好氧管式膜生物反应器处理高含盐有机废水的研究

采用好氧管式膜生物反应器处理不同含盐浓度的有机废水 ,研究结果表明 (1)进水COD浓度在 2 0 0 0～ 30 0 0mg/L时 ,出水COD在 179～ 2 2 3mg/L之间 ,COD平均去除率在 89.5 %以上 ;(2 )MBR处理高盐度有机废水耐冲击负荷的能力较强 ,出水水质稳定 ;(3)当膜的TMP =0 .1MPa,盐度为 1.0 %、1.5 %、2 .0 %时 ,管式膜的稳定运行通量分别为30、2 4、2 1L/ (m2 ·h) ,整个运行过程中没有进行膜清洗     

磷酸酯类偶联剂对CaCO3／HDPE体系偶联效果的研究

研究了自制磷酸酯“W-893”偶联剂对轻质CaCO_3/HDPE的偶联效果。就力学性能(抗张强度、弯曲强度、冲击强度),流变学特性(流动曲线、表现粘度、剪切敏感性、温度敏感性、挤出胀大、压力振荡、熔体破坏)和比重测定的结果发现:“W-893”/CaCO_3/HDPE体系的冲击强度可以为HDPE(5000S)的2～3倍(325目),甚至3～4倍(1250目);弯曲强度提高33.3％,抗张强度下降2.5％,比铝酸酯、钛酸酯的偶联效果好。     

阿尔夏提水库浇筑式沥青混凝土心墙施工技术与质量控制

【摘要】本文针对新疆阿尔夏提水库库区气候及材料特点,结合大坝沥青混凝土心墙施工配合比、拌和站布置、施工方法、施工工艺及质量控制等要求,探索总结出适用于小型工程沥青混凝土心墙施工及质量控制的方法。     

中国大坝设计洪水计算、评估与确定

回顾了新中国成立60年来中国大坝设计洪水计算的发展历程,总结了取得的经验和教训。在介绍现行规范规定的大坝设计洪水计算方法基础上,重点对中国大坝设计洪水的评估与确定进行了分析研究。     

马河水库大坝砂壳加固的试验xOt-究

结合马河水库除险加固的具体工程实践,通过对大坝砂壳振冲和翻压两种加固方法的试验资料的分析,证明了这两种加固方法的可靠性以及加固效果,为砂壳坝的加固提供可借鉴的实际资料。     

泽城西安水电站混凝土面板堆石坝铜止水连续施工工艺

面板是混凝土面板堆石坝安全稳定的重要部位,铜止水制作和安装是面板防渗关键环节。在泽城西安水电站大坝面板施工过程中,采用自行设计的铜止水加工模具,结构简单、操作方便,实现了铜止水的连续加工成型,最大限度地减少了铜止水的焊缝,节约了施工成本,加快了施工进度,并提高了铜止水的施工质量。     

浅埋偏压黄土隧洞进洞方案与施工技术

山西省大水网的建设中隧洞工程较多,超前小导管和钢拱架联合支护作为隧洞洞口及通过软弱破碎带之主要辅助工法,由于其施工速度快、安全性高、工期短,目前已广泛应用于隧洞工程。山西省中部引黄工程交汾灵支线2号隧洞出口为浅埋偏压黄土洞段,文中就此洞口的进洞方案与施工技术做了介绍,工程实践表明,其有效地减小了地表下沉和围岩变形,达到了确保不良地质段安全施工的目标。     

DISTRIBUTION AND ABUNDANCE OF STREAM FISHES IN RELATION TO BARRIERS: IMPLICATIONS FOR MONITORING STREAM RECOVERY AFTER BARRIER REMOVAL

Dams are ubiquitous in coastal regions and have altered stream habitats and the distribution and abundance of stream fishes in those habitats by disrupting hydrology, temperature regime and habitat connectivity. Dam removal is a common restoration tool, but often the response of the fish assemblage is not monitored rigorously. Sedgeunkedunk Stream, a small tributary to the Penobscot River (Maine, USA), has been the focus of a restoration effort that includes the removal of two low‐head dams. In this study, we quantified fish assemblage metrics along a longitudinal gradient in Sedgeunkedunk Stream and also in a nearby reference stream. By establishing pre‐removal baseline conditions and associated variability and the conditions and variability immediately following removal, we can characterize future changes in the system associated with dam removal. Over 2 years prior to dam removal, species richness and abundance in Sedgeunkedunk Stream were highest downstream of the lowest dam, lowest immediately upstream of that dam and intermediate farther upstream; patterns were similar in the reference stream. Although seasonal and annual variation in metrics within each site was substantial, the overall upstream‐to‐downstream pattern along the stream gradient was remarkably consistent prior to dam removal. Immediately after dam removal, we saw significant decreases in richness and abundance downstream of the former dam site and a corresponding increase in fish abundance upstream of the former dam site. No such changes occurred in reference sites. Our results show that by quantifying baseline conditions in a small stream before restoration, the effects of stream restoration efforts on fish assemblages can be monitored successfully. These data set the stage for the long‐term assessment of Sedgeunkedunk Stream and provide a simple methodology for assessment in other restoration projects. Copyright © 2011 John Wiley & Sons, Ltd.     

柘林大坝第二溢洪道泄洪运行安全分析

柘林大坝第二溢洪道泄洪闸结构稳定,位移和渗流运行性态正常,泄流能力满足原设计要求。但尾渠内人口稠密、房屋林立,一旦泄洪,如何保障尾渠内的人民生命财产安全是本工程泄洪运行需要重点关注的问题。因此,电厂必须与地方政府联动,制定出切实可行的防洪抢险应急预案,警钟长鸣、定期演练,以能在泄洪非常时期把损失降到最低。     

水布垭大坝总渗流量突变成因分析

介绍了水布垭水电站大坝加密监测及巡视检查的情况,从监测资料、巡视检查的角度,对坝体总渗流量2012年4月发生突变的情况进行了综合分析,分析成果为水布垭水电站安全稳定运行提供了依据。