调节风阀与风量的测量

根据玻璃熔窑助燃风系统 ,分析了工业炉燃烧自动控制过程中 ,调节风阀结构和流量计及其相对安装位置对风量测量及自控的影响 ,对通风自控系统设计、选型及安装具有一定的参考价值     

不同活性组分催化剂的氧化活性和热稳定性

采用流动法催化反应装置测定了蜂窝陶瓷负载催化剂同时催化氧化丙烷 ( C₃H₈)、丙烯 ( c₃H₆)和 CO的活性 ,考察活性组分 Pd和非贵金属氧化物、La改性、反应空速对起燃温度、热稳定性和动力学转化特征的影响 .结果显示 ,含 Pd催化剂上 C₃H₆和 CO的起燃温度比 C₃H₈低 ,1150℃高温老化对 C₃H₈氧化性能的影响比对 C₃H₆和 CO的小 .含稀土非贵金属氧化物的活性、热稳定性及动力学转化性能都比单 Pd催化剂低 ,添加 La能提高 2类催化剂的初活性和高温热稳定性 .     

生物脱氮除磷工艺中的丝状菌

在生物脱氮除磷工艺中,污泥膨胀是运行管理的难题。介绍了生物脱氮除磷工艺中丝状菌的种类和数量的变化,数据表明,生物脱氮除磷工艺中的丝状菌主要是微丝菌,其次是0675型和0914型菌。经分析认为,污泥龄的增加会促进丝状菌长度的明显增长并导致污泥膨胀,生物残渣的浓度是造成长泥龄污泥膨胀的原因之一。厌氧阶段有分解生物残渣的功能,可改善菌胶团菌的微环境,从而抑制丝状菌的过剩生长,控制污泥膨胀。     

大气气溶胶中有机成分研究进展

有机物是大气气溶胶的重要组成部分,尤其是在细颗粒中,可占其干重的10%～70%。由于有机气溶胶的健康及气候效应,有机物的组成、源分布、颗粒行为等的研究越来越受到人们的重视。其中,有机物成分的鉴别和定量已成为近年来的研究热点。在分析中,就目前有机气溶胶的采样、有机成分提取、分离及定性、定量分析方法进行了综述,并比较了各种方法的优缺点。     

负载稀土元素活性碳纤维在微型反应器中净化NO废气

以NH3为还原剂,以活性碳纤维（ACF）、HNO,浸渍的ACF、负载CuO的ACF和负载La2O3的ACF为催化剂,在微型反应器中考察各种催化剂对NO催化还原的活性,并进行了差热-热重、扫描电镜分析。实验结果表明,ACF负载La能有效地改善催化剂的活性,且催化活性中心为非晶态的氧化物;当ACF负载20％的La2O3时具有最好的低温活性,NO的去除率最高可达92％以上。     

Study on coupling between mineral resources exploitation and the mining ecological environment in Shanxi Province

Environment, Development and Sustainability - Due to rapid socioeconomic development, seeking the coordination of resources exploitation and the ecological environment has become an objective...     

Effects of Topographical Heterogeneity and Dispersal Limitation on Species Turnover in a Temperate Mountane Ecosystem: a Case Study in the Henan Province,China

Species turnover patterns can be inconsistent due to differences in the dispersal ability of different growth forms. Here, species of trees, shrubs, herbs, and bryophytes in the Xiaoqinling National Nature Reserve in China were analyzed to determine patterns of species turnover along an elevation and spatial gradient. Variance partitioning was used to assess the relative contribution of topographic heterogeneity and dispersal limitation to species turnover. Our results suggest that the effect of dispersal limitation is more important than topographic heterogeneity on species turnover in temperate mountane ecosystems in the study area. Dispersal limitation has a greater effect on trees species turnover than on shrubs, herbs or bryophytes species turnover.     

