The Experts below are selected from a list of 33354 Experts worldwide ranked by ideXlab platform
Ke Yin - One of the best experts on this subject based on the ideXlab platform.
-
environmental perspectives of recycling various combustion ashes in cement production a review
Waste Management, 2018Co-Authors: Ke Yin, Ashiq Ahamed, Grzegorz LisakAbstract:Abstract Recycling different types of ashes for cement production has gained increasing attentions worldwide in a bid to close the waste loop. It minimizes waste landfilling and meanwhile produces useful secondary materials with reduced costs. Ascribed to the presence of elevated metal concentrations, however, it also receives negative inclination for their reuse. Herein, recycling various combustion ashes, such as municipal solid waste incineration fly ashes (MSWI FA), municipal solid waste incineration bottom ashes (MSWI BA), coal fly ashes (CFA), coal bottom ashes (CBA), blast furnace slags (BFS), biomass ashes (BIOA), sewage sludge ashes (SSA) and different co-combustion ashes (CCA), were comprehensively reviewed, from environmental perspectives combined with statistical data analysis (e.g. bulk components, trace metals, Leaching Potential, and etc.), to quantitatively explore their feasibility during cement production. It was unveiled that pozzolanic contents were predominant which highly fluctuated in their composition based on the ash type, limiting the replacement at maximum of 5–10 wt%. Considering total metal criteria, heavy metal contents posed challenges as secondary raw materials for blended cements. However, in consideration of metal Leaching criteria, exothermic pozzolanic reactions in the second phase of blended cement would sufficiently alleviate their Leaching Potential, ensuring the environmental feasibility. Apart from the above, treatment costs have to be evaluated in nexus of multiple factors, whereas government policies play significant roles in valorization of recycling ashes. From sustainability perspective, life cycle assessment promises the overall strategy on ash utilization in cement industry.
-
statistical comparison of Leaching behavior of incineration bottom ash using seawater and deionized water significant findings based on several Leaching methods
Journal of Hazardous Materials, 2018Co-Authors: Ke Yin, Wei Ping Chan, Xiaomin Dou, Fei Ren, Victor W C ChangAbstract:Bottom ashes generated from municipal solid waste incineration have gained increasing popularity as alternative construction materials, however, they contains elevated heavy metals posing a challenge for its free usage. Different Leaching methods are developed to quantify Leaching Potential of incineration bottom ashes meanwhile guide its environmentally friendly application. Yet, there are diverse IBA applications while the in situ environment is always complicated, challenging its legislation. In this study, Leaching tests were conveyed using batch and column Leaching methods with seawater as opposed to deionized water, to unveil the metal Leaching Potential of IBA subjected to salty environment, which is commonly encountered when using IBA in land reclamation yet not well understood. Statistical analysis for different Leaching methods suggested disparate performance between seawater and deionized water primarily ascribed to ionic strength. Impacts of leachant are metal-specific dependent on Leaching methods and have a function of intrinsic characteristics of incineration bottom ashes. Leaching performances were further compared on additional perspectives, e.g. Leaching approach and liquid to solid ratio, indicating sophisticated Leaching Potentials dominated by combined geochemistry. It is necessary to develop application-oriented Leaching methods with corresponding Leaching criteria to preclude discriminations between different applications, e.g., terrestrial applications vs. land reclamation.
-
Environmental perspectives of recycling various combustion ashes in cement production – a review
'Elsevier BV', 2018Co-Authors: Ke Yin, Ahamed Ashiq, Lisak GrzegorzAbstract:Recycling different types of ashes for cement production has gained increasing attentions worldwide in a bid to close the waste loop. It minimizes waste landfilling and meanwhile produces useful secondary materials with reduced costs. Ascribed to the presence of elevated metal concentrations, however, it also receives negative inclination for their reuse. Herein, recycling various combustion ashes, such as municipal solid waste incineration fly ashes (MSWI FA), municipal solid waste incineration bottom ashes (MSWI BA), coal fly ashes (CFA), coal bottom ashes (CBA), blast furnace slags (BFS), biomass ashes (BIOA), sewage sludge ashes (SSA) and different co-combustion ashes (CCA), were comprehensively reviewed, from environmental perspectives combined with statistical data analysis (e.g. bulk components, trace metals, Leaching Potential, and etc.), to quantitatively explore their feasibility during cement production. It was unveiled that pozzolanic contents were predominant which highly fluctuated in their composition based on the ash type, limiting the replacement at maximum of 5–10 wt%. Considering total metal criteria, heavy metal contents posed challenges as secondary raw materials for blended cements. However, in consideration of metal Leaching criteria, exothermic pozzolanic reactions in the second phase of blended cement would sufficiently alleviate their Leaching Potential, ensuring the environmental feasibility. Apart from the above, treatment costs have to be evaluated in nexus of multiple factors, whereas government policies play significant roles in valorization of recycling ashes. From sustainability perspective, life cycle assessment promises the overall strategy on ash utilization in cement industry.Accepted versio
L Caceresjensen - One of the best experts on this subject based on the ideXlab platform.
