改进型分段进水厌氧/缺氧/好氧工艺强化营养物去除

In order to enhance phosphorus removal in traditional step-feed anoxic/oxic nitrogen removal process,a modified pilot-scale step-feed anaerobic/anoxic/oxic (SFA²/O) system was developed,which combined a reactor similar to UCT-type configuration and two-stage anoxic/oxic process.The simultaneous nitrogen and phosphorus removal capacities and the potential of denitrifying phosphorus removal,in particular,were investigated with four different feeding patterns using real municipal wastewater.The results showed that the feeding ratios(Q₁)in the first stage determined the nutrient removal performance in the SFA²/O system.The average phosphorus removal efficiency increased from 19.17% to 96.25% as Q₁ was gradually increased from run 1 to run 4,but the nitrogen removal efficiency exhibited a different tendency,which attained a maximum 73.61% in run 3 and then decreased to 59.62% in run 4.As a compromise between nitrogen and phosphorus removal,run 3 (Q₁=0.45Q_total) was identified as the optimal and stable case with the maximum anoxic phosphorus uptake rate of 1.58mg·(g MLSS)^-1·h^-1.The results of batch tests showed that ratio of the anoxic phosphate uptake capacity to the aerobic phosphate uptake capacity increased from 11.96% to 36.85% with the optimal influent feeding ratio to the system in run 3,which demonstrated that the denitrifying polyP accumulating organisms could be accumulated and contributed more to the total phosphorus removal by optimizing the inflow ratio distribution.However,the nitrate recirculation to anoxic zone and influent feeding ratios should be carefully controlled for carbon source saving.     

苛化单层澄清器的结构设计及其应用

苛化单层澄清器作为一种固液分离设备在造纸厂的苛化工段被广泛采用,近几年来有了很大发展,文章介绍了苛化单层澄清器工作原理、各部分的结构设计以及实际应用情况.     

DVD跨轨伺服控制的优化设计

针对DVD光盘技术要求伺服控制系统的控制精度不断提高,尤其是对于跨轨伺服控制的要求更加苛刻的问题,为了更好地优化伺服控制的控制策略,利用Matlab提供的模糊控制工具箱,计算出模糊PD控制的系数整定规则表。系统根据外界干扰的变化实时改变相应的控制参数,达到提高DVD跨轨伺服控制环路的控制要求和控制精度的目的。实验表明,该方法使激光读取头能够以更短的时间和更快的速度到达目标轨迹。     

公路立交桥区积滞水治理的探讨与对策

近年来伴随着全球气候环境的恶化,极端天气出现的频率增加,公路立交桥区频繁出现积滞水,导致道路交通中断,人员滞留,引发了人们的广泛关注。笔者结合北京"7.21"特大暴雨后对部分公路立交易积滞水点的治理工程实践,就公路立交的积水原因和治理措施进行总结和探讨。     

污水生物脱氮技术研究新进展

介绍了几种污水生物脱氮新工艺:SHARON和OLAND工艺、厌氧氨氧化(ANAMMOX)、SHARON-ANAMMOX组合、全程自养短程脱氮(CANON)、反氨化(De-ammonification)、NOx工艺(NOx cy-cle)。