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Comparative studies of ozonation alone, ceramic honeycomb-catalyzed and Mn-Fe-K modified ceramic honeycomb catalyzed ozonation processes have been undertaken with benzophenone as the model organic pollutant. The experimental results showed that the presence of Mn-Fe-K modified ceramic honeycombs significantly increased the removal rate of benzophenone and TOC compared with that achieved by ozonation alone or ceramic honeycomb-catalyzed ozonation. The electron paramagnetic resonance (EPR) experiments verified that higher benzophenone removal rate was attribute to more hydroxyl radicals generated in the Mn-Fe-K modified ceramic honeycomb-catalyzed ozonation. Under the conditions of this experiment, the degradation rate of all the three ozonation processes are increasing with the amount of catalyst, temperature and value of pH increased in the solution. We also investigated the effects of different process of ozone addition, the optimum conditions for preparing catalyst and influence of the Mn-Fe-K modified ceramic honeycomb after multiple-repeated use. 相似文献
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以市售蜂窝活性炭为吸附材料,通过氮气吸附等温线和扫描电镜分析活性炭的比表面积、孔径分布和表面孔结构形貌,以评估活性炭吸/脱附苯系物的性能。利用动态吸附评价装置和气相色谱系统评价苯浓度、流速、不同苯系物流经蜂窝活性炭对其吸附容量的影响,并通过程序升温技术研究蜂窝活性炭脱附温度曲线。同时考察了水汽对蜂窝活性炭吸附容量、脱附温度曲线的影响。结果表明:蜂窝活性炭对苯系物的单位饱和吸附容量顺序为二甲苯>甲苯>苯,单位饱和吸附容量为66.5~138.1 mg/g,这可能是因为苯系物的分子尺寸效应影响了吸附容量。苯系物的最佳脱附温度基本维持在175 ℃。水汽的竞争吸附作用可以显著抑制苯的单位饱和吸附容量,引入1.8%的水汽后苯的饱和吸附容量降低了36.3%,这表明水汽占据了部分吸附位点,显著降低了苯的吸附容量。
相似文献65.
系统地考察了改性13X沸石分子筛(M-13X)蜂窝转轮对甲苯废气的吸附性能,探讨了运行参数和进气参数对转轮吸附的影响规律.结果表明,M-13X分子筛具有良好的抗湿性,转速、再生风温度过高或过低均会降低系统去除率,合适的浓缩比应兼顾效率与能耗.对于进气浓度100 mg·m-3,进气流速2 m·s-1的甲苯废气,推荐运行参数为再生风温度180℃,转速2.8~5 r·h-1,浓缩比8~12,在该运行参数下去除效率均维持在90%以上.该研究为M-13X蜂窝转轮工业应用提供设计经验及运行参数,对于高浓度废气,应控制较低的进气流速,同时加快转速、提高脱附热量以满足去除效果. 相似文献
66.
气升式内循环蜂窝陶瓷反应器降解2,4-二氯酚的研究 总被引:7,自引:1,他引:7
从以2,4-二氯酚(2,4-DCP)长期驯化的好氧活性污泥中分离出一株以2,4-DCP为唯一碳源的菌种,将这种菌固定在气升式内循环蜂窝陶瓷反应器内,研究了此反应器在半连续流运行时,对2,4-DCP单基质及其与苯酚共基质时对污染物的降解情况及降解动力学.结果表明,2,4-DCP单基质时,反应器对氯酚的去除效果随着实验次数的增加而加快;2,4-DCP与苯酚共基质时,苯酚的降解速率随着半连续流实验次数的增加而加快,而氯酚的降解速率则表现出下降的趋势.此外,还研究了此反应器在连续流运行时对2,4-DCP的降解,水 相似文献
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Lei Zhao Jun Ma Zhizhong Sun Zhengqian Liu Yixin Yang 《Frontiers of Environmental Science & Engineering in China》2008,2(1):44-50
The ozonation of nitrobenzene in aqueous solution was carried out in a semi-batch reactor to investigate the degradation efficiency,
the effect factors, and the reaction mechanism, where honeycomb ceramic was used as a catalyst. The presence of honeycomb
ceramic could improve the degradation rate of nitrobenzene by 15.46% compared to the results of ozonation alone. Under the
conditions of this experiment, the degradation rate of honeycomb ceramic-catalyzed ozonation increased by 12.94% with the
increase of the amount of catalyst from 1 to 5 blocks. The degradation rates all increased greatly with the increase of temperature
and pH of the solution in the processes of honeycomb ceramiccatalyzed ozonation and ozonation alone. But, when the pH of the
solution increased to 9.50, the advantage of the honeycomb ceramic-catalyzed ozonation process would be lost. The experimental
findings indicated that in the processes of ozonation alone and honeycomb ceramic-catalyzed ozonation, nitrobenzene was primarily
oxidized by ·OH free radical in aqueous solution. The adsorption of nitrobenzene was too limited to have an important influence
on the degradation rate of nitrobenzene. With the same total dosage of applied ozone, the multiple step addition of ozone
showed much higher removal efficiency than that obtained by one step in the two processes. 相似文献
69.
实验比较了单独臭氧氧化、蜂窝陶瓷催化臭氧化和蜂窝陶瓷催化剂吸附3种工艺去除水中草酸的降解效果.结果表明,蜂窝陶瓷催化臭氧化、单独臭氧氧化和蜂窝陶瓷催化剂吸附对水中草酸的去除率分别为37 .6%、2 .2%和0 .4%,蜂窝陶瓷催化剂的存在显著提高了臭氧氧化降解水中草酸的去除效果.添加叔丁醇的浓度为5、10和15 mg·L-1时,催化臭氧化对草酸的去除率分别降低了24 .1%、29 .0%和30 .1%,证明蜂窝陶瓷催化臭氧化降解水中草酸遵循·OH氧化机理,即非均相的催化剂表面强化了·OH的引发.TOC测试结果显示,蜂窝陶瓷催化臭氧化工艺可以将草酸彻底矿化,无中间产物生成.反应温度与草酸的去除效果成正相关性,当水体温度为10、20、30和40℃时,蜂窝陶瓷催化臭氧化降解水中草酸的去除率分别为16 .4%、37 .6%、61 .3%和68 .2%. 相似文献
70.