麻质活性炭的制备及其对Cu~(2+)的吸附研究

以废麻为原料,KOH为活化剂制备粉状活性炭,通过静态吸附实验研究了活性炭对Cu2+的吸附性能,探讨了溶液起始pH值、活性炭投加量、吸附时间、起始Cu2+质量浓度等对Cu2+吸附效果的影响。结果表明,溶液pH和活性炭投加量对吸附效果有较大影响,活性炭对Cu2+的吸附率在60 min内超过50%,初始浓度在10~50 mg/L时,活性炭对Cu2+的吸附量与起始浓度近似成正比。采用Langmuir、Freundlich吸附等温式对吸附平衡数据进行了拟合,结果表明吸附等温线符合Frenudlich模型。采用傅立叶红外光谱法(FT-IR)分析了活性炭的表面官能团,分析表明活性炭表面酸性官能团可能是吸附Cu2+的活性中心。     

Sulfamethoxazole sorption by sediment fractions in comparison to pyrene and bisphenol A

The environmental behavior of antibiotics has attracted great research attention. However, their sorption mechanisms in soils/sediments are still unknown. Comparison of the sorption properties between the widely-studied hydrophobic organic contaminants (HOCs) and antibiotics may provide valuable insight to antibiotic sorption mechanisms. Thus, in this study batch experiments for pyrene (PYR), bisphenol A (BPA), and sulfamethoxazole (SMX) sorption were conducted on a sediment sample and its separated fractions. Our results showed the high sorption of PYR on black carbon and organic matter. Although high sorption of SMX was observed for both separated organic fractions (humic acids) and inorganic mineral particles, the original sediment particles showed relatively low sorption. Competitive sorption between SMX and dissolved humic acid on mineral particles was observed in this study. This competitive interaction is a unique process for antibiotic sorption in soils/sediments compared with apolar HOCs and may be one of the important factors controlling the antibiotic sorption.     

Evaluation of airborne particulate matter and metals data in personal,indoor and outdoor environments using ED-XRF and ICP-MS and co-located duplicate samples

Factors and sources affecting measurement uncertainty associated with monitoring metals in airborne particulate matter (PM) were investigated as part of the Windsor, Ontario Exposure Assessment Study (WOEAS). The assessment was made using co-located duplicate samples and a comparison of two analytical approaches: ED-XRF and ICP-MS. Sampling variability was estimated using relative percent difference (RPD) of co-located duplicate samples. The comparison of ICP-MS and ED-XRF results yields very good correlations (R² ≥ 0.7) for elements present at concentrations that pass both ICP-MS and ED-XRF detection limits (e.g. Fe, Mn, Zn, Pb and Cu). PM concentration ranges (median, sample number) of 24-h indoor PM₁₀ and personal PM₁₀ filters, and outdoor PM_2.5 filters were determined to be 2.2–40.7 (11.0, n = 48) μg m^?3, 8.0–48.3 (11.9, n = 48) μg m^?3, and 17.1–42.3 (21.6, n = 18) μg m^?3, respectively. The gravimetric analytical results reveal that the variations in PM mass measurements for same-day sampling are insignificant compared to temporal or spatial variations: 92%, 100% and 96% of indoor, outdoor and personal duplicate samples, respectively, pass the quality criteria (RPD ≤ 20%). Uncertainties associated with ED-XRF elemental measurements of S, Ca, Mn, Fe and Zn for 24-h filter samples are low: 78%–100% of the duplicate samples passed the quality criteria. In the case of 24-h filter samples using ICP-MS, more elements passed the quality criteria due to the lower detection limits. These were: Li, Na, K, Ca, Si, Al, V, Fe, Mn, Co, Cu, Mo, Ag, Zn, Pb, As, Mg, Sb, Sn, Sr, Th, Ti, Tl, and U. Low air concentrations of metals (near or below instrumental detection limits) and/or inadvertent introduction of metal contamination are the main causes for excluding elements based on the pass/fail criteria. Uncertainty associated with elemental measurements must be assessed on an element-by-element basis.