抚顺三宝屯污水处理厂DAT-IAT工艺设计

抚顺三宝屯污水处理厂一级处理规模为 5 5万m3 /d ,二级处理、污泥处理的处理规模为2 5万m3 /d。设计采用了先进的连续进水、连续并间歇曝气的序批式活性污泥法工艺 ,即DAT IAT工艺。全厂布置紧凑、自动化程度高。简要介绍了该工程的基本情况和设计特点     

上海市第二污水处理厂工程已正式开工

上海市第二污水处理厂工程已正式开工。该工程总投资达6亿元人民币,设计处理规模50万m3/d,计划于2005年底完成主体工程的建设,届时上海市污水处理率将增至70％。     

北京北小河污水处理厂改扩建及再生水利用工程介绍

北小河污水处理厂改扩建工程总规模10万m3/d,其中扩建工程6万m3/d,出水有5万m3/d直接回用,另外1万m3/d经反渗透(RO)处理后用作奥运公园水体补给水及场馆杂用水。这是目前国内市政污水处理中最大规模应用MBR工艺的工程。介绍了工程的主要设计参数及运行情况,重点对MBR工艺和RO工艺的处理效果、能耗情况进行分析。MBR工艺处理后出水水质优良,可直接达到回用标准,RO工艺生产的高品质再生水水质优异,在奥运期间起到了很好的示范作用。     

宜宾市高县第二城镇污水处理厂工程

正联系单位:高县供水公司项目内容:工程设计总规模20 000m3/d,厂外截污管道总长约15.4km,采用钢筋混凝土管,管道为DN350～500,厂外提升泵站2座,设计规模分别为1.5万m3/d、0.5万m3/d;污水处理厂工程分2期建设,其中近期规模为10 000m3/d,污水处理工艺采用预处理—两级生化处理—三级处理—     

邯郸市东污水处理厂再生水回用工程设计与运行

邯郸市东污水处理厂再生水回用工程总设计处理规模为5万m3/d,其中一期工程规模为3万m3/d.该工程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.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,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.     

保险粉冷凝液废水处理工程设计

保险粉冷凝液废水有机物浓度高,可生化性较差,属于难处理化工废水.设计采用IC厌氧+脱硫+AO+气浮+Fenton+好氧MBR工艺处理保险粉废水,可处理水量为150 m3/d.工程实际运行结果表明,出水中COD、NH3-N的平均浓度分别为151 mg/L和11 mg/L,平均去除率分别达到98.9％和88.8％.出水水质...     

七台河市城市缺水问题分析及对策

由于气候和产量变化异常,七台河市水资源严重短缺。主要为七台河市供水的桃山水库1990年建成后,一期工程兴利库容仅为0.98亿m3,设计95％保证率向七台河市供水2300万m3/a,平均供水量6.3万m3/d,而近几年七台河市日需水量约为17万m3/d,用水量为62000万m3/a,是水库现状供水能力的2.7倍。文章分析了缺水的原因与解决对策。     

长沙市第一水厂改造扩建工程设计

为了提高供水水质、解决安全生产隐患、发挥地理位置优势,实施了长沙市第一水厂的改造扩建工程。该工程设计总规模20万m3／d,分两期建设,工程包括新建取水口、自流管、提升泵站、净水处理构筑物和改造取水泵房,采用清水池与絮凝池、沉淀池、过滤池叠合建造形式。单位产水量占地0.08 m2／m3,清水池调节容积占设计规模9.49％,绿地率35.56％。运行证明,该工程达到并超过了原设计要求,建设过程保证正常生产,土地利用率高,为市政自来水行业老水厂在用地受到限制时进行改造扩建积累了经验。     

