Abstract:The rheo-diecasting mold filling capacity and the microstructure of the semi-solid A380 aluminum alloy slurry were investigated. The results show that the mold filling capacity was strengthened with increasing pouring temperature or increasing injection pressure. Under certain process parameters, the mold cavity was fully filled. However, the mold filling capacity decreased with increasing holding time. The mold filling capacity was improved with increasing shape factor of primary α(Al) grains; however, the solid fraction and the grain size significantly increased at the same time. In addition, the microstructures along the route of the spiral samples obviously differed. The grain size decreased gradually from the near-end to the far-end, whereas the shape factor increased gradually.
The objective of this study was to investigate the successful start-up of poor nutrition simulated wastewater with sodium acetate carbon source in an EGSB reactor, and EGSB reactor inoculated the flocculent sludge from the anoxic zone in the municipal sewage treatment plant. The results demonstrated the COD removal efficiency can also achieve more than 80%, even reaching above 95%, when the COD concentration of influent was improved from 200, 500 to 1000 mg/L in the continuous operation of 73 days. Furthermore, the microbial communities of seeding source, sludge samples collected on the 43th day (A1) and at the end of operation (A2) were investigated with the next generation sequences (NGS) tool in the EGSB reactor. Analysis results showed that the microbial diversity decreased. At the bacterial phylum level, there was an apparent increase in relative sequences of Chloroflexi and Euryarchaeota (33.01% and 0.63% in A1, and 44.03% and 7.14% in A2), which was 19.40% and 0.54% in the inoculum. At the genus level, except unclassified genus, Methanosarcina, Clostridium and WCHB1-05 were found to be the main members, whose sum occupied 16.13% and 18.41% of the total sequences in A1 and A2, respectively.
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