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脉冲等离子法烟气脱硫的放大实验 总被引:2,自引:0,他引:2
锅炉烟气进行脉冲等离子法脱硫的扩大实验,得到与模拟烟气实验相近的结果。研究表明,脉冲等离子法对锅炉烟气中的SO2去除率可达95%以上,烟气在反应器内的停留时间(ts)、脉冲电源的放电功率(P)和添加NH3等条件,对脱硫效率9η)有较大影响。ts、P越大、η越高。处理烟气量(Q)、能耗(P)与η存在函数关系:η=118.0(P/Q)^0.1111。烟气中加入适量NH3,对脱硫效率有显著提高,以NH3 相似文献
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研究了UV/H2O2/草酸高铁铵体系下孔雀绿(Malachite green,MG)光降解过程中的影响因素,包括MG的初始浓度、初始pH值、投加H2O2浓度和草酸高铁铵浓度等。结果表明:MG初始浓度越低光降解越快,碱性条件有利于MG的降解,其最佳降解pH为11.0;随H2O2浓度的增加,MG降解率先增加后减少,在100mmol/L时,降解率最高;MG降解率随草酸高铁铵浓度增加而增加,于10.0mmol/L时MG降解率最高;UV/H2O2/草酸高铁铵体系的降解效果较强,交叉实验结果表明H2O2:草酸高铁铵浓度比在1~20:1时降解率均高于。因此该体系具有快速、简单、经济并高效率等特点,可应用于染料废水的降解和脱色工艺中。 相似文献
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为探索长江口崇明东滩表层沉积物中是否存在厌氧氨氧化菌以及厌氧氨氧化菌的群落结构与空间分布特征,以崇明东滩高、中、低潮滩夏季表层沉积物中总DNA为模板,PCR扩增沉积物样品中厌氧氨氧化菌特异性16S rDNA片段,通过克隆、测序,构建相应基因文库,将文库中有效克隆序列分别提交到GenBank中进行相似序列搜索,并利用MEGA5绘制系统发育树.分析结果发现,克隆序列CM-L-7和CM-L-18与已发现厌氧氨氧化菌Candidatus"Scalindua sp."同源性达98%,CM-L-13与Candidatus"Scalindua wagneri"同源性达94%,CM-M-6与Candidatus"Kuenenia sp."同源性达94%,CM-M-22与Anaerobicammonium-oxidizing planctomycete JMK-1的同源性达95%,CM-H-15与Candidatus"Kuenenia stuttgartiensis"的同源性达94%.表明,崇明东滩高、中、低潮滩表层沉积物中均存在厌氧氨氧化菌,但所属菌属不同,低潮滩以Candidatus"Scalindua"为主,中、高潮滩以Candidatus"Kuenenia"为主.相比之下,中潮滩厌氧氨氧化菌群落结构较为复杂.部分克隆序列与已发现厌氧氨氧化菌存在较大进化距离,表明崇明东滩可能还存在其他具有潜在厌氧氨氧化功能的细菌. 相似文献
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采用分光光度法和离子色谱法测定降水中铵离子,比对研究两种方法的测定原理、标准曲线和检出限。结果表明,两种方法对标准样品和实际样品分析测定均能达到质控要求,测定结果基本一致。离子色谱法方便快捷,污染少,结果准确可靠,可以同时测定多种阳离子。 相似文献
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Ishaq Ahmad Mian Muhammad Riaz Malcolm S. Cresser 《Environmental pollution (Barking, Essex : 1987)》2009,157(4):1287-1293
The physico-chemical absorption characteristics of ammonium-N for 10 soils from 5 profiles in York, UK, show its high potential mobility in N deposition-impacted, unfertilized, permanent grassland soils. Substantial proportions of ammonium-N inputs were retained in the solution phase, indicating that ammonium translocation plays an important role in the N cycling in, and losses from, such soils. This conclusion was further supported by measuring the ammonium-N leaching from intact plant/soil microcosms. The ammonium-N absorption characteristics apparently varied with soil pH, depth and soil texture. It was concluded for the most acid soils especially that ammonium-N leached from litter horizons could be seriously limiting the capacity of underlying soils to retain ammonium. Contrary to common opinion, more attention therefore needs to be paid to ammonium leaching and its potential role in biogeochemical N cycling in semi-natural soil systems subject to atmospheric pollution. 相似文献
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JITENDRA SINGH DILEEP K. SINGH 《Journal of environmental science and health. Part. B》2013,48(8):1305-1318
Impacts of diazinon (O,O-diethyl O-2-isopropyl-6-methylpyrimidin-4-yl phosphorothioate), imidacloprid [1-(6-chloro-3-pyridylmethyl)-N-nitroimidazolidin-2-ylideneamine] and lindane (1,2,3,4,5.6-hexachlorocyclohexane) treatments on ammonium, nitrate, and nitrite nitrogen and nitrate reductase enzyme activities were determined in groundnut (Arachis hypogaea L.) field for three consecutive years (1997 to 1999). Diazinon was applied for both seed- and soil-treatments but imidacloprid and lindane were used for seed treatments only at recommended rates. Diazinon residues persisted for 60 days in both the cases. Average half-lives (t1/2) of diazinon were found 29.3 and 34.8 days respectively in seed and soil treatments. In diazinon seed treatment, NH4 +, NO3 ?, and NO2 ? nitrogen and nitrate reductase activity were not affected. Whereas, diazinon soil treatment indicated significant increase in NH4 +-N in a 1-day sample, which continued until 90 days. Some declines in NO3 ?N were found from 15 to 60 days. Along with this decline, significant increases in NO2 ?N and nitrate reductase activity were found between 1 and 30 days. Imidacloprid and lindane persisted for 90 and 120 days with average half-lives (t1/2) of 40.9 and 53.3 days, respectively. Within 90 days, imidacloprid residues lost by 73.17% to 82.49% while such losses for lindane residues were found 78.19% to 79.86 % within 120 days. In imidacloprid seed-treated field, stimulation of NO3 ?N and the decline in NH4 +NO2 ?-N and nitrate reductase enzyme activity were observed between 15 to 90 days. However, lindane seed treatment indicated significant increases in NH4 +-N, NO2 ?-N and nitrate reductase activity and some adverse effects on NO3 ?N between 15 and 90 days. 相似文献
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A study has examined the effect of urea on the thermal stability and detonation characteristics of ammonium nitrate (AN). The thermal decomposition temperature and surface morphology of samples were investigated by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). For further research on the thermal sensitivity and shock sensitivity of the samples, the Koenen test and UN gap test were conducted. The results indicate that urea can substantially increase the thermal stability of AN (the greatest exothermic peak is increased by more than 100 °C) and reduce the thermal sensitivity of AN. However, AN-50wt. % urea mixtures can still produce a steady detonation in the UN gap test. Urea cannot reduce the ability to propagate a detonation. Possible explanations for these results are discussed. 相似文献