剪力和弯矩的计算规律

总结出梁发生平面弯曲时,用截面法计算梁中指定截面的剪力和弯矩的一些规律．     

UASB工艺处理木薯酒精废液生产运行发现

论述了总有效容积2000m3的新型UASB装置,在中温条件下处理高浓度木薯酒精废水的启动运行和污泥含量控制的过程．当反应器稳定运行时,容积负荷可达7kgCOD／（m3·d）,水力停留时间为2d,污泥保持量在30％-41;％,COD去除率达95％以上,出水COD小于500mg／L．     

污泥处理与处置技术研究进展

我国每年产生大量的污泥,污泥问题已经成为我国当前面临的一个严重的环境问题。本文综述了污泥处理与处置技术的现状,总结了该领域内新技术的应用,展望了污泥处理与处置技术的发展趋势,并提出了相关建议。     

Combined process of sequencing batch reactor activated sludge process and constructed wetland for domestic wastewater treatment

By combining sequencing batch reactor （SBR） activated sludge process and constructed wetland （CW）, this study is to achieve the domestic wastewater treatment. Our purpose was to determine the optimum operating parameters of the combined process. The process involved advantages and shortages of SBR and CW. Under normal temperature, the 3rd cycle （SBR’s operation cycle is 8 h： inflow for 1 h, limited aeration for 3 h, sediment for 1 h, outflow for 1 h, and idling for 2 h; CW’s hydraulic retention time （HRT） is 24.8 h and hydraulic loading is 24.5 m^3/m^2 d） was the best cyclic mode. The effluents can meet the standard GB/T18921-2002： “The reuse of urban recycling water： water quality standard for scenic environment use”. In the 3rd cycle, the efficiency of CW was the maximum, and energy consumption of SBR was the minimum. Under the condition of low dissolved oxygen, the removing efficiency of chemical oxygen demand （COD） and ammonia was not affected obviously. Simultaneously, nitrification and denitrification phenomena occured and phosphorus was absorbed obviously.     

小麦秸秆常压浓硫酸水解工艺条件研究

本文通过单因素实验和正交实验研究了小麦秸秆常压浓硫酸水解糖化规律,优化酸解糖化工艺条件。实验结果表明常压浓硫酸水解较优工艺条件为:硫酸浓度为64%,酸固比为25∶1,水解温度为60℃,水解时间为50min,总糖收率最高可达36.22%。     

Technological feasibility of biodiesel production from bioaugmented hydrolysate of waste sludge in a municipal wastewater treatment plant

The hydrolysate of waste sludge was used as the feedstock of biodiesel production, and its technological feasibility was investigated. Waste sludge, collected from No.3 Municipal Wastewater Treatment Plant of Xi＇an, was hydrolyzed in two parallel reactors firstly. Yeast was added into one reactor for bioaugmentation, and the other reactor without yeast was used as a control. Then an acid-catalyzed in situ esterification process was carried out to convert the hydrolysate to biodiesel. The results of hydrolysis showed that the reactor bioaugmented with yeast could promote hydrolysis compared with the control one because of an obvious variance in total suspended solid （TSS）, volatile suspended solid （VSS） and soluble chemical oxygen demand （SCOD）. Furthermore, gas chromatography （GC） analysis exhibited that the total volatile fatty acid （VFA） was low in the hydrolysate of bioaugmentation reactor; however, its yield of the fatty acid methyl esters （FAMEs） by in situ esterification was obviously higher when compared with the control one. Therefore, it may be inferred that the hydrolysate of bioaugmentation was mainly inclined to longer-chain fatty acid rather than to VFA. Anyway, an FAMEs yield of 9.24% （wt%） from dried sludge was attained after the 12-d bioaugmentation hydrolysis and succedent esterification. This value was not only higher than that of the control one but also higher than that reported in previous literature. The above results illuminated that it was feasible to produce biodiesel from the bioaugmented hydrolysate of waste sludge.     

城市污水厂污泥处理与资源化

城市污水污泥产量巨大且污泥成分复杂．若污泥处理处置不当,不仅会对环境造成二次污染,同时也是对资源的一种浪费．目前,污泥处理处置问题已成为全球环境保护面临的主要难题．本文介绍了城市污水厂污泥来源与组成、污泥危害、污泥处理与资源化的基本方法、处理技术和污水处理厂污泥处理处置现状,进而针对存在问题提出了污泥处理和处置的建议,使污泥的产生、处理、处置和环境保护之间达到一个良好的平衡．     

膜蒸馏海水脱盐技术研究进展

发展海水淡化、浓盐水综合利用技术已被《国家中长期科学和技术发展规划纲要（2006-2020年）》列为“亟待科技提供支撑”的国民经济和社会发展重点领域的优先主题以及《国家“十一五”科学技术发展规划纲要》的重点任务之一,成为从根本上提高我国水资源保障能力的最有效的途径之一。膜蒸馏是一种结合了蒸发过程的膜过程,是一种新型的具有市场潜力的膜技术。本文对膜蒸馏的技术原理、研究进展,特别是在海水淡化与浓海水资源化方面的研究进展进行了总结阐述。     

SBR工艺在处理模拟制革废水中运行参数的优化

在处理制革废水中常用SBR工艺,试验探讨了不同HRT、进水pH、COD负荷、NH3-N浓度、活性污泥浓度的运行参数,研究SBR工艺处理制革废水的最优运行参数．结果表明：SBR反应器在进水COD为1500～2000mg／L、NH3-N为150～250mg／L、pH为7．5、运行污泥浓度在3．0g／L左右、曝气时间为18h时COD去除率能达到95％左右,NH3-N去除率达到97％左右,其出水能够达到一级出水标准．     

基于区位熵指数的西安市现代服务业集聚区研究

集聚度能够反映行业的区域竞争优势。利用区位熵指数的方法对西安市2007—2009年7个现代服务业集聚区的集聚度进行测算,结果表明:最近3年西安市7个现代服务业集聚区都出现明显的产业集聚特征,其中区域性的会展中心、高新中央商务区、盛唐文化曲江新区的产业集聚度较高,集聚度增长趋势明显,发展状况良好;专业化特色大市场、商贸集聚区的专业化程度和竞争力水平略高于西安市同类产业的平均发展速度,但集聚度增长幅度不大,需扩大发展规模;现代物流产业集聚区和新北城商务中心的产业集聚度较低,需加大投资力度。