共查询到20条相似文献,搜索用时 359 毫秒
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钢铁行业是无意排放持久性有机污染物(POPs)的主要污染源,为切实履行《关于持久性有机污染物的斯德哥尔摩公约》,加快行业POPs控制技术推广应用,通过文献调研、企业考察、专家访谈等,对钢铁行业主要POPs控制技术的应用状况及扩散途径进行了研究。探讨POPs控制技术扩散的主要影响因素,包括政策标准变化以及市场竞争压力等驱动因素,以及相关环境管理和资金保障缺乏、技术不完善等障碍因素。提出了行业POPs控制技术扩散的保障机制,包括环境管理、技术支撑和资金支持机制。 相似文献
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持久性有机污染物分析和处理技术研究进展 总被引:3,自引:0,他引:3
阐述了持久性有机污染物 (POPs)的特性、POPs对人体健康和生态环境的危害及其判定基准 ,综述了其分析和研究方法及治理技术 ,归纳了POPs的研究内容。 相似文献
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持久性有机污染物分析和处理技术研究进展 总被引:22,自引:0,他引:22
阐述了持久性有机污染物(POPs)的特性、POPs对人体健康和生态环境的危害及其判定基准,综述了其分析和研究方法及治理技术,归纳了POPs的研究内容。 相似文献
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西安市城区持久性有机污染物的干湿沉降 总被引:1,自引:0,他引:1
《环境工程学报》2016,(3)
为了确定大气干湿沉降中持久性有机污染物的主要特征及干、湿沉降对大气中污染物去除的相对贡献,选择西安市城区为研究对象,于2014年4—10月在东、西、南、北各区域的一环路和二环路均设采样点,共采集了302个大气干、湿沉降样品。降雨样品经过液液萃取,降尘样品经过超声萃取,使用气相色谱法测定了36种POPs的含量,仅PCB157未检出。结果表明,干、湿沉降样品POPs沉降通量分别为458.78 kg/a和1846.90 kg/a,其中的多环芳烃(PAHs)、多氯联苯(PCBs)和有机氯农药(OCPs)分别占总量的47%~77%、16%~42%和5%~12%。就POPs的空间分布而言,南郊北郊东郊西郊,大气中POPs主要由燃油污染贡献。就POPs的存在特征而言,降雨降尘径流,湿沉降是大气环境中POPs的主要排除方式。经SPSS分析晴天数、TOC与POPs的相关性得到r0.7,因此晴天数和TOC是大气中POPs干湿沉降的主要影响因素。 相似文献
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试样的采集贮运与提取浓缩是环境有机分析工作中的首要环节.这些步骤的成败直接关系和影响着分析结果,因此必须给以足够的重视.环境有机分析从学科上来说,作为痕量分析的一支,有不少课题在国内外都是新的前沿性的工作,其原因是环境样品对象广泛,有机污染物尤其组成复杂、异构体 相似文献
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Alfred Eisner Jacob Tadmor 《Journal of the Air & Waste Management Association (1995)》2013,63(4):400-401
A number of key projects in the Environmental Protection Agency (EPA) particulate R&;D program having applicability to industry are presented. For electrostatic precipitators (ESP) there is presented the result of work on large diameter discharge electrodes which provide a decrease in penetration of up to a factor of 4 when compared to conventional small diameter electrodes. Also discussed is the multistage ESP which provides a collection efficiency that would require a collecting plate area 4 or 5 times larger with conventional ESP technology. The E-SOX technology makes use of the multistage concept to free up space in the ESP for SO2 removals of up to 90%. Electrostatically augmented fabric filtration provides a reduction in pressure drop of about 5 0% as compared to conventional fabric filtration. Wind tunnel modeling of windbreaks for material storage piles indicates a potential for providing engineering design data that would allow significant emission reduction caused by wind erosion 相似文献
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《国际环境与污染杂志》2011,10(2):304-314
This paper investigates some of the reflectivity characteristics that clouds (when modelled as solid bodies) must exhibit to be compatible with observations that the reflecting surface of a cloud (i) appears almost equally bright across its face, (ii) is brightest when the cloud is opposite to the Sun but decreases in brightness as the cloud moves to other positions and (iii) increases in brightness with increasing optical thickness of the cloud in the observer's line of sight. These observations, respectively, are shown to imply that the peak value of the bidirectional total reflectivity from a cloud surface (i) increases in inverse proportion to the cosine of the angle between the Sun and the normal to the cloud surface, as the incident angle increases, (ii) appears to be directed back in the direction of the incident radiation, and (iii) increases as optical thickness of the cloud in the observer's line of sight increases. The results could have application in many fields (e.g. modelling diffuse radiance distributions for cloudy skies). 相似文献
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Árpád Ambrus 《Journal of environmental science and health. Part. B》2013,48(3):435-442
