共查询到20条相似文献,搜索用时 140 毫秒
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水中多环芳烃(PAHs)的去除技术研究进展 总被引:2,自引:0,他引:2
《应用化工》2016,(5):962-966
从水中多环芳烃去除技术的角度,论述了物理法、化学法和生物法的应用现状和特点。为了更好的实现对水中多环芳烃的去除,各处理方法应该加强廉价高效降解材料和处理剂,降解过程和降解机理、复合降解方法以及对处理方法影响因素和条件的控制等方面的研究。 相似文献
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《应用化工》2022,(3):597-600
聚合物的聚集行为影响着聚合物溶液性能,从而影响其应用效果。对比分析了三种不同聚集行为的聚合物流变性、黏弹性、水动力学尺寸、吸附滞留等方面性能。结果表明,聚合物的空间聚集行为越强,分子间的相互作用力越大,表现出更为明显的黏弹性能和更大的水动力学尺寸。"链束"状聚集行为的疏水改性部分水解聚丙烯酰胺(HMPAM)呈现多分子层的吸附特征,吸附量最大,能够逐步降低驱替相渗透率以改善波及效率;"团簇"状聚集行为的支化聚合物(DHAP)由于分子间强作用力而影响了其吸附层厚度,同时保留了溶液的有效应用浓度,使其在多孔介质中具备较大的水动力学尺寸和弹性性能,通过孔喉处的滞留建立更高的阻力系数(RF)和残余阻力系数(RRF),达到改善波及的目的。聚合物的聚集行为特征影响着聚合物的应用方式。 相似文献
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以菲、蒽和芘为研究对象,通过淋溶实验考察抑菌和未抑菌条件下三者在土壤中的迁移过程,结果表明,微生物的存在抑制PAHs淋出:抑菌条件下180 d时菲、蒽和芘的淋出率分别为8.74%、28.53%和13.56%,未抑菌条件下240 d时菲、蒽和芘的淋出率分别为0.95%、1.47%和0.37%。抑菌和未抑菌条件下3种PAHs均易吸附于表层土壤中:淋滤240 d时,约75%的菲分布在进水端0~2 cm;超过90%的蒽分布在进水端10 cm以内;85%的芘分布在4 cm以内;微生物通过阻滞作用和降解作用影响PAHs的迁移,菲、蒽和芘在土壤中都能被土著微生物降解;60 d以前土柱中PAHs降解以好氧降解为主,60 d以后,PAHs的生物降解转为厌氧降解。 相似文献
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大气气溶胶中多环芳烃的紫外光降解研究 总被引:1,自引:0,他引:1
以大容量空气总悬浮微粒采样器采集了大气气溶胶样品,以石英滤膜为载体,研究了气溶胶中的多环芳烃(PAHs)在紫外光照条件下的光降解规律,气溶胶中的多环芳烃在紫外光照下发生迅速的降解,其光降解反应为一级反应,光降解速率常数与它们的极谱氧化半波电位及化合物结构有关而与降解温度关系不明显。 相似文献
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B. S. Rawat K. L. Mallik I. B. Gulati 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1972,22(9):1001-1006
Six solvents have been studied by GLC for separation of 1,3-butadiene from C4-olefins having close boiling points. Infinite dilution activity coefficients and partition coefficients of five olefins have been determined in these solvents by conventional GLC-technique at 30 °C. Relative volatilities of olefins in solvents have been calculated and on this basis the solvents have been compared. 相似文献
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Y. Le Dréau P. Doumenq J. Lamontagne J. Kister G. Mille 《Polycyclic Aromatic Compounds》2013,33(1-4):111-122
Sediment samples were collected 40 months after the wreckage of the HAVEN off shore Arenzano, facing the Genoese coast, at 300 to 500 m depth, (wreckage zone) and analysed by UV fluorescence spectroscopy and CG/MS. PAHs as alkylated naphtalene, fluorene, phenanthrene, dibenzothiophene series have been studied. Analytical results reveal – 1° – a great alteration of alkylated homologues compared to parent compounds - 2° - the appearance of anthracene (absent in the original crude oil) in samples – 3° – a relative increase of high molecular weight PAHs (4–5 rings and more) as benzo(ghi)perylene and indeno(cd)pyrene. These changes result from the partial burning of the contaminant oil. A beginning of biodegradation is observed for alkylated phenanthrenes. 相似文献
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Bachan S. Rawat Indar B. Gulati Kanai Lal Mallik 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1976,26(1):247-252
Nineteen organosulphur solvents have been studied by gas chromatography as potential solvents for the extraction of aromatics. The activity coefficients of nine typical hydrocarbon solutes have been determined in these solvents at three temperatures. From the activity coefficient data, the selectivities of all the solvents have been calculated for benzene with respect to each of the other hydrocarbons in order to screen them for extraction studies. Solvent losses in the g.c. column were also studied. 相似文献