微波液相放电氧化难生物降解有机废水

Treatment of Refractory-biodegradation Organic Wastewater by Microwave Discharge in Liquid

随着社会工业化进程的不断加快与发展,化工废水量也大幅增加,对环境的危害日益加剧。利用微波液相放电产生等离子体氧化处理难降解有机废水是一种有效的新技术。文章阐述了微波液相放电产生等离子体氧化技术的反应机理及技术优势,通过实验验证了该技术处理难生物降解有机废水的影响因素,并针对这项技术应用中需要深化探索的关键点给出建议。实验结果表明:输入功率1 000 W,水体流速250 mL/min, pH值6.0,H_(2)O_(2)加量为0.8%的条件下,微波液相放电氧化反应能在20 min内,对有机废水(COD原值5 000 mg/L)的COD去除率达98%;在最佳条件下反应10 min后,B/C值从0.12提高到0.31以上,废水性质由难生物降解转变为可生物降解,处理成本为41.00元/m;。

With the rapid development of the social industrialization process, the chemical waste water has been greatly increased, and its harm to the environment has become more and more serious. The use of microwave discharge in liquid to generate plasma treat refractory organic wastewater is an effective new technology. In this paper, the reaction mechanism and technical advantages of microwave discharge in liquid oxidation technology are described, and the influencing factors of microwave discharge in liquid oxidation of refractory organic wastewater are verified through experiments. The experimental results show that: under the conditions of 1 000 W input power, 250 mL/min water flow rate, pH 6.0 and 0.8% H_(2)O_(2)addition, the microwave discharge in liquid oxidation reaction can remove 98% of the organic pH armaceutical wastewater with an initial COD of 5 000 mg/L within 20 min;under the optimal reaction conditions, after 10 minutes of reaction, the B/C value increased from 0.12 to 0.31 of raw water, and the characteristic of wastewater changed from refractory to biodegradable, the treatment cost is 41.00 yuan/m;. Suggestions are also given for the key points that need to be further explored in the application prospect of this technology.