-
nicosulfuron sorption kinetics and sorption desorption on volcanic ash derived soils proposal of sorption and transport mechanisms
Journal of Hazardous Materials, 2020Co-Authors: L Caceresjensen, Mauricio Escudey, Jorge Rodriguezbecerra, Jorge Joonagata, Cristian A Villagra, Valentina Dominguezvera, Angelo Neiraalbornoz, Maribel CornejohuentemillaAbstract:Abstract Nicosulfuron sorption/desorption kinetics were studied through batch sorption studies in ten volcanic ash-derived Andisol and Ultisol soils with acidic pH and variable surface charge. Two different kinetic models were used to fit the experimental data: i) Models to establish kinetic parameters (Pseudo-First and Pseudo-Second-Order), and ii) Models to describe solute transport mechanisms of organic compounds on sorbents (Intraparticle Diffusion, Dimensionless Intraparticle, Boyd, and Two-Site Nonequilibrium). Sorption kinetic data best fit the pseudo-second-order model. Application of these models to describe solute transport suggests that underlying mechanisms are complex in all soils due to: i) surface sorption, with mass transfers controlling sorption kinetics across the boundary layer; and ii) pore diffusion (i.e. intraparticle diffusion into macropores and micropores). The Freundlich model explained equilibrium sorption data in all cases (R2 > 0.9979) with Kf values higher than those reported for different class of soils (6.85–16.08 μg1-1/n mL1/n g-1). The hysteresis was significant in all studied soils. The lower sorption rate on Ultisols must be considered in regards to Nicosulfuron Leaching Potential.
-
sorption kinetics of diuron on volcanic ash derived soils
Journal of Hazardous Materials, 2013Co-Authors: L Caceresjensen, Mauricio Escudey, Jorge Rodriguezbecerra, Joselyn Parrarivero, Lorena Barrientos, Vicente CastrocastilloAbstract:Diuron sorption kinetic was studied in Andisols, Inceptisol and Ultisols soils in view of their distinctive physical and chemical properties: acidic pH and variable surface charge. Two types of kinetic models were used to fit the experimental dates: those that allow to establish principal kinetic parameters and modeling of sorption process (pseudo-first-order, pseudo-second-order), and some ones frequently used to describe solute transport mechanisms of organic compounds on different sorbents intended for remediation purposes (Elovich equation, intraparticle diffusion, Boyd, and two-site nonequilibrium models). The best fit was obtained with the pseudo-second-order model. The rate constant and the initial rate constant values obtained through this model demonstrated the behavior of Diuron in each soil, in Andisols were observed the highest values for both parameters. The application of the models to describe solute transport mechanisms allowed establishing that in all soils the mass transfer controls the sorption kinetic across the boundary layer and intraparticle diffusion into macropores and micropores. The slowest sorption rate was observed on Ultisols, behavior which must be taken into account when the Leaching Potential of Diuron is considered.
Grzegorz Lisak - One of the best experts on this subject based on the ideXlab platform.
