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排序方式: 共有1056条查询结果,搜索用时 15 毫秒
1.
氢氟酸的污染与防治 总被引:1,自引:0,他引:1
方慧萍 《石油化工环境保护》1997,(1):52-54
综述氢氟酸烷基化装置,运行过程中氢氟酸的危害,污染源的分析,防治措施及取得效果. 相似文献
2.
The typical parameters of acid precipitation are evaluated in the forest of Vallombrosa (Tuscan Appennines) during the dry period 1988-89. Individual rain events (dry and wet deposition) were sampled in a clearing of the forest and below the canopy of an evergreen tree as well as a deciduous broadleaf tree.
In atmospheric precipitation the pH values usually vary around 4.4, with neutralization in the hot season due to calcareous material from distant sources. Relatively large concentrations of Pb and Cd are found in rain, but only in a small amount in canopy leachate. Aluminium, manganese and iron are more significantly washed off than Pb and Cd. 相似文献
In atmospheric precipitation the pH values usually vary around 4.4, with neutralization in the hot season due to calcareous material from distant sources. Relatively large concentrations of Pb and Cd are found in rain, but only in a small amount in canopy leachate. Aluminium, manganese and iron are more significantly washed off than Pb and Cd. 相似文献
3.
Xin Xing Na Li Jie Cheng Yonggang Sun Zhongshen Zhang Xin Zhang Zhengping Hao 《环境科学学报(英文版)》2020,32(10):55-63
In this work, a series of Cu-ZSM-5 catalysts with different SiO2/Al2O3 ratios (25, 50, 100 and 200) were synthesized and investigated in n-butylamine catalytic degradation. The n-butylamine can be completely catalytic degradation at 350°C over all Cu-ZSM-5 catalysts. Moreover, Cu-ZSM-5 (25) exhibited the highest selectivity to N2, exceeding 90% at 350°C. These samples were investigated in detail by several characterizations to illuminate the dependence of the catalytic performance on redox properties, Cu species, and acidity. The characterization results proved that the redox properties and chemisorption oxygen primarily affect n-butylamine conversion. N2 selectivity was impacted by the Brønsted acidity and the isolated Cu2+ species. Meanwhile, the surface acid sites over Cu-ZSM-5 catalysts could influence the formation of Cu species. Furthermore, in situ diffuse reflectance infrared Fourier transform spectra was adopted to explore the reaction mechanism. The Cu-ZSM-5 catalysts are the most prospective catalysts for nitrogen-containing volatile organic compounds removal, and the results in this study could provide new insights into catalysts design for VOC catalytic oxidation. 相似文献
4.
Fractionation of Cu, Pb and Zn in certified reference soils SRM 2710 and SRM 2711 using the optimized BCR sequential extraction procedure 总被引:4,自引:0,他引:4
Sequential extraction of metals from solid media is a common analytical tool used in environmental and exploration geochemistry. A number of procedures exist, but without harmonization and standardization, meaningful comparisons are tenuous without baseline data. A newly developed, standardized sequential extraction procedure (optimized BCR) was applied to two contaminated certified reference soils from Montana, US (SRM 2710 and SRM 2711) for Cu, Pb and Zn. Four operationally defined fractions were isolated, acid extractable, reducible, oxidizable, and residual (by aqua regia). Fraction-specific concentrations, percentages and recoveries for Cu, Pb and Zn were used to explore differences between the optimized BCR procedure and three other sequential extraction schemes with published data for SRM 2710 and 2711 (i.e. Tessier scheme, Geological Survey of Canada scheme and the original BCR scheme). Results indicate significant differences between the four schemes, even for schemes that are closely associated (i.e. the original and optimized BCR schemes). Order-of-magnitude fraction-specific concentration differences were observed, especially for Pb in the reducible fraction. Differences between schemes are worrisome because trends varied between metals, between fractions and between reference soils. These data reinforce the need for increased adoption of standardized sequential extraction procedures and further examination of different solid media. 相似文献
5.
6.
废干电池中锌和汞的分布及其处理 总被引:1,自引:0,他引:1
由于民众缺乏环境意识和国家没有相应法规 ,大多数废干电池都随手丢弃 ,回收的废电池处于不同程度的腐蚀状态。介绍了锌、汞在废干电池中的分布状态以及腐蚀对其分布的影响 ,并根据它们的分布特点提出用真空法回收废干电池中的锌、汞。 相似文献
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8.
介绍寒冷地区小型硫磺回收的设计特点,包括选用一、二、三级冷凝器同壳、低噪音鼓风机;试生产中的改进经验,包括过程气用蒸汽夹套保温,带有硫封的被硫储罐. 相似文献
9.
以凹凸棒土为原料,通过复配造粒、热处理的方法对凹凸棒土进行改性,并用改性后的凹凸棒土对染料废水进行处理。考察了pH值、凹凸棒土用量及吸附时间等因素的影响,探索了最佳工艺条件。结果表明,改性后的凹凸棒土吸附性能有了明显改善,对染料废水进行处理,脱色率可达99%以上,处理废水量与吸附剂比为670颐1,且其原料价廉易得、工艺简单、成本低,是一种较好的脱色吸附剂。 相似文献
10.
多种染料的微生物脱色研究 总被引:20,自引:2,他引:20
从印染、毛纺等废水处理场的生物膜和活性污泥中分离到13株对36种染料有脱色能力的细菌。其中三株转化单胞菌D_(32),D_(33),D_4分别对29种染料有良好的脱色作用,其完整细胞对单一染料的脱色活力达2.6mg·g~(-1)(细胞湿重)·h~(-1)。对脱色反应的条件和机理进行了初探。 相似文献