混凝沉淀 A~2/0工艺处理化工、城镇混合废水

采用混凝沉淀 A2/0工艺处理化工、城镇混合废水。在化工废水经有效预处理的条件下,该工艺处理效果良好,出水水质达到《污水综合排放标准》(GB8978-1996)中的一级标准。     

Graphitic carbon nitride-based photocatalysts in the applications of environmental catalysis

Semiconductor photocatalytic technology has shown great prospects in converting solar energy into chemical energy to mitigate energy crisis and solve environmental pollution problems. The key issue is the development of high-efficiency photocatalysts. Various strategies in the state-of-the-art advancements, such as heterostructure construction, heteroatom doping, metal/single atom loading, and defect engineering, have been presented for the graphitic carbon nitride (g-C₃N₄)-based nanocomposite catalysts to design their surface chemical environments and internal electronic structures to make them more suitable for different photocatalytic applications. In this review, nanoarchitecture design, synthesis methods, photochemical properties, potential photocatalytic applications, and related reaction mechanisms of the modified high-efficiency carbon nitride-based photocatalysts were briefly summarized. The superior photocatalytic performance was identified to be associated with the enhanced visible-light response, fast photoinduced electron-hole separation, efficient charge migration, and increased unsaturated active sites. Moreover, the further advance of the visible-light harvesting and solar-to-energy conversions are proposed.     

中和混凝与催化氧化法处理高浓度有机废水

以CODCr3000－8000mg/L,色度900－2000倍,pH＜1的难生化降解的有机废水为水样,采用中和混凝沉淀与催化作用为主的组合工艺对其进行处理试验,着重研究了有关的工艺条件与CODCr去除率的关系。结果表明：只要严格控制中和pH及混凝剂投量和催化氧化的药剂投量、氧化pH和时间,可以获得CODCr去除率为95％－96％的良好效果,同时排放水质中pH、SS和色度均达到排放标准。     

Biomass chemical looping gasification for syngas production using modified hematite as oxygen carriers

Syngas is a clean energy carrier and a major industrial feedstock. In this paper, syngas was produced via biomass chemical looping gasification(CLG) process. Hematite, the most common Fe-based oxygen carrier(OC), was modified with different metal oxides(CeO₂, CaO and MgO) by the impregnation method. The hematite modified by CeO₂, CaO and MgO was namely as CeO₂-hematite(CeO₂-H), CaO-hematite(CaO-H) and MgO-hematite(MgO-H), respectively. The introduction...     

中国癌症与土壤环境中化学元素的相关性研究

利用土壤元素数据2069448个，癌死亡调查资料787080例，研究了胃癌、食管癌、肝癌、宫颈癌、肺癌、大肠癌、白血病、鼻咽癌、乳腺癌死亡与人群生存的土壤环境中64个元素的相关性。得出了这些癌症死亡率与哪些元素呈正、负相关的统计结果。     

废弃危险化学品安全填埋处置的主要环节及控制

结合沈阳市在废弃物危险化学品安全填埋处置工作中的有关实际 ,介绍了通过安全填埋技术处置废弃危险化学品的各主要技术环节及各环节的控制要点 ,希望此方面技术得到不断发展和应用     

Binary mixtures of feeding deterrents mitigate the decrease in feeding deterrent response to antifeedants following prolonged exposure in the cabbage looper, <Emphasis Type="Italic">Trichoplusia ni</Emphasis> (Lepidoptera: Noctuidae)

Summary. The effect of rearing larvae of Trichoplusia ni on individual feeding deterrents or on binary mixtures of deterrents on their subsequent gustatory sensitivity was measured in paired choice leaf disc bioassays. Our working hypothesis was that mixtures of antifeedants (pure allelochemicals) would mitigate decreased feeding deterrent response following prolonged exposure in this generalist herbivore. Neonate larvae were reared on cabbage leaves treated with individual feeding deterrents (digitoxin, thymol, toosendanin or xanthotoxin), or with binary mixtures of these until the third instar. Feeding deterrent responses to each antifeedant or mixture was then determined in a leaf disc choice bioassay. All of the mixtures produced additive deterrence when presented to naïve larvae. Larvae reared on individual antifeedants showed a significantly decreased feeding deterrent response (except to digitoxin), whereas larvae reared on binary mixtures of antifeedants did not show a decreased feeding deterrent response to any of them. Such mixtures were synergistic in terms of their feeding deterrence to experienced larvae. Our experiment supports the hypothesis (Jermy 1986) that mixtures of deterrents can prevent decreased feeding deterrent response following prolonged exposure, and provides one explanation for the multiplicity of chemical defenses found in many plants.     

废石膏用于道路回填材料的处理工艺及性能研究

讨论了化工废石膏在矿物掺合物、粉煤灰、激发剂、外加剂等存在时，在不同配比下的力学性能、凝结时间、溶蚀率、软化系数和体积稳定性，并分析了该材料水化、硬化规律，硬化体结构及与性能的关系，试验结果表明，化工废石膏掺加量的多少将直接影响到各项性能指标，采用复合早强减水剂，对于粉煤灰活性激发，及加速胶结材料凝结水化、降低用量，有显著效果。     

有毒化学物品的污染与防治

本文就有毒化学品的生产、使用，给环境带来新的污染与危害问题，概括地阐述了国内外防治有毒化学品的污染状况；并针对当前的具体问题，提出防治和控制措施．