军用化工企业含氮废水处理工艺研究

采用厌氧——缺氧——SBR微生物生化处理组合工艺,研究了双基（含双基混合酯）球扁药含氮废水处理技术,通过菌种驯化,实现了高盐浓度、高CODCr含量废水经处理后达标排放,CODCr的总去除率达到97．7％,质量浓度降到96mg／L;BOD5总去除率达到了98．O％,质量浓度降到28mg／L;SS的总去除率达到94．4％,质量浓度降到了9mg／L。     

Experiment study of powder flow feed behavior of laser solid forming

A photographic system for the powder feed process of laser solid forming (LSF) was developed using a high speed camera, and the powder feed behaviors (the particle speed and the powder flow concentration) were described based on the powder flow images. The influences of the powder feed parameters and the distance below the nozzle exit plane on the powder feed behaviors were discussed, and the influences of the powder feed behaviors on the deposited layer quality were also investigated. It can be seen that the smooth finish of the deposited layer surface was improved remarkably by increasing the particle speed, and the deposited layer height decreases with the increase of the particle speed. It can also be found that the variation of the deposited layer height with the increase of the distance between the deposited surface and the nozzle exit plane is similar to that of the powder mass concentrations on the vertical symmetry axis.