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为了增加土-膨润土泥浆墙回填材料对污染物的阻滞性能,本文采用活性炭对其进行改性。通过坍落度和土柱实验研究了添加活性炭对土-膨润土泥浆墙施工和易性、渗透性和兼容性能的影响,明确了活性炭添加量对泥浆墙渗透性和兼容性的作用规律。实验结果显示,满足泥浆墙墙体材料施工和易性要求的含水率范围随着活性炭质量分数增加而增大。活性炭质量分数为2%~10%的改性土-膨润土泥浆墙墙体材料渗透系数均小于1.0×10-7cm/s,满足垂直阻隔墙渗透系数要求。当活性炭质量分数≤2%时,活性炭的添加对墙体材料与苯酚溶液的兼容性能没有影响;随着活性炭质量分数的增大,苯酚对其不利影响加剧。当活性炭质量分数增大至10%时,活性炭改性土-膨润土泥浆墙不适用于苯酚污染地下环境。 相似文献
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矿物材料与环境污染治理—以粘土矿物和沸石为例 总被引:9,自引:0,他引:9
矿物的性能,矿区地质测试和吸附能力实验表明,粘土矿物和沸石等矿物材料对于Cr,Cd,Pb,Hg,As等有害元素具有很强的吸附能力,是理想的低成本吸附剂,在废水处理中可用来取代活性炭或离子交换树脂来去除重金属等有害元素。 相似文献
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活性炭从硫脲浸出液中回收金的工艺研究 总被引:6,自引:0,他引:6
本文研究了在酸性硫脲浸出液中活性炭回收金的工艺过程,实验表明,在该浸出液中活性炭对金具有较高的吸附速度、吸附率和吸附容量并易于解吸,为工业应用提供了可靠的技术依据。 相似文献
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为解决大面积多点快速土壤氡析出率测量问题, 设计开发并进行了土壤氡析出率活性炭累积吸附法的方法技术研究.在参考氡析出率装置和野外实验数据的基础上, 进行了测量装置及材料的选择、装置刻度、野外累积暴露时间、活性炭盒吸附氡有效衰变常数等研究.通过2002-2003年22次重复观测, 北京西北郊区粘土类土壤氡析出率平均值为20.15mBq.m-2.s-1, 最大值和最小值分别为26.75和13.49mBq.m-2.s-1, 标准偏差为3.55mBq.m-2.s-1.与仪器静电收集法比对结果表明, 两种方法的相对误差小于±10%.实验结果表明: 活性炭方法测量结果稳定可靠, 简便易行, 适用于全国大面积土壤氡析出率调查. 相似文献
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以黑龙江省大庆市林甸县长青林场3个不同小区为实验地,分别采用酸雨石等5种吸盐材料对不同小区盐碱土壤进行改良,根据改良后土壤pH、导电率变化,对不同材料的盐碱土壤改良效果进行比较。研究表明,短期内吸盐速率:酸雨石活性炭腐熟牛粪沸石稻壳,长期吸盐量:酸雨石活性炭沸石稻壳腐熟牛粪,效果持久性为酸雨石最强,活性炭、沸石次之,稻壳较弱,腐熟牛粪最弱。酸雨石解碱能力最强,活性炭次之,沸石、牛粪、稻壳解碱能力较弱。因此,酸雨石在5种盐碱土改良剂中具有最强吸盐解碱能力。 相似文献
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S. Y. Kim Y. H. Yoon K. S. Kim 《International Journal of Environmental Science and Technology》2016,13(9):2189-2198
An activated carbon-impregnated cellulose filter was fabricated, and the capacity to remove dust and volatile organic compounds was evaluated in a laboratory. The adsorption capacities for benzene, toluene, ethyl benzene and m-xylene gases were compared by an adsorption isotherm test conducted as a preliminary test, showing that m-xylene and benzene were the most and least favorable for adsorption onto activated carbon, respectively. Cellulose filters were made with four levels of activated carbon contents, and dust removal was performed with all of the filters showing 99 % and higher efficiencies stable with a small variation during the experiment. Activated carbon content of 5 g in the unit filter area (125 g/m2) was found optimum for benzene, toluene, ethylbenzene and m-xylene removal, as it appeared that higher than 5 g activated carbon content was unnecessary for the improvement of its capacity. With increasing benzene, toluene, ethylbenzene and m-xylene loading, the highest removal rates were determined as 0.33–0.37 mg/cm2 s for as short as 0.0046 s of air filter residence time. The rapid removal was possible because of the high surface area of the activated carbon-impregnated cellulose filter provided by powdered activated carbon, which is distinguished from the granular form in conventional activated carbon towers. As fixed within a cellulose scaffolding structure, the powdered activated carbon performed excellent benzene, toluene, ethylbenzene, and m-xylene adsorption (98.9–100 %), and at the same time, particular matters were removed in average 99.7 % efficiency after being filtered through the cellulose filter sheet. 相似文献