-
environmental perspectives of recycling various combustion ashes in cement production a review
Waste Management, 2018Co-Authors: Ke Yin, Ashiq Ahamed, Grzegorz LisakAbstract:Abstract Recycling different types of ashes for cement production has gained increasing attentions worldwide in a bid to close the waste loop. It minimizes waste landfilling and meanwhile produces useful secondary materials with reduced costs. Ascribed to the presence of elevated metal concentrations, however, it also receives negative inclination for their reuse. Herein, recycling various combustion ashes, such as municipal solid waste incineration fly ashes (MSWI FA), municipal solid waste incineration bottom ashes (MSWI BA), coal fly ashes (CFA), coal bottom ashes (CBA), blast furnace slags (BFS), biomass ashes (BIOA), sewage sludge ashes (SSA) and different co-combustion ashes (CCA), were comprehensively reviewed, from environmental perspectives combined with statistical data analysis (e.g. bulk components, trace metals, Leaching Potential, and etc.), to quantitatively explore their feasibility during cement production. It was unveiled that pozzolanic contents were predominant which highly fluctuated in their composition based on the ash type, limiting the replacement at maximum of 5–10 wt%. Considering total metal criteria, heavy metal contents posed challenges as secondary raw materials for blended cements. However, in consideration of metal Leaching criteria, exothermic pozzolanic reactions in the second phase of blended cement would sufficiently alleviate their Leaching Potential, ensuring the environmental feasibility. Apart from the above, treatment costs have to be evaluated in nexus of multiple factors, whereas government policies play significant roles in valorization of recycling ashes. From sustainability perspective, life cycle assessment promises the overall strategy on ash utilization in cement industry.
Valdemar Luiz Tornisielo - One of the best experts on this subject based on the ideXlab platform.
-
Leaching of diuron hexazinone and sulfometuron methyl applied alone and in mixture in soils with contrasting textures
Journal of Agricultural and Food Chemistry, 2017Co-Authors: Fabricia Cristina Dos Reis, Rodrigo Floriano Pimpinato, Valdemar Luiz Tornisielo, Bianca A B Martins, Ricardo Victoria FilhoAbstract:When herbicides are applied in mixture, interactions among them could Potentially promote changes in herbicide behavior in the soil. Thus, application mode (isolated or in mixture) and soil texture (sandy or clayey) were investigated in the total Leaching of the commercial mixture diuron + hexazinone + sulfometuron-methyl, and of each isolated compound. Experiments in soil columns also evaluated the movement of each herbicide and mixtures across soil layers. In the sandy soil, the greatest total Leaching was observed with hexazinone compared to diuron and sulfometuron. Most of the applied diuron remained at the top layer of the soil, indicating that this herbicide has low soil mobility. Overall, our results show that hexazinone has greater Leaching Potential and mobility along the soil profile compared to diuron and sulfometuron. Our data can be used in assessing the fate of diuron, hexazinone, and sulfometuron alone or in mixture on natural ecosystems, under different soil types and application modes.
-
sorption of imazaquin in soils with positive balance of charges
Chemosphere, 2002Co-Authors: W S D Rocha, Jussara Borges Regitano, Luis Reynaldo Ferracciu Alleoni, Valdemar Luiz TornisieloAbstract:The herbicide imazaquin has both an acid and a basic ionizable groups, and its sorption depends upon the pH, the electric Potential (ψ0), and the oxide and the organic carbon (OC) contents of the soil. Sorption and extraction experiments using 14C-imazaquin were performed in surface and subsurface samples of two acric oxisols (an anionic “rhodic” acrudox and an anionic “xanthic” acrudox) and one non-acric alfisol (a rhodic kandiudalf), treated at four different pH values. Imazaquin showed low to moderate sorption to the soils. Sorption decreased and aqueous extraction increased as pH increased. Up to pH 5.8, sorption was higher in subsurface than in surface layers of the acric soils, due to the positive balance of charges resulted from the high Fe and Al oxide and the low OC contents. It favored electrostatic interactions with anionic molecules of imazaquin. For the subsurface samples of these highly weathered soils, where ψ0 was positive and OC was low, it was not possible to predict sorption just by considering imazaquin speciation and its hydrophobic partition to the organic domains of the soil. Moreover, if Koc measured for the surface samples were assumed to represent the whole profile in predictive models for Leaching Potential, then it would result in underestimation of sorption Potential in subsurface, and consequently result in overestimation of the Leaching Potential.
