Study on the Influence of C/N Ratio on Denitrification Efficiency in CRI System

Abstract

Abstract. The TN removal efficiency is very low and the TN concentration of effluent can not meet the national standard of GB18918-2002 in the CRI system. In order to increasingly improve the denitrification efficiency of the CRI system, the artificial soil column is used to simulate the CRI system with 4 kinds of wastewater step-feeding modes. A series of comparative experiments are carried out, and the experimental results show that the TN removal efficiency of the CRI system is controlled by the denitrification process, and the denitrification process takes place mainly in the 900-1400mm zone of the artificial soil column; with the step-feeding mode, the C/N ratios of effluent from the 900-1400mm zone increase obviously in the CRI system, and in the case 4, the C/N ratios of effluent from the 900-1400mm zone are about 2, which is the closest to the optimal C/N ratio of the denitrification process; the best wastewater feeding mode of the CRI system is that the wastewater is pumped into the system from the infiltration media surface and the starting point of the anaerobic zone at the same time, with the influent amount ratio of 2:1.

Hierarchical metal-oxide nanostructures for high-performance supercapacitor electrodes

“…In electrochemical test, the solid-state supercapacitor showed anIntroductionAs to flexible conductive substrate, nickel foam has aroused many interests for loading of active materials in supercapacitor application, mainly due to its very good conductivity and 3D network structure that would reduce the diffusion resistance of electrolyte and provide ideal electron pathway. Besides, nickel foam can load more active materials per unit area than flat substrate (such as FTO and Ni foil) and it is also a commercialized cheap material 28,36,56,57,90,161,165,166. By XPS and CV measurements, research efforts have found Ni foam surface is mostly metallic in nature, while long-time exposing to moist air will result in passivated and metallic sections on the surface, which make Ni foam stable even under high temperature annealing in an oxidizing environment 167 .…”