however TN removal rate was 10% higher than traditional Membrane Bio-Reactors (MBRs) technology. Based on the analysis of sludge characteristics, high TN removal efficiency is achieved via collective role of simultaneous nitrification and denitrification (SND) and “anaerobic micro-sludge effect”. Microbial community analysis also revealed that Rhodobacter and Pseudomonas are dominant species in anaerobic zone, which has a direct relationship with “anaerobic micro-sludge effect”. Further, transmembrane Pressure (TMP) showed that “anaerobic micro-sludge effect” not only has a positive effect on pollutants removal but also can suspend membrane fouling. The outcomes of this study suggest that post-anaerobic integrated with micro-sludge methods played a vital role in keeping good pollutant degradation in ship wastewater treatment. The presented results can provide new insights into ship sewage treatment by MBR technology.
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effect of ph on pollutants removal of ship sewage treatment in an innovative aerobic anaerobic micro sludge mbr system
Water Air and Soil Pollution, 2019Co-Authors: Yuhang Cai, Teng Ben, Asad A Zaidi, Yue Shi, Kun Zhang, Aqiang Lin, Chen LiuAbstract:The implementation of the latest International Maritime Organization (IMO) Emission Standard has raised stringent requirements for marine domestic sewage discharge. In this study, a novel aerobic-anaerobic micro-sludge membrane bioreactor (O-AMSMBR) was used to analyze the effect of pH variation on the effluent chemical oxygen demand (COD) and total nitrogen (TN) for marine domestic sewage. Results showed that the novel MBR achieved better COD and TN removal efficiency (Ravg(COD) = 87.77% and Ravg(TN) = 91.01%). In acid environment (pH = 5), anaerobic micro-sludge MBR technology can enhance the pollutants removal efficiency under pH shock. These two findings indicated that anaerobic micro-sludge membrane bioreactor (MBR) technology has great potential in acidity or alkalinity wastewater treatment. The activity of six different enzymes was analyzed in this study. The results showed that nitrate reductase and nitrite reductase can serve as special indicating factors for anaerobic micro-sludge MBR technology on domestic ship sewage. Moreover, wavelet neural network (WNN) and back-propagation neural network (BPNN) were used to simulate the effect of pH on reactor performance. The order of relative importance inculcated that pH is the key factor to consider for biodegradation of organic matter in O-AMSMBR system. The outcomes of this study suggest that post-anaerobic integrated with micro-sludge methods can play a vital role in keeping good pollutant degradation in ship wastewater treatment under pH shift.
Hongcai Gao - One of the best experts on this subject based on the ideXlab platform.
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stack gas Emissions of pcdd fs from hospital waste incinerators in china
Chemosphere, 2009Co-Authors: Hongcai Gao, Haijun Zhang, Liang Zhao, Ning Zhang, Xueping Zhang, Qing Zhang, Jiping ChenAbstract:Stack gas samples from 14 domestic-made hospital waste incinerators (HWIs) in China were collected and analyzed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). The waste burning capacities of the investigated HWIs ranged from 5 to 25 ton d(-1). The stack gas Emissions of PCDD/Fs from HWIs exhibited a large variation (0.08-31.60 ng I-TEQNm(-3)). Nine incinerators had the Emission levels below the current Emission Standard in China (0.5 ng I-TEQN m(-3)), while only two facilities exhibited Emission levels below the European Union directive Emission limit (0.1 ng I-TEQN m(-3)). For two plants, concentrations of PCDD/Fs in stack gas were above 10.0 ng I-TEQN m(-3). The Emission factors of PCDD/Fs from the investigated HWIs were in the range of 0.78-473.97 microg I-TEQ ton(-1) medical wastes. It was estimated that 4.87 g I-TEQ of PCDD/Fs was annually released from HWIs to the atmosphere in China in 2006. Principal component analysis and hierarchical cluster analysis were applied to analyze the congener profiles of PCDD/Fs from HWIs in China.
