金属有机骨架材料对水中有机酸的吸附性能

制备了MIL-100(Fe)、MIL-100(Cr)和NH_2-MIL-101(Al)3种金属有机骨架(MOFs)材料,考察了这3种MOFs材料对苯甲酸、水杨酸和山梨酸3种有机酸模拟废水的吸附处理效果,并与大孔吸附树脂D101进行了比较。实验结果表明:NH_2-MIL-101(Al)对苯甲酸的平衡吸附量最大,D101平衡吸附量中等,MIL-100(Cr)和MIL-100(Fe)平衡吸附量很小;NH_2-MIL-101(Al)对山梨酸具有优异的吸附性能,MIL-100(Cr)、MIL-100(Fe)和D101对山梨酸的平衡吸附量较低;3种MOFs材料和D101对水杨酸的平衡吸附量均很小。NH_2-MIL-101(Al)对山梨酸和苯甲酸的等温吸附过程可用Langmuir方程更好地拟合;NH_2-MIL-101(Al)对水杨酸的等温吸附过程可用Freundlich方程更好地拟合。     

Water quality assessment in Qu River based on fuzzy water pollution index method

A fuzzy improved water pollution index was proposed based on fuzzy inference system and water pollution index. This method can not only give a comprehensive water quality rank, but also describe the water quality situation with a quantitative value, which is convenient for the water quality comparison between the same ranks. This proposed method is used to assess water quality of Qu River in Sichuan, China. Data used in the assessment were collected from four monitoring stations from 2006 to 2010. The assessment results show that Qu River water quality presents a downward trend and the overall water quality in 2010 is the worst. The spatial variation indicates that water quality of Nanbashequ section is the pessimal. For the sake of comparison, fuzzy comprehensive evaluation and grey relational method were also employed to assess water quality of Qu River. The comparisons of these three approaches'' assessment results show that the proposed method is reliable.     

HSE管理体系审核的主要记录

对一个单位进行HSE管理体系审核时,短时间内要面对大量的记录,做到面面俱到比较困难.因此,审核时重点选择重要记录作为审核对象十分必要,这样不但可以有效取得审核的证据,而且,也把握住了体系运行的关键环节,提高了审核的效率.     

浅谈作业场所有害因素检测工作的质量控制

从实际工作出发,围绕质量管理体系的控制要点,探讨了作业场所有害因素检测工作的质量控制.     

铁屑在印染废水处理中的应用研究

印染废水由于污染物浓度高,成分复杂,可生化性差,成为难处理的工业废水之一。本文从铁屑的还原性、电化学性质和絮凝作用三方面阐述了铁屑对印染废水的作用机理,介绍了铁屑微电解法处理印染废水,铁屑与其他物质组合处理印染废水,生物铁法等在印染、染料废水处理方面的研究现状、应用情况以及部分作用机理,研究表明铁屑在印染废水的COD和色度去除率方面显示出良好的治理效果,利用铁屑治理染料和印染废水,有以废治废的特点,具有很高的推广应用价值。     

灌区上游水源区生态价值评估方法及实例研究

灌区上游水源区所产生的巨大生态效益对灌区的经济社会发展有着举足轻重的作用。基于对灌区上游水源区生态价值要素的识别,构建了包含4个层次、18项评估指标的灌区上游水源区生态价值评估指标体系,较为全面地反映了区域生态价值的整体构成。并以淠史杭灌区的上游水源区为例,用影子工程法、市场价值法等定量的方法,分别从物质产品价值和生态服务价值两方面评估了其生态价值。结果表明：淠史杭灌区上游水源区的生态价值总量为425．17亿元,充分体现了上游水源区对下游乃至全社会做出的巨大生态服务贡献。     

Antibiotic resistomes in water supply reservoirs sediments of central China: main biotic drivers and distribution pattern

Environmental Science and Pollution Research - Water supply reservoirs form one of the critical drinking water resources. Their water quality directly affects human health. However, reservoir...     

Ni-Co bimetallic catalysts on coconut shell activated carbon prepared using solid-phase method for highly efficient dry reforming of methane

Ni-Co bimetallic catalysts supported on coconut shell activated carbon are synthesized using solid-phase method and investigated for dry reforming of methane, to explore the impact of Ni:Co ratio on the catalyst activity and stability. The catalyst performances are evaluated under the temperature varying from 600 to 900 °C and gas hourly space velocity (GHSV) of 7200 mL/h·g-cat. The characterization results show that metal nanoparticles are produced on the support, and the bimetallic catalyst with an explicit Ni:Co ratio (2:1) is the most beneficial for metal particle dispersion and acquires the minimum particle size of 4.41 nm. The bimetallic catalysts with an explicit Ni:Co ratio of 1:2 and 1:1 exhibit a synergistic effect towards the conversions of CH₄ and CO₂, respectively. The experimental results reveal that the highest CH₄ and CO₂ conversions rise to 94.0% and 97.5% within 12 h at 900 °C on average, respectively, assisted with the two bimetallic catalysts. The intensity of disordered carbon and thermal stability are enhanced with the extension of reforming process, contributing to a long-term catalytic stability. Besides, no obvious carbon deposition is detected, leading to a highly catalytic stability for the bimetallic catalysts.

     

Removal of cyanobacterial blooms in Taihu Lake using local soils. II. Effective removal of Microcystis aeruginosa using local soils and sediments modified by chitosan

After sepiolite was modified with Fe3+ to increase its surface charge, the initial algal removal rate increased significantly, but its Q8h was not improved substantially at clay loadings below 0.1 g/L. Modification on netting and bridging properties of clays by either chitosan or polyacrylamide (PAM) dramatically increased flocculation (Q8h) of MA cells in freshwaters. Algal removal efficiencies of different solids, including Type III clays, local soils and sediments, were all improved to a similar level of >90% at a total loading of 0.011 g/L (contained 0.001 g/L chitosan) after they were modified with chitosan, making the idea of clearing up algal blooms using local soils/sediments possible. The mechanism of netting and bridging was confirmed to be the most important factor in improving the removal efficiency of cells, whereas clays also played important roles in the sedimentation of the floc.     

Understanding the social impacts of enforcement activities on illegal wildlife trade in China

Illegal wildlife trade enforcement is a cornerstone conservation strategy worldwide, yet we have a limited understanding on its social impacts. Using Chinese online wildlife seizure news (2003–2018), we evaluated the interactions among enforcement operations, news frequency, and social engagement (i.e., whistle-blowing) frequency. Our results showed that intensive enforcement operations, which commenced after 2012, have social impacts by increasing the frequency of all seizure news significantly by 28% [95% Confidence Interval (CI): 5%, 51%] and those via whistle-blowing by 24% [95% CI: 2%, 45%], when compared to counterfactual models where possible confounding factors were accounted for. Furthermore, we revealed the potential interaction between enforcement seizure news with and without social engagement, and the consequential social feedback process. Of the species identified from ‘whistle-blowing’ news, up to 28% are considered as high conservation priorities. Overall, we expanded our understanding of the enforcement impacts to social dimensions, which could contribute to improving the cost-effectiveness of such conservation efforts.Supplementary InformationThe online version contains supplementary material available at 10.1007/s13280-021-01686-9.