The Experts below are selected from a list of 22419 Experts worldwide ranked by ideXlab platform
Yang Guo - One of the best experts on this subject based on the ideXlab platform.
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Effect of Oxidation Coefficient on Products of Sewage Sludge Treatment in Supercritical Water
Energy Procedia, 2017Co-Authors: Guike Lin, Zhijiang Ma, Donghai Xu, Shuzhong Wang, Yang GuoAbstract:Supercritical water Treatment is a promising technology for Sewage Sludge disposal. The influences of oxidation coefficient (OC) as well as temperature on products of Sewage Sludge Treatment in supercritical water were studied systematically. The results show that CO2yield obviously increased with raising OC or temperature. Oxidant helped to convert N-containing compounds into N2. A small amount of oxidant increased H2yield but excess oxidant decreased it. OC had significant effect on the COD (chemical oxygen demand) and NH3-N (ammonia nitrogen) concentration of liquid products. Most of organic compounds disappeared at OC=1.0 as temperature changed from 450 to 500, and diethyl phthalate was main stubborn substance in the liquid phase. The contents of some elements (such as Si, Al and Ca) in solid residue was almost double compared with those in dry basis SS.
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Influence of oxidation coefficient on product properties in Sewage Sludge Treatment by supercritical water
International Journal of Hydrogen Energy, 2013Co-Authors: Shuzhong Wang, Yang Guo, Xingying Tang, Yanmeng Gong, Jie Zhang, Yuzhen Wang, Lu ZhouAbstract:Abstract Oxidation coefficient plays a significant role in Sewage Sludge Treatment in supercritical water, such as supercritical water oxidation (SCWO) and supercritical water partial oxidation (SWPO). In this work, the influences of oxidation coefficient (n) on Sewage Sludge Treatment in supercritical water are investigated systematically and the corresponding reaction mechanisms are discussed objectively. Moreover, corrosion properties of stainless steel 316 considered as reactor material are also explored. The results show that H2 yield first rises and then decreases with an increase in n. Its maximum value is approximately 190.4 ml/L when Sewage Sludge is disposed at 450 °C, 25 MPa, n = 0.6 and a residence time of 2.5 min. Under the reaction conditions of 540 °C, 25 MPa, n = 2.0 and 2.5 min, liquid product COD (Chemical Oxygen Demand) removal ratio, TOC (Total Organic Carbon) removal ratio and ammonia removal ratio of liquid product can reach up to 99.95%, 99.8% and 99.7%, respectively. However, if coupling SWPO and SCWO, we can obtain a certain amount of H2 and CH4, achieve the above removal ratios even at 450 °C and a lower total n (0.74), and meanwhile liquid products can meet corresponding discharge standards. However, special attention should be paid to reactor material corrosion in the above SWPO. We also confirm that stainless steel 316 undergoes more severe pitting corrosion in the absence of oxygen, compared with general corrosion in the excessive oxygen environment.
Shuzhong Wang - One of the best experts on this subject based on the ideXlab platform.
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Effect of Oxidation Coefficient on Products of Sewage Sludge Treatment in Supercritical Water
Energy Procedia, 2017Co-Authors: Guike Lin, Zhijiang Ma, Donghai Xu, Shuzhong Wang, Yang GuoAbstract:Supercritical water Treatment is a promising technology for Sewage Sludge disposal. The influences of oxidation coefficient (OC) as well as temperature on products of Sewage Sludge Treatment in supercritical water were studied systematically. The results show that CO2yield obviously increased with raising OC or temperature. Oxidant helped to convert N-containing compounds into N2. A small amount of oxidant increased H2yield but excess oxidant decreased it. OC had significant effect on the COD (chemical oxygen demand) and NH3-N (ammonia nitrogen) concentration of liquid products. Most of organic compounds disappeared at OC=1.0 as temperature changed from 450 to 500, and diethyl phthalate was main stubborn substance in the liquid phase. The contents of some elements (such as Si, Al and Ca) in solid residue was almost double compared with those in dry basis SS.
