The Experts below are selected from a list of 87 Experts worldwide ranked by ideXlab platform

Zhaoyang Wang - One of the best experts on this subject based on the ideXlab platform.

  • Performance and mechanism of methylene blue degradation by an electrochemical process
    RSC Advances, 2020
    Co-Authors: Teng Xiaolei, Zhaoyang Wang, Wei Zhen, Chen Cuizhong, Du Keqing, Chun Zhao, Guang Yang
    Abstract:

    An exciting electrochemical oxidation (EO) process has been developed. Compared with electro-Fenton (EF) and electro-coagulation (EC) processes, this process had more advantages in the degradation of methylene blue. It is observed that methylene blue can be quickly degraded by EO, in which an iron rod is used as an anode, graphite is used as a cathode, and fly ash–red Mud Particles are used as Particle electrodes. Compared to EC and EF processes that are affected by specific pH values, EO has excellent performance in the pH range of 3.0–11.0. In addition, the electric energy consumption (EEC) of EF, EC and EO is 81.51, 36.55 and 21.35 kW h m−3 respectively, suggesting EO is more economical. The free radical scavenging mechanism of i-PrOH is studied, and the contribution of EC, EF and fly ash–red Mud Particle electrodes in EO is inferred. Particle electrodes before and after use are characterized by SEM, EDS and BET to illustrate the role of Particle electrodes in the EO system. Analysis of flocs and solutions by FTIR and GC-MS proves that EO can effectively degrade methylene blue, and the degradation route of methylene blue is speculated. The Particle electrode dissolution experiment shows that the prepared fly ash–red Mud Particle electrode is considered to be suitable and safe for wastewater treatment. Finally, in actual surface water experiments, the EO process still has great potential.

  • Production of Red Mud Particle Electrodes (RMPEs) and Its Performance Investigation in a Biological Aerated Filter Coupled with a Three-Dimensional Particle Electrode Reactor (BAF-TDE)
    Industrial & Engineering Chemistry Research, 2015
    Co-Authors: Yan Feng, Xinwei Wang, Zhaoyang Wang
    Abstract:

    Novel Particle electrodes—red Mud Particle electrodes (RMPEs)—were prepared using waste material (red Mud, zeolite slag, and ferric oxide powder with a mass ratio of 5:3:2 and used in a biological aerated filter coupled with a three-dimensional Particle electrode reactor (BAF-TDE)) for use in municipal wastewater treatment. The physical and chemical characteristics of RMPEs were measured. The surface morphology of the RMPEs was also characterized by SEM. The results showed that (1) under the optimal sintering conditions, red Mud could be used to manufacture RMPEs; (2) BAF-TDE had an advantage over the single biological aerated filter (BAF), with regard to the removal of organic matter and ammonia nitrogen; and (3) in the BAF-TDE system, BAF contributed more to the removal of organic matter and ammonia nitrogen than TDE did, while TDE played a crucial important role in BAF-TDE, which can be improved by introducing an electric field.

Ryota Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • Experimental and analytical investigation of the response of a Mud layer to solitary waves
    Ocean Dynamics, 2020
    Co-Authors: Mohsen Soltanpour, Tomoya Shibayama, S. Hadi Shamsnia, Ryota Nakamura
    Abstract:

    Although the different aspects of wave-Mud interaction have been studied by many researchers, few studies have been conducted on the effect of solitary wave on the Particle velocities formed in the layers of cohesive sediments. The main objective of the present study is to investigate different features of the Mud mechanical responses to the solitary wave loadings. This paper describes a comprehensive study of solitary wave-Mud interaction by means of sets of laboratory tests, in which time series of the velocity in the water and Mud layers, as well as free-surface evolutions, were measured. Wave damping and several aspects of the mechanical response of the Mud layer to solitary wave loadings, e.g. Mud Particle velocities, the ratio between positive and negative peak velocities, time shift between peak velocities in the Mud and water layer and the Mud movement period, were studied through nondimensional parameters. It was shown that, at higher values of the Mud water content ratio, the time shifts between the peak velocities in the Mud and water layers decrease, whereas the Mud movement period and the ratio of the positive to the negative peaks increase. Similar trends were observed as the height of the solitary wave was increased. A viscous analytical two-layered model has been developed. Comparing to the measurements, the present model and the model of Liu and Chan (J Fluid Mech 579:467–480, 2007 ) presented a similar behaviour for simulating the mechanical response of Mud under the action of a solitary wave and both models performed better than the model of Jiang and Zhao (J Waterw Port Coast Ocean Eng 115:345–362, 1989 ).

  • A study on Mud Particle velocities and mass transport in wave-current-Mud interaction
    Applied Ocean Research, 2018
    Co-Authors: Mohsen Soltanpour, Tomoya Shibayama, S. Hadi Shamsnia, Ryota Nakamura
    Abstract:

    Abstract The upper fluid Mud layer in Muddy environments absorbs wave energy and, in turn, moves due to the wave action. In addition to these two major phenomena of wave-Mud interaction, introduction of current in the wave field also changes the wave characteristics as well as the rates of Mud mass transport. The present study offers an experimental investigation of wave-current-Mud interaction to address the wave transformation and Mud mass transport on a horizontal bed. A number of laboratory tests were conducted to measure the Mud Particle velocities as well as wave attenuation rates under following, opposing, and no current conditions. Both the wave energy dissipation and Mud mass transport increase with the presence of opposing currents and decrease when following currents are introduced. A semi-analytical model was also presented and the numerical results are compared with the laboratory experiments, showing acceptable agreements.

