共查询到20条相似文献,搜索用时 187 毫秒
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内分泌干扰物(EDCs)是指干扰生物体内维持自稳及调节发育过程中激素的产生、释放、代谢、结合、排泄、交互作用的外源性物质.内分泌干扰物问题引起了公众的广泛关注.为了掌握北京市水源水和自来水中内分泌干扰物质的状况,对北京市主要供水水源的内分泌干扰物进行了调查,研究了水处理工艺对于内分泌干扰物的去除特点,指出壬基酚(NP)及其前体物(NPEOs)是北京地区饮用水中内分泌干扰物,地表水厂常规工艺(混凝-沉淀-过滤)对聚合度n为4~15的低浓度NPEOs(<1μg/L)基本上没有去除作用,后续活性炭工艺及加氯能降低NPEOs.对于NP(浓度>10μg/L)常规工艺与深度处理(活性炭或臭氧-活性炭工艺)相结合即可将NP浓度降低到环境推荐安全值(1μg/L)以下. 相似文献
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水处理活性炭的选择指标问题 总被引:30,自引:2,他引:28
研究发现,活性炭的比表面积、碘值,亚甲基蓝吸附值等吸附性能指标与活性炭对天然水中有机物的吸附能力之间相关性能不好,在选择去除天然水中有机物的活性炭时不能这些指标。提出了采用活性炭对水中四种典型有机物的吸附容量和吸附速度作为正确选择水处理用活性炭的指标,且在五种水质中得以验证。 相似文献
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表面化学改性活性炭在水处理中的应用 总被引:1,自引:0,他引:1
介绍了表面化学改性活性炭研究进展,就表面化学改性活性炭的特点和改性方法作了系统描述。在此基础上,对表面化学改性活性炭去除水中有机物、重金属离子、亚硝酸盐等污染物质做了简要说明。 相似文献
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考察了投加粉末活性炭吸附去除水中邻苯二甲酸二乙酯的可行性,并采用Freundlich公式拟合纯水和原水条件下的等温吸附方程。试验结果表明,采用粉末活性炭可有效去除水中邻苯二甲酸二乙酯,活性炭投加量为30mg/L,吸附120min后,纯水和原水条件下邻苯二甲酸二乙酯去除率分别为93.3%和89.3%。根据吸附等温方程计算得出,以邻苯二甲酸二乙酯的标准限值(0.3mg/L)为平衡浓度,纯水、原水条件下最大投炭量(80mg/L)可应对的邻苯二甲酸二乙酯最高质量浓度分别为7.575和5.731mg/L。 相似文献
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Adsorption of trihalomethanes from water with carbon nanotubes 总被引:15,自引:0,他引:15
Commercial carbon nanotubes (CNTs) were purified by acid solution and were employed as adsorbents to study adsorption of trihalomethanes (THMs) from water. The properties of CNTs such as purity, structure and nature of the surface were greatly improved after acid treatment which made CNTs become more hydrophilic and suitable for adsorption of low molecular weight and relatively polar THM molecules. The adsorption of THMs onto CNTs fluctuates very little in the pH range 3-7, but decreases with pH value as pH exceeds 7. A comparative study between CNTs and powdered activated carbon (PAC) for adsorption of THMs from water was also conducted. The short time needed to reach equilibrium as well as the high adsorption capacity of CHCl3, which accounts for a significant portion of THMs in the chlorinated drinking water, suggests that CNTs possess highly potential applications for THMs removal from water. 相似文献
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C.A. Wedeking Research Assistant V.L. Snoeyink Professor R.A. Larson Professor J. Ding Research Assistant 《Water research》1987,21(8)
Surface oxygen has an important effect on the wet air regeneration (WAR) of powdered activated carbons (PAC) and on the adsorption properties of the regenerated PAC. Virgin and phenanthrene-loaded PACs were regenerated in a bench-scale reactor, and then analyzed to determine surface oxygen content, adsorption capacity, and extent of phenanthrene oxidation.Even though the virgin wood-base (WB) and lignite-base (LB) PACs had about the same oxygen content, the oxygen content of the WB PAC increased more than twice as much as the LB PAC during regeneration. The difference was caused by the larger amount of CO2-evolving oxides that formed on the WB PAC. WAR reduces the capacity of PAC for p-nitrophenol (PNP). Removing the surface oxides had varying effects on the carbon's capacity for PNP. Also, adsorbed phenanthrene was more easily oxidized on the WB PAC than on the LB PAC during regeneration. 相似文献
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混凝-粉末活性炭工艺处理京杭运河微污染原水研究 总被引:1,自引:0,他引:1
针对京杭运河常州段原水水质情况,通过静态烧杯试验研究了混凝-粉末活性炭工艺对水中浊度、有机物等主要污染物的去除效果.试验结果表明,混凝可以有效去除浊度,去除率达97.3%;活性炭对有机物去除效果明显,其最佳投加量为30 mg/L.混凝剂对比试验表明,聚合氯化铝(PAC)和聚合硫酸铁(PFS)对臭和味、色度具有相同的去除效果;PFS对UV254、挥发酚的去除效果优于PAC,而对浊度、CODMn的去除效果较PAC差. 相似文献
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The authors have determined the adsorption energies of water and organic materials on saturated and unsaturated activated carbons. The original technique used is the differential scanning calorimetry method (DSC). Water is always found to be present in the inner structure of the activated carbons. This water has a low energy of interaction. The desorption enthalpies have been determined for carbon loaded with organic compounds. An energy distribution is shown for some molecules and then approaches of the adsorption mechanisms are confirmed. The energy values are compared with the literature data determined by other analytical methods. The energies of solid solute interactions have been related to physical and chemical parameters of the solute. A good correlation is found for families of molecules. 相似文献
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粉末活性炭在水体中强制分散及其作用研究 总被引:1,自引:1,他引:1
探讨了水处理中粉末活性炭投加的基本方法,针对粉末活性炭颗粒间相互吸附自凝聚现象,提出强制分散技术应用于粉末活性炭投加工艺,从而提高了粉末活性炭吸附技术处理受污染原水的效率。 相似文献
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粉末活性炭强化处理京杭运河常州段微污染原水 总被引:1,自引:0,他引:1
以京杭运河常州段微污染原水为研究对象,对其进行常规处理的同时增投粉末活性炭(PAC),通过静态吸附试验考察了最佳的投炭点和投加量.结果表明,投炭点在净水工艺流程中越靠前,则PAC对污染物的吸附效果越好;增投粉末活性炭可大幅度提高对有机污染物的去除效果;粉末活性炭的最佳投加点为吸水井,最佳投量为30 mg/L. 相似文献