某石化企业境外员工身心健康状况调查分析及管理建议

对境外员工健康事件进行了调查统计,分析了健康事件发生的原因,提出了境外员工健康管理建议。     

生活垃圾渗滤液膜浓缩液固化初探

富集盐分和难降解有机物的生活垃圾渗滤液膜浓缩液处理困难。文章以粒化高炉矿渣为主要成分,辅以碱性激发剂和增稠组分配制专用固化剂,对多地垃圾渗滤液膜浓缩液进行了固化试验,固化剂掺量占浓缩液质量50%的前提下,固化后浆体不泌水,固化试样28 d强度可达2 MPa以上,且试样重金属浸出浓度等指标符合生活垃圾填埋场填埋要求。     

分析钛管冷凝除湿技术在燃煤电厂烟羽治理中的应用实例

目前消除"有色烟羽"主要采用MGGH、GGH等烟气再热技术,这些技术只是通过提高烟气扩散消除"有色烟羽"的视觉感受,但不能减少污染物和水汽的排放。本文介绍了一种钛管冷凝除湿技术在某300MW循环流化床机组"烟羽治理"中的实际应用,并对冷凝除湿过程中烟气水回收、污染物协同治理等效果进行分析,最终实现节水及污染物协同减排的目的。     

Catalytic Activity of Biomorphic α-MoO(3) in the Degradation of Methyl Violet Dye

A network of fibers comprising orthorhombic molybdenum trioxide (α-MoO(3)) crystals were synthesized using paper as template via a biomorphic approach. The template was completely removed by annealing the sample at 600°C for 5?min. Monoclinic MoO(3) was formed and consequently converted into orthorhombic α-MoO(3) after prolonged annealing. Three milligrams of the biomorphic α-MoO(3) could degrade up to 90% of a methyl violet aqueous solution with a concentration of 20?mg/L under normal visible light. The size of the α-MoO(3) grains and the porosity of the biomorphic sample affected catalytic performance.     

河北省自然保护区现状调查与规划研究

在河北省自然保护区现状调查的基础上,探讨目前自然保护区建设中的主要问题,并对河北省自然保护区规划和对策进行研究。     

基于CFD的超薄平板膜MBR流态模拟及优化分析

随着MBR的广泛应用,为控制膜污染导致高运行成本问题,优化新型平板膜MBR的曝气条件成为目前的一个研究热点。本研究通过使用CFD Fluent软件,结合多相流模型和湍流模型进行超薄平板膜MBR的高质量流态模拟,量化膜面剪切力,并从流场及膜污染角度分别对3种气水比(10∶1、15∶1和20∶1)工况下的MBR进行了优化分析,选择出超薄平板膜MBR的最优气水比。研究结果表明,膜片之间的流速分布均存在中间大、两侧小的不均匀性,且单个膜面剪切力分布与MBR流态特征密切相关,膜面颗粒沉积概率与剪切力均值呈负相关;对比了以0.1m·s^-1为临界流速的不同曝气下的流场形态分布特性,并综合考虑曝气能耗及膜面冲刷,确定3种气水比中的最优值为15∶1。     

潭江流域水质时空分布特征及其与土地利用的相关性分析

以潭江流域为研究区域,利用2016年5月TM遥感影像底图,结合Google高清影像和实地调查修正获取流域土地利用图。运用ArcGIS分析工具,将流域分为26个子流域,研究各子流域的土地利用结构。根据2015~2016年不同水期的水质监测,分析TP、TN、NH_4~+-N、高锰酸盐、COD的时空分布特征;利用spearman相关与逐步多元回归分析其与土地利用结构的相关性。结果表明,各项水质指标基本表现为丰水期优于平水期,枯水期最次。在空间上,上游水质优于中游水质,下游水质最次。流域土地利用结构与水质之间的关系表现为:林地、草地能够缓解水质恶化,相当于"汇",耕地、建设用地、水体会导致水质恶化,相当于"源"。建设用地是对水质恶化影响最大的因素,其次是耕地。部分流域污水处理率有限及污水处理的水质标准与地表水水质标准的差距较大,可能是水质难以好转的主要原因。林地能够显著改善水质,应该加强管理和保护。     

Vehicle emissions of primary air pollutants from 2009 to 2019 and projection for the 14th Five-Year Plan period in Beijing, China

Over the past decade, the emission standards and fuel standards in Beijing have been upgraded twice, and the vehicle structure has been improved by accelerating the elimination of 2.95 million old vehicles. Through the formulation and implementation of these policies, the emissions of carbon monoxide (CO), volatile organic compounds (VOCs), nitrogen oxides (NO_x), and fine particulate matter (PM_2.5) in 2019 were 147.9, 25.3, 43.4, and 0.91 kton in Beijing, respectively. The emission factor method was adopted to better understand the emissions characteristics of primary air pollutants from combustion engine vehicles and to improve pollution control. In combination with the air quality improvement goals and the status of social and economic development during the 14th Five-Year Plan period in Beijing, different vehicle pollution control scenarios were established, and emissions reductions were projected. The results show that the emissions of four air pollutants (CO, VOCs, NO_x, and PM_2.5) from vehicles in Beijing decreased by an average of 68% in 2019, compared to their levels in 2009. The contribution of NO_x emissions from diesel vehicles increased from 35% in 2009 to 56% in 2019, which indicated that clean and energy-saving diesel vehicle fleets should be further improved. Electric vehicle adoption could be an important measure to reduce pollutant emissions. With the further upgrading of vehicle structure and the adoption of electric vehicles, it is expected that the total emissions of the four vehicle pollutants can be reduced by 20%-41% by the end of the 14th Five-Year Plan period.     

浅析GBZ49-2014标准所摒弃的“观察对象”

结合在从事职业健康检查中应用GBZ49-2002《职业性听力损伤诊断标准》、GBZ49-2007《职业性噪声聋诊断标准》与GBZ49-2014《职业性噪声聋诊断》进行听力测试评定的实践,认为新旧标准更替中先后取消观察对象分级和观察对象,对劳动者的听力监护工作存在着不利的影响,建议相关部门采取相关补充措施,重新科学、合理界定观察对象及其分级,以更利于用人单位做好听力监护工作。     

90Sr在干旱地区包气带砂土中的迁移研究

放射性废物处置的基本安全目标是保护人类和环境免受电离辐射的有害影响.开展处置场环境影响评价可以量化它对人体健康和环境潜在影响.90Sr是放射性废物中具有代表性的裂变核素.为了获取90Sr在干旱地区某处置场址包气带砂土中的迁移规律,采用静态实验和动态实验对其在砂土的迁移进行了研究.结果表明,对于该场址,砂土对90Sr的吸附能力较弱;静态实验测量得到的分配系数与动态实验拟合计算得到的相差约一个量级;采用非平衡模式模拟该场址包气带砂土中90Sr的迁移更为恰当.