等离子体产臭氧氧化肼类废水的应用研究

Oxidation of hydrazine wastewater by plasma-induced ozone technique

为提高肼类推进剂废水的处理效率,提出了采用氧气为气源的等离子体高压放电产生的活性气体氧化肼类推进剂废水的方案。依靠设计的试验装置,进行了静态和动态试验,获得了优化的运行参数。结果表明:在紫外线照射下,难降解中间产物甲醛的氧化速率提高,臭氧量与偏二甲肼的投加比达到5∶1时,可有效降解废水中的偏二甲肼及其中间产物,满足肼类废水排放标准;降解DT-3废水时,只需要3∶1的投加比即可使出水满足排放标准。结合卫星发射中心的实际情况,采用移动车载方式将该技术应用于推进剂废水处理,对于不同种类和不同浓度的推进剂废水具有较好的适应性,能获得较高的效费比。

High voltage discharge of plasma under oxygen enrichment can produce high concentration active gas.In order to improve the treatment ratio of hydrazine propellant wastewater,a plasma-induced ozone technique was introduced and its application in hydrazine oxidation was explored.Result shows the oxidation rate of refractory intermediate product(formaldehyde)increased under ultraviolet irradiation.Regulatory requirements of wastewater can be meet to unsymmetrical dimethyl hydrazine(UDMH)and DT-3 propellant wastewater in the mass rates of ozone/UDMH=5 and ozone/DT-3=3,respectively.Considering the actual situation of the satellite launch center,the plasma-induced ozone technique was applied in propellant wastewater treatment via moving vehicle mode.Practical operation in different types and concentrations of propellant wastewater indicated that the propellant wastewater treatment vehicle gains better flexibility and effectiveness-cost ratio.