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561.
Qiang Tang Qin Wang Pengfei Cui Weiwei Cao Shifeng Hou 《Process Safety and Environmental Protection》2013,91(5):386-390
A new process of flue gas desulfurization in circulating fluidized bed with flue gas bypass ducts is presented. k–? Model, Discrete Phase Model and Finite-Rate Chemistry Model are proposed to simulate the desulfurization process characteristics in circulating fluidized bed reactor. The proposed model is validated by the comparison of experimental data and simulation results. The results show that the desulfurization reactor with bypass ducts is superior to the reactor without bypass ducts. The reactor with bypass ducts has higher desulfurization efficiencies and lower flow resistances than the reactor without bypass ducts, and it is more suitable for flue gas flow variation. Desulfurization reaction rate is controlled by absorption reaction on sorbent particles surface. When water content and Ca/S ratio increase, desulfurization efficiency of the reactor with bypass ducts increases. When SO2 concentration increases, desulfurization efficiency decreases. 相似文献
562.
Kun Lv Lu Bai Boyu Song Xindong M Minmin Hou Jie Fu Yali Shi Yawei Wang Guibin Jiang 《环境科学学报(英文版)》2022,34(5):277-285
The production and application of organophosphate esters (OPEs) have dramatically increased in recent years due to their use as a replacement for brominated flame retardants. In this study, 13 OPEs (Σ13OPEs) were analyzed in indoor air samples from kitchens and living rooms in 14 residential homes in Beijing, China. The concentrations of Σ13OPEs in kitchen air samples (mean: 13 ng/m3) were significantly (p < 0.05) higher than in living room air samples (5.0 ng/m3). In addition, paired window surface organic film samples were collected and analyzed to investigate film-air partitioning, exhibiting a mean concentration of Σ13OPEs of 4100 ng/m2. The congener profiles showed that tris(2-chloroisopropyl) phosphate (TCPP) was the predominant compound in both window film samples (48%) and the corresponding indoor air sample (56%). The estimated daily intakes (EDI) of OPEs via indoor air inhalation were 2.8 and 1.4 ng/kg/day for infants and adults, respectively, both of which are below the reference dose values (RfDs). Overall, these findings indicate that OPEs in the indoor air environment of residential homes in Beijing are not likely to pose a health risk to the general population. 相似文献
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565.
Evaluation system can encourage and guide entrepreneurs, and impel them to perform well in environment management. An evaluation method based on advantage structure is established. It is used to analyze entrepreneur environment management behavior in China. Entrepreneur environment management behavior evaluation index system is constructed based on empirical research. Evaluation method of entrepreneurs is put forward, from the point of objective programming-theory to alert entrepreneurs concerned to think much of it, which means to take minimized objective function as comprehensive evaluation result and identify disadvantage structure pattern. Application research shows that overall behavior of Chinese entrepreneurs environmental management are good, specially, environment strategic behavior are best, environmental management behavior are second, cultural behavior ranks last. Application results show the efficiency and feasibility of this method. 相似文献
566.
通辽市环境保护监测站从2011年开始降水12项监测。本文根据2011年全年降水监测数据分析通辽市空气环境质量状况及存在的问题,探讨空气环境质量与土壤和水质环境质量的综合效应。 相似文献
567.
自然灾害造成的损失与应急管理的有效性和及时性成反比,而应急管理的有效性和及时性与当前国家的自然灾害领域研究水平以及国家的灾害应急管理体制分不开。对此,本文在简要归纳自然灾害的概念、特点与危害的基础上,阐述了自然灾害应急管理的重要意义。然后,从宏观及微观两个层面对自然灾害应急管理研究成果予以评述,并指出现有研究中存在的不足,进而从社会系统、生态系统和经济系统三个方面展望了自然灾害应急管理未来研究的重点和方向,这对于完善我国自然灾害应急管理研究体系,提升我国自然灾害应急管理水平具有重要的意义。 相似文献
568.
对华北、西北和南方等地的30余所变电站产生的生活污水的处理及排放情况进行了调研,汇总分析了我国目前变电站主要的污水处理方法、排放方式及其存在的主要问题,并针对各地区的特点提出了相应的解决方案。 相似文献
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570.
Examining the technology acceptance for dismantling of waste printed circuit boards in light of recycling and environmental concerns 总被引:2,自引:0,他引:2
The dismantling of printed circuit board assemblies (PCBAs) and the recovery of their useful materials can lead to serious environmental impacts mainly due to their complicated physical structure and the variety of toxic elements contained in their material composition. So far, less attention has been paid to their responsible recycling compared to that of bare printed circuit boards. Combined with other materials recovery process, proper dismantling of PCBAs is beneficial to conserve scarce resources, reuse the components, and eliminate or safely dispose of hazardous materials. In analyzing the generation, resources potential and hazardous risk of scrap PCBAs, technologies used for the dismantling of waste PCBAs have been widely investigated and reviewed from the aspects of both industrial application and laboratory-scale studies. In addition, the feasibility of PCBA dismantling has been discussed, the determinants of which, including the heating conditions and mechanical properties have been identified. Moreover, this paper evaluates the environmental consequences caused by the dismantling of PCBAs. 相似文献