天津市杨柳青水厂升级改造方案研究

杨柳青水厂常规处理工艺系统运行超过30年,在供水水质和供水安全性方面均存在一定的安全隐患,且产水能力有限,水厂供水区域较小,供水管网相对独立。为满足供水需求,有必要对杨柳青水厂进行升级改造。基于杨柳青水厂的实际生产情况,考虑到天津市自来水集团对该厂的定位(试验型水厂),提出了浸没式膜处理系统改造方案,该方案的实施能够进一步提升供水水质,更好地保证安全供水、优质供水,实现运行全自动控制及现代化管理,确保水厂供水的稳定、安全可靠性。     

上海松江二水厂的深度处理改造及运行效果

由于原水水质不稳定,松江自来水公司二水厂亟需实施深度处理改造以保证出厂水水质达标。该厂创造性地将原有平流式沉淀池进行改造,克服了厂区用地紧张、电力容量不足等诸多难题,在常规处理工艺基础上新增O3—BAC深度处理工艺,最终使出厂水水质达到了《生活饮用水卫生标准》(GB 5749—2006)。     

超滤膜技术在宁波市江东水厂升级改造中的应用

为改善饮用水水质,保证供水安全,宁波市江东水厂采用热法PVDF超滤膜技术对该水厂二期、三期工程的饮用水常规处理工艺进行了升级改造。该升级改造工程将原有虹吸滤池改造为浸没式超滤膜池,最大限度地降低工程造价,同时能保证出厂水水质满足《生活饮用水卫生标准》(GB 5749—2006)。改造完成后,该厂供水量达到20×104m3/d,为大型水厂的膜法水处理建设提供了宝贵的经验和借鉴。     

MIEX艺在水厂深度处理中的应用研究

淮安自来水有限公司北京路水厂是在上世纪70年代建成的日供水量97Ym。的水厂,水厂水源取自洪泽湖下游二河水,主要工艺为混凝沉淀＋砂滤＋消毒;根据水源水质、现有工艺以及水厂的占地情况,通过对各种深度处理工艺的试验和研究,淮安自来水有限公司于2011年2月确定选择占地面积小、出水水质优、操作维护方便的磁性离子交换树脂（MIEX㈤）深度处理工艺用于该水厂的深度处理;水厂从2011年8月开工进行深度处理工程改造,于2012年6月25日调试通水成功,MIEX工艺的设计通水倍数为800BVTR;改造后的水厂处理工艺为：MIEx＋混凝沉淀＋砂滤＋消毒;MIEX系统运行后大大提高了水厂的产水水质、降低了后续工艺的加药量并降低了供水中的消毒副产物;改造后该水厂COD。去除率为60％,消毒副产物降低80％;使该厂出厂水满足国家新的《生活饮用水卫生标准》（GB5749—2006）的要求。     

提高虹吸池过滤效果改造方法的技术实践

介绍了针对水厂虹吸滤池的工艺改造,应用短柄滤头、长柄滤头、直滤式滤板等新的冲洗配水方式的技术方法和工程方案。改造取得良好的运行效果,过滤效率和水质提升,可为同类水厂的工艺改造工作提供参考。     

工业给水厂处理工艺改造

为扩大生产规模和提高出水水质,重庆市某工业给水厂对原处理工艺进行了改造,采用网格絮凝/平流沉淀/斜管沉淀工艺处理长江原水。实践结果表明,该厂制水能力增加了7.5×104m3/d,出水浊度3 NTU,达到了设计要求。     

典型自来水厂制水能力挖潜评估研究与实践

南方某水厂设计产水规模为15×104m~3/d,因用地条件所限,已不具备原地扩建可能,为应对逐年增长的城市用水需求,对该水厂制水能力进行了深入评估,挖掘现有水处理构筑物潜力,充分利用设计冗余,并结合实际实施局部改造,达到水量提升的目标。实践证明,该厂产水量可以提高至18×104m~3/d,改造后水质稳定达标。根据该案例总结出一套针对常规工艺水厂的产能评估与挖潜的方法,为缓解自来水供需矛盾提供了新的思路。     

浸没式超滤膜技术在水厂升级改造中的应用及设计

针对老旧水厂出水水质不稳定的问题及现有水厂升级改造的必然态势,以实际水厂改造方案为案例,对浸没式超滤膜系统的设计与应用进行详细阐述,总结出该改造工程具有流程短、通量小、占地面积小等特点。最后结合实际运行情况,对设计中包括设计通量、单格膜池规模和尺寸等的关键性参数及产水形式等关键问题进行分析探讨,为该技术用于水厂的升级改造提供技术参考与设计运行经验。     

拱北水厂12万m~3/d制水流程阀门改造

<正> 拱北水厂是珠海市城市供水的主力水厂,该厂的供水量约占市区供水量的60%。该厂制水流程于1993年建设完成投入生产。由于城市发展迅速,用水量大增,近5年来,该流程超负荷生产,日制水量达到20万m~3。目前该流程选用的阀门使用时间长久,漏水严重,导致给水处理过程中水损较大。在水资源日益紧缺,咸潮问题日益突出的今天,在保证水质的前提下,如何降低制水流程的水损,进行节水改造显得尤为重要。 1、设计规模为 12万m~3/d的制水流程运行简述     

肇庆高新区水厂超滤膜法升级提标改造示范工程

为改善饮用水水质和提高水厂产水能力,肇庆高新区粤海水务水厂采用PVC合金超滤膜技术对该水厂一期工程的常规饮用水处理工艺进行了升级提标改造。该提标改造示范工程将原有无阀滤池改造为浸没式超滤膜池,可以最大限度地降低工程造价,同时能保证出厂水水质满足《生活饮用水卫生标准》(GB 5749—2006)要求。     

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.     

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。     

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。     

Experiences in radon-safe building in Finland

A study was made of radon-safe buildings in 300 Finnish low-rise residential buildings using data obtained from a questionnaire study. The study also aims at finding the main defects in design and implementation and how the guidance given on radon-safe buildings in slab-on-grade houses has been followed. According to the guidelines, the prevention of the flow of radon-bearing air from the soil into the house is recommended to be carried out through installation of aluminised bitumen felt and use of elastic sealants. Second, as a precaution perforated piping should be installed in the subsoil of the floor slab. The median indoor radon concentration in the houses was 155 Bq/m3. This is 32% lower than the median of the estimated reference values. The action level of 200 Bq/m3 was still exceeded in 40% of the houses. In most houses with slab-on-grade the prevention was based only on the installation of a sub-slab depressurisation system. Sealing was performed in a low number of houses. In 80% of houses with a sub-slab piping connected to an operating fan, radon concentration was below the action level of 200 Bq/m3. In houses with piping but no fan, the corresponding fraction was only 45%. Sub-slab piping without a fan had no remarkable effect on radon concentration. In houses with crawl-space and edge-thickened slabs, radon concentrations were low. The choice of foundation system thus significantly affects the indoor radon concentration. The importance of complete and careful sealing work should be stressed in advice and guides concerning radon prevention.     

2008年日本火灾情况

<正>1火灾总数在2008年(1～12月),日本发生的火灾总数为52 394起,与2007年相比减少了2 188起(4.0%)。这相当于平均1天大约发生143起火灾,每10min发生一起火灾。火灾类别(见表1)。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.     

谈城市历史保护规划的误区

由于缺乏起码的历史文化知识,忽视历史文化遗产的保护,错误的决策导致了建设性的破坏,要加强城市保护的教育,培养合格人才。