Aims:  Denitrification efficiency at 10% salinity was compared with that at 2% salinity. The characteristics of bacterial strains isolated from the denitrification system, where an improvement of denitrification efficiency was observed at a high salinity were investigated. Methods and Results:  Two continuous feeding denitrification systems for saline solutions of 2% and 10% salinity, were operated. Denitrification efficiency at 10% salinity was higher than that at 2% salinity. The bacterial strains were isolated using the trypticase soy agar (TSA) medium at 30°C. The phylogenetic analysis of 16S rRNA gene sequences of isolates indicated that halophilic species were predominant at 10% salinity. Conclusions:  The improvement of denitrification efficiency at a high salinity was demonstrated. The strains isolated from the denitrifying system with 10% salinity were halophilic bacteria, Halomonas sp. and Marinobacter sp., suggesting that these bacteria show a high denitrifying activity at 10% salinity. Significance and Impact of the Study:  The long‐term acclimated sludge used in this study resulted in high denitrification performance at a high salinity, indicating that the design of a high‐performance denitrification system for saline wastewater will be possible.

In this study, we analyze energy consumption of FC-EDLC hybrid railway vehicle to reveal the energy reduction effect. To evaluate this effect properly, we adopt dynamic programming which is optimal control theory. Dynamic programming enables us to calculate energy consumption under optimized control of power sources. In this paper, we evaluate the relationship among reduction effect of energy consumption, device capacity, and line profiles. Finally, we reveal the energy consumption characteristics and the applicability of hybrid-power-source railway vehicle.

The harmonics of the return current may interfere with the signaling current along with the rails. In this paper, we present the theoretical studies of the return current harmonics in the inverter-controlled DC electric railcar, aiming at contributing future work to improve the compatibility with the signaling current.We theoretically derive sideband harmonics of the DC-link current. Then, in order to verify the theoretical study, we experimentally measure the harmonics and numerically simulate the harmonics. As a result, we concluded the theoretical DC-link current is enough accurate to be utilized for the future improvement of the inverter harmonics current.

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