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排序方式: 共有197条查询结果,搜索用时 62 毫秒
181.
通过深入研究常见化学品在不同物料输送泵输送过程中的污染物排放规律,模拟实际生产过程中物料输送的形式,设计并搭建了系数测定试验装置,探索并选择甲苯、二甲苯、甲醇和盐酸在该试验装置中的取样、计量和监测方法。经过长期的现场实测,形成了4种常见化学品在典型的5种类型的泵输送过程中的污染物排放系数。根据试验结果,计算总结得知,在三类釜前泵输送过程中,污染物排放系数从小到大排序为二甲苯、盐酸、甲苯、甲醇;在两类真空泵输送过程中,污染物排放系数从小到大排序为二甲苯、甲苯、盐酸、甲醇。 相似文献
182.
Huan?YuEmail author Zheng-Wei?He Bo?Kong Zhong-Yin?Weng Ze-Ming?Shi 《Environmental geochemistry and health》2016,38(2):381-398
The development and formation of chemical elements in soil are affected not only by parent material, climate, biology, and topology factors, but also by human activities. As the main elements supporting life on earth system, the C, N, P, S cycles in soil have been altered by human activity through land-use change, agricultural intensification, and use of fossil fuels. The present study attempts to analyze whether and how a connection can be made between macroscopical control and microcosmic analysis, to estimate the impacts of human activities on C, N, P, S elements in soil, and to determine a way to describe the spatial relationship between C, N, P, S in soil and human activities, by means of landscape geochemical theories and methods. In addition, the disturbances of human activities on C, N, P, S are explored through the analysis of the spatial relationship between human disturbed landscapes and element anomalies, thereby determining the diversified rules of the effects. The study results show that the rules of different landscapes influencing C, N, P, S elements are diversified, and that the C element is closely related to city landscapes; furthermore, the elements N, P, and S are shown to be closely related to river landscapes; the relationships between mine landscapes and the elements C, N, P, S are apparent; the relationships between the elements C, N, P, S and road landscapes are quite close, which shows that road landscapes have significant effects on these elements. Therefore, the conclusion is drawn that the response mechanism analysis of human disturbance and soil chemical element aggregation is feasible, based on the landscape geochemical theories and methods. The spatial information techniques, such as remote sensing and geographic information systems, are effective for research on soil element migration. 相似文献
183.
Land use change analysis in the Zhujiang Delta of China using satellite remote sensing,GIS and stochastic modelling 总被引:10,自引:0,他引:10
Weng Q 《Journal of environmental management》2002,64(3):273-284
Rapid land use change has taken place in many coastal regions of China such as the Zhujiang Delta over the past two decades due to accelerated industrialization and urbanization. In this paper, land use change dynamics were investigated by the combined use of satellite remote sensing, geographic information systems (GIS), and stochastic modelling technologies. The results indicated that there has been a notable and uneven urban growth and a tremendous loss in cropland between 1989 and 1997. The land use change process has shown no sign of becoming stable. The study demonstrates that the integration of satellite remote sensing and GIS was an effective approach for analyzing the direction, rate, and spatial pattern of land use change. The further integration of these two technologies with Markov modelling was found to be beneficial in describing and analyzing land use change process. 相似文献
184.
通过观测和研究 ,得出风沙区农田防护林带的走向与主风方向的交角 ,不能小于 45° ,主林带间距 15 0m——— 2 0 0m ,副林带间距 2 3 0m——— 70 0m ,林带结构以疏透结构为最好 ,主林带一般由主林木 5— 6行组成 ,副林带由 2— 3行组成 ,再在迎风面和背风面配置 1行— 2行灌木和针叶树 相似文献
185.
Supported transition-metal oxide catalysts for reduction of sulfur dioxide with hydrogen to elemental sulfur 总被引:4,自引:0,他引:4
This work is for the purpose to find a high performance catalyst for the catalytic reduction of SO2 with H2 as a reducing agent. NiO/gamma-Al2O3 catalyst was found to be the most active catalyst among the seven gamma-Al2O3-supported metal-oxide catalysts tested. With NiO as the active species, of the supports tested, gamma-Al2O3 was the most suitable one and the optimal Ni content was 16 wt%. Using this NiO/gamma-Al2O3 catalyst, we found that the optimal feed ratio of H2/SO2 is 2:1 and the catalyst presulfided with H2 + H2S exhibits a higher performance than that pretreated with H2 or He. XRD patterns reveal that the nickel oxide experienced a transformation to Ni3S2 and NiS, and then to NiS2, the most active nickel sulfide, during the reaction process. The reason for the highest catalyst activity of 16 wt% Ni was attributed to the largest amount of NiS2. Water vapor in the feed gas reactant caused inhibition of catalyst activity, whereas H2S promoted the reduction of SO2. These phenomena were rationalized with the aid of Claus reaction. 相似文献
186.
La(1-x)Sr(x)FeO(3) (x=0.0-1.0) perovskites were prepared and tested for the combustion of methane. X-ray diffraction (XRD) patterns revealed the presence of a single perovskite structure for substitutions 0x0.3, however Fe(2)O(3), SrCO(3) and SrFeO(3) phases were observed for substitutions x>0.3. The results of activity test indicate that with La(1-x)Sr(x)FeO(3) as the catalyst, the combustion of methane can take place at low temperatures around 400 degrees C. Partial substitution of La with Sr increases the activity and an optimal substitution fraction (x=0.5) exists in the La(1-x)Sr(x)FeO(3) catalysts. Catalyst activity can be well correlated to the product of the specific surface area and atomic ratio of Fe to La+Sr on the catalyst surface. Experimental results of O(2)-TPD and CH(4)-TPD in the range of 350-500 degrees C indicate that the amount of oxygen desorbed from the La(1-x)Sr(x)FeO(3) catalysts is far larger than that of methane. Therefore, it can be proposed that the catalytic oxidation of CH(4) over these catalysts proceeds with the surface reaction between CH(4) in the gas phase and the adsorbed O(2). Addition of water vapor or CO(2) to the feed inhibited catalyst activity, but the inhibition was reversible and became negligible at high reaction temperature. 相似文献
187.
188.
Yongxin Zhang Yanping Yang Yue Gong Ying Wang Xuecheng Wu Zhiying Zhou Weiguo Weng 《环境科学学报(英文版)》2023,123(1):212-221
Vessel emissions have contributed a great deal to air quality deterioration in China. Hence,the Chinese government has promulgated a series of stringent emission regulations. It is in this context that vessel emission control technology research is in full swing. In particular,during the 13th Five-Year Plan, the air pollution control technology of vessels has greatly improved. Vessel emission control has followed two main governance routes: source emission reduction and aftertreatment technology... 相似文献
189.
190.
Xue Xiaoxiao Weng Yujing Yang Shicheng Meng Shihang Zhang Zhengting Yi Guiyun Zhang Yulong 《Environmental science and pollution research international》2021,28(13):15883-15889
Environmental Science and Pollution Research - Using copper nitrate trihydrate as the copper source, TiO2@Cu-MOF nanocomposites were prepared by a one-step crystallization method, and the effect of... 相似文献