信息三则

福州市将建 2座污水处理厂目前福州市正在加快建设新的污水处理厂 ,计划今年建成金山污水处理厂 ,处理规模为 5万m3 /d ;今年至2 0 0 7年建成连坂污水处理厂 ,处理污水近期规模为 1 5万m3 /d ,远期规模为 4 5万m3 /d。福州市已投入 30多亿元加快城市污水处理设施建设 ,现拥有祥坂、马尾、快安、洋里 4座污水处理厂 ,日处理污水能力达 2 9万m3 ,城市生活污水处理率已接近 6 0 %。洋里污水处理厂是该市实施水环境治理的核心工程 ,远期规模为 70万m3 /d ,一期设计规模为 2 0万m3 /d ,目前实际处理规模近 1 7万m3 /d。 (水工 )东莞计划投资 2 3 …     

清源水质净化厂三期工程设计完成

该净化厂位于广东省汕头市澄海区,工程占地250亩,设计总处理规模为18万m3/d,分三期实施,计划2015年前全部建成。首期工程投资2·3亿元,包括集污管网、中途提升泵站和污水处理厂区三部分,其中集污管网和厂区布局等一并考虑规划中的二、三期工程进行建设。一期工程目前已竣工并投入运行。该工程为三期工程,建设规模为处理污水6万m3/d,项目总投资4500万元。清源水质净化厂三期工程设计完成     

Call for Papers

正As the eldest and most distributed professional journal of water industry,Water Wastewater Engineering(W WE)gained very wide acceptance from the colleagues working in this field in this country since start publication in 1964.Now it is administrated by the Ministry of Construction of the People’s Republic of China and sponsored by the China Civil Engineering Society etc.     

Serial discontinuities in a Rocky mountain river. I. Distribution and abundance of plecoptera

Samples were taken year-round at eleven sites along the altitudinal profile (2900-1400 m a.s.l.) of the Gunnison River, a 329 km tributary of the Colorado River, to document the distribution of the Plecoptera and to evaluate responses to hypolimnial-release dams in the headwaters and middle reaches. Twenty-two species were present, with the greatest species richness occurring in an unregulated segment upstream of the middle reach dams; average nymphal biomass over the study period (175 organisms, 395 mg dry mass m^?2) was also greatest in this segment. Only four species (58 organisms, 48 mg m^?2) were present in the tailwaters of the headwater dam and values were greatly reduced (nine species; 35 organisms, 180 mg m^?2) below the middle reach dams. The stonefly community recovered ca. 80 km downstream from the last dam (15 species; 244 organisms, 250 mg m^?2), apparently in response to natural resetting of environmental conditions corresponding to those above the middle reach dams. At the most downstream site (11) only four species (four organisms, 16 mg m^?2) were present. The observed distributional pattern is a classic serial discontinuity in response to hypolimnial stream regulation in a temperate latitude river.     

地下厂房施工过程的三维非线性数值模拟分析

根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。     

Impacts of Microcystis on algal biodiversity and use of new technology to remove Microcystis and dissolved nutrients

Cyanobacteria often dominate eutrophic lakes, outcompeting green algae that are required by fish and zooplankton. This study was undertaken to ascertain the impact of the cyanobacterium, Microcystis, on algal biodiversity. Under laboratory conditions, we found that the presence of Microcystis decreased phyla richness by 58%, phyla evenness by 47%, genera richness by 66% and genera evenness by 51%. Analysis by mixed anova s demonstrated a significant interaction between treatment and time and confirmed a significant reduction in richness and evenness of phyla and genera. We also conducted a phosphate restriction assay on the algae in Mason Lake (Irvine, CA, USA) and found that the threshold needed for algal growth there was 0.02 mg L^?1 PO₄. A pilot study was then conducted to test the effectiveness of the Blue Pro? water treatment facility in removal of this colonial organism from Mason Lake, in addition to removal of dissolved nutrients required for its growth. We measured a 97% reduction in Microcystis cells, a 72% reduction in chlorophyll‐a, and a 96% reduction in phosphate after just one 10 min cycle through the unit. Our study demonstrated that removal of Microcystis colonies may allow green algae to increase in numbers. This may improve algal biodiversity, which will benefit zooplankton and fishes.     

