近临界水氧化处理模拟核废弃萃取溶剂及响应面优化  

Near-critical water oxidation treatment simulation nuclear waste extraction solvent and response surface optimization

作　　者：高亚华 柴涛[1] 谷溪 谷阳阳 

机构地区：[1]中北大学化工与环境学院,山西太原030051

出　　处：《应用化工》2018年第2期288-292,共5页Applied Chemical Industry

基　　金：山西省重点研发计划(201603D321019)

摘　　要：使用连续的超临界氧化设备,对模拟放射性废萃取剂在近临界水氧化条件下进行处理,采用响应面法对工艺参数进行优化,建立温度、压力、反应时间、过氧系数与COD去除率的二次回归模型,分析各因素显著性和交互作用。结果表明,温度和反应时间的交互作用对COD去除率影响最为显著,影响反应过程的因素由高到低为:反应温度、停留时间、反应压力和过氧系数。最佳工艺为温度506℃,压力21 MPa,停留时间158 s,过氧系数2.8。实验验证COD去除率达到99.75%~99.89%,与预测值99.91%无显著差异,此模型建立切实可行。模拟废液中加入硝酸锶以模拟放射性物质,在最优条件处理过程中,锶离子分离度达到99.92%,分离效果理想。The simulated radioactive waste extractant was treated with near-critical water oxidation using continuous supercritical oxidation equipment. The response surface optimization method was used to optimize the process parameters. The secondary regression model of temperature,pressure,reaction time,peroxide coefficient and COD removal rate was established,and the significance and interaction were analyzed.The results showed that the interaction between temperature and reaction time had the most significant effect on COD removal rate. The most significant factors affecting the reaction process were as follows: reaction temperature,residence time,reaction pressure and peroxide coefficient. Optimized after the best process:temperature 506 ℃,pressure 21 MPa,residence time 158 s,the oxygen coefficient of 2. 8. The experimental results showed that the removal rate of COD was 99. 75% ~ 99. 89%,which was not significantly different from the predicted value of 99. 91%. This model was feasible. The strontium nitrate was mixed with strontium nitrate to simulate the radioactive material. In the optimum condition,the separation rate of strontium ion and the treated solution reached 99. 92%,and the separation effect was satisfactory.

关 键 词：核废弃萃取剂处理 近临界水氧化 交互作用 化学需氧量 响应面优化法 

分 类 号：TQ9[化学工程] X591[环境科学与工程—环境工程]