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1.
The purpose of this work was to study the distribution of airborne particles in the surroundings of an iron and steel factory in southern Finland. Several sources of particulate emissions are lying side by side, causing heavy dust loading to the environment. This complicated multi-pollutant situation was studied mainly by SEM/EDX methodology.Particles accumulated on Scots pine bark were identified andquantitatively measured according to their element content,size and shape. As a result, distribution maps of particulateelements were drawn and the amount of different particle typesalong the study lines was plotted. Particulate emissions fromthe industrial or energy production processes were not themain dust source. Most emissions were produced from theclinker crusher. Numerous stockpiles of the industrial wastesand raw materials also gave rise to particulate emissions as aresult of wind erosion. It was concluded that SEM/EDXmethodology is a useful tool for studying the distribution ofparticulate pollutants. 相似文献
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Fan Jinhong Xu Wenying Gao Tingyao Ma Luming 《Frontiers of Environmental Science & Engineering in China》2007,1(4):504-508
Iron and copper bimetallic system (catalyzed Fe-Cu process) is a promising technology for alkaline nitrobenzene-containing
wastewater treatment. However, little is currently known about the changes of treatment efficiency with time going. This research
investigated the long-term performance of the catalyzed Fe-Cu process to reduce nitrobenzene (NB) in alkaline wastewater.
In addition, the changes of the metal surfaces morphologies and matters before and after the reaction were analyzed by scanning
electron microscopy (SEM) in conjunction with energy-dispersion spectroscopy (EDS) and X-ray diffraction spectroscopy (XRD).
The results showed that the surface properties of copper almost remained unchanged after weeks of operation, which spelled
its strong chemical stability and resistance to poisoning. Moreover, the results indicated that there were two reasons for
the treatment efficiency decreasing with time. One was the gradual iron element consumption due to corrosion. The other was
iron reactivity weakened due to the precipitates accumulation on the surfaces that were mainly Fe3O4 and FeCO.
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Translated from Environmental Pollution & Control, 2006, 28(10): 783–785 [译自: 环境污染与防治] 相似文献
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为了研究优化后的甘蔗皮渣吸附居室中的甲醛,本研究通过3种方法处理材料进行吸附甲醛对比,得出简便高效的碱热烫处理,并针对其热烫时间(X1)、pH值(X2)、水浴锅温度(X3)和水浴时间(X4)设置正交实验,得出热烫时间30 min、pH=11、水浴锅温度80℃、水浴时间2.5 h,甘蔗皮渣对甲醛吸附率可达27.91%。通过与活性炭、硅藻纯吸附效果比较,经F检验得出优化处理甘蔗皮渣与硅藻纯吸附效果相当,均极显著优于活性炭。电镜观测出优化甘蔗皮渣与活性炭、硅藻纯同具粗糙、皱褶、疏松多孔结构;傅里叶红外光谱分析出C≡C等基团在甲醛吸附中起主要作用。 相似文献
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Xiaoli Wang 《中国人口.资源与环境(英文版)》2017,15(1):80-86
As the main contribution of China’s carbon emissions, low-carbon production in industrial firms becomes an inevitable choice, and industrial firm employees’ attitudes on low-carbon new technology directly influence the results of low-carbon production. Based on the Unified Theory of Acceptance and Use of Technology model, structural equation modeling was used to analyze the main factors influencing firm staff to accept low-carbon new technology. The study reveals that the employee’s social impact, performance expectation, effort expectations and convenient conditions, and employee characteristics are all main factors affecting their acceptance attitudes on low-carbon new technology. And social influence has the largest effect on employees’ acceptance attitudes toward low-carbon new technology. Accordingly, relevant policy recommendations are put forward for the future research direction. 相似文献
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城市污染河道沉积物AVS与重金属生物毒性研究 总被引:3,自引:2,他引:1
采集珠江三角洲典型城市污染河道佛山水道表层沉积物和上覆水样品,测定了沉积物AVS,Eh,SEMPb,SEMCd,SEMCu,SEMZn,SEMNi,SEMCr,及上覆水Eh,DO.同步进行了底栖动物调查,结合调查结果分析了城市污染河道沉积物AVS与重金属生物毒性的关系.主要研究SEM-AVS判据在判断城市重污染河道重金属生物有效性方面的作用.所测AVS最大值为69.579 μmol/g,最小值为0.339 μmol/g,均值为20.283 μmol/g;各采样站位∑SEM5(SEMPb,SEMCd,SEMCu,SEMZn,SEMNi之和)最大值为23.067 μmol/g,最小值为1.062 μmol/g;底栖动物种类和数量均较少,且基本为耐污种,优势种为水丝蚓.13个采样站位中,∑SEM5-AVS<0的有9个,MDS分析结果显示:这9个站位中的7个底栖动物群落结构相似程度高.这表明重污染河道沉积物重金属的生物毒性与SEM-AVS的值关系密切,SEM-AVS判据在判断重污染区域重金属的生物毒性方面具有较大作用;同时说明重污染河流重金属生物毒性比较复杂,不能完全由SEM-AVS解释. 相似文献
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