Guang Yang - One of the best experts on this subject based on the ideXlab platform.

  • Performance and mechanism of methylene blue degradation by an electrochemical process
    RSC Advances, 2020
    Co-Authors: Teng Xiaolei, Zhaoyang Wang, Wei Zhen, Chen Cuizhong, Du Keqing, Chun Zhao, Guang Yang
    Abstract:

    An exciting electrochemical oxidation (EO) process has been developed. Compared with electro-Fenton (EF) and electro-coagulation (EC) processes, this process had more advantages in the degradation of methylene blue. It is observed that methylene blue can be quickly degraded by EO, in which an iron rod is used as an anode, graphite is used as a cathode, and fly ash–red Mud Particles are used as Particle electrodes. Compared to EC and EF processes that are affected by specific pH values, EO has excellent performance in the pH range of 3.0–11.0. In addition, the electric energy consumption (EEC) of EF, EC and EO is 81.51, 36.55 and 21.35 kW h m−3 respectively, suggesting EO is more economical. The free radical scavenging mechanism of i-PrOH is studied, and the contribution of EC, EF and fly ash–red Mud Particle electrodes in EO is inferred. Particle electrodes before and after use are characterized by SEM, EDS and BET to illustrate the role of Particle electrodes in the EO system. Analysis of flocs and solutions by FTIR and GC-MS proves that EO can effectively degrade methylene blue, and the degradation route of methylene blue is speculated. The Particle electrode dissolution experiment shows that the prepared fly ash–red Mud Particle electrode is considered to be suitable and safe for wastewater treatment. Finally, in actual surface water experiments, the EO process still has great potential.

Mohsen Soltanpour - One of the best experts on this subject based on the ideXlab platform.

  • Experimental and analytical investigation of the response of a Mud layer to solitary waves
    Ocean Dynamics, 2020
    Co-Authors: Mohsen Soltanpour, Tomoya Shibayama, S. Hadi Shamsnia, Ryota Nakamura
    Abstract:

    Although the different aspects of wave-Mud interaction have been studied by many researchers, few studies have been conducted on the effect of solitary wave on the Particle velocities formed in the layers of cohesive sediments. The main objective of the present study is to investigate different features of the Mud mechanical responses to the solitary wave loadings. This paper describes a comprehensive study of solitary wave-Mud interaction by means of sets of laboratory tests, in which time series of the velocity in the water and Mud layers, as well as free-surface evolutions, were measured. Wave damping and several aspects of the mechanical response of the Mud layer to solitary wave loadings, e.g. Mud Particle velocities, the ratio between positive and negative peak velocities, time shift between peak velocities in the Mud and water layer and the Mud movement period, were studied through nondimensional parameters. It was shown that, at higher values of the Mud water content ratio, the time shifts between the peak velocities in the Mud and water layers decrease, whereas the Mud movement period and the ratio of the positive to the negative peaks increase. Similar trends were observed as the height of the solitary wave was increased. A viscous analytical two-layered model has been developed. Comparing to the measurements, the present model and the model of Liu and Chan (J Fluid Mech 579:467–480, 2007 ) presented a similar behaviour for simulating the mechanical response of Mud under the action of a solitary wave and both models performed better than the model of Jiang and Zhao (J Waterw Port Coast Ocean Eng 115:345–362, 1989 ).

  • A study on Mud Particle velocities and mass transport in wave-current-Mud interaction
    Applied Ocean Research, 2018
    Co-Authors: Mohsen Soltanpour, Tomoya Shibayama, S. Hadi Shamsnia, Ryota Nakamura
    Abstract:

    Abstract The upper fluid Mud layer in Muddy environments absorbs wave energy and, in turn, moves due to the wave action. In addition to these two major phenomena of wave-Mud interaction, introduction of current in the wave field also changes the wave characteristics as well as the rates of Mud mass transport. The present study offers an experimental investigation of wave-current-Mud interaction to address the wave transformation and Mud mass transport on a horizontal bed. A number of laboratory tests were conducted to measure the Mud Particle velocities as well as wave attenuation rates under following, opposing, and no current conditions. Both the wave energy dissipation and Mud mass transport increase with the presence of opposing currents and decrease when following currents are introduced. A semi-analytical model was also presented and the numerical results are compared with the laboratory experiments, showing acceptable agreements.

Yan Feng - One of the best experts on this subject based on the ideXlab platform.

  • Production of Red Mud Particle Electrodes (RMPEs) and Its Performance Investigation in a Biological Aerated Filter Coupled with a Three-Dimensional Particle Electrode Reactor (BAF-TDE)
    Industrial & Engineering Chemistry Research, 2015
    Co-Authors: Yan Feng, Xinwei Wang, Zhaoyang Wang
    Abstract:

    Novel Particle electrodes—red Mud Particle electrodes (RMPEs)—were prepared using waste material (red Mud, zeolite slag, and ferric oxide powder with a mass ratio of 5:3:2 and used in a biological aerated filter coupled with a three-dimensional Particle electrode reactor (BAF-TDE)) for use in municipal wastewater treatment. The physical and chemical characteristics of RMPEs were measured. The surface morphology of the RMPEs was also characterized by SEM. The results showed that (1) under the optimal sintering conditions, red Mud could be used to manufacture RMPEs; (2) BAF-TDE had an advantage over the single biological aerated filter (BAF), with regard to the removal of organic matter and ammonia nitrogen; and (3) in the BAF-TDE system, BAF contributed more to the removal of organic matter and ammonia nitrogen than TDE did, while TDE played a crucial important role in BAF-TDE, which can be improved by introducing an electric field.