Evaluation of freshwater mussel relocation as a conservation and management strategy

The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects.     

库水波动下库岸边坡地下水浸润线解析解及误差分析

解析法是库岸边坡地下水浸润线计算中便于实际应用的方法,但该方法须基于若干假定并对潜水运动基本方程线性化后才能求解。针对各假定和线性化过程建立不同的地下水渗流数学模型,用解析法和有限元法解答上述数学模型,分析各误差大小及其规律。结果表明：库岸垂直处理带来的误差要小于方程线性化处理和不考虑非饱和渗流带来的误差,而且它们都随渗透系数变大而减小;在三峡库区库水调度情况下,假定库水位等速变化带来的误差对大多岸坡而言可以忽略;计算库岸边坡地下水浸润线时,解析法只适用于水位变化幅度相比含水层厚度较小,且几何边界规则、岩土结构简单、岩土体渗透性较好时的情况。     

Changes in Summer Irrigated Crop Area and Water Use in Southeastern Turkey from 1993 to 2002: Implications for Current and Future Water Resources

Changes in summer irrigated cropland acreage and related water use are estimated from satellite remote sensing and ancillary data in semi-arid Southeastern Turkey where traditionally dry agricultural lands are being rapidly transformed into irrigated fields with the help of water from the Euphrates-Tigris Rivers. An image classification methodology based on thresholding of Landsat NDVI images from the peak summer period reveals that the total area of summer irrigated crops has increased three-fold (from 35,000 ha to over 100,000) in the Harran Plain between 1993 and 2002. Coupled analysis of annual irrigated crop area from remote sensing and potential evapotranspiration based estimates of irrigation water requirements for cotton indicate a corresponding increase in agricultural water use from about 370 million cubic meters to over one billion cubic meters, a volume in accordance with the state estimates. These estimates have important implications for understanding the rapid changes in current agricultural withdrawals in Southeastern Turkey and form a quantitative basis for exploring the changes in future water demands in the region. For example, expansion of irrigated lands have led to a steady decrease in potential evaporation due to increased roughness and decreased humidity deficit in the Harran Plain. Assuming that the changes in future evaporation conditions will be of similar nature, water use for irrigation is expected to decrease over 40 percent in future irrigation sites. Incorporating this decrease in overall planning of the irrigation projects currently under construction should lead to improved management, and by extension, sustainability of water resources in the region.     

簸箕李引黄灌区水沙分布及优化调度的经验

灌区利用水沙观测所取得的资料和试验数据，运用水沙运动力学理论，总结分析和揭示了灌区水沙分布的规律和特点。在此基础上，结合灌区的实际运行情况，围绕减少骨干渠道的淤积进行探讨、研究，进而，优化水沙调度方案。该方案实施后，骨干渠道减旅伴效果明显，取得了成功的经验。     

小湾水库大坝防渗面板及其裂缝的加固处理

小湾水库大坝防渗面板整体抗渗性能差,且存在多条裂缝,通过对面板钢丝网喷涂丙乳砂浆加固处理及其裂缝修补,大坝渗漏量明显减少,且左岸上灌浆廊道内及大坝下游坝面92～93 m高程下廊道入口处原有小股射流全部消失.     

基于模型试验的河床砂砾石层基本特性研究

为了经济可靠地确定深厚覆盖层的基本特性参数,以大渡河双江口水电站坝基河床砂砾石层基本特性研究为工程背景,进行大尺寸模型试验,研究河床砂砾石层的旁压模量和动探击数随密度、级配以及上覆压力的变化规律。根据室内模型试验结果,结合现场旁压试验及钻孔试验成果,推断出坝址区河床砂砾石相关层位的密度,并依此进行砂砾石室内力学试验,获得设计所需力学参数。研究成果可为深厚覆盖层基本特性测试提供新的方法。