共查询到19条相似文献,搜索用时 437 毫秒
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水处理活性炭的电化学再生技术研究 总被引:5,自引:0,他引:5
选择椰壳水处理活性炭作为吸附剂吸附处理低浓度苯酚废水,在室温条件下,在静止的电化学电极上对吸附苯酚后的活性炭进行电化学再生,探讨了各个操作参数对活性炭的电化学再生效率的影响。实验结果表明,电化学再生活性炭的效率较好,基本没有二次污染。再生效率随着电解质(氯化钠)溶液浓度的增加而增加,但达到1%以后基本没有变化。同时,再生效率随着再生电流的增加而提高,随着再生时间的增加,再生效率亦随之提高,但到5h以后,再生效率基本不随时间的变化而变化。 相似文献
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活性炭吸附技术在环境保护方面应用广泛,为提高活性炭的吸附性能和再生效果,将活性碳吸附技术与电化学相结合,最终实现电化学极化活性炭吸附与电化学再生一体化循环吸附工艺,从而降低活性炭吸附操作成本。文章总结了这二者结合的两方面研究前沿,其一电化学极化活性炭吸附技术;其二电化学再生活性炭技术,揭示出电极化吸附与电化学再生一体化循环的低成本活性炭吸附工艺的优势和发展方向。 相似文献
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传统电化学技术再生吸附饱和活性炭具有再生效率高、活性炭无质量损失的优点,但其存在着矿化效率低、生成毒理性副产物、能耗高等缺陷。电化学高级氧化(E-AOP)再生技术能有效克服传统电化学再生存在的问题。简述了传统电化学再生活性炭再生效能及机理,分析了操作参数(电流、电解质种类及浓度、再生位置、阳极材料等)对解吸-吸附平衡和污染物矿化效能的影响。总结了3类E-AOP再生技术(电Fenton再生技术、电活化臭氧再生技术、电活化过硫酸盐再生技术)在活性炭再生过程中的作用机制与应用。电Fenton再生技术再生效果较优,通过新型方式再生可有效克服体系内金属离子污染的问题;电活化臭氧活性炭再生技术无需添加任何化学品及催化剂,有利于控制反应条件及实现再生过程自动化;电活化过硫酸盐再生活性炭技术操作便捷、能耗较低,具有广泛的适用性。最后,提出了E-AOP再生技术存在的问题及发展前景,以期为开发一种新型高效环保的活性炭再生技术提供理论依据。 相似文献
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《Chemical engineering journal (Lausanne, Switzerland : 1996)》2002,85(1):81-85
The regeneration of coconut shell activated carbon contaminated with phenol was systematically investigated by electrochemical method under different operating conditions. The effects of several operating parameters on the electrochemical regeneration efficiency were measured at room temperature. The experimental results show that the electrochemical method can be used to regenerate the activated carbon exhausted with phenol. The electrochemical regeneration efficiency depends on several operating variables such as electrolyte concentration, regeneration current intensity and regeneration time. The residual phenol concentration in solution was much lower and the regeneration efficiency can reach 85.2% in a stirred electrochemical reactor after regeneration for 5 h. 相似文献
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苯酚在活性炭上的吸附与脱附研究 总被引:18,自引:0,他引:18
本文研究了苯酚水溶液在活性碳上的吸附平衡关系,溶液pH值对活性炭吸附性能的影响,苯酚在固定床上的吸附动力学和脱附动力学。同时采用间歇法和固定床连续法研究吸附苯酚后的活性炭碱再生工艺过程,多次再生对活性炭再生效率的影响,探讨了碱法再生活性炭的初步规律。 相似文献
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Huiping Zhang Liyi Ye Hui Zhong 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2002,77(11):1246-1250
The regeneration of phenol‐saturated activated carbon in an electrochemical reactor was investigated in order to develop a novel regeneration method of activated carbon. The regeneration of spent activated carbon saturated with phenol was conducted in a stirred electrochemical reactor under different operating conditions. The influences of operating parameters, such as regeneration current intensity and time, on regeneration efficiency were systematically investigated. The regeneration efficiency can reach over 80% under continuous stirring in the reactor, and it only decreases by less than 5% after four regeneration cycles. Electrochemical regeneration in the stirred electrochemical reactor is shown to be an effective method for the regeneration of phenol‐saturated activated carbon with a much higher regeneration efficiency compared with a process using NaOH solution. © 2002 Society of Chemical Industry 相似文献
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本文对被阳离子艳蓝染料溶液吸附饱和的活性炭进行了再生试验研究。根据复极性粒子群电极理论,提出了新的活性炭再生方法。此法再生效率高,能耗低,炭损和再生成衣低,操作简单,再生后的活性炭可反复使用。此法特别适用于吸附质是易吸附又易氧化还原的活性炭的再生。 相似文献
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饱和活性炭的高效绿色再生对活性炭在污染物吸附过程中的循环利用是非常重要的。本文利用超声波辅助熔融草酸的方法对饱和活性炭进行高效绿色再生,讨论了温度、时间、超声振幅和固液比对饱和活性炭再生效率的影响。结果表明,在超声辅助作用下,熔融草酸可在20min内使饱和活性炭得到快速再生,再生效率高达94.72%。通过5次吸附-脱附循环后,再生效率仍可达到78.02%,与此同时有机酸的回收率极高,平均达到98.35%,再生过程十分绿色环保。在超声的辅助作用下,强氢键缔合能力的熔融草酸更充分地与焦糖反应,形成草酸-焦糖强氢键缔合体系,降低焦糖与活性炭表面的亲和力,将焦糖解吸,实现活性炭的再生。该法可为绿色高效的活性炭再生方法的研究开发提供新思路。 相似文献
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《分离科学与技术》2012,47(1-2):111-127
Abstract Activated carbon loaded with toluene was regenerated by supercritical carbon dioxide. The adsorptive capacities after several regeneration cycles were still close to that of virgin carbon and remained stable. The effects of temperature, pressure, and flow rate on regeneration efficiency were studied. It was found that the operations at higher pressures were more favorable for regeneration, but the optimal operating temperature depended on pressure. The interphase mass transfer resistance was insignificant during regeneration. A one-parameter mathematic model assuming linear desorption kinetics is proposed which agrees well with the experimental data. The adsorption rates of activated carbon regenerated by the supercritical regeneration method and the steam regeneration method are compared in this study. It was found that the supercritical regeneration method is superior to the steam regeneration method. 相似文献
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分析了p H对颗粒活性炭(GAC)吸附苯酚性能的影响。实验选择质量分数为1%Na OH溶液,采用微波辅助溶液再生的方法,对吸附苯酚的GAC进行再生研究,探讨实验因素对GAC再生效率的影响。实验结果表明:最佳的再生条件为微波功率520 W、再生时间1.5 min、Na OH再生辅助溶液用量10 m L,此时GAC再生效率为95.6%。在最佳再生条件下,经过6次再生后GAC的吸附能力依然很强。 相似文献