采用强电离放电法降解废水中难降解有机物

发布时间：2018-04-03 15:17

本文选题：低温氧等离子体　切入点：深度降解　出处：《高电压技术》2017年08期

【摘要】：为降解废水中难降解有机污染物,采用强电离放电将氧离解、电离成低温氧等离子体,并将其注入废水处理反应塔中,在反应塔中主要进行四步关键的等离子体反应。首先,低温氧等离子体中O_2~+与水分子反应生成微量·OH;然后,O_3与微量·OH反应形成高反应速率常数的过氧羟基自由基引发剂HO_2·;接着,高浓度O_3在引发剂HO_2·作用下生成氧化力强、反应速率很高的足量高浓度·OH;因此·OH将无选择、快速地将废水中难降解有机污染物降解成无害小分子有机物,最终矿化成CO_2、H_2O。实验结果表明:低温氧等离子体仅用2.5 min把废水中难降解有机污染物质量浓度从145.0 mg/L降至25.5 mg/L,去除率达到83.5%。与常规污水处理技术相比,采用强电离放电形成低温氧等离子体降解废水中难降解有机物方法具有设备投资和运行成本低以及污水处理系统简单等特点,将为受难降解有机物污染的废水回用提供一种经济、实用的新方法。
[Abstract]:In order to degrade the refractory organic pollutants in wastewater, oxygen is dissociated by strong ionization discharge and ionized into low temperature oxygen plasma, which is injected into the wastewater treatment reaction tower. Four key steps of plasma reaction are carried out in the reactor.First, O _ s _ 2~ in low temperature oxygen plasma reacts with water molecules to produce trace amounts of OH; then, O _ S _ 3 reacts with trace OH to form superoxide hydroxyl radical initiator HO_2 with high reaction rate constant; then, high concentration O _ 3 produces strong oxidation power under the action of initiator HO_2.Therefore, OH will not have the choice to quickly degrade the organic pollutants in the wastewater into harmless small molecular organic compounds, and finally mineralize to CO _ 2O _ 2H _ 2O.The experimental results show that the mass concentration of refractory organic pollutants in wastewater can be reduced from 145.0 mg/L to 25.5 mg / L by low temperature oxygen plasma for only 2.5 min, and the removal rate is 83.5%.Compared with the conventional wastewater treatment technology, the refractory organic matter in wastewater is degraded by high ionization discharge to form low temperature oxygen plasma, which has the advantages of low equipment investment, low operation cost and simple sewage treatment system.It will provide a new economic and practical method for reuse of wastewater contaminated by refractory organic matter.
【作者单位】：大连海事大学物理系;
【基金】：国家自然科学基金(61371027;11374044) 国家高技术研究发展计划(863计划)(2008AA06Z317)~~
【分类号】：X703

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