河流渗滤系统对地表污水的净化作用综述   总被引：5，自引：1，他引：5  

李金荣  杨振放 《水文地质工程地质》2006,33(3):41-44

河流渗滤系统可充分利用水环境的净化功能,提高污水处理效率,避免地下水遭受污染.河流渗滤对地表污水的净化是一种自然过程,它作为天然的过滤器及生物地球化学反应器,可以除去河水中多种污染物,包括天然有机物、合成有机物、无机物、颗粒物、细菌及病原体等.文章分析了影响河流渗滤系统自净作用的影响因素,包括河流沉积物的组成、河流渗滤系统的结构、季节等.最后提出了今后研究河流渗滤系统的方向.  相似文献   

河流渗滤系统对硝态氮污水的净化作用研究     

李金荣  李金玲  杨振放 《水文地质工程地质》2007,34(1):24-28,43

河流渗滤系统对入渗的地表水有一定的净化作用,过去人们很少从理论上研究河流渗滤系统对污染河水的净化作用。本文采用室内土柱实验装置来模拟渭河渗滤系统,研究了硝态氮污染的河水在该系统中的环境行为及净化机制,其环境行为主要为反硝化作用。其净化程度与该渗滤系统的渗滤介质有关,如果渗滤介质为粘土,其净化率达到100%。若介质为粗砂粒物质,其净化程度较低。  相似文献   

纳米材料对低固相冲洗液性能影响的研究          下载免费PDF全文

刘徐三 《探矿工程》2022,49(4):61-67

低固相冲洗液是最适合绳索取心钻探工艺的冲洗液类型之一,但其防塌护壁能力和钻孔净化能力弱,阻碍了绳索取心钻探工艺在复杂地层的应用。本文通过实验研究,分析了纳米四氧化三铁、纳米氮化硼、纳米二氧化钛、多壁碳纳米管和纳米二氧化硅对低固相冲洗液的流变性能和滤失性能的影响规律。结果表明：纳米四氧化三铁、多壁碳纳米管和纳米氮化硼对低固相冲洗液的性能影响最明显,且具有增粘提切的作用。在此基础之上,通过正交实验分析了上述3种纳米材料复合后对低固相冲洗液性能的影响规律,得到性能优良的复合纳米低固相冲洗液体系优化配方：3%钠基膨润土+0.5%CMC-HV+0.3%纳米四氧化三铁+0.9%纳米氮化硼+0.9%多壁碳纳米管。最后,分析了纳米材料改善低固相冲洗液性能的作用机理。  相似文献   

一种改进的LiDAR点云TIN迭代滤波算法     

徐国杰  胡文涛 《测绘信息与工程》2010,35(1):33-35

采用了设定最大内插距离和最大内插角度两个阌值,根据滤波次数动态调整了其值以达到最佳滤波效果,实现并改进了TIN迭代滤波算法。  相似文献   

Nitrogen‐Doped Carbon Nanotubes/Polyethersulfone Blend Membranes for Removing Emerging Micropollutants     

《洁净——土壤、空气、水》2017,45(4)

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Bacteria Elimination and SO2 Filtration Using Spacer Fabric Loaded With Natural Zeolite‐Nanosilver Composites          下载免费PDF全文

Mohammad Mehdi Shirmohammadi‐Bahadoran  Majid Montazer  Mehdi Kamali Dolatabadi  Abbas Bahador 《洁净——土壤、空气、水》2018,46(9)

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Size fractionation of phosphorus (dissolved, colloidal and particulate) in two tributaries to Lake Lugano     

Sabine Hilger  Laura Sigg  Alberto Barbieri 《Aquatic Sciences - Research Across Boundaries》1999,61(4):337-353

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Combined Effect of Climatic Variations and Groundwater Movement on Observed Heat Flow     

Parkhomov  M.D.  Zui  V.I. 《Studia Geophysica et Geodaetica》1999,43(3):265-274

In most practical situations, the upper part of a geological section consists of loose sediments, in which heat transfer cannot be described as a purely conductive process. To investigate such situations a one-dimensional numerical model of terrestrial temperature field formation under the combined influence of vertical groundwater filtration and ground surface temperature changes has been developed. The model allows one to consider the perturbation of heat flow interval values resulting from short- and long-period temperature waves propagating into permeable rocks under conditions of advective heat transfer, caused by vertical groundwater filtration. The results show that temperature profiles and interval heat flow values are sensitive to both the paleoclimatic history and the rate of groundwater filtration. The latter plays the prevailing role in the variations of geothermal field parameters, especially within the uppermost part of the loose sediments in unconfined aquifers. The problem was solved for a permeable layer, underlaid by an impermeable layer. This schematisation of water exchange is the typically accepted for hydrogeological analysis. Even at very low rates of filtration the intensity of this effect is enhanced substantially for long-period variations. In the extreme case (for periods of temperature variations of the order of 100,000 years) at typical rates of filtration within the permeable layer, an almost gradient-free zone can be formed down to depths of a few hundred metres. For the case of upward filtration, on the contrary, the influence of climatic variations on the terrestrial temperature field becomes substantially attenuated.  相似文献   

中华鲟卵黄脂磷蛋白的分离纯化及性质分析     

庄平  丁建文  侯俊利  章龙珍  刘鉴毅  刘健  张涛  田美平 《海洋科学》2010,34(6):16-21

采用Sephacryl S-300凝胶过滤和DEAE Fast Flow阴离子交换两种层析法分离纯化中华鲟(Acipenser sinensis)卵黄脂磷蛋白(lipovitellin,Lv),对每个峰进行SDS-PAGE电泳及油红O、甲基绿和Schiff试剂特异染色,峰Ⅱ蛋白均呈阳性,表明峰Ⅱ蛋白为中华鲟卵中的一种卵黄脂磷蛋白,SDS-PAGE电泳分析表明其由一种分子质量为43.5 ku的亚基构成。对中华鲟Lv氨基酸组成进行研究,证明其是一种含有相对较多天冬氨酸、谷氨酸、缬氨酸和亮氨酸的蛋白。  相似文献   

The effect of salinity on clearance rate in the suspension-feeding estuarine gastropod Crepipatella dilatata under natural and controlled conditions   总被引：2，自引：1，他引：1  

O.R. Chaparro  Y.A. Montiel  C.J. Segura  V.M. Cubillos  R.J. Thompson  J.M. Navarro 《Estuarine, Coastal and Shelf Science》2008,76(4):861-868

The suspension-feeding gastropod Crepipatella dilatata occurs in estuaries in southern Chile that experience considerable fluctuations in salinity, driven by tidal and atmospheric forces. In the Quempillén estuary salinities as low as 9 psu may occur after severe rainstorms, and persist for several hours. In this study salinity was the major factor influencing the clearance rate of C. dilatata. At salinities below 20 psu, filtration ceased, whereas at high salinities (>22 psu) mean clearance rate was 0.24 l h⁻¹ standard animal⁻¹ (S.D. 0.18) for actively filtering individuals. This was confirmed by laboratory experiments under controlled conditions. Endoscopic observations were consistent with measurements of clearance rate, and showed that at salinity 25–30 psu the rate of transport along the gill filaments of particulate material embedded in mucus was 759 μm s⁻¹ (S.D. 480), but particle transport ceased at and below salinity 20 psu. Complete or partial isolation of the mantle cavity from the environment may be a mechanism to protect soft tissues and/or incubated egg capsules from osmotic stress.  相似文献