苯系混合气体生物滴滤器净化性能研究

本研究采用纤维附着活性炭(ACOF)和不锈钢丝网为载体材料,进行了气体生物滴滤器(BTF)净化TEX(甲苯、乙苯、二甲苯)混合气体的动态实验研究。实验结果表明最大消除能力值在140g/m3·h左右。由于载体材料的特殊结构和性能,实验研究中实现了对TEX这类疏水性物质在较少停留时间和较大空塔气速情况下的高效连续运行。高负荷运行时,会由于过剩生物质积累引起装置堵塞、压降增加,但设备净化效果变化不显著。     

AUTOMATED WEB GIS BASED HYDROGRAPH ANALYSIS TOOL,WHAT1

The separation of the base flow component from a varying streamflow hydrograph is called “hydrograph analysis.” In this study, two digital filter based separation modules, the BFLOW and Eckhardt filters, were incorporated into the Web based Hydrograph Analysis Tool (WHAT) system. A statistical component was also developed to provide fundamental information for flow frequency analysis and time series analysis. The Web Geographic Information System (GIS) version of the WHAT system accesses and uses U.S. Geological Survey (USGS) daily streamflow data from the USGS web server. The results from the Eckhardt filter method were compared with the results from the BFLOW filter method that was previously validated, since measured base flow data were not available for this study. Following validation, the two digital filter methods in the WHAT system were run for 50 Indiana gaging stations. The Nash‐Sutcliffe coefficient values comparing the results of the two digital filter methods were over 0.91 for all 50 gaging stations, suggesting the filtered base flow using the Eckhardt filter method will typically match measured base flow. Manual separation of base flow from streamflow can lead to inconsistency in the results, while the WHAT system provides consistent results in less than a minute. Although base flow separation algorithms in the WHAT system cannot consider reservoir release and snowmelt that can affect stream hydrographs, the Web based WHAT system provides an efficient tool for hydrologic model calibration and validation. The base flow information from the WHAT system can also play an important role for sustainable ground water and surface water exploitation, including irrigation and industrial uses, and estimation of pollutant loading from both base flow and direct runoff. Thus, best management practices can be appropriately applied to reduce and intercept pollutant leaching if base flow contributes significant amounts of pollutants to the stream. This Web GIS based system also demonstrates how remote, distributed resources can be shared through the Internet using Web programming.     

自制悬浮物过滤器及其在悬浮物测定中的应用

本文自制悬浮物过滤器，并提出了一种简便的悬浮物标准样品的制备方法。地表水滤液的吸光度值表明，自制悬浮物过滤器藏留悬浮物效果令人满意。该法加标回收率为95．4％～106．8％，检出限为3．2mg／L。尤其适合于强酸、强碱和强氧化性废水中悬浮物的测定。     

攀钢炼铁厂一期矿槽栈桥除尘改造

详细介绍了炼铁厂一期（1#、2#、3#BF）大型高炉矿槽栈桥除尘工程特点，除尘工艺方案确定，尘源控制及系统布置，为集中大型高炉矿槽栈桥除尘设计提供一些经验。     

燃煤电厂袋式除尘器滤料的研究

详细介绍了国内外燃煤电厂袋式除尘器所用滤料的试验研究结果，对滤料的发展方向进行了阐述。并认为燃煤电厂采用袋式除尘器的技术是可靠的。     

吹脱法处理化肥厂氨氮废水的研究

在实验的基础上选用塔滤吹脱——接触氧化工艺处理化肥厂氨氨废水,使出水浓度低于10mg/l;井提出实验室最佳运行参数及工艺流程;采用空气预热的方法较好地解决了严寒地区结冰期吹脱塔运行的问题,通过控制 pH 值和选用塑料条板填料克服了塔内结垢的弊端。     

防火墙在企业网络安全中的应用

信息网络的安全已成为目前企业至关重要的问题,防火墙技术是保护企业信息安全中最基本、最成熟的一种.本文简要介绍了防火墙的主要技术、防火墙体系结构,并对防火墙的选择方案提出了建议.     

紫外分光光度法测定水中矿物油时的水份脱除问题

简要介绍了在水中矿物油的测定过程中，无水硫酸钠铺垫厚度对石油醚萃取液脱水过滤速度及水样测定结果的影响，得出了水样污染越重，石油醚萃取液中含的水份越多，无水硫酸钠铺垫厚度应适当加厚，但测定结果仍满足环境监测要求的结论。     

Soil Moisture Data Assimilation Using Support Vector Machines and Ensemble Kalman Filter1

Abstract: A hybrid data assimilation (DA) methodology that combines two state‐of‐the‐art techniques, support vector machines (SVMs) and ensemble Kalman filter (EnKF), is applied for soil moisture DA in this work. The SVM methodology provides a statistically sound and robust approach to solving the inverse problem, and thus to building statistical models. EnKF is an extension of the Kalman Filter (KF), a well‐known tool in prediction updating. In the present research, ground measurements were used to build a SVM‐type soil moisture predictor. Subsequent observations and their statistics were assimilated to update predictions from the SVM model by coupling it with EnKF. In this way, both model predictions and ground data, as well as their statistics, are fused thus minimizing the prediction error and making the predictions and observations statistically consistent. The results are shown for two approaches; one in which update is done at every time step and the other which assumes that data is only available at alternate time steps (in window of 10 time steps) and hence update is performed at those occasions. The SVM‐EnKF coupling is shown to improve soil moisture forecasts in an example using data from the Soil Climate Analysis Network site at Ames, Iowa.     

悬浮填料滤池固液分离新技术的中试试验研究

本文提出了采用悬浮填料滤池对活性污泥混合液进行固液分离的新技术。该技术所采用的悬浮填料滤池可直接设置在生化反应池末端,取消原工艺中的二沉池。中试试验对悬浮填料滤池的固液分离效果,滤池的运行周期及冲洗方法进行了研究。试验证明,悬浮填料滤池运行稳定,在进水表面负荷高达2.0~3.0 m3/m2.h的情况下出水SS达到城镇污水处理厂污染物二级排放标准(GB18918-2002),工作周期可达到5天以上。悬浮填料滤池可采用曝气方法进行冲洗,操作管理简单,冲洗效果良好,便于实现自动化运行。