回流污泥曝气再生在污水处理厂升级改造中的应用

太湖流域无锡某污水处理厂在升级改造工程中采用了回流污泥曝气再生技术,介绍了其技术原理、改造措施与流程以及再生池设计.监测数据表明,该工艺运行稳定可靠,出水水质稳定达到<城镇污水处理厂污染物排放标准>(GB18918-2002)的一级A标准.结合实际工程运行情况,对回流污泥曝气再生技术在城市综合污水处理升级改造中的应用进行了研究探讨,对同类型城市综合污水处理工程有一定的借鉴意义.     

五座实验桥视角下的数字建造模式思考与策略选择

通过五座实验性数字建造步行桥的设计推演和技术解析,研究了思考模式、策略选择和技术整合在设计建造一体化工作流程中的重要性,探讨了数字建造在建筑形式之外对未来建筑发展的意义,尤其是建造模式升级为建筑工业化带来的影响.五座实验性人行桥均使用了新型材料、工艺和建造方式,融合了数字设计技术和优化实现技术,展现了新型工艺探索和具体工艺约束下对建造策略的思考,得出了数字工艺在建筑表达中的内蕴化策略.同时,对传统建造工艺的效率进行了再思考,展示了数字建造技术对传统工艺升级的重要意义.     

传统活性污泥工艺升级改造的设计优化研究

应用系统分析方法和ASM2d活性污泥模型模拟技术,对包头市北郊水质净化厂传统活性污泥工艺的升级改造方案进行了优化设计。通过系统分析进水和出水水质、运行参数及活性污泥降解性能来寻求升级改造中的关键因素,并在此基础上选定改良A2/O与深度处理(高密度沉淀池/微滤)组合工艺作为该厂的升级改造工艺,同时建立改良A2/O工艺模型,对不利温度(12℃)下的不同运行工况进行了模拟预测,并最终确定了最佳的污泥浓度、污泥回流量、内回流比、生物池溶解氧浓度等关键性技术参数值,为污水处理厂的升级改造和扩建方案提供了可行性预测和优化设计。     

旁通管定压在供热系统不同输配工艺中的应用

本文详细阐述了旁通管定压技术的原理,举例说明了在集中循环泵工艺和分布式变频工艺中的应用优势和局限。希望对设计、建设、运行管理、改造升级供热系统的相关人员都有参考价值。     

超薄沥青碎石复合面层工艺在机场跑道中的应用

结合巴布亚新几内亚Girua机场升级改造工程实例,从基层处理、材料准备、施工技术要点等方面,介绍了沥青碎石复合面层在机场跑道中的应用,比较分析了该工艺的优缺点,以供类似工程参考。     

采用HYBASTM工艺升级改造传统活性污泥工艺

简要回顾了流动床生物膜（MBBR^TM）工艺开发以来在世界各地的应用,重点介绍了采用MBBR^TM工艺与活性污泥工艺有机结合的流动床生物膜-活性污泥复合工艺（HYBAS^TM）在美国Broomfield市政污水厂的升级改造中取得的除磷脱氮经验和改造效果.     

ECOSUNIDE工艺在德州污水处理厂升级改造中的应用

通过ECOSUNIDE工艺在德州污水处理厂的应用研究,印证该工艺是一种污水高效生物处理工艺,它与现有的除磷脱氮技术相比,具有短时高效、工艺简单、占地和建设投资省、运行费用低等特点,在城市污水处理领域内特别是增加除磷脱氮功能的升级改造中具有广泛的实用性和经济性。     

道路桥梁施工中预应力的应用及存在的问题

随着经济社会的转型升级，建筑工业得到了快速发展，在道路桥梁建设中，预应力技术得到了良好的应用。但在预应力技术应用中，还存在一系列问题，比如管道堵塞问题、张拉工艺问题等，需要给予足够重视。本文就在对道路桥梁施工中预应力技术介绍的基础上，分析了其应用方法和存在的问题。     

数学模拟在污水处理厂节能减排中的应用和发展

在国内外节能减排的大背景下,污水处理厂面临着巨大的提标改造和节能减排压力。基于活性污泥数学模型的数学模拟技术在国内外许多污水处理厂的模拟仿真、运行诊断与工艺优化、升级评估、节能减排等方面得到广泛的应用,文章主要介绍了数学模拟技术在污水处理厂节能减排方面的发展和应用情况,并提出今后国内的主要研究方向。     

MBBR工艺用于无锡芦村污水处理厂的升级改造

介绍了MBBR工艺在无锡芦村污水处理厂升级改造中的应用情况。该升级改造工程规模为20×104m3/d,分三期依次改造,主体改造工艺采用A2/O投加悬浮填料工艺(即MBBR工艺),出水水质稳定达到一级A排放标准。     

门站调压系统自动识别选路装置的设计

介绍了天然气门站调压系统中自动识别选路装置的设计原则,探讨了自动识别选路装置的结构及控制过程。当运行路超压切断或不能满足下游用气时,备用路能自动启动供气。当运行路超压时,运行路紧急切断阀关闭,而备用路紧急切断阀不动作。     

The Bacterial Quality of an Upland Stream

Faecal coliform concentrations were determined at stream and water inflow sampling sites within an upland catchment in North Derbyshire containing rough, semiimproved and improved pastures. The results indicated that, during its passage through the catchment, the faecal indicators of the stream increased, and this may constitute a health risk to cavers using a popular recreational cave into which the stream drains. The decline in streamwater quality suggests that a semipermanent store of bacteria existed in catchment soils, and hydrological processes operated to transfer bacteria from the land to the stream channel. Contrary to expectations, intra-catchment differences in the bacterial quality of water at inflow and stream sampling sites could not be related to the intensity of agricultural land use in adjacent areas. This is explained with reference to changes in the nature of hydrological transport pathways associated with the improvement of pastures.     

