Pd-MnO2 nanoparticles/TiO2 nanotube arrays (NTAs) photo-electrodes photo-catalytic properties and their ability of degrading Rhodamine B under visible light

Pd-MnO_2/TiO_2 nanotube arrays(NTAs) photo-electrodes were successfully fabricated via anodization and electro deposition subsequently; the obtained Pd-MnO_2/TiO_2 NTAs photo electrodes were analyzed by scanning electron microscopy(SEM), X-ray diffraction(XRD) and characterized accordingly. Moreover, the light harvesting and absorption properties were investigated via ultraviolet–visible diffuse reflectance spectrum(DRS); photo degradation efficiency was investigated via analyzing the photo catalytic degradation of Rhodamine B under visible illumination(xenon light). The performed analyses illustrated that Pd-MnO_2 codoped particles were successfully deposited onto the surface of the TiO_2 nanotube arrays;DRS results showed significant improvement in visible light absorption which was between400 and 700 nm. Finally, the photo catalytic degradation efficiency results of the designated organic pollutant(Rhodamine B) illustrated a superior photocatalytic(PC) efficiency of approximately 95% compared to the bare TiO_2 NTAs, which only exhibited a photo catalytic degradation efficiency of approximately 61%, thus it indicated the significant enhancement of the light absorption properties of fabricated photo electrodes and their yield of UOH radicals.     

山林地表慢渗系统处理农村生活污水厂尾水研究

利用山区污水处理厂周边森林植被构建慢速渗滤污水处理系统,用来处理山区农村生活污水厂尾水。结果表明,慢渗系统能够深度净化污水尾水,对COD_(Cr)、NH_3-N、NO_3-N、TN、TP的平均去除率分别为23.8%、40.2%、14.3%、11.3%和23.6%。并且土层越深,COD_(Cr)、TN、TP浓度越低,相应的去除率越高,而NO_3-N、TN去除率则呈降低趋势;山体坡度越大,COD_(Cr)、氨氮浓度有升高趋势,硝态氮、TN、TP有降低趋势;而坡长越大,COD_(Cr)、NH_3-N、NO_3-N、TN浓度有降低趋势,TP有升高趋势。此外,植被类型对水样化学性质有一定影响,竹林更利于COD_(Cr)、NH_3-N、TP浓度的降低,针阔混交林更利于NO_3-N、TN浓度的降低。     

菌渣中阿维菌素残留检测方法及其无害化工艺研究

文章建立了简单、快速的阿维菌素菌渣中阿维菌素残留量高校液相色谱检测方法以及利用水热法处理阿维菌素菌渣。采用固相萃取-高效液相色谱检测方法测定阿维菌素菌渣中阿维菌素残留量,提取剂为乙腈/水=4/1(V/V),采用HLB固相萃取柱进行净化。加标回收率90.3%~107.3%,相对标准偏差(RSD)为3.00%~5.69%,阿维2菌素标准曲线线性相关系数R~2=0.999 6,线性范围为1.0~1 000 mg/L。利用正交实验,水热法处理阿维菌素菌渣,在190℃的温度下处理2 h后,菌渣中阿维菌素残留量由991.30降至0.84 mg/kg,去除率达99.92%。处理前后的菌渣与有机肥标准作对比,除含水率外其余检测指标均达到有机肥标准要求。该项研究为阿维菌素菌渣的资源化利用提供了理论依据。     

我国核事故应急“十三五”规划思路研究

通过分析我国核事故应急体系在应急预案、应急指挥、应急救援、技术支持、应急演习等多方面的已有能力,学习国外核电强国的核应急管理经验,总结福岛核事故应急的经验教训,发现我国现有核事故应急体系存在的问题,并提出"十三五"期间我国核事故应急的主要对策和措施,以期为我国核事故应急体系建设提供科学的和系统的工作思路。     

Evaluating the technical efficiencies of fishing vessels to achieve effective management of overexploited fisheries

Global marine capture fisheries are undergoing serious stress, with overfishing as one of the major problems. In order to mitigate the overexploitation of capture fisheries, government regulation or fisheries management is necessary. Among various management approaches, vessel quantity control is being widely employed. To achieve effective governance of fisheries, the technical efficiency (TE) issue needs to be considered in the implementation of vessel quantity control. Using the Pacific saury (Cololabis saira) stick-held dip net fishery in Japan as a case study, this paper estimated the TE of sampled fishing vessels and explored the possible factors affecting the gap in efficiency. This paper aims to provide suggestions for a better implementation of vessel quantity control in global Pacific saury fishery, and also to serve as an empirical example of integrating TE analysis into management of overexploited fisheries for achieving satisfactory effects. Results show the TE score of the sampled fishery averaged around 0.7 from 2009 to 2014, and factors concerning owners/skippers’ motivation such as vessel ownership and specialization, vessel tonnage as well as skippers’ age show positive effects on the TE. Our findings in the present work provide important strategies for mitigating overexploitation in fisheries. Conducting technical efficiency analysis of targeted fisheries is a vital issue to be considered for designing and realizing an effective implementation of fisheries management approaches. The large vessels and the enthusiasm of vessel owners/skippers need to be particularly addressed when vessel quantity limit is considered to mitigate the problem of overfishing.     

