树脂与活性炭吸附油气的实验研究

吸附剂的性能对油气吸附分离的效果起着决定性的作用。测定了活性炭和吸附树脂在常温下对油气的静态吸附和脱附特性，比较吸附树脂与活性炭的吸附率、解吸率。实验结果表明，吸附树脂吸附率高，解吸容易。测定了活性炭和吸附树脂对油气的吸附穿透曲线和热效应。实验结果表明，吸附树脂的穿透时间长，温升略低，适于油气吸附分离。同时，利用Yoo...     

Distribution pattern of traditional ecological knowledge on plant utilization among major minority peoples in Guizhou,China

In this study, the traditional ecological knowledge (TEK) on non-cultivated plant utilization by the Miao and Buyi people in Guizhou, China, was investigated using semi-structured interviews and the joint plant and use (JPU) was used as an index of TEK. In addition, the regional TEK distribution patterns were depicted. The results showed that low-frequency JPUs accounted for a large proportion of the total TEK on non-cultivated plant utilization, implying a possible TEK loss. The TEK distribution pattern is similar to the 80/20 rule, indicating that most TEK is mastered by key informants who are important for regional TEK protection and inheritance. Different informants have different JPU amounts and diversities with specific relationships, and for the characteristic ethnic TEK, medicinal JPUs generally have a low frequency, while symbolic JPUs have a higher frequency. The results could provide references for regional sustainable development and biocultural diversity management.     

成都市温江区农村污水治理模式与技术研究

农村污水治理是农村人居环境整治的重点任务之一,也是其难点所在。基于乡村振兴及改善农村人居环境的战略需求,本文以成都市温江区为研究对象,分析农村污水治理的现状和存在的关键问题,探讨农村污水治理技术与模式,从农村生活污水的处理模式,农村黑臭水体处理模式以及农村污水管理模式三个方面,探索符合温江农村特点、可复制可推广的农村污水治理模式,以期为川西地区农村污水治理提供理论参考。     

4种高级氧化法处理高浓度正丙醇废水的动力学比较

研究了1%和10%(V/V)模拟正丙醇废水在UV/TiO2体系、UV/H2O2体系、Fe2+/H2O2体系和UV/TiO2/Fe2+/H2O2体系等4种工艺条件下的降解动力学过程,对比了降解动力学特点及工艺参数对动力学常数的影响,优化工艺参数。结果表明,UV/TiO2体系和Fe2+/H2O2体系的降解过程可分为零级反应阶段和一级反应阶段,转折点分别在反应开始后2 h和氧化剂浓度为6.7 g/L,UV/H2O2体系和UV/TiO2/Fe2+/H2O2体系分别符合零级反应和一级反应规律;相同工艺参数条件下,6 h反应后,组合工艺UV/TiO2/Fe2+/H2O2体系在处理效率达85%,比前3个体系分别高52.0%、8.3%和32.0%,与UV/TiO2体系和Fe2+/H2O2体系的处理效率之和持平,其协同效应提高了速率常数,在目标物浓度降低时依然可维持较高降解速率。而目标物浓度提高10倍后,UV能量利用率提高35.5倍,氧化剂用量是Fe2+/H2O2体系的1/7.1。     

Bibliometric analysis of zerovalent iron particles research for environmental remediation from 2000 to 2019

Environmental Science and Pollution Research - Zerovalent iron (ZVI) has been a major focus of research and has attracted great attention during the last 2 decades by international researchers...     

Critical Risk Indicators (CRIs) for the electric power grid: a survey and discussion of interconnected effects

The electric power grid is a critical societal resource connecting multiple infrastructural domains such as agriculture, transportation, and manufacturing. The electrical grid as an infrastructure is shaped by human activity and public policy in terms of demand and supply requirements. Further, the grid is subject to changes and stresses due to diverse factors including solar weather, climate, hydrology, and ecology. The emerging interconnected and complex network dependencies make such interactions increasingly dynamic, posing novel risks, and presenting new challenges to manage the coupled human–natural system. This paper provides a survey of models and methods that seek to explore the significant interconnected impact of the electric power grid and interdependent domains. We also provide relevant critical risk indicators (CRIs) across diverse domains that may be used to assess risks to electric grid reliability, including climate, ecology, hydrology, finance, space weather, and agriculture. We discuss the convergence of indicators from individual domains to explore possible systemic risk, i.e., holistic risk arising from cross-domain interconnections. Further, we propose a compositional approach to risk assessment that incorporates diverse domain expertise and information, data science, and computer science to identify domain-specific CRIs and their union in systemic risk indicators. Our study provides an important first step towards data-driven analysis and predictive modeling of risks in interconnected human–natural systems.

     

高职旅游专业《导游基础》课程教学研究

以调查问卷的统计结果为参考,运用定性分析和定量分析两种方法,结合学生在学习过程中存在的课程内容繁杂、识记困难等问题,从课程的特点和高职学生的特征出发,提出课程在教学过程中可通过就业驱动、多媒体手段、现场展示、案例分析、校外实践、网络化教学等方法来提高学生的学习兴趣和应用能力。     

天然和CPB改性沸石对Hg2+的吸附特征

通过静态实验研究溴代十六烷基吡啶(CPB)改性沸石和天然沸石对废水中Hg2+的吸附特性,探讨了吸附动力学、吸附平衡和吸附热力学机制。研究表明:Langmuir方程能较好地描述2种沸石对Hg2+的吸附,CPB改性沸石对Hg2+的吸附率得到显著提高。实验条件下,改性沸石对Hg2+的吸附率从67.5%提高到98.9%,吸附容量从0.521 mg/g提高到3.07 mg/g。利用准一级动力学方程、假二级动力学方程、颗粒内扩散模型和Elovich方程分别对动力学过程进行拟合,发现2种沸石对Hg2+的吸附均满足假二级动力学方程,且离子的颗粒内扩散对整个吸附过程有影响。动力学拟合、D-R方程拟合和热力学研究综合表明:2种沸石对Hg2+的吸附既存在化学吸附又存在物理吸附,吸附吉布斯自由能变(△G0)、焓变(ΔH0)、熵变(ΔS0)均小于0,反应为自发的放热反应,低温有利于吸附的进行。     

Evaluation of methane oxidation activity in waste biocover soil during landfill stabilization

The results of a nationwide survey of uranium in Swiss drinking water are reported. Elevated concentrations of uranium in groundwater are found mainly in the alpine regions and can be traced back to the geology of the bedrock. Water sources were systematically surveyed and analysed for the presence of Li, B, Si, Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Sr, Cd, Sn, Sb, Ba, Tl, Pb and U and the results were analysed to determine if any correlation with uranium concentration was apparent. No correlation was found. The results are interpreted in relation to the current WHO guideline and those of other countries with a view to determining which areas would be affected if a maximum value were to be adopted and which areas require further investigation. Uranium content varied considerably, from below the limit of detection to almost 100 μg L⁻¹. Of the 5548 data samples, 98% are below the 2004 WHO provisional guideline value of 15 μg L⁻¹ and 99.7% below the revised (2011) value of 30 μg L⁻¹.     

The in situ catalytic oxidation of sulfamethoxazole via peroxydisufate activation operated in a NG/rGO/CNTs composite membrane filtration

Environmental Science and Pollution Research - Metal-free carbonaceous composite membranes have been proven to effectively drive novel in situ catalytic oxidation for the degradation of organic...