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微泡强化臭氧传质及其对产生羟基自由基的影响 被引量:9
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作者 程雯 全学军 +2 位作者 罗丹 李瑞恒 杨鲁 《化学反应工程与工艺》 CAS CSCD 北大核心 2017年第5期458-465,共8页
为提高臭氧在水中的传质效率,设计了微泡反应器强化臭氧传质,考察了在该反应器中不同压力、温度、臭氧进口浓度及流量对液相中臭氧浓度以及羟基自由基产生的影响。结果表明,液相中臭氧浓度受压力影响较小,反应器压力增加可使液相中羟基... 为提高臭氧在水中的传质效率,设计了微泡反应器强化臭氧传质,考察了在该反应器中不同压力、温度、臭氧进口浓度及流量对液相中臭氧浓度以及羟基自由基产生的影响。结果表明,液相中臭氧浓度受压力影响较小,反应器压力增加可使液相中羟基自由基产生量增大;进口臭氧浓度及流量的增加,可使液相中臭氧浓度以及羟基自由基产生量增大;液相温度升高导致液相中臭氧浓度降低,但可以提高液相中羟基自由基产生量。同时还将该微泡反应体系与传统鼓泡反应器进行对比研究,结果表明,微泡反应器能有效地提高传质效率,液相中臭氧浓度达到稳定状态时约为14 mg/L,比鼓泡反应器高约10%。微泡加压反应器中羟基自由基产生效果更好,臭氧通入5 min,微泡反应器中羟基自由基浓度高达121.45×10^(-6)mol/L,比鼓泡反应器提高了约11倍,且微泡反应器中废水脱色及矿化效率都高于传统鼓泡反应器。 展开更多
关键词 微泡反应器 臭氧羟基自由基 传质废水
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Effects of Coexisting Substances on Nitrobenzene Degradation with O_3/H_2O_2 Process in High-Gravity Fields
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作者 Zhang Shiguang Qin Yuejiao +3 位作者 Zhang Dongming Jiao Weizhou Guo Liang Liu Youzhi 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2016年第4期32-40,共9页
This study used nitrobenzene as the simulated pollutant to study the effects of common inorganic sodium salts and organics on nitrobenzene degradation by O_3/H_2O_2 in high-gravity fields. The experiment results showe... This study used nitrobenzene as the simulated pollutant to study the effects of common inorganic sodium salts and organics on nitrobenzene degradation by O_3/H_2O_2 in high-gravity fields. The experiment results showed that the highgravity technology could increase the nitrobenzene removal rate by improving the ozone transfer efficiency and ozone dissolution. Coexisting substances had different effects on the degradation kinetics of nitrobenzene in high-gravity fields. Among such substances, Na_2CO_3, NaOH, Na_3PO_4, and NaNO_3 accelerated the removal of nitrobenzene. The main action principle of nitrobenzene degradation by O_3/H_2O_2 is that the additives can increase the pH value of the solution, stimulate ozonolysis, generate hydroxyl radicals(·OH), and improve oxidation efficiency. By contrast, NaCl, NaHCO_3, NaHSO_4, ethanol(C_2H_5OH), acetic acid(CH_3COOH), formic acid(HCOOH), and tert-butyl alcohol(TBA) inhibited nitrobenzene removal. When NaHCO_3, CH_3COOH, or HCOOH were added, the pH value of the solution decreased and free radical chain reactions were hindered. However, NaCl, NaHCO_3, C_2H_5OH, and TBA consumed ·OH radicals and inhibited nitrobenzene removal. 展开更多
关键词 wastewater nitrobenzene coexisting substance high gravity ozone hydrogen peroxide
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