Enhanced performance of alkali-modified Bi2WO6/Bi0.15Ti0.85O2 toward photocatalytic oxidation of HCHO under visible light

Environmental Science and Pollution Research - Photocatalytic oxidation of formaldehyde (HCHO) is considered as one of the promising ways to resolve indoor air HCHO pollution. TiO2 has been well...     

动力学光度法测定环境样品中微量钒

本文研究了V(Ⅳ)对Cr_2O_7~(2-)-I~--淀粉氧化还原反应体系的诱导作用,以此为基础提出了一种测定微量钒的动力学新方法,并建立了测定最佳条件:[Cr_2O_7~(2-)]=8.4×10~(-5)mol·L~(-1),[I~-]=2.1×10~(-3)mol·L~(-1),pH=2.1,585nm。在此条件下,钒(Ⅳ)含量在0—6.6μg·ml~(-1)范围内符合比尔定律,方法检测限为0.02μgV(IV)·ml~(-1)。除Fe~(3+),Fe~(2+),Sn~(2+),Ti~(3+)外,其它共存离子不影响测定。用本方法测定了几种环境样品中的微量钒,结果满意,标准加入回收率为95.1—98.3％。     

含油污泥热解处理的试验与应用

介绍了欢三联含油污泥热解处理工程的工艺流程、技术要点、设计参数、运行效果和效益情况。调试工作表明,热解炉系统工艺作为一个整体,能够稳定有效运行,残渣的测验结果表明,残渣可以达到无害化程度,含油率小于0.3%(满足GB 4284-84《农用污泥中污染物控制标准》的要求)。以12t/d的处理量运行,能耗成本为74.47元/t,产生的经济效益为125.50元/t,同时产生较好的社会效益。另外,热解固态产物也有较好的利用价值,可以进一步研究利用。     

The role of atmospheric circulation system playing in coupling relationship between spring NPP and precipitation in East Asia area

In many East Asia regions, spring (from March to May) precipitation is an important restricting factor to vegetation growth, and atmospheric circulation system may influence spring precipitation patter. It is helpful to under the response of ecosystem to climate change by studying the influence of atmospheric circulation system on the coupling relationship between spring net primary productivity and precipitation. Driving CASA (Carnegie-Ames-Stanford Approach) NPP (Net Primary Productivity) model, we estimated spring NPP for East Asia area (70 degrees E-1 70 degrees E, 10 degrees N-70 degrees N) from 1982 to 1999, and by the method of singular value decomposition we further analyzed the coupling features of spring NPP with precipitation. The result showed that the response features of NPP to precipitation were mainly embodied within the leading six NPP-precipitation paired-modes. The interpretation rates of the leading six paired-modes to the covariance of NPP-precipitation were 42.91, 23.29, 9.96, 5.60, 5.04 and 3.95%, respectively, and total to 90.75%. The temporal correlation coefficients of the leading six paired-modes were 0.830, 0.889, 0.841, 0.747, 0.912 and 0.923, respectively, and all the correlations were significant at significant level of 0.001. In some high latitude regions, there was no obviously corresponding relationship between NPP and precipitation in the leading two paired-modes, and the reason of it may be that spring temperature was the main restricting factor to NPP. In middle and low latitude regions, the effect of precipitation on NPP was relatively more notable. Nine atmospheric circulation factors in spring affected the patterns of NPP and precipitation greatly, and the regions with interpretation rate over 50% shared 60.41 and 65.58% of the whole study area, respectively.     

聚丙烯酰胺在盐碱土壤中的吸附与迁移

采用静态吸附法研究了聚丙烯酰胺（PAM）在大庆市盐碱土中的吸附行为,并通过室内土柱实验研究了PAM在盐碱土中的自然迁移和模拟降雨情况下的迁移行为。实验结果表明,随吸附时间延长、液固比增大,PAM在盐碱土中的吸附量逐渐增大。PAM在盐碱土中的饱和吸附条件为液固比25,平衡吸附时间8h,在此条件下得出的PAM在盐碱土中的吸附等温线符合Langmuir等温吸附模型,饱和吸附量为0．81mg/g.PAM在盐碱土中的迁移规律为：沿地表随盐碱土深度增加,PAM的含量减少。PAM溶液淋滤量越大,迁移深度越深,各层土壤中PAM的含量也相应增加。降雨迫使PAM沿地表向下多迁移1cm,迁移深度在5—6cm。盐碱土对PAM的截留能力较强,意外泄漏的PAM主要集中在地表下3cm以内处,占总淋滤量的86．1％～99．9％。PAM在大庆市盐碱土中的迁移深度不超过10cm。     

均衡的植物养分有助于增强茶树抵御真菌的能力从而减少杀虫剂的使用

人们正加大努力以求最大限度地降低杀虫剂的使用,这些杀虫剂是控制茶树和其它作物的病虫害的基本手段 .在中国,由于土壤常常缺少碳酸钾,所以适量使用这种养料有助于减少对杀虫剂的需要 .已经证实,在土壤中加入钾后,茶树感染真菌病的比率下降 .     

餐厨垃圾厌氧产氢综述

针对餐厨垃圾厌氧产氢过程,从工艺、单组分底物厌氧产氢和过程机理研究阐述了国内外进展,并对未来研究发展方向进行了展望.研究成果表明,餐厨垃圾厌氧发酵产氢过程可行,但影响因素多,系统不稳定,大部分研究停留在实验室小试阶段.尚需针对餐厨垃圾厌氧发酵产氢优势菌种选育、生态因子调控、代谢机理、反应器改进和系统控制模拟等方面开展研究,为该技术的大规模应用提供研究基础.     

临界距离老空水下薄煤层联合开采安全性分析

以现场实测结果为基础 ,利用数值模拟与反演方法分析了薄煤层联合开采的顶、底板破坏范围。根据分析的结果评价了临界距离老空水下薄煤层联合开采的安全性。