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stack gas Emissions of pcdd fs from hospital waste incinerators in china
Chemosphere, 2009Co-Authors: Hongcai Gao, Haijun Zhang, Liang Zhao, Ning Zhang, Xueping Zhang, Qing Zhang, Jiping ChenAbstract:Stack gas samples from 14 domestic-made hospital waste incinerators (HWIs) in China were collected and analyzed for polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). The waste burning capacities of the investigated HWIs ranged from 5 to 25 ton d(-1). The stack gas Emissions of PCDD/Fs from HWIs exhibited a large variation (0.08-31.60 ng I-TEQN m(-3)). Nine incinerators had the Emission levels below the current Emission Standard in China (0.5 ng I-TEQN m(-3)), while only two facilities exhibited Emission levels below the European Union directive Emission limit (0.1 ng I-TEQ N m(-3)). For two plants, concentrations of PCDD/Fs in stack gas were above 10.0 ng I-TEQ N m-3. The Emission factors of PCDD/Fs from the investigated HWIs were in the range of 0.78-473.97 mu g I-TE ton(-1) medical wastes. It was estimated that 4.87 g I-TEQ of PCDD/Fs was annually released from HWIs to the atmosphere in China in 2006. Principal component analysis and hierarchical cluster analysis were applied to analyze the congener profiles of PCDD/Fs from HWIs in China. (C) 2009 Elsevier Ltd. All rights reserved.
Xuelan Zeng - One of the best experts on this subject based on the ideXlab platform.
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reduction measures for air pollutants and greenhouse gas in the transportation sector a cost benefit analysis
Journal of Cleaner Production, 2019Co-Authors: Yonghong Liu, Wenyuan Liao, Yuting Huang, Xuelan ZengAbstract:Abstract Cost-benefit analysis of Emission control measures is an important part of the development and refinement of policies in the transportation sector, especially in China. In this paper, a cost-benefit analysis of the measures in place to reduce air pollutants [carbon monoxide (CO), volatile organic compounds (VOCs), nitrogen oxides (NOX), fine particulate matter (PM2.5)] and greenhouse gases (GHGs) [carbon dioxide (CO2)] in the Pearl River Delta (PRD) region by 2020 is conducted. Based on the design of five types of Emission reduction scenarios and normalization of the Emission reduction effect, the total costs and the cost-benefit of these reduction scenarios in the PRD region by 2020 are evaluated. Results show the scenario, which new cars bought after 2014 are all upgraded from China V Emission Standard to China VI Emission Standard and motorcycles are still China III Emission Standard (UES), has a significant effect with 717,690 tons of the air pollutants equivalent and 38,960 tons of the GHGs equivalent reduction, while the Eliminate Motorcycles (EM) scenario produces the worst Emissions reduction result. Therefore the cost-benefit of the UES scenario is extremely high, and the unit cost of air pollutants and GHGs reductions is only 0.003 Renminbi/g (RMB/g), showing a win-win situation of Emission reduction and cost savings. Although the total cost of the BPSevere scenario, giving priority to public transportation development to reduce the mobility for private cars and motorcycles, is the highest (197.47 billion RMB), it can effectively reduce 9925 tons of GHGs equivalent and bring significant climate benefits. Moreover, for any reduction scenarios, the cost-benefit cannot be improved by strengthening the control level. And the comparison of the unit reduction costs among four different sectors shows that the cost-benefits of reduction scenarios in the transportation sector are worse and more variable.
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assessment of co benefits of vehicle Emission reduction measures for 2015 2020 in the pearl river delta region china
Environmental Pollution, 2017Co-Authors: Wenyuan Liao, Li Li, Xuelan ZengAbstract:Abstract Vehicle Emissions have become one of the key factors affecting the urban air quality and climate change in the Pearl River Delta (PRD) region, so it is important to design policies of Emission reduction based on quantitative Co-benefits for air pollutants and greenhouse gas (GHG). Emissions of air pollutants and GHG by 2020 was predicted firstly based on the no-control scenario, and five vehicle Emissions reduction scenarios were designed in view of the economy, technology and policy, whose Emissions reduction were calculated. Then Co-benefits between air pollutants and GHG were quantitatively analyzed by the methods of coordinate system and cross-elasticity. Results show that the Emissions reduction effects and the Co-benefits of different measures vary greatly in 2015–2020. If no control scheme was applied, most air pollutants and GHG would increase substantially by 20–64% by 2020, with the exception of CO, VOC and PM 2.5 . Different control measures had different reduction effects for single air pollutant and GHG. The worst reduction measure was Eliminating Motorcycles with average reducing rate 0.09% for air pollutants and GHG, while the rate from Updated Emission Standard was 41.74%. Eliminating Yellow-label Vehicle scenario had an obvious reduction effect for every single pollutant in the earlier years, but Co-benefits would descent to zero in later by 2020. From the perspective of Emission reductions and co-control effect, Updated Emission Standard scenario was best for reducing air pollutants and GHG substantially ( tan α = 1.43 and E l s = 1 . 77 ).