浅析有源电力滤波器在印钞设备中的应用

简述了电力系统谐波的基础理论及其危害,根据企业实际存在的问题,对印钞设备的谐波分量测量,给出了印钞设备工作时产生的谐波畸变图形,通过分析比较,选用施耐德AccuSine有源电力滤波器,并联安装于印钞机电源进线位置。通过投入使用前后的电流、电压波形和电流电压谐波含量比较,证实有源滤波器使印钞机的谐波畸变率由22.4%下降到2.4%。最后介绍了AccuSine有源电力滤波器的技术原理。     

瓷珠曝气生物滤池去除源水中氨氮研究

采用以瓷珠为填料的曝气生物滤池(BAF)预处理某高氨氮源水,结果表明,在气水比为1∶1、滤速为5. 5m/h、水温>10℃的条件下,当进水氨氮<5mg/L时BAF对氨氮的去除率为70% ~90%,反应器中存在一定的亚硝酸氮积累;反冲洗周期对氨氮的去除率有较大影响。     

AERATED ROCK FILTERS FOR ENHANCED AMMONIA AND FAECAL COLIFORM REMOVAL FROM FACULTATIVE POND EFFLUENTS

Nitrogen removal from wastewater is rapidly becoming an essential but expensive upgrade for many small wastewater treatment works in the UK. Using a pilot-scale waste stabilization pond effluent, this paper highlights a low-cost upgrading unit, capable of removing BOD, SS, ammonia and faecal colliforms. Results are given for 12 months of operation and it is suggested that these units could be used by the water companies when ammonia removal is necessary to meet with current legislative demands and prevent eutrophication of receiving watercourses.     

Selection of an adsorbent for lead removal from drinking water by a point-of-use treatment device

The removal of lead from drinking water was investigated to develop a point-of-use water filter that could meet the regulation imposed by the new European Directive 98-83 lowering lead concentration in drinking water below 10 μg L⁻¹. The objective of this research was to assess the potential of different adsorbents (zeolites, resins, activated carbon, manganese oxides, cellulose powder) to remove lead from tap water with a very short contact time. To begin, the repartition of the lead species in a tap water and a mineral water was computed with the computer model CHESS. It showed that in bicarbonated waters lead is mainly under lead carbonate form, either in the aqueous or in the mineral phase. Batch experiments were then conducted to measure the equilibrium adsorption isotherms of the adsorbents. Then, for five of them, dynamic experiments in micro-columns were carried out to assess the outlet lead concentration level. Three adsorbents gave rise to a leakage concentration lower than 10 μg L⁻¹ and were then selected for prototypes experiments: chabasite, an activated carbon coated with a synthetic zeolite and a natural manganese oxide. The proposed method clearly showed that the measurement of equilibrium isotherms is not sufficient to predict the effectiveness of an adsorbent, and must be coupled with dynamic experiments.     

水解酸化/前置反硝化上向流生物滤池工艺处理城镇污水

结合江门市丰乐污水处理厂工程,介绍和总结了水解酸化/前置反硝化上向流生物滤池工艺及其运行情况.试运行期间对COD、SS、BOD5、NH3-N、TP和TN的去除率分别达到88.9%、96.6%、95.4%、97.5%、87.2%和68.4%.该工艺具有占地面积小、处理效果好、水量适应性强、污泥产量少和运行管理方便等特点.     

生物砂滤池处理微污染原水的试验研究

生物砂滤池是在普通砂滤池的石英砂表面培养附着生物膜而形成的强化处理工艺.采用其处理微污染原水,并考察了出水水质,结果表明：生物砂滤池对CODMn的平均去除率由普通砂滤池的13%提高到31.5%左右,对NH4^＋-N的平均去除率由23.5%提高到88.3%左右,对亚硝酸盐氮的平均去除率由零提高到90%左右,出水浊度＜1 NTU,色度＜15度.该工艺在现有普通砂滤池基础上即可实现,是解决微污染水源水质的一条新途径.     

生态别墅屋面雨水过滤器的除污效能研究

针对生态别墅区屋面雨水的处理与资源化利用问题，设计了屋面雨水过滤器，并开展了处理雨水的效能研究。结果表明，该屋面雨水过滤器是一种简易、有效的雨水处理和资源化利用装置，其最大滤速可达22．80m／h。除对浊度、有机物有很好的去除效果外，还能去除部分NH3-N和TP，处理后的出水水质可满足城市杂用水水质标准。     

一种有源滤波器谐波电流检测的改进方法

介绍了一种基于瞬时无功功率理论的改进的谐波电流检测方法，可以在电网不平衡状态下检测出谐波电流。便于工程中有源滤波器只对谐波电流进行补偿。该方法也适用于电网平衡时的谐波电流检测。     

污水的地下渗滤处理系统在农村应用的探讨

结合具体的工程实例，阐述了污水的地下渗滤处理系统的原理，并对其具体工程设计参数及主要参数的计算作了探讨，并对其经济性进行了分析比较，指出地下渗滤处理系统简单可行，值得提倡。     

一种公路路堤施工方法探讨

结合工程实例，对填石路堤的施工工艺进行了介绍，并对浸水路堤路基横断面，反滤层及塑料土工格栅，路基坡面地表处理等填石路堤施工中的一些问题进行了阐述，以提高路基压实度，保证了路面的正常使用。