Studies on catalytic reduction of nitrate in groundwater

Catalytic reduction of nitrate in groundwater by sodium formate over the catalyst was investigated. Pd-Cu/γ-Al₂O₃ catalyst was prepared by impregnation and characterized by brunauer-emmett-teller (BET), inductive coupled plasma (ICP), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX). It was found that total nitrogen was effectively removed from the nitrate solution (100 mg/L) and the removal efficiency was 87%. The catalytic activity was affected by pH, catalyst amount used, concentration of sodium formate, and initial concentration of nitrate. As sodium formate was used as reductant, precise control in the initial pH was needed. Excessively high or low initial pH (7.0 or 3.0) reduced catalytic activity. At initial pH of 4.5, catalytic activity was enhanced by reducing the amount of catalyst, while concentrations of sodium formate increased with a considerable decrease in N₂ selectivity. In which case, catalytic reduction followed the first order kinetics. Translated from Acta Scientiae Circumstantiae, 2006, 26(4): 567–571 [译自: 环境科学学报]     

多媒体教学在环境教育领域的应用

解决环境问题的重要环节之一是提高公众的环境保护意见，而环境教育是其重要途径。在分析了我国环境教育的现状和特点，以及计算机多媒体辅助教学在教育领域的应用和优势基础上，结合多媒体教学应用于环境教育领域的目的和意义，对多媒体教学在环境教育领域的应用作了探索，并提出了建议。     

棉纺车间噪声综合治理

介绍长达 95m的棉纺车间各噪声点的噪声起源及控制方法     

芝加哥河之友

1979年，一家著名的芝加哥杂志刊登封面文章报道了芝加哥河的污染情况，文章指出该河流被过度滥用，并且被人们忽视，最后作者感叹芝加哥河没有“朋友”。然而该河流还是有关心她的朋友的，就在那年的晚些时候．一些人聚集到了一起，并承诺要恢复芝加哥河的生态。他们成立了“芝加哥河之友”的团体，并投入精力关心河流的改善状况。     

炼油污水回用新工艺中试研究

采用曝气生物滤池 过滤 电吸附工艺对炼油厂二级生化出水进行深度处理,可以进一步降低水中无机盐和有机污染物浓度,出水可以回用于循环冷却水系统作补水,达到节水减排的目的.     

可伸缩接地装置在浮顶罐中的应用

介绍了浮顶罐浮盘与罐壁之间的电气连接--可伸缩接地装置,它易于安装、检测和维护,能快速对地泄放雷电电荷和静电电荷,同时降低雷电流频率下的趋肤效应,尽可能地消除二次电弧,防止油罐密封处产生火花放电引起的火灾.     

燃煤电厂烟气脱硫技术发展现状

综述近年来国内外应用及正在研究开发的脱硫工艺，包括国内应用的石灰石－石膏，海水，磷铵复肥，喷雾干燥，炉内喷钙，电子束烟气脱硫及国外的尿素，改进的石灰石－石膏，再生法脱除ＳＯ２和ＮＯＸ等新方法，并对其中发生的化学反应，特点及存在的问题进行了较详细的分析。     

Isolation and characterization of a bacterial strain that efficiently degrades sex steroid hormones

A bacterial strain, ZY3, growing on sex steroid hormones as the sole source of carbon and energy was isolated from the sewage treatment plant of a prophylactic steroids factory. ZY3 degrades the 3-methoxy-17β-hydroxy-1,3,5(10),8(9)-δ-4-estren (MHE). This strain was preliminarily identified as Raoultella sp. ZY3 according to its morphology and its 16S rRNA gene sequence. During the experimental period (72 h), the optimum temperature, pH and 3-MHE concentration for the degradation of hydride by the strain ZY3 were 35°C, 10 and 10 mg/L, respectively. The degradation rate of the sex steroid hormones increased to 87% and 85% after the addition of maltose and peptone, respectively.     

因子分析及其在河网水质综合评价中的应用研究

对因子分析方法在天然水体水质评价中的应用进行研究,证明在数据较为缺乏的情况下,使用因子分析方法可以损失较少信息,减少评价指标,针对主因子进行分析,使水质评价结果更为合理和有效。同时,利用因子的得分值还可以将不同地区进行比较分析。应用因子分析对河网地区典型河流的水质状况进行分析,发现了增长潜力较大的主要因子,并对该地区的水质状况做出了符合实际的总体评价,表明因子分析在水质评价中具有重要应用价值。     

Photocatalysis enhancement by electric field: TiO2 thin film for degradation of dye X-3B

According to the theory of photocatalysis, the efficiency of photocatalysis decreases mostly due to the recombination of photo-generated electron-hole pairs. An electric field across a photocatalyst can promote the separation of photo-generated electrons and holes and prevent them from recombination so as to enhance the efficiency of photocatalysis. And the synergetic decomposition efficiency of photocatalysis and an electric field is greater than that of the simple combine of their single efficiency. The performance of photocatalysis enhanced by electric field (PEEF) and operating conditions such as the direction of the electric field, the voltages between the two electrodes, the material of the electrodes, which may affect the efficiency of PEEF, were investigated in this paper. The results indicate that the system of PEEF abides the established theory of photocatalysis.