Applied Mechanics and Materials Vols. 744-746

Abstract: The setting time was regarded as the selection pressure to make the particles which were unable to get acclimatized to that cultivation circumstance so as to get the aerobic granular sludge which own excellent setting ability with screening and beneficiation. The internal-circulate sequencing batch airlift reactor (SBAR) process was adopted in this experiment to investigate the effect of setting time to the formation of aerobic granular sludge in SBAR under low organic loading. The results showed that aerobic granular sludge with an average particle diameter of 4.0 mm had a good settling ability with spherical or ellipsoidal, smooth and dense on surface, furthermore, the removal rates of NH₃-N,TP and COD_Cr were 96%, 94% and 90% ,respectively. The setting time can be treated as the dominant element for the control of formation and characteristics of aerobic granular sludge to a certain degree in its forming process.

Abstract: The purpose of this experiment was to study the inoculation and start-up, domestication and cultivation of ANAMMOX system and the stable operation after the successful start-up. The experiment used the activated sludge SBR reactor and artificial raw water. The inoculated sludge included nitrification sludge, anaerobic sludge and garden soil exudate. The ANAMMOX s ystem was s uccessfully started on the 114th day after the inoculation. The removal ratio of NH4+-N, NO2-, and NO3- -N mostly was 1:2.8～3.6:0.2～1.8. It could be inferred that in addition to Anammox phenomenon, there was other denitrification process without the participation of external carbon sources in the system In the stable operation period, the sludge was flocculent, and the flocs were dispersed, irregular shaped. The sludge was mixed with a large number of red, dark red particles.

Abstract: In recent years, our some rare earths have been mined improperly, causing some problems like environmental damages and the desertification of land in the mines. There is a necessary to restore them ecologically. In this paper, fuzzy comprehensive evaluation analysis was used to select all evaluating indicators implementing the land reclamation in a mine, and then expert judging method was to evaluate them with their comprehensive subordination degrees and their scores. Not only did these scores showed a good performance, but these solutions gave an example to other mines with a fact that this process was proofed feasible and scientific to evaluate the effectiveness of land reclamation.