排序方式: 共有59条查询结果,搜索用时 46 毫秒
1.
2.
3.
4.
闪耀在潜水员心目中的海底珍宝人们一直毫不动摇地坚信:漫漫无际的大洋底下,蕴藏着价值数以亿计美元的黄金宝库。而潜水员梦想中的海底宝库及珍宝,则大都是十五至十八世纪的西班牙大帆船,因为这种船里拥藏的珍宝最惊人。事实上也是如此。公元1492~1820年间,西班牙殖民主义者从他们的新大陆采矿场里,掠取了不下50亿比索(拉美许多国家流行的一种货币)的金银,其中 相似文献
5.
6.
7.
8.
9.
Kinetics of municipal sewage degradation in Expanded Granular Sludge Bed (EGSB) and Up-flow Anaerobic Sludge Blanket (UASB) reactors at 10℃ were investigated via continuous experimental equipments. The results indicated that the whole reaction process can be simulated by the first-order dynamic equation model. Dynamic parameters such as k, Vmax and Ks of UASB in hydrolysis acidification stage were 1.08 d^-1 , 2.8 d^-1 and 372 mg/L comparing to those of 1.18 d^-1 , 3.5 d^-1 and 112 mg/L in the methanogenesis stage respectively. The EGSB's k, Vmax and Ks were 2.91 d^-1 , 14.3 d^-1 and 470 mg/L in the hydrolysis acidification stage comparing to those of 1.68 d^-1, 6.6 d^-1 and 103 mg/L in the methanogenesis stage respectively. Comparison of k values of the two stages in UASB and EGSB indicates that hydrolysis acidification stage is the controlling step for the whole reaction process of UASB, while methanogenesis stage is the controlling step in EGSB. Compared with UASB, municipal sewage treatment by EGSB at 10 ℃ can reach the same effluent requirement with lower retention time due to its effluent recirculation. 相似文献
10.