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排序方式: 共有138条查询结果,搜索用时 550 毫秒
81.
论述了清洁生产在环境监测中的应用,从环境监测分析中采取提高污染物分析技术,设备的使用,建立污染物处理体系及程序文件等方法,全方位的提高环境监测质量减少污染物的排放和节约成本. 相似文献
82.
The catalytic activity of Pd catalysts supported on Ce0.73Tb0.27Ox/SiO2, Ce0.6Zr0.4Ox/SiO2, Ce0.73Tb0.27Ox/La2O3-Al2O3 and Ce0.6Zr0.4Ox/La2O3-Al2O3 was studied using the reduction of NO by CO. The catalysts were characterized by X-ray fluorescence, surface area, X-ray diffraction, temperature-programmed reduction, CO chemisorption and oxygen storage capacity. Temperature-programmed reduction results indicated that Tb or Zr incorporation improves the reducibility and oxygen storage capacity. CO chemisorption data suggested the presence of large PdO particles due to the low CO/Pd ratio. No significant differences were obtained in light off temperatures (TLight off) for all Pd catalysts and the most active was 1.5%Pd/Ce0.6Zr0.4Ox/SiO2. 相似文献
83.
本研究采用盆栽试验法,研究了赤红壤、砖红壤中矿物油对水稻、花生的生理生态影响和矿物油在土壤中的净化。研究结果表明:矿物油对第一季水稻生长发育影响不大,对第二季则表现出明显的抑制作用,低浓度矿物油对花生生长发育有促进作用,高浓度则对其起抑制作用;收获后,水稻各部分及水稻土,花生根及花生土油残留均与投油量呈极显著的直线正相关关系,油在作物根部最易积累;种植两季水稻后,油在赤红壤、砖红壤中的净化率分别为80%以上和50%左右。最后,根据上述研究确定了赤红壤、砖红壤的矿物油临界含量分别为270.90mg/kg和318.92mg/kg。 相似文献
84.
85.
Takeki Maeda Juzo Matsuda Hiroshi Nakashima Koichi Yoshida Joji Suzuki 《Journal of Material Cycles and Waste Management》2000,2(2):143-149
Over a period of 21 months, we composted food refuse from a student restaurant in Hokkaido University using a commercially
available composting machine. The machine had two reactors, each with a working volume of 250 l. The refuse was mixed with
sawdust in a ratio of 5 l sawdust to 10 kg refuse, and this mixture was fed into the machine daily. We studied the characteristics
of the refuse, the composting mixture, and the finished compost in an effort to optimize the operating parameters. We also
evaluated the effectiveness of the composting process by determining the decomposition rates of the composting materials.
The optimum moisture content of the composting mixture was between 30% wet basis (wb) and 40% wb in this machine. The composting
machine worked well when the first reactor was filled with composting mixture and 0.5 kg lime was added once per week. The
mass of the materials supplied was reduced by 84% over the study period. The decomposition rate of the volatile matter in
all composting materials was 66%. The mass of the food refuse supplied was 14.8 kg/day on average, and the moisture content
of the refuse was 77% wb on average.
Received: October 4, 1999 / Accepted: April 4, 2000 相似文献
86.
87.
The New York/New Jersey Harbor (also known as the Hudson River Estuary) is heavily contaminated with polychlorinated biphenyls (PCBs) arising in part from inputs from the Upper Hudson River, which is a Superfund site containing historical PCB contamination, and also due to inputs from the New York City metropolitan area. The Contamination Assessment and Reduction Project (CARP) measured PCBs and other contaminants in ambient water samples collected throughout the Harbor region during 1998-2001. In order to investigate the sources of PCBs to the NY/NJ Harbor, this data base of PCB concentrations was analyzed using Positive Matrix Factorization (PMF). This analysis resolved seven factors that are thought to be associated with sources such as the Upper Hudson River, storm water runoff, combined sewer overflows (CSOs), and wastewater effluents. The PMF model also produced a factor that appears to be related to sites contaminated with Aroclor 1260. To the extent that the NY/NJ Harbor is typical of urbanized estuaries throughout the United States, these results suggest that storm water runoff is probably a significant source of PCBs to surface waters in urban areas. 相似文献
88.
89.
90.
Pian Feng Xiaohong Guan Yuankui Sun Wonyong Choi Hejie Qin Jianmin Wang Junlian Qiao Lina Li 《环境科学学报(英文版)》2015,27(5):175-183
Weak magnetic field(WMF) was employed to improve the removal of Cr(VI) by zero-valent iron(ZVI) for the first time. The removal rate of Cr(VI) was elevated by a factor of 1.12–5.89 due to the application of a WMF, and the WMF-induced improvement was more remarkable at higher Cr(VI) concentration and higher p H. Fe2+was not detected until Cr(VI) was exhausted, and there was a positive correlation between the WMF-induced promotion factor of Cr(VI) removal rate and that of Fe2+release rate in the absence of Cr(VI) at pH 4.0–5.5. These phenomena imply that ZVI corrosion with Fe2+release was the limiting step in the process of Cr(VI) removal. The superimposed WMF had negligible influence on the apparent activation energy of Cr(VI) removal by ZVI, indicating that WMF accelerated Cr(VI)removal by ZVI but did not change the mechanism. The passive layer formed with WMF was much more porous than without WMF, thereby facilitating mass transport. Therefore,WMF could accelerate ZVI corrosion and alleviate the detrimental effects of the passive layer, resulting in more rapid removal of Cr(VI) by ZVI. Exploiting the magnetic memory of ZVI, a two-stage process consisting of a small reactor with WMF for ZVI magnetization and a large reactor for removing contaminants by magnetized ZVI can be employed as a new method of ZVI-mediated remediation. 相似文献