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S. Feng C. Chen Q. F. Wang X. J. Zhang Z. Y. Yang S. G. Xie 《International Journal of Environmental Science and Technology》2013,10(5):917-922
Modification of conventional rapid sand filter into granular activated carbon–sand dual media filter has become increasingly attractive to drinking water producers in many Chinese urban regions. In this study, a pilot-scale dual media filter was constructed to monitor its performance. The operational results indicated that the dual media filter performed well both on nitrification and on reduction of chemical oxygen demand. Microbial community structures at different sampling sites were also compared using 16S ribosomal ribonucleic acid gene clone library analysis to identify the spatial heterogeneity the filter. Clone library analysis illustrated the difference of microbial community structure and an increase of microbial diversity along the filter depth. Moreover, potential pathogens from genera Chromobacterium and Sphingomonas were detected in the filter samples, which deserved further serious consideration in downstream treatment such as disinfection. These findings also provided an illustration of the utility of molecular techniques to discover microbial community change and potential pathogens in the drinking water biofilters. 相似文献
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This paper presents the possible alternative removal options for the development of safe drinking water supplies in areas affected by hexavalent chromium. Chromate is a matter of great environmental concern due to its extensive contamination and carcinogenic toxicity. In this study, the conventional adsorption with various types of adsorbent method were used for chromate removal, but only powder carbon steel was compatible with household water treatment and can be designated based on high removal efficiency and affordable cost. Home powder carbon steel with granular activated carbon (PCS–GAC) treatment systems are quite simple. Water needing treatment passes through the cartridge or filter candles contacting PCS–GAC on its way to the faucet. This method is based on the use of powder carbon steel, ML 90 Bombril S.A, as a cleaning agent. Granular activated carbon filters have been employed in home water purification systems essentially for the removal of taste, odor, and color. The effect of pH, redox potential, time, and adsorbate concentration on the uptake carbon steel were observed. The lack of desorption suggests that anion chromium is irreversibly sorbed by the powder carbon steel. 相似文献
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非线性滤波方法与陆面数据同化 总被引:8,自引:4,他引:4
陆面数据同化研究近几年成为地球科学研究的新兴领域,其中以非线性滤波为代表的数据同化方法发展迅速并得到了广泛应用。在贝叶斯理论框架内,从递推贝叶斯估计理论的角度系统地分析了扩展卡尔曼滤波、无迹卡尔曼滤波、集合卡尔曼滤波、SIR粒子滤波等非线性滤波方法的异同;针对应用比较广泛的集合卡尔曼滤波和SIR粒子滤波应用中存在的问题,论述了几种提高滤波性能的实用方法,如协方差矩阵的Localization方法、协方差矩阵的Inflation方法、双集合卡尔曼滤波方法、扰动集合、扰动大气驱动和模型参数、平方根集合卡尔曼滤波以及粒子滤波算法的改进等。最后总结讨论了各种非线性滤波方法应用中的特点、难点以及各种算法在陆面数据同化中的应用前景和发展方向。 相似文献
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河西走廊蕴藏有丰富的地热水资源,以往的地质调查成果显示地热水的形成和演化与地质构造具有密切关系。活性炭测氡法在探测隐伏构造方面具有独特优势。活性炭对氡的吸附性能受到多种因素影响,在野外数据采集前需进行勘察区工作条件的测试实验。本文选择位于河西走廊中部的张掖—民乐盆地进行活性炭测氡法实验条件研究。通过实验,确定该区实验条件为:吸附剂埋深40 cm,埋藏5天;数据处理时针对农田和河滩两种地表介质要进行分区统计;该区氡异常阈值下限为均值加3 ~ 4倍方差。实验结果显示活性炭测氡法是探测该区域隐伏断裂的存在、断裂位置、走向和倾向的一种很好的手段。 相似文献