摘要：

以偏二甲肼（UDMH）推进剂废水为例探究臭氧微纳气泡对肼类废水的处理工艺，在混合效果方面，通过比较臭氧微纳气泡方式和传统曝气方式，表明前者的混合效果显著提升，其中气含率由0.18%提升到1.45%，臭氧传质系数提升2.1倍，说明微纳气泡明显提升臭氧传质效率。利用单纯臭氧微纳气泡和臭氧大气泡对偏二甲肼废水进行处理，结果表明臭氧微纳气泡技术处理后的偏二甲肼降解率、COD去除率和氨氮去除率分别比臭氧大气泡提升17.7%、14.6%和31.0%。但由于臭氧氧化的局限性，单纯依靠臭氧无法实现偏二甲肼废水的高效处理，通过探究紫外、H₂O₂和臭氧催化剂的强化工艺，发现臭氧微纳气泡与紫外和贵金属臭氧催化剂的耦合工艺效果最佳，COD去除率由20.2%提升到79.0%，并且在能耗对比中，该耦合技术优势明显。

关键词: 臭氧, 微纳气泡, 偏二甲肼, 肼类废水

Abstract:

Taking unsymmetrical dimethylhydrazine(UDMH) wastewater as an example, the ozone micro-nano bubbles treatment process was explored. Compared with traditional aeration mode, it was found that micro-nano bubbles could significantly improve the mixing efficiency, in which gas holdup increased from 0.18% to 1.45%. Moreover, ozone mass transfer coefficient increased by 2.1 times, suggesting that micro-nano bubbles improved the mass transfer of ozone. In the treatment experiment of UDMH, the degradation rate, COD and ammonia nitrogen removal by ozone micro-nano bubbles increase 17.7%, 14.6% and 31.0% respectively in comparison with traditional aeration mode. However, ozone micro-nano bubbles can't realize the efficient treatment of UNMH due to the limitation of ozonation. Exploring the enhanced method of UV, H₂O₂ and ozone catalysts to micro-nano bubbles, it was found that the combination of UV and precious metal catalysts could significantly enhance the treatment efficiency of ozone micro-nano bubbles, such as the COD removal reached 79.0% in comparison with 20.2% by traditional aeration mode. In addition, the energy consumption showed that the coupling process of micro-nano bubbles exhibited obvious advantages.

Key words: ozone, micro-nano bubbles, unsymmetrical dimethylhydrazine, hydrazine wastewater

中图分类号: 

• X703