过氧化氢增强紫外-臭氧降解偏二甲肼

建立了氧化偏二甲肼(UDMH)废水的H_2O_2-UV-O_3氧化体系。以偏二甲肼和化学需氧量(COD)的去除率为检测指标,用正交实验确定了反应的主要影响因素和最佳工艺组合。比较了O_3、UV-O_3、UV-H_2O_2、H_2O_2-UV-O_3四种反应体系的降解情况。初步探讨了中间产物的变化规律。结果表明:在pH=9.0,鼓气处理24 h,臭氧投加速率19.6 mg·(L·min)-1,过氧化氢与偏二甲肼的物质的量之比为5∶1,紫外线类型VUV+UV-C,反应时间1.5h的条件下,偏二甲肼废水(质量分数1%)中偏二甲肼去除率和COD去除率可分别达到99.99%和99.30%。

Degradation of Unsymmetrial Dimethylhydrazine Waste Water by Hydrogen Peroxide Enhanced UV-Ozone Process

Oxidation system of H2O2-UV-O3 to oxidize the unsymmetrical dimethylhydrazine(UDMH) waste water was established.Using the removal efficiencies of UDMH and chemical oxygen demand(COD) as the detection indexes, the main factors affecting the reaction and the optimal technological conditions were determined through an orthogonal experiment.The degradation efficiencies of four systems: O3 system, UV-O3 system, UV-H2O2 system and H2O2-UV-O3 system were compared.The variation law of intermediate products was explored preliminarily.Results show that: the removal efficiencies of UDMH and COD in UDMH waste water(m·ss fraction, 1%) can reach up to 99.99% and 99.30% , respectively in the following conditions: air blows in hydrogen peroxide at pH 9.0 for 24 h, ozone addition rate is 19.6 mg·L-1·min-1, molar ratio of hydrogen peroxide to UDMH is 5∶1, the ultraviolet type is VUV+UV-C, the reaction time is 1.5 h.