Search

In this research, three highly efficient combination systems, including constructed wetland microbial fuel cell (CWMFC), hydrolytic sludge acidification coupling with constructed wetland microbial fuel cell (HSA-CWMFC) and hydrolytic filler acidification coupling with constructed wetland microbial fuel cell (HFA-CWMFC), were applied to the removal of pollutants from domestic sewage. The three combination systems could effectively treat domestic sewage and generate clean energy. The power generated by CWMFC, HSA-CWMFC, and HFA-CWMFC was 0.36 W/m2, 0.40 W/m2, and 0.43 W/m2, respectively. The results indicated that the removal rates of chemical oxygen demand (COD), total organic carbon (TOC), total phosphorus (TP), ammonia nitrogen (NH 3 –N), and nitrate nitrogen (NO 3 −-N) in HFA-CWMFC could achieve the optimal values of 91.01%, 90.63%, 95.35%, 86.11%, and 91.01%, respectively. In addition, HFA-CWMFC produced more organic acids than HSA-CWMFC, which was beneficial to the follow-up reaction. Through qualcomm sequencing analysis, it could be seen that Firmicutes , which could enhance power generation capacity and increase removal rates of pollutants, played an important role in HFA-CWMFC. The results demonstrated that the three combined systems had excellent application prospects for sewage treatment and energy generation. [Display omitted] ● The hydrolytic combination systems had remarkable effect on pollutants removal. ● The hydrolytic filler combination system could obviously remove pollutants. ● Microbial community in the hydrolytic filler combination system was more abundant. [ABSTRACT FROM AUTHOR]

In this research, Ti/SnO 2 –RuO 2 stable anode was successfully prepared by thermal decomposition method, and low concentration cefotaxime sodium (CFX) was degraded by green and sustainable electrocatalytic oxidation technology. The electrocatalytic activity and stability of the Ti/SnO 2 –RuO 2 coating electrode were studied according to the polarization curve of oxygen and chlorine evolution. The effects of current density, initial concentration, pH, electrolyte concentration, and other technological parameters on the degradation efficiency were discussed. Orthogonal experiment results indicated that when the current density was 25 mA cm−2, concentration of electrolyte was 5 mM and the pH value was 7, the best CFX removal rate of 86.33% could be obtained. The degradation efficiency of electrocatalytic oxidation was discussed through electrochemical analysis. Fourier transform infrared spectroscopy was used to analyze the different inlet and outlet stages before and after the degradation of CFX, and the possible degradation process was discussed. Therefore, the electrocatalytic oxidation of Ti/SnO 2 –RuO 2 electrode was a clean and efficient technology, which could be widely used in the treatment of CFX wastewater. [Display omitted] • SnO 2 and RuO 2 are used as dopant to DSA to the degradation of cefotaxime sodium. • Ti/SnO 2 –RuO 2 anode displays excellent stability and electrochemical activity. • ·OH and ClO− play a decisive role in the removal of cefotaxime sodium. • Cefotaxime sodium removal efficiency of 86.33% is reached. [ABSTRACT FROM AUTHOR]

• PVA modification has adverse effect on the compressive strength of ECC. • Nanomaterials act on the early stage of ECC toughness improvement. • Modified PVA act on the whole cycle of ECC toughness improvement. Nanomaterial modification and fiber reinforcement are both effective modifications for concrete toughening. In this study, the cement matrix was reinforced by a combination of nanomaterials and surface-modified polyvinyl alcohol (PVA). The modification of PVA involves the treatment of interface weakening, which is based on the enhancement of the slip effect. The workability and static mechanical properties of engineered cementitious composites (ECCs) were studied, and the micromorphology of the fiber and matrix after bending failure was observed through scanning electron microscopy. Different nanomaterial contents and concentrations of PVA were designed in the experiment, the purpose of which is to investigate the mechanism of the effect of multiple superposed on the toughening effect of ECCs. The research demonstrated that the direct addition of traditional PVA fiber and nanomaterials adversely affects the workability of ECCs, but it can be improved by fiber modification and ultrasonic dispersion of nanomaterials. An experimental study on the compressive properties showed that, with the increase in PVA fiber modification concentration, the compressive strength decreased, but the addition of nano-CaCO 3 improved the strength of the matrix, thereby compensating for the strength loss. Four-point bending and tensile tests demonstrated that both PVA fiber modification and the addition of nano-CaCO 3 affected the flexural properties of ECCs to some extent. PVA fibers modified with 1% and 2% nano-CaCO 3 at vinyl acetate ethylene concentrations of 25% and 50% can improve the toughness of ECCs. Nano-CaCO 3 can improve the toughness of ECCs by improving the compactness of the matrix structure and fiber interface, while PVA fiber can supplement the defects of the matrix structure by bridging and sliding and have a positive superposition effect on the toughness of the material after proper treatment. [ABSTRACT FROM AUTHOR]