体相光催化处理有机废水新工艺

New photocatalytic reactor for treatment of organic wastewater

针对工业废水浓度和色度高、光线在废水中的穿透能力有限、催化剂极易中毒等因素,本文以球形微波无极灯为'点光源'填充反应器构建'体光源',提出体相光催化反应的设想,探索光催化处理工业废水的过程强化作用。分别以甲基橙溶液和含2,4-二氯酸农药废水为研究对象,探索体相光催化反应过程中有机污染物的降解性能;以乙醇水溶液和青霉素废酸水为研究对象,探索体相光催化反应过程热效应与光催化在废水处理中的耦合作用。结果表明,体相光催化反应不仅可以有效地降解水溶液中有机物,2,4-二氯酸农药废水CODCr去除率达到83.9%,而且利用反应器运行过程中的热效应能够100%地分离回收青霉素废酸水中的乙酸丁酯,同时去除55.8%的CODCr。因此,填充床式体相光催化反应系统能够将微波能、光催化和热效应集成于一体,在实现光催化技术处理有机废水及资源化的实际应用方面有积极意义。

In order to intensify photo-catalytic process for treatment of industrial wastewater,a new packed-source photo-catalytic reactor（PSPR）that is a glass reactor in which many small balls involving microwave electrodeless discharge lamp（MEDL）are packed,is put forward.Its performance was evaluated by photo-degradation of methyl orange and 2,4-dichlorophenoxyacetic acid in aqueous solution,and its coupling effect between heat produced by microwave and MEDL and photo-catalysis in degradating wastewater was studied by treating 10% ethanol solution and penicillin wastewater containing organic solvents（butyl alcohol and butyl acetate）.The experimental results indicated that not only more than 3 times degradation efficiency was performed compared with the conventional photo-reactor with UV lamp,and 83.9% CODCr could be removed in PSPR for the pesticide wastewaters containing 2,4-dichlorophenoxyacetic acid,but also the solvent could be recovered by the coupling effect,100% for butyl acetate.So,the new photocatalytic system can not only intensify photo-degradation of organic pollutants,but also separate and recover organic solvents from wastewater using heat from microwave and MEDL.The development of PSPR is an integration of microwave energy,photo-catalysis and heat effect,and is of the importance in industrial application for treatment of organic wastewater.