基于Anammox的新型A~2O工艺及优势分析

目前,大多数城市污水处理厂仍采用传统的活性污泥法工艺进行城市污水处理,该工艺需要使用大量的化学药剂来提高污水处理中的脱氮效果,导致污水处理效率降低、能耗增加。为了解决该问题,基于Anammox技术对传统的活性污泥法工艺进行了改良,在工艺流程中使用厌氧池、好氧池和厌氧氨氧化池替代曝气池,使用亚硝酸处置工艺完成污水脱氮,分析表明,新型的活性污泥法工艺能够有效提高污水处理的脱氮性能,降低能耗。     

某厂区污水处理站升级改造设计分析

北京某厂区污水处理站原有污水处理工艺出水水质,达不到北京市新的污水排放标准,主要为氨氮和总磷超标。为强化二级处理生物脱氮除磷效果,通过对现有各种脱氮除磷处理工艺进行分析和比较,选定升级改造后的污水处理工艺流程为:污水+格栅+隔油沉淀池+—级浅层气浮池+二级浅层气浮池+缺氧反应池+好氧反应池+MBR池+化学除磷池+折点氯化反应池+砂滤罐+紫外线消毒。该污水处理站运行两年多来,出水水质稳定,氮、磷排放达到北京市新的污水排放标准要求,可为一些中小型污水处理站升级改造设计提供参考。     

锦州石化公司炼油污水装置生化处理技术改造

对锦州石化炼油污水处理装置问题进行分析,通过采用序进气浮和精除油工艺除油,生化缺氧池改为悬浮污泥回流工艺,一级和二级好氧池改为MBBR工艺,大大地降低了外排水或污水回用水质污染物浓度,石油类去除率为97.5％,CODCr去除率为96.5％,氨氮去除率为97.3％,满足了辽宁省DB 21/1627—2008《污水综合排放标准》中污染物的排放指标,同时也减轻污水回用的负担。     

曝气生物滤池的特点、应用及发展

曝气生物滤池是近年来国内外发展较快的一种废水好氧生物处理新工艺 ,该工艺具有处理能力强、处理效果好、不需二沉池等优点 .综述了曝气生物滤池的工艺原理、特点及其在污水处理中的应用及发展     

VERTREAT污水处理工艺几点优势

介绍加拿大诺曼 (NORAM )公司的VERTREAT污水处理工艺及其较传统污水处理工艺的几点优势。该工艺利用潜置于地下的竖向反应器对城市污水或工业废水进行超深水好氧生物处理 ,从普通深井曝气工艺的基础上进行了进一步的革新和优化改造 ,使反应池体积更小、氧的利用率更高。同传统污水处理工艺相比 ,具有运行费用低、耐冲击负荷能力强、较小的占地面积、对环境影响小等优点。     

最优需氧量精确控制在污水处理厂的应用

对污水处理过程中好氧段需氧量的控制进行了阐述,并介绍了一种基于模糊控制原理的最优需氧量控制系统。将该系统应用于某污水处理厂生物池,基本上能实现最佳供气量控制,达到了节能运行的效果。     

海绵城市背景下的城市污水处理问题及技术发展分析——以二沉池为例

从海绵城市背景出发,对城市污水处理的概况和发展进行概括与分析。对城市污水处理存在的总体性问题进行阐述,因处理系统的复杂性,选取污水处理环节中的二沉池作为研究对象,对其存在的问题以及未来展望进行分析研究。以二沉池的研究成果作为参考,引申出对未来城市污水处理的技术展望和发展,以期为城市水资源管理与利用提供经验和建议。     

某污水处理项目臭氧反应处理中试研究

以北方某制药有限责任公司布洛芬(OTC)生产的污水处理工程为例,通过中试试验,分析了臭氧加铁屑氧化技术对好氧池出水的处理效果,并采集了中试试验过程中的各种参数,为污水处理厂后期改造和调试设计提供了依据。     

初沉池在城市污水处理中的有效设置

分析了初沉池在城市污水处理中的重要作用，分析了不设初沉池可能产生的不良影响，提出城市污水处理系统应在符合现行设计规范前提下有效设置初沉池。探讨了处理低浓度城市污水及二级生物处理工艺的城市污水处理厂初沉池的有效设置。     

某制革园区污水处理项目改造设计实例

针对某制革园区污水处理系统不能满足一级A排放标准的问题,对现有污水处理系统进行整体改造。改造方案统筹布置事故水处理、混合水处理系统及中水回用系统,其中事故水处理系统采用粗格栅+提升泵站+事故水调节池+絮凝沉淀池+事故水储池;混合水处理系统采用预处理+絮凝初沉池+缺氧池+MBBR与PACT组合好氧池+二沉池+絮凝沉淀池+反硝化深床滤池+臭氧接触池工艺,出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A排放标准;中水回用系统对处理后达标水进行二氧化氯消毒,出水水质满足制革企业生产用水要求。详细介绍了污水处理项目的现状、设计水质、工艺设计方案、主要经济技术指标及调试运行等。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

2005年北京办公物业市场七大趋势

趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03～04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中…     

Developments in immersed tunnelling in Holland

Holland has 22 immersed tunnels (14 road, 5 rail and 3 utilities tunnels). Another three are under construction, and more are foreseen. The tunnels are of the concrete type, i.e., constructed without a steel shell. The paper describes developments in technology and in design philosophy since the first immersed tunnel was completed 52 years ago. These developments include, amongst others: the introduction of the Gina rubber gasket between elements; the division of elements into sections divided by flexible joints; the application (if possible) of longer elements (up to 268 m); the use of precast sections for tunnels that have a small cross-section; the omission of the watertight lining (made possible by cooling the concrete of the walls during the first days after pouring); various foundation methods (e.g., sand flow instead of sand jet system; piled foundations when necessary); the use of the excavation for the open ramps (or the part of the tunnel built on land) as a casting basin for the elements; the changed approach to casting basins now that well pumping is usually forbidden; and the transport of the elements across shallow locations and across the sea. It is emphasized that the current state of immersed tunnel technology is the result of a continuous international exchange of ideas and experiences.     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。