中空纤维膜技术及其应用   总被引：2，自引：0，他引：2  

吕经烈 《海洋技术学报》2002,21(4):73-76

阐述了膜分离技术的发展概况和意义，详细介绍了中空纤维超滤膜、微滤膜的技术特性，制备工艺，应用领域及发展前景。  相似文献   

饵料密度、温度和体质量对大西洋浪蛤滤水率的影响   总被引：6，自引：0，他引：6  

郭海燕  王昭萍  于瑞海  王芳  林志华 《海洋科学》2005,29(8):1-3

2004年4月～7月采用实验生态学方法对浙江引种养殖的大西洋浪蛤（Spisula solidissima）繁殖培育的一龄蛤进行滤水率的研究。结果表明：（1）以新月菱形藻为饵料，在适宜的饵料密度范围内大西洋浪蛤的滤水率随着饵料密度的增加而增大，它们之间呈函数关系；（2）体质量对滤水率的影响呈幂函数关系y=0．1622W^0.848（R^2=0．9988）；（3）在一定温度范围内，随温度升高滤水率增加；超过一定温度范围，随温度升高滤水率下降。当温度为21℃时滤水率达到最大值0．77L／h。  相似文献   

Use of ultrasonic treatment for extraction of humic acid with inorganic reagents from soil     

A.U. Ramunni  F. Palmieri 《Organic Geochemistry》1985,8(4):241-246

The use of ultrasonic vibrations (1 hr) on the extraction of humic acids (HA) from a brown soil has been compared with the extraction by mechanical stirring (24 hr) with two extractants: 0.5 N and 0.1 M Na₄P₂O₇, followed by extraction with 0.5 N NaOH. In the pyrophosphate extraction, ultrasonic and mechanical treatments produced the same yield of HA. Further extraction with NaOH and mechanical stirring gave higher yields.The elemental composition of HA changed remarkably with both ultrasonic and mechanical systems. The HA extracted with ultrasonic treatment showed a higher ash content and a lower content of COOH and phenolic OH groups. These HA's showed higher optical density at 260 and 450 nm when pyrophosphate-extracted, and lower optical density when NaOH-extracted. Moreover the ultrasonic-treated HA in both extractants showed a lower E₄₀₀/E₆₀₀ ratio.Infrared examination confirmed the difference in chemical characteristics of extracted HA. The HA distribution in the different classes of nominal molecular weights by Sephadex gel filtration was influenced by both ultrasonic and mechanical systems, specially for molecular weights between 5000 and 150,000. It has been noted that the differences due to both systems are less marked than those caused by ssing different extractants.  相似文献   

A method of physical approximation of the electromagnetic field     

Michael A. Frenkel  Alexander I. Katsevich 《Geophysical Journal International》1992,110(3):421-434

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城市垃圾卫生填埋场粘性土衬垫的截污容量及其研究意义   总被引：9，自引：0，他引：9  

刘长礼  王秀艳 《地质论评》2000,46(1):79-85

圾卫生填埋法的关键技术之一是防渗垫层的铺,国内外对防治在垫层的要求是“防渗”,所设计的防渗垫层所用材料种类多、价格贵、铺设复杂、成本高。若把垫层铺设的指导思想改为“截污”,可充分利用对垃圾具有净化或隔能力的场地粘笥土地和低垫层铺设民本。“截污容量”是基于这种思想提出出来的、用一博征粘性土的截污能力的物理参量,其科学和实用意义、试验测试及计算方法将在本文得到探讨。  相似文献   

武汉地区建筑废弃泥浆泥水分离试验研究          下载免费PDF全文

郑亮  刘晓烨  潘希军  郁红飞  李关雄  李煜坤  郭宇潮  穆庆岚 《探矿工程》2021,48(8):110-117

针对武汉地区不同地层、不同工艺产生的建筑工程废弃泥浆,通过光谱仪分析了其主要化学成分,并通过过滤、真空抽滤、离心以及不同絮凝剂的正交试验,以上清液浊度和清液率为主要指标对废弃泥浆泥水分离效果进行评价。试验发现：废弃泥浆固相颗粒以有机质为主;采用过滤方式取得的清液浊度较低,但清液率较少;采用真空抽滤方式处理废弃泥浆可以获得较多的上清液;采用离心方式能处理除含特细颗粒外的多数废弃泥浆;正交试验表明阳离子絮凝剂（PAM）处理废弃泥浆效果较好。  相似文献   

平面点集凸壳的一个性质   总被引：1，自引：0，他引：1  

樊广佺  曲文龙  杨炳儒 《地理与地理信息科学》2008,24(1):46-48

该文揭示了平面点集凸壳的一个性质,即如果一个子凸壳包含东、西、南、北4个方向上的极值点,则其任一条子凸壳边的外点必在该边所确定的外直角三角形中,并对该性质进行了数学证明。在此基础上,利用该性质对快速凸壳算法进行了改进,达到了良好的加速效果。  相似文献   

空心圆柱饱和多孔介质热固结问题的解析解     

白冰 《岩土力学》2011,32(10):2901-2906

基于考虑热渗效应和等温热流效应的热-水-力耦合的线性热弹性固结控制方程,建立无限长空心圆柱饱和多孔介质热固结问题的一种理论求解方法。该方法先给出Laplace变换域上的解,然后,利用Stehfest法求其数值逆变换。该理论解考虑了空心圆柱体内、外透水界面随时间变化的外力和温度荷载耦合作用过程。最后,通过一算例分析了饱和多孔介质的热固结特征,给出其温度、孔压、位移和应力的演化规律  相似文献   

Improving Sludge Dewaterability by Adding the Semi‐Dry Flue Gas Desulfurization Residue under Microwave Radiation          下载免费PDF全文

Hongji Liang  Lin Shi  Guoyou Yang 《洁净——土壤、空气、水》2014,42(9):1239-1247

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Detecting Virus‐Like Particles from the Umgeni River,South Africa          下载免费PDF全文

Atheesha Ganesh  Johnson Lin  Moganavelli Singh 《洁净——土壤、空气、水》2014,42(4):393-407

It is important to consider viruses in water quality because of their incidence as causal agents for diarrhoeal disease, and due to their characteristics, which allow them to survive in changing environmental conditions indefinitely. This study assessed the viral quality of the Umgeni River in South Africa seasonally. A two‐step tangential flow filtration process was setup to remove the bacteria and to concentrate the virus populations from large volume water samples. The concentrated water samples contained up to 659 and 550 pfu/mL of somatic and F‐RNA coliphages, respectively. Several virus families including Adenoviridae, Herpesviridae, Orthomyxoviridae, Picornaviridae, Poxviridae and Reoviridae were found in the river based on the morphologies examined under transmission electron microscopy. All concentrated water samples produced substantial cytopathic effects on the Vero, HEK 293, Hela and A549 cell lines. These results indicate the potential of viruses in the water samples especially from the lower catchment areas of the Umgeni River to infect human hosts throughout the year. The present study highlights the importance of routine environmental surveillance of human enteric viruses in water sources. This can contribute to a better understanding of the actual burden of disease on those who might be using the water directly without treatment.

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