In this study, a ‘‘direct-starting'' procedure was used to activate a single-chamber biocathode microbial electrolysis cell(MEC) and the development of a biocathode was studied through output current curves ...In this study, a ‘‘direct-starting'' procedure was used to activate a single-chamber biocathode microbial electrolysis cell(MEC) and the development of a biocathode was studied through output current curves and cyclic voltammograms. It only took 163 h for a successful start-up, and a current density of 14.75 A/m^2 was obtained. In the formal hydrogen-production stage, it was found that the biocathode MEC was comparable with the Pt/C cathode MEC in terms of current density and energy efficiency, and the hydrogen recovery, cathodic hydrogen recovery, and hydrogen production rate of the biocathode MEC were 71.22% ± 8.98%, 79.42% ± 5.94%, and 0.428 ± 0.054 m^3 H_2/m^3 days, respectively, which were slightly higher than those obtained with the Pt/C cathode MEC. Besides, under the effect of applied voltage, the microbial populations in the anodophilic biofilm of MEC(MECan) and the cathodophilic biofilm of MEC(MECca) were less diverse than those of the original aerobic activated sludge(AAS) and the anodophilic biofilm of MEC(MECan). Furthermore, the microbial community structures evidently differed between MECan/MECca and AAS/MFC.展开更多
Analyzed working principle and starting process of asynchronous motor direct torque control system. In order to solve the problem of serious fluctuation of starting current in traditional control scheme, the author pu...Analyzed working principle and starting process of asynchronous motor direct torque control system. In order to solve the problem of serious fluctuation of starting current in traditional control scheme, the author puts forward a new kind of starting method which can limit voltage value to achieve the goal of reducing fluctuation of the current by increasing zero voltage vectors during the stage of starting. The author has also carried on simulation study on the system, and the result of simulation study shows that this method is effectual.展开更多
基金funded by the National Natural Science Foundation of China (Grant No. 51703151)the Natural Science Foundation of Shanxi Province of China (Grant No. 201601D011023)
文摘In this study, a ‘‘direct-starting'' procedure was used to activate a single-chamber biocathode microbial electrolysis cell(MEC) and the development of a biocathode was studied through output current curves and cyclic voltammograms. It only took 163 h for a successful start-up, and a current density of 14.75 A/m^2 was obtained. In the formal hydrogen-production stage, it was found that the biocathode MEC was comparable with the Pt/C cathode MEC in terms of current density and energy efficiency, and the hydrogen recovery, cathodic hydrogen recovery, and hydrogen production rate of the biocathode MEC were 71.22% ± 8.98%, 79.42% ± 5.94%, and 0.428 ± 0.054 m^3 H_2/m^3 days, respectively, which were slightly higher than those obtained with the Pt/C cathode MEC. Besides, under the effect of applied voltage, the microbial populations in the anodophilic biofilm of MEC(MECan) and the cathodophilic biofilm of MEC(MECca) were less diverse than those of the original aerobic activated sludge(AAS) and the anodophilic biofilm of MEC(MECan). Furthermore, the microbial community structures evidently differed between MECan/MECca and AAS/MFC.
文摘Analyzed working principle and starting process of asynchronous motor direct torque control system. In order to solve the problem of serious fluctuation of starting current in traditional control scheme, the author puts forward a new kind of starting method which can limit voltage value to achieve the goal of reducing fluctuation of the current by increasing zero voltage vectors during the stage of starting. The author has also carried on simulation study on the system, and the result of simulation study shows that this method is effectual.
