Effect of SiO2 addition on NH4HSO4 decomposition and SO2 poisoning over V2O5–MoO3/TiO2–CeO2 catalyst

The deposition of NH₄HSO₄ and the poisoning effect of SO₂ on SCR catalyst are the main obstacles that restrict the industrial application of CeO₂-doped SCR catalysts. In this work, deposited NH₄HSO₄ decomposition behavior and SO₂ poisoning over V₂O₅–MoO₃/TiO₂ catalysts modified with CeO₂ and SiO₂ were investigated. By the means of characterization analysis, it was found that the addition of SiO₂ into VMo/Ti–Ce had an impact on the interaction existed between catalyst surface atoms and NH₄HSO₄. Temperature-programmed methods and in situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS) experiments indicated that the doping of SiO₂ promoted the decomposition of deposited NH₄HSO₄ on VMo/Ti–Ce catalyst surface by reducing the thermal stability of NH₄HSO₄ and enhancing the NH₄HSO₄ reactivity with NO in low temperature. And this improvement may be the reason for the better catalytic activity than VMo/Ti–Ce in the case of NH₄HSO₄ deposition. Accompanied with cerium sulfate species generated over catalyst surface, the conversion of SO₂ to SO₃ was inhibited in SiCe mixed catalyst. The addition of SiO₂ could promote the decomposition of cerium sulfate, which may be a potential strategy to enhance the resistance of SO₂ poisoning over CeO₂-modifed catalysts.     

Enhanced biohydrogen generation from organic wastewater containing NH 4+ by phototrophic bacteria Rhodobacter sphaeroides AR-3

NH₄⁺ is typically an inhibitor to hydrogen production from organic wastewater by photo-bacteria. In this experiment, biohydrogen generation with wild-type anoxygenic phototrophic bacterium Rhodobacter sphaeroideswas found to be sensitive to NH₄⁺ due to the significant inhibition of NH₄⁺ to its nitrogenase. In order to avoid the inhibition of NH₄⁺ to biohydrogen generation by R. sphaeroides, a glutamine auxotrophic mutant R. sphaeroides AR-3 was obtained by mutagenizing with ethyl methane sulfonate. The AR-3 mutant could generate biohydrogen efficiently in the hydrogen production medium with a higher NH₄⁺ concentration, because the inhibition of NH₄⁺ to nitrogenase of AR-3 was released. Under suitable conditions, AR-3 effectively produced biohydrogen from tofu wastewater, which normally contains 50–60 mg/L NH₄⁺, with an average generation rate of 14.2 mL/L·h. This generation rate was increased by more than 100% compared with that from wild-type R. sphaeroides.     

基于真实进步指标对我国可持续发展的预警评估

随着可持续发展概念的提出，国内外学者对可持续发展指标体系做出了大量的研究。但是这些指标体系大多数并没有对短期内经济的高速增长是否会对可持续发展状态产生影响做出回答。针对我国近年来经济的高速增长。本文提出的一个新问题即是我国可持续发展的风险问题。选取衡量可持续发展的经济类指标——真实进步指标（GPI）刚对我国的可持续发展是否存在风险进行预警评估．通过计算我国1994—2005年间的GPI值。并将其与我国同期的GDP值进行比较。得出了我国的经济发展具有较好的可持续性的结果。以此为依据对我国可持续发展状况进行预警评估．提出了应继续提高居民收入，扩大基础设施投资。缓解城乡分配不均。进一步不断提高经济增长的质量。以提高我国的可持续发展能力。     

某油田作业区HSE培训管理现状研究与思考

通过实地考察，采用现场观察、员工访谈、文件与记录调阅的方法，收集了某油田作业区HSE培训管理方面的信息，用OPPT方法对HSE培训管理现状进行了分析、研究，得出了该作业区HSE培训管理好的做法和不足，并提出了改进意见。     