Abstract A computer model was used to take random samples from primary sample populations obtained from field trials to simulate the uncertainty of sampling for residue analysis of plant commodities and soil. The results indicate about 40%, 30% and 20% relative uncertainty when random samples of size 5, 10 and 25 are taken respectively, from a single lot. Therefore the sample size should be the same for establishing and enforcing legal limits. 相似文献
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结合扬中生态环境的基本情况和存在的不足,进行了具体分析,对扬中未来生态建设的发展方向提出了建议及实施措施。 相似文献
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在实施ISO/IEC17025:1999标准《检测和校准实验室能力的通用要求》过程中,通过实验室质量管理体系内部审核的实践与系统分析,识别出内部审核实施阶段的关键环节,提出召开首次会议、收集审核证据、确定审核发现和召开末次会议的技术方法,对提高内部审核的质量和有效性、获得可靠的审核结论具有重要意义。 相似文献
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介绍了电解法生产次氯酸钠的原理 ,并在原有生产工艺的基础上进行了重新设计和对设备的重新选择、改造 ,得出了各个工艺参数的最佳值 ,生产出高品质的次氯酸钠 相似文献
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Janusz A. Pudykiewicz Anna S. Koziol 《Atmospheric environment (Oxford, England : 1994)》1998,32(24):5541
The most common technique used for numerical simulations of tracer mixing is that of the numerical solution of the advection–diffusion equation with the unresolved fluxes parameterized using the similarity theory. Despite correct predictions of the overall directions of transport, models based on a numerical solution of the advection–diffusion equation lack sufficient accuracy to correctly reproduce the coupling of mixing with small scale processes which are sensitive to the microstructure of the tracer distribution. The objective of this paper is to revisit the basic formalism employed in numerical models used to investigate atmospheric tracers. The main mathematical method proposed here is the theory of kinematics of mixing which could be applied effectively for simulations of atmospheric transport processes. At the beginning of the paper, we introduce simple mathematical transformations in order to demonstrate how complex topological structures are created by mixing processes. These idealistic flow systems are essential to explain transport properties of much more complex three-dimensional geophysical flows. An example of the application of the kinematics of mixing to the analysis of tracer transport on a planetary scale is presented in the following sections. The complex filamentary structures simulated in the numerical experiment are evaluated using some commonly applied statistical measures in order to compare the results with the data published in the literature. The results of the experiment are also analysed with the help of simple conceptual models of fluid filaments. The microstructure of the tracer distribution introduced in the paper is essential to increase our understanding of atmospheric transport and to develop more realistic parameterizations of small-scale mixing. The presented results could also be used to improve calculations of the coupling between microphysical processes and tracer mixing. 相似文献
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Philip W. West J. Jaime Chiang 《Journal of the Air & Waste Management Association (1995)》2013,63(7):671-673
A method is described for determining acidity by means of the spectrophotometric determination of the displacement of the equilibrium of açid-base indicators. The method is simple, sensitive and free of known interferences. There is no dependence on costly or sophisticated equipment and the results obtained are reliable and reproducible. 相似文献
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在实施ISO/IEC 17025:1999标准《检测和校准实验室能力的通用要求》过程中,通过实验室质量管理体系内部审核的实践与系统分析,识别出内部审核策划阶段的关键环节,提出审核范围确定、审核计划和抽样方案制订的质量控制要求,为有序高效地实施内部审核提供了技术方法。 相似文献