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121.
活性污泥PVA膜状固定及净化污水效率 总被引:2,自引:0,他引:2
PVA膜状固定细胞是一种新细胞固定化方法。在加入少量藻酸钙盐的条件下 ,用硼酸交联聚乙烯醇 ( PVA) ,活性污泥培养物渗于其内 ,将其涂于载体上被固定成膜。细胞经固定后仍保持活力 ,PVA—藻酸钙盐珠非常结实耐用。 相似文献
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A new coal pillars design method in order to enhance safety of the retreat mining in room and pillar mines 总被引:1,自引:0,他引:1
Most of the proposed methods for coal pillar design determine pillar dimensions using pillar load estimation only through the tributary area theory. Designing pillar based on these methods is not appropriate in room and pillar mines with pillar recovery because retreat mining and gob creation generate abutment loads. Neglecting abutment loads in design stage may lead to pillar failure and destructive effects during retreat mining. Thus proper pillar design has a remarkable effect on mining safety. In this paper, a step-by-step method is presented to design pillars with square shape in room and pillar mines with regard to existing pillars in the active mining zone (AMZ) and estimating abutment loads according to experimental equations. A decrease in pillar failure risk during retreat mining is the most significant benefit of this method. This method has been applied to determine optimum pillar dimensions in the main panel of Tabas Central Mine (TCM), located in the mid-eastern part of Iran. Obtained results show the abutment loads account for 27% of the total loads applied on pillars in AMZ in this panel. Pillar width, based on this method, is also obtained 11.6 m. 相似文献
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变光焊接护目镜光电响应特性研究 总被引:2,自引:1,他引:1
为促进变光焊接护目镜新技术新产品的应用和发展 ,为制定该产品专业标准提供依据 ,通过对焊接弧光特性、可见光特性、焊工盲目引弧过程、焊工闪光盲、变光护目镜响应时间和保持时间等的分析和研究 ,提出了变光焊接护目镜响应时间和保持时间应该根据焊工引弧时眼睛最大允许照射量和允许闪光盲时间来确定 ,并进一步提出了变光焊接护目镜响应时间和保持时间的定义、指标值 ,以及测试系统设计要求 相似文献
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基于紫外辐照/硼氢化钾/亚硫酸氢钠(UV/KBH4/NaHSO)3体系下对活性艳红X-3B进行还原脱色反应,重点探讨了该体系下还原降解活性艳红X-3B的反应机理,考察了硼氢化钾和亚硫酸氢钠的摩尔比(B/S)、辐射光强对其反应机理的影响。结果发现,UV/KBH4/NaHSO3处理染液具有明显协同作用,初步推测光助硼氢化钾和亚硫酸氢钠还原活性艳红X-3B的脱色反应是SO2-参与的自由基反应;脱色反应的B/S最佳摩尔比为1:30;增加辐射光的强度对染液的还原脱色反应过程具有明显的促进作用。 相似文献
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Series of Fe/Cu-SSZ-13 catalysts with different Fe loading content were synthesized by simple one-pot strategy. The obtained catalysts were subjected to selective catalytic reduction (SCR) of NOx with NH3 and were characterized by various techniques. The results show that Fe0.63/Cu1.50-SSZ-13 catalyst with proper Fe content exhibits excellent catalytic activity with widest operation temperature window from 160 to 580°C, excellent hydrothermal stability as well as good resistance to sulfur poisoning when compared with Cu-SSZ-13, signifying its great potential for practical applications. Further characterizations reveal that the synthesized Fe/Cu-SSZ-13 catalysts present typical chabazite (CHA) structure with good crystallinity, while isolated Cu2+ and monomeric Fe3+ are revealed as the predominant copper and iron species. At low temperatures, isolated Cu2+ species act as primary active sites for SCR reaction, while monomeric Fe3+ species provide sufficient active sites for sustain the SCR activity at high temperature. Moreover, Fe over doping would lead to the damage of zeolite structure, destruction of isolated Cu2+ site, as well as the formation of highly oxidizing Fe2O3, thus causing deterioration of catalytic performances. 相似文献
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Active moss biomonitoring of trace elements with Sphagnum girgensohnii moss bags in relation to atmospheric bulk deposition in Belgrade, Serbia 总被引:1,自引:0,他引:1
Anicić M Tasić M Frontasyeva MV Tomasević M Rajsić S Mijić Z Popović A 《Environmental pollution (Barking, Essex : 1987)》2009,157(2):673-679
Active biomonitoring with wet and dry moss bags was used to examine trace element atmospheric deposition in the urban area of Belgrade. The element accumulation capability of Sphagnum girgensohnii Russow was tested in relation to atmospheric bulk deposition. Moss bags were mounted for five 3-month periods (July 2005-October 2006) at three representative urban sites. For the same period monthly bulk atmospheric deposition samples were collected. The concentrations of Al, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Cd, and Pb were determined by instrumental neutron activation analyses and atomic absorption spectrometry. Significant accumulation of most elements occurred in the exposed moss bags compared with the initial moss content. High correlations between the elements in moss and bulk deposits were found for V, Cu, As, and Ni. The enrichment factors of the elements for both types of monitor followed the same pattern at the corresponding sites. 相似文献