城市中水回用于火电厂循环冷却水的设计方案

本文主要根据安徽省淮北市建委的要求,将已建的一、二期污水厂出水新建回用工程,充分利用水资源,开辟市内第二水源,达到节能减排的目的。首先对现有污水处理厂进行升级改造,对一期污水厂扩建缺氧池、厌氧池和改建活性污泥回流系统,出水达到《城镇污水处理厂污染物排放标准》的一级B标准。再根据电厂和城市杂用水对水质的不同要求,进行再生回用分质处理。出水达到一级A标准和电厂再生补充水水质指标。     

污水净化公司中水回用工程介绍

介绍了某市污水净化公司中水回用工程的设计内容，对污水处理厂的二级处理出水进行深度处理后回用于工业用水进行了探讨，经运行证明，该技术具有明显的社会效益和经济效益。     

秦皇岛港开展污水再生回用的实践

2002年3月秦皇岛港务集团公司投资850万元在东港区二级污水处理厂附近建成了污水再生回用工程(一期),采用生物陶粒滤池工艺,以二级处理出水为原水,出水全部用于东港区煤场除尘、绿化等,回用水量达1.0×104m3/d。该项目在实施过程中获得了秦皇岛市政府的有力支持和多项优惠政策,如10年内免收污水再生水厂土地使用费,无偿将现有东港区二级处理厂清水池改造成再生水厂清水池、调节池、消毒接触池,节省了大量土建费用等。另外,政府促成了再生水厂与工业用水大户———市热电厂、中阿化肥厂等达成再生水使用协议,开发了回用水市场,为二期工程奠定…     

开发区污水处理组合工艺系统及尾水再生回用

为解决苏州市某工业开发区内食品及印染织机废水水质复杂、建设用地受限、资金少等难题，污水处理厂设计建设了两套相对独立、单元构筑物管线又可灵活进行调度的工艺方案。两套废水处理主体单元均为厌氧水解池+一体化AAO生化沉淀组合池+絮凝沉淀池+滤布滤池，其中通过前置气浮池对印染喷水织机废水中的油状乳浊液进行预处理。该污水厂设计规模为3×10⁴m³/d，出水水质指标全面达到《太湖地区城镇污水处理厂及重点工业行业主要水污染物排放限值》(DB32/1072—2018)中太湖流域一、二级保护区内主要水污染物排放限值要求，达标尾水再生回用于开发区内喷水织机生产过程。通过尾水的再生回用，不仅缓解了市政管网的供水压力，降低了企业的生产成本，同时也吸引了相关用水需求的企业入驻，具有一定的示范效应。     

天津开发区"双膜法"污水再生回用工程

介绍了天津开发区污水再生回用工程的工艺流程、特点及运行效果。该工程以污水处理厂二级出水为原水,采用“双膜法”(CMF RO)进行深度脱盐处理,出水水质优于WHO和USEPA的饮用水水质标准,可广泛回用为工业纯水、工业冷却水、园林绿化及市政生活杂用水。     

曝气生物滤池工艺再生水厂工程改造

秦皇岛港务集团公司再生水厂处理水量为1×104m3/d,采用曝气生物滤池/纤维球过滤工艺对污水处理厂二级出水进行再处理,处理出水回用于港区除尘.由于原有工艺和构筑物设计方面的问题,运行不稳定.通过对工艺流程、反冲洗配水系统、加氯方式进行改造,避免了滤层堵塞,提高了出水水质.     

青岛海泊河污水处理厂污水回用工程

１工艺简介青岛市海泊河污水处理厂建于１９９３年，二级处理工艺为ＡＢ法即两段活性污泥法。１９９９年２月１０日，该厂污水回用工程试车成功（以二级处理后的出水为污水回用工程的进水水源）。１１工艺指标根据青岛市节水办等单位调查，经海泊河污水处理厂污水回用工...     

BAF/转盘滤池用于城市污水处理中水回用工程

在秦皇岛市污水处理厂升级改造工程中,深度处理采用曝气生物滤池/机械混合反应/纤维转盘过滤工艺,并将出水作为再生水回用,设计规模为4×104m3/d。结合厂区现状条件和处理要求,详细介绍了中水回用工程的工艺流程和设备参数。出水经紫外消毒后水质稳定达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。     

高密度沉淀池+V型滤池工艺的再生水厂设计

邯郸市第一座再生水厂是以东污水处理厂二级出水为原水,采用"高密度沉淀池+V型滤池"处理工艺,设计总处理规模为6万m3/d。出水主要回用于城市杂用水及景观环境用水,部分回用于工业用水。介绍了工程的设计与运行情况,着重介绍了高密度沉淀池的设计参数与构造。运行结果表明,工艺运行情况稳定,出水水质达到设计要求。     

制革废水处理厂及下游综合污水厂升级改造探究

对某制革废水处理厂和下游综合污水处理厂的进出水水质和沿程工艺段进行采样分析,得出制革废水处理厂出水NH3-N和TN平均浓度分别为77. 32、160. 93 mg/L,综合污水处理厂出水COD平均浓度为106. 8 mg/L,其中大部分是难降解COD,出水TN平均浓度为89. 93 mg/L,出水COD和TN是影响污水处理厂出水达标排放的主要指标。在小试中投加500 mg/L葡萄糖(以COD浓度计)时脱氮效果明显增强,综合污水处理厂出水TN浓度可稳定在15 mg/L以下。利用臭氧、活性焦和四相催化氧化深度处理综合污水处理厂二级出水,发现臭氧对COD基本没有去除效果,活性焦和四相催化氧化都能使COD浓度降至50 mg/L以下,但四相催化氧化去除单位COD的成本约是活性焦的29%、再生活性焦的49%。     

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。     

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。     

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…     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。     

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.