四湖地区猕猴桃高效栽培模式与关键技术

针对地处四湖腹地的湖北省监利县果树资源利用率低及涝洼湿地的地理环境和生态条件 ,提出加快果树资源品种结构的调整 ,监北地势稍高 ,排灌方便的地方大力发展以猕猴桃为主的产业 ,同时利用架面下的行间土地套种蔬菜、瓜类作物、草莓、食用菌以及耐荫湿的中草药植物等立体生态农业的栽培模式 ,达到经济效益和生态效益的同步增长 ,与其相配套的栽培关键技术是采用地下通气排灌暗沟设施 ,重施有机质肥加磷肥 ;高畦壮苗定植 ;巧施追肥 ;适时排灌 ;树盘覆草保墒 ;人工辅助授粉和疏花疏果     

注水采油对中原油田生态环境的影响分析

随着近30年来中原油田高强度、大面积的石油开采，高强度注水采油和超采地下水造成的负面效应日益凸现。通过地下水位下降，地下漏斗面积增大，地面沉降，地裂缝，土壤、水体污染五个方面阐述了注水采油带来的生态环境问题，以及由此导致的对公共设施和建筑物的破坏、水土污染等严重后果。     

GIS在广西香蕉低温冻害分析中的应用

根据香蕉生长状况、受害程度与低温冻害强度的关系,确定香蕉冻害的等级指标;利用广西90个气象台站30年的气候资料和台站地理信息,建立冻害指标的空间分析模型,采用GIS技术推算出1km×1km分辨率的冻害指标空间分布;并根据香蕉冻害分级指标,通过GIS的空间分析能力,分析了广西香蕉低温冻害的空间分布特征。     

论静脉产业的法律调整

从静脉产业的概念入手，通过一系列的数据反映我国特别是河北省在工业固体废物、建筑垃圾、报废的机动车船、废旧家电、城市生活垃圾等静脉产业的实际状态和水平，并且探讨了调整静脉产业的现有法律制度及立法空白，提出了尽快出台《循环经济法》；修订《清洁生产促进法》和《固体废弃物污染防治法》；加紧制定《促进容器与包装分类回收法》、《家用电器回收法》、《建筑及材料回收法》、《食品回收法》、《垃圾回收利用法》及《绿色采购法》等立法建议。     

Inhibitory effects of butyrate on biological hydrogen production with mixed anaerobic cultures

In this study batch experiments were conducted to investigate the inhibitory effects of butyrate addition on hydrogen production from glucose by using anaerobic mixed cultures. Experimental results showed that addition of butyrate at 4.18 and 6.27 g/l only slightly inhibited hydrogen production, and addition of butyrate at 8.36-12.54 g/l imposed a moderate inhibitory effect on hydrogen production. At addition of 25.08 g/l, butyrate had a strong inhibitory influence on substrate degradation and hydrogen production. The distribution of the volatile fatty acids produced from the acidogeneisis of glucose was significantly influenced by the addition of butyrate. The inhibition of butyrate addition on hydrogen production was described well by a non-competitive and non-linear inhibition model, with the maximum hydrogen production rate of 59.3 ml/g-SS/h, critical added butyrate concentration of 25.08 g/l, and inhibition degree of 0.323, respectively. The C(I,50) values (the butyrate concentration at which bioactivity is reduced by 50%) for hydrogen production rate and yield were estimated as 19.39 and 20.78 g/l of added butyrate, respectively.     

油气长输管道工程HSE评价技术研究

根据油气长输管道系统的结构特点和作业特性,介绍了油气长输管道工程中职工健康、安全、环境(HSE)评价技术的基本理论和内涵以及进行评价的必要性、目的和意义、特点、适应性等,提出了一种新的集安全、环境、健康于一体的评价技术,为建立油气长输管道长期有效的保障技术体系及确保管道安全、平稳、高效运行提供了理论和技术支持。该技术在油气管道风险分析中具有较高的工程实用价值。