与地域文化相融合的溪流景观设计

从地域文化角度出发,分析了影响溪流景观地域性特色的因素,探讨了基于场地自然特征、人文特征、周边环境彰显溪流景观地域文化的设计方法,从而营造独具地域特色的溪流景观。     

博物馆建筑室内无障碍流线的评价

论文通过比较国内外无障碍设计规范的区别,指出能形成完整无障碍流线的建筑及其室内外环境是推动我国无障碍环境建设的最终目标,提出博物馆建筑室内公共空间的无障碍流线设计主要包括室内交通空间、室内功能空间和室内标示导向系统三个部分。在此基础上,运用GCAHP方法构建了博物馆建筑室内无障碍流线的评价体系,确定了各指标的评分办法。最后以南京博物院为案例进行实证分析,验证了该评级体系的可操作性,以提高我国公共建筑无障碍环境设计的水平。     

Building Watershed Narratives: An Approach for Broadening the Scope of Success in Urban Stream Restoration

The success of urban stream restoration is often measured through biophysical attributes, or the progress towards restoration of a notionally intact section of landscape. What remains understudied is how success can be defined across social, economic, as well as ecological parameters. This research offers a narrative approach for urban restoration research that serves as a chronotope for untangling the biophysical and sociocultural complexities of the contemporary urban environment. The framework of this approach is presented through a case study of a recent stream restoration project in Seattle, Washington. The findings highlight the need for urban stream restoration processes to be grounded within a sociocultural context that is interdependent with biophysical conditions, and recommends measures of project success to include community, educational and participatory goals.     

Stream productivity analysis with dorm—I: Development of computational model

A numerical dissolved oxygen routing model (DORM) is developed to determine total stream community photosynthesis (P) and community respiration rates (R) through iterative routing of two-station diel DO measurements. The model differs from existing procedures for diel curve productivity analysis; it uses the complete stream DO transport equation, including longitudinal dispersion, dependence of respiratory rate on water temperature and dissolved oxygen and wind dependent oxygen transfer through the water surface. The model, DORM, is more accurate than the traditional graphical procedures of diel curve analysis and is simple to apply. DORM is also valuable in an analysis of the results' sensitivity to the numerous coefficient and parametric assumptions required in diel curve analysis. The model is not a predictive DO model, but is designed for the interpretation of DO measurements in a stream, channel or river.     

武夷山九曲溪水资源

本文在分析流域中森林水文作用的基础上,从整个流域分析九曲溪在洪水期的水量骤增与枯水期水量骤减的主要原因,以区域可持续发展理论为指导,提出九曲溪水资源保护的有效措施。     

黄浦江上游水源地的水环境特征及保护对策

黄浦江上游江段是上海市最大的供水水源地，确保其水量和水质对于保障上海市的饮用水安全有着十分重要的意义。为此，重点分析了黄浦江上游可利用水资源的组成和近十年来的水质变化趋势，以及上游主要水功能区的水质现状和入河排污量，并提出了水环境治理、引清调水、水功能区管理、保护规划、信息预警等水源地保护对策。     

Stream productivity analysis with dorm—II: Parameter estimation and sensitivity

The dissolved oxygen routing model DORM, which determines productivity and respiration of a stream biological community, requires in addition to stream geometry and stream flow, parameter values for reaeration coefficients and temperature and dissolved oxygen (DO) limitations on respiration. Illustrated are the methods used to obtain numerical values in a field study at the U.S. EPA Monticello Ecological Research Station. The calculated community productivity and respiration rates are sensitive to certain input parameters and assumptions. Analysis showed that, among the many parameters needed, hydraulic residence time and reaeration coefficients should be determined with utmost care. Other sensitivity tests included temperature effects, half-saturation values and longitudinal dispersion.     

Fluorescein and Poly(Ethylene Oxide) Hose Stream Additives for Improved Firefighting Effectiveness

A novel technique has been developed to accurately monitor levels of hose stream additives by adding a fluorescein tracer. A fluorescent agent system is proposed to control and monitor additives into hose streams. Fluorescent water streams also have the advantage of improved nighttime and low-light visibility.Poly(ethylene oxide) (PEO) was shown in the 1960s to be very effective in fire hose streams, providing dramatic increases in hose stream pressure, reach, and volume. As is discussed in this paper, however, PEO fell into disrepute for firefighting operations. A reexamination strongly indicates the inaccuracy of previous misperceptions and indicates that PEO deserves reconsideration as being potentially powerful for greatly enhanced petroleum, ordnance, high-rise and impeded access firefighting, in which increased stand-off distances are desirable.