水库水中微囊藻毒素的预氧化处理

研究了二氧化氯和臭氧预氧化对水库中微囊藻毒素的处理效果。结果表明，二氧化氯对藻毒素的去除能力有限，而臭氧能有除去除含藻水中的藻毒素。     

次氯酸钠对微囊藻毒素释放及降解特性的研究

选用铜绿微囊藻为处理对象,研究了NaClO在藻类处理过程中藻毒素释放和降解的特性。结果表明：NaClO作用于藻细胞后会破坏其完整性,导致藻毒素释放,同时次氯酸钠投加量及藻浓度对藻毒素释放及降解量有较大影响。应避免在藻类大量暴发时（藻浓度〉6．96×10^6个／mL）预氧化中使用次氯酸钠,而在一般藻细胞浓度较低的水厂采用该种预氧化方法除藻,不会造成藻毒素的释放扩散。     

高锰酸钾强化混凝工艺对受污染地表原水中藻类和藻毒素的去除效能研究

对高锰酸钾强化混凝工艺去除藻类和藻毒素的效果分别进行了实验室烧杯试验和水厂现场生产性试验研究。研究结果表明高锰酸钾预氧化能够强化常规工艺的混凝过程,对藻和藻毒素的去除率有较大提高,同时对浊度和高锰酸盐指数等常规指标的去除也有显著改善,是水厂预氯化工艺的理想替代工艺。     

针对高藻源水的农村分散式饮用水处理技术研究

当源水水质恶化时,由于受技术、经济条件的限制,农村分散式净水工程的出水水质往往难以达标.研究了单一超滤膜、人工湿地/超滤膜、生物接触氧化/超滤膜及人工湿地/生物接触氧化/超滤膜工艺(分别记作系统I～Ⅳ)对太湖高藻源水的处理效果.结果表明,与其他3个系统相比,人工湿地/生物接触氧化/超滤膜组合工艺对COD<,Mn>TN、NH<'+><,4>-N、TP、TMC-LR(总藻毒素)及EMC-LR(胞外藻毒素)的去除效果最佳,对浊度、叶绿素a及IMC-LR(胞内藻毒素)的去除率则无显著差异(P>0.05),在出水水质满足<生活饮用水卫生标准>(GB 5749-2006)的同时还能有效解决超滤膜污染的问题,降低了运行成本.     

控制饮用水原水中藻类、藻毒素的水厂处理工艺

介绍了国内外对原水中藻类、藻毒素的去除方法,其中对藻类及其胞内藻毒素的去除主要有预过滤、强化混凝、气浮等技术,对细胞外溶解性藻毒素的去除主要有生物预处理、活性炭吸附、膜过滤、臭氧及紫外线等高级氧化工艺。通过分析这些工艺的优缺点及研究进展,提出了一些可行性优化组合方案并展望了可能的发展方向。     

源水中藻毒素污染的探讨

对某市源水中的藻毒素高发期、藻毒素的分布、藻密度作了分析，并探讨了藻毒素浓度和藻毒素产经与水中氮、磷浓度的关系，以及常规水处理工艺对藻及藻毒素的去除率。     

不同水处理工艺流程对除藻效果的影响

为了解和考察不同处理流程、各种预氧化剂的除藻效果及对除藻特性的影响，首先研究了春季天津市“引黄”原水藻类的数量与分布特征，发现该季节优势藻为小球藻、绿梭藻和栅列藻。对比了预氯化沉淀、单独气浮、预臭氧化气浮和高锰酸盐复合药剂(PPC)预氧化气浮工艺的除藻效果和除藻特性。结果表明各种工艺流程的除藻特性有明显差异，采用气浮工艺代替沉淀工艺能够提高对原水中不同优势藻的去除率，预臭氧化和PPC预氧化能够进一步提高气浮工艺对优势藻的去除率。PPC预氧化去除小球藻更有效，而预臭氧化去除绿梭藻和栅列藻效果更好。预臭氧化和PPC预氧化能够提高气浮工艺去除叶绿素a的能力。     

给水处理中藻类去除的方法

饮用水源由于富营养化而导致水体中藻类大量繁殖是影响净水厂工艺正常运行及出厂水质的一个突出问题,介绍了国内外除藻技术研究进展.通过分析各种除藻工艺的除藻效果,认为生物处理法及其组合工艺可有效去除藻类、藻毒素,出水稳定,水质安全性高,应用前景广阔.     

气浮/微絮凝/臭氧/活性炭工艺除藻效果

研究了臭氧—活性炭过滤对含藻水库水中藻类和微囊藻毒素的处理效果。中试结果表明，气浮／微絮凝／臭氧／活性炭工艺可有效处理受藻类污染的水库水。     

膜生物反应器启动阶段除藻效果研究

以人工配制的含藻原水为处理对象,比较了UF工艺、生物粉末活性炭+UF组合工艺的除藻效能。结果表明,在膜生物反应器启动阶段,生物粉末活性炭+UF组合工艺对藻类、叶绿素a、藻毒素的去除效果高于UF工艺;生物粉末活性炭形成后,组合工艺对MC-RR、MC-LR的平均去除率达到96.0%和85.2%,能去除全部的藻类和叶绿素a,是较为理想的除藻工艺。     

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.