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Influence of oxidation coefficient on product properties in Sewage Sludge Treatment by supercritical water
International Journal of Hydrogen Energy, 2013Co-Authors: Shuzhong Wang, Yang Guo, Xingying Tang, Yanmeng Gong, Jie Zhang, Yuzhen Wang, Lu ZhouAbstract:Abstract Oxidation coefficient plays a significant role in Sewage Sludge Treatment in supercritical water, such as supercritical water oxidation (SCWO) and supercritical water partial oxidation (SWPO). In this work, the influences of oxidation coefficient (n) on Sewage Sludge Treatment in supercritical water are investigated systematically and the corresponding reaction mechanisms are discussed objectively. Moreover, corrosion properties of stainless steel 316 considered as reactor material are also explored. The results show that H2 yield first rises and then decreases with an increase in n. Its maximum value is approximately 190.4 ml/L when Sewage Sludge is disposed at 450 °C, 25 MPa, n = 0.6 and a residence time of 2.5 min. Under the reaction conditions of 540 °C, 25 MPa, n = 2.0 and 2.5 min, liquid product COD (Chemical Oxygen Demand) removal ratio, TOC (Total Organic Carbon) removal ratio and ammonia removal ratio of liquid product can reach up to 99.95%, 99.8% and 99.7%, respectively. However, if coupling SWPO and SCWO, we can obtain a certain amount of H2 and CH4, achieve the above removal ratios even at 450 °C and a lower total n (0.74), and meanwhile liquid products can meet corresponding discharge standards. However, special attention should be paid to reactor material corrosion in the above SWPO. We also confirm that stainless steel 316 undergoes more severe pitting corrosion in the absence of oxygen, compared with general corrosion in the excessive oxygen environment.
Francesc Hernández-sancho - One of the best experts on this subject based on the ideXlab platform.
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Selecting Sewage Sludge Treatment alternatives in modern wastewater Treatment plants using environmental decision support systems
Journal of Cleaner Production, 2015Co-Authors: Manel Garrido-baserba, M. Molinos-senante, J. M. Abelleira-pereira, L. A. Fdez-güelfo, Manel Poch, Francesc Hernández-sanchoAbstract:The importance of the Sewage Sludge Treatment within the field of wastewater Treatment plants (WWTPs) suggests new dimensions of analysis where the relevance of economic criteria combined with the associated environmental issues are increasing the Sludge management complexity. For supporting the decision process and for comparative purposes, this study assesses five alternative configurations for Sludge Treatment, namely: mesophilic and termophilic anaerobic digestion plus composting, incineration, gasification, and supercritical water oxidation (SCWO). The global warming potential (GWP) and the annual cash flow of each alternative are used to estimate a composite indicator for each alternative. Stakeholders' preferences are integrated into the assessment through the development of five scenarios prioritizing economic or environmental aspects. A case study for a 1 million person equivalent WWTP proved that SCWO is the most adequate option if economic and environmental criteria are considered equally important. However, if the economic assessment is prioritized over the environmental one, thermophilic anaerobic digestion followed by composting turned out to be the most appropriate option. The proposed approach contributes to the implementation of more suitable Sewage Sludge Treatment lines since it provides an indicator for each alternative embracing economic and GWP issues.
Marilys Pradel - One of the best experts on this subject based on the ideXlab platform.
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Survey data of Sewage Sludge Treatment and disposal routes originated from activated Sludge water Treatment in France
Data in Brief, 2019Co-Authors: Marilys PradelAbstract:This paper presents data collected from a survey on Sewage Sludge Treatment and disposal routes originated from activated Sludge water Treatment in France. The data of 3,679 wastewater Treatment plants - representing 52% of WWTP using activated Sludge and 69% of Sludge disposed by these WWTP - were collected from several French organisms such as SATESE (technical support for wastewater Treatment plants), water supply agencies, internal service of agricultural Chambers and public administrations in 71 French departments. The survey allows a detailed description of the processes used for Sewage Sludge Treatment (i.e. thickening, dewatering, stabilization, drying) as well as the type of disposal routes (i.e. land application, incineration, landfill.) and the related amount of Sewage Sludge disposed in dry matter tons. The data are provided in a raw and analyzed form within the Excel file provided with this article.
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in quest of environmental hotspots of Sewage Sludge Treatment combining anaerobic digestion and mechanical dewatering a life cycle assessment approach
Journal of Cleaner Production, 2017Co-Authors: Claire Gourde, R Giraul, Sarah Erthaul, Mario Richard, Julia Tosoni, Marilys PradelAbstract:Life cycle assessment was used to assess environmental impacts and a sensitivity analysis of 17 key technological parameters to identify the main environmental hotspots associated with the performance of a Sewage Sludge Treatment. The scenario takes into account primary and secondary Sludge and includes gravity and centrifugal thickening, anaerobic digestion with cogeneration of heat and electricity from biogas, mechanical dewatering and spreading on agricultural fields. All the relevant inputs (electricity, heat, reagents, infrastructure, fuel, transport) and outputs (emissions to air, water and soil) are accounted for in the assessment, including the Sludge return liquors from thickening and dewatering processes. This study focuses on climate change, terrestrial acidification, freshwater eutrophication, human toxicity and ionizing radiation impact categories assessed using the ReCiPe E v1.08/Europe baseline method. The results showed that the most sensitive parameters are the biodegradation rate of volatile solids and the nitrogen mineralization rate during anaerobic digestion, phosphorus and nitrogen capture rates during the thickening and dewatering processes, and the consumption of FeCl3 for the Treatment of Sludge before dewatering. The results suggest that the environmental performances of the Sewage Sludge Treatment line could be enhanced by increasing the production of biogas (by increasing the biodegradation rate of volatile solids), by decreasing the consumption of FeCl3 used for Sludge Treatment, and by finding alternative Treatments for Sludge return liquors.