Impacts of climate variability and changes on domestic water use in the Yellow River Basin of China

We present a methodology for using a domestic water use time series that were obtained from Yellow River Conservancy Commission, together with the climatic records from the National Climate Center of China to evaluate the effects of climate variability on water use in the Yellow River Basin. A suit of seven Global Circulation Models (GCMs) were adopted to anticipate future climate patterns in the Yellow River. The historical records showed evidences of rises in temperature and subsequent rises in domestic water demand in the basin. For Upstream of Longyangxia region, the impact was the least, with only 0.0021?×?10⁸ m³ for a temperature increase of 1 °C; while for Longyangxia-Lanzhou region, domestic water use was found to increase to 0.18?×?10⁸ m³ when temperature increases 1 °C. Downstream of Huayuankou was the region with the most changes in temperature that gave the highest increase of 1.95?×?10⁸ m³ in domestic water demand for 1 °C of change of temperature. Downstream of Huayuankou was identified as the most vulnerable area, where domestic water demand increases nearly by 42.2 % with 1 °C increase of temperature. Judging from the trends of temperature range, we concluded that future temperature in Yellow River Basin has an increasing tendency. This could worsen the existing issues of domestic water demand and even more to trigger high competition among different water-using sectors.     

外浮顶原油储罐VOCs泄漏损耗及排放量核算

介绍了国内外浮顶原油储罐VOCs泄漏损耗形式。结合美国环保署(EPA)发布的AP-42中第7章储罐的VOCs相关排放公式,建立了外浮顶原油储罐VOCs排放量核算的方法,并对核算方法的应用进行了举例分析,有助于掌握现阶段原油外浮顶储罐的泄漏损耗量,为推进企业绿色低碳发展,控制原油储罐VOCs总量排放提供参考。     

炼化企业分析化验岗位职业病危害防治措施研究

采用现场职业卫生学调查方法了解炼化企业分析化验岗位接触各类危害因素情况,对正常情况下分析化验工作场所进行各类职业病危害因素检测,同时测量各通风橱控制点风速、排风罩罩口风速;通风橱(风机通风量增加、管道改造)以及排风罩改造后,再次进行控制点风速测量、工作场所危害因素采样检测,对比改造前后测量数据,探讨分析化验岗位职业病危害防治措施。结果显示,工作场所通风设施的风机选型、管道合理化布置、排风罩围挡的设置、补风等因素均对通风橱、排风罩控制点风速产生影响;通风设施改造后工作场所职业病危害因素浓度有所降低。由此可见,炼化企业分析化验工作场所通风设施是职业病危害防治的重要措施。     

基于GIS和LUR模型的西安市PM2.5浓度空间分布模拟研究

基于地理信息系统GIS和土地利用回归LUR模型,模拟西安市PM2.5浓度空间动态分布,结果表明:与PM2.5浓度相关性最高的分别为缓冲区为2 km的水域面积、人口密度和距离水域距离,R 2分别为0.501,0.393和0.280;与PM2.5浓度相关性最低的分别为缓冲区为4 km的水域面积、未利用地面积和耕地面积,R 2分别为0.039、0.021和0.017.未考虑风速建立的LUR模型多元回归的相关系数为0.856,R 2为0.733,考虑风速的相关系数为0.892,R 2为0.796,表明风速对于污染物的分布影响较大,LUR模型模拟效果较好.模拟的PM2.5年均浓度高风险区分布于中部,中风险区分布于中西部,低风险区分布于东南部和西部.     

延迟焦化装置含硫污水减量化实践

在分析160×10~4t/a延迟焦化装置含硫污水来源及减量化潜力基础上,通过采取优化加热炉注汽量、调整焦炭塔吹汽量、降低分馏塔汽提蒸汽量、回用含硫污水汽提净化水等管理和技术措施,装置节约了蒸汽消耗,源头减少了含硫污水产生量,增加了含硫污水汽提净化水回用量,年经济效益达460万元。