-
atributos de solos tropicais e a sorcao de imazaquin
Scientia Agricola, 2001Co-Authors: Jussara Borges Regitano, Luis Reynaldo Ferracciu Alleoni, Valdemar Luiz TornisieloAbstract:Imazaquin is an acid herbicide widely used in Brazil to control weeds associated to the soybean crop. The purpose of this research was to study imazaquin sorption and its relation to CEC, pH and organic carbon (OC) and clay contents of eleven tropical soil samples. In order to establish the sorption isotherms, imazaquin solutions at concentrations of 0.53, 0.88, 1.45, 2.71, and 5.20 mg mL-1 were prepared in 0.005 mol L-1 CaCl2 solution with the addition of radiolabeled tracer (14C-imazaquin). The sorption coefficients (Kf) were calculated according to the linear shape of the Freundlich isotherm equation. Imazaquin sorption ranged from low to moderate (Kf < 3.0), except for the Aquox soil. OC content and pH were the soil attributes that best correlated to imazaquin sorption. The incorporation of clay content in the regression analysis increased the model´s precision by 20 %. Imazaquin shows higher availability and, therefore, higher Leaching Potential when applied to soils with pH higher than 6 and low contents of OC and clay.
Victor W C Chang - One of the best experts on this subject based on the ideXlab platform.
-
statistical comparison of Leaching behavior of incineration bottom ash using seawater and deionized water significant findings based on several Leaching methods
Journal of Hazardous Materials, 2018Co-Authors: Ke Yin, Wei Ping Chan, Xiaomin Dou, Fei Ren, Victor W C ChangAbstract:Bottom ashes generated from municipal solid waste incineration have gained increasing popularity as alternative construction materials, however, they contains elevated heavy metals posing a challenge for its free usage. Different Leaching methods are developed to quantify Leaching Potential of incineration bottom ashes meanwhile guide its environmentally friendly application. Yet, there are diverse IBA applications while the in situ environment is always complicated, challenging its legislation. In this study, Leaching tests were conveyed using batch and column Leaching methods with seawater as opposed to deionized water, to unveil the metal Leaching Potential of IBA subjected to salty environment, which is commonly encountered when using IBA in land reclamation yet not well understood. Statistical analysis for different Leaching methods suggested disparate performance between seawater and deionized water primarily ascribed to ionic strength. Impacts of leachant are metal-specific dependent on Leaching methods and have a function of intrinsic characteristics of incineration bottom ashes. Leaching performances were further compared on additional perspectives, e.g. Leaching approach and liquid to solid ratio, indicating sophisticated Leaching Potentials dominated by combined geochemistry. It is necessary to develop application-oriented Leaching methods with corresponding Leaching criteria to preclude discriminations between different applications, e.g., terrestrial applications vs. land reclamation.
-
review of mswi bottom ash utilization from perspectives of collective characterization treatment and existing application
Renewable & Sustainable Energy Reviews, 2017Co-Authors: Minh Quan Nguyen, Ashiq Ahamed, Wei Ping Chan, Victor W C ChangAbstract:Municipal solid waste incineration (MSWI) bottom ash has gained increasing attentions for its friendly application worldwide, due to promotion of waste recycling. One of the biggest concerns for incineration bottom ash (IBA) utilization lies in its elevated metal concentrations and Leaching Potential. While challenges faced by the user are miscellaneous based on several aspects—regulations and rules, the heterogeneity of IBA sources, specific risks arisen from individual applications and/or mixed public views, etc. Extensive knowledge on IBA characterization, existing treatment and application contributes to optimize life cycle of the bottom ash, herein enhancing the IBA management practices. On the understanding that both feedstock and the process for incineration are various, properties, treatments and applications of the IBA are accordingly different. Nevertheless, literature reviewed data indicate evidently that IBA, varying in its original resources and treatment facilities though, shares common geotechnical and chemical properties. As the technology development on the IBA is dominated by these common properties, through which the proper treatment and application could be well determined. In this review three perspectives were concentrated. First, general properties of IBA e.g. heavy metals and their Leaching Potential, bulk components, particle size distribution and pH were investigated, whereby the general trends were indicated with collective plots. Secondly, the existing status quo on IBA treatment methods and applications were investigated, suggesting a highest Potential as low-strength aggregates. Thirdly, toxicity studies and LCA on IBA as emerging research topics were also investigated, to further justify its application feasibility.