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GESTABoues, a decision tool to assess greenhouse gases of Sewage Sludge Treatment and disposal routes
2012Co-Authors: A.l. Reverdy, Marilys PradelAbstract:Sewage Sludge production increases continuously reaching almost 20% (946 700 tons of dry matters in 2003 to 1 118 795 tons of dry matters in 2007) during the last decade. In 2007, 70% of the produced Sewage Sludge was spread (directly or after composting). The remaining 30% was incinerated (with or without household wastes) or landfilled. Nowadays, Sludge reduction is a major concern. This activity has to become more sustainable and stakeholders have to be careful to the environmental impacts of Sludge Treatment and disposal routes. To help stakeholders in that way, we developed a decision tool called GESTABoues. GESTABoues is a tool based on the "Bilan Carbone®" method (ADEME 2009). It was developed for stakeholders dealing with wastewater Treatment plants (plant manager, public administration…) to quantify greenhouse gases (GHG) for each type of emissions and each process of Sludge Treatment and disposal routes. The tool was developed with VisualBasic programming language. This tool can be used in a four step procedure: (i) The user built as many wastewater Treatment plants (WWTP) he wants. He should specify the WWTP capacity, the type of Sewage network and the water Treatment system. (ii) Then the user creates all the Sewage Sludge Treatment processes used for each WWTP. He has to choose different parameters for each step of Sludge Treatment and disposal. The user has the opportunity to choose either its own data or data collected through a literature review and implemented as "default value" in the tool. (iii) Once each WWTP and the Treatment and disposal routes of each WWTP created, the user can choose different graphic presentations to assess the impact of greenhouse gases emissions (Figure 1). GESTABoues calculate all emissions (direct and indirect) of carbon dioxide, methane and nitrous oxide for all steps of Sewage Sludge Treatment (storage, thickening, anaerobic digestion, aerobic digestion, dewatering, alkaline stabilization, composting, drying) and Sludge disposal route (land application, incineration, incineration with household wastes, landfilling). Emissions from infrastructures and transports are also considered. These graphs present emissions for each step (thickening, dewatering, land spreading…), each gas (dioxide carbon, methane and nitrous oxide) and each origin of greenhouse gases (combustible, electricity, direct emissions, avoided emissions, infrastructure, chemicals and transport). The graphs can be presented either as values or percentages. (iv) Finally, the user can compare different Sewage Sludge Treatment processes and disposal routes options and create reports with Microsoft Word through an export button. Each report summarizes the mass and energy balance as well as the selected graphs to be exported. In this study, this tool is used to compare 3 systems on a same WWTP to help stakeholders to identify which processes have the worst environmental impact all along the Treatment and disposal route, which emission is overwhelming and to help them selected the most interesting system from an environmental point of view.
Lu Zhou - One of the best experts on this subject based on the ideXlab platform.
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Influence of oxidation coefficient on product properties in Sewage Sludge Treatment by supercritical water
International Journal of Hydrogen Energy, 2013Co-Authors: Shuzhong Wang, Yang Guo, Xingying Tang, Yanmeng Gong, Jie Zhang, Yuzhen Wang, Lu ZhouAbstract:Abstract Oxidation coefficient plays a significant role in Sewage Sludge Treatment in supercritical water, such as supercritical water oxidation (SCWO) and supercritical water partial oxidation (SWPO). In this work, the influences of oxidation coefficient (n) on Sewage Sludge Treatment in supercritical water are investigated systematically and the corresponding reaction mechanisms are discussed objectively. Moreover, corrosion properties of stainless steel 316 considered as reactor material are also explored. The results show that H2 yield first rises and then decreases with an increase in n. Its maximum value is approximately 190.4 ml/L when Sewage Sludge is disposed at 450 °C, 25 MPa, n = 0.6 and a residence time of 2.5 min. Under the reaction conditions of 540 °C, 25 MPa, n = 2.0 and 2.5 min, liquid product COD (Chemical Oxygen Demand) removal ratio, TOC (Total Organic Carbon) removal ratio and ammonia removal ratio of liquid product can reach up to 99.95%, 99.8% and 99.7%, respectively. However, if coupling SWPO and SCWO, we can obtain a certain amount of H2 and CH4, achieve the above removal ratios even at 450 °C and a lower total n (0.74), and meanwhile liquid products can meet corresponding discharge standards. However, special attention should be paid to reactor material corrosion in the above SWPO. We also confirm that stainless steel 316 undergoes more severe pitting corrosion in the absence of oxygen, compared with general corrosion in the excessive oxygen environment.