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Soluble trivalent manganese solution can be used as an electrolyte for manganese redox flow battery (MRFB), due to its low cost, environmental friendliness and multiple states of charge. However, poor stability of soluble trivalent manganese solution and low trivalent manganese concentration are the disadvantages of electrolyte. To optimize the stability and conductivity of soluble trivalent manganese solution, the sulfuric acid concentration, one of the major influence factors, should be firstly improved. Two-compartment cell electrolysis technology was successfully used in this work. Moreover, to improve the concentration of Mn3+, some key factors, such as the concentration of MnSO4, current density, electrolysis time and temperature, should be further adjusted. The results demonstrated that the concentration of this produced trivalent manganese (≧ 0.3 M in 6 M H2SO4;≧ 0.4 M in 5 M H2SO4;≧ 0.5 M in 4 M H2SO4) is much higher than that have been reported. Solid product of manganese(III) sulfate was also firstly prepared. For the formation of soluble trivalent manganese, the 5 mol/L H2SO4 is the optimal acidity and 10.9 mA/cm2 is the best current density at 273 K for 3 h. Some electrochemical kinetics parameters had also been calculated (electrolyte is 5 M H2SO4 and 0.4 M MnSO4), e.g., diffusion coefficient of Mn2+ is 5.3057 × 10−6 cm2/s, transfer coefficient of electrode reaction is 0.3782, and exchange current density is 1.5662 × 10−4 A/cm2. The CV results demonstrated that the redox process of Mn(III)/Mn(II) is the quasi-reversible process.

A novel halophilic bacterium capable of heterotrophic nitrification-aerobic denitrification was isolated from marine sediments and identified as Vibrio diabolicus SF16. It had ability to remove 91.82% of NH4(+)-N (119.77 mg/L) and 99.71% of NO3(-)-N (136.43 mg/L). The nitrogen balance showed that 35.83% of initial NH4(+)-N (119.77 mg/L) was changed to intracellular nitrogen, and 53.98% of the initial NH4(+)-N was converted to gaseous denitrification products. The existence of napA gene further proved the aerobic denitrification ability of strain SF16. The optimum culture conditions were salinity 1-5%, sodium acetate as carbon source, C/N 10, and pH 7.5-9.5. When an aerated biological filter system inoculated with strain SF16 was employed to treat saline wastewater, the average removal efficiency of NH4(+)-N and TN reached 97.14% and 73.92%, respectively, indicating great potential of strain SF16 for future full-scale applications.

The third harmonic system at 3.9 GHz of the European XFEL (E-XFEL) injector section will linearize the bunch RF curvature, induced by first accelerating module, before the first compression stage and it is a joint INFN and DESY contribution to the project. This paper presents the status of the fabrication of the 3.9 GHz cavity series in view of the XFEL injector commissioning in 2015., Proceedings of the 5th Int. Particle Accelerator Conf., IPAC2014, Dresden, Germany

In the framework of the ESS activity in progress at INFN-LASA, we are designing and developing 704.42 MHz Medium (β=0.67) and High (β=0.86) beta prototype cavities plug compatible with the ESS cryomodule design. The cells of one Medium and one High beta cavity are fabricated with high quality CBMM Large Grain Niobium (480 mm dia. Ingot, RRR=300, sliced by Heraeus) while a Medium beta cavity is done with Fine Grain material for comparison. The prototype cavities will be produced by the firm Ettore Zanon S.p.A. under the supervision of INFN - LASA group., Proceedings of the 7th Int. Particle Accelerator Conf., IPAC2016, Busan, Korea