超临界水氧化五氯硝基苯生产废水的研究  

Study on supercritical water oxidation of pentachloronitrobenzene sewage

作　　者：刘威[1] 柴涛[1] 赵军霞[1] 

机构地区：[1]中北大学化工与环境学院,太原030051

出　　处：《安全与环境学报》2010年第5期21-23,共3页Journal of Safety and Environment

摘　　要：在间歇式反应器中进行超临界水氧化五氯硝基苯生产废水试验。采用3因素3水平正交试验设计法,判断影响氧化处理效果的主次顺序为温度、压力、时间,并得到最佳工艺条件为反应温度500℃、反应压力28 MPa、停留时间30 s。进行单因素试验,考察了反应温度、压强两个主要因素对氧化效果的影响,温度升高和压强增大都有利于污染物去除。单因素试验结果表明,SCWO处理后出水水质达到国家规定的《污水综合排放标准》中的1级标准,验证了该最佳工艺条件的合理性。进行了均相催化和非均相催化超临界水氧化试验。结果表明,催化剂的加入可以显著提高COD的去除率。非均相催化剂中,采用TiO_2/ZnO双金属组合催化氧化的效率高于单一金属,均相催化剂Zn(NO_3)_2和Fe(NO_3)_3的催化效率相差无几,且都高于Cu(NO_3)_2催化效率,Na_2CO_3的催化效果最高。The present paper is inclined to report our experimental results performed in an intermittent reactor on the supereritieal water oxidation （SCWO） of pentachloronitrobenzene sewage. The above said orthogonal experiment was laid out to be conducted by means of three factors at three levels. As the result of our experiment, a conclusion was made that it is the key factors that affect the conversion are： the temperature, the pressure, as well as the retention time, respectively. From the experiments we have detected that the best reac- tion conditions are： the optimistic temperature： 500 ℃, the desirable pressure： 28 MPa, and the ideal retention time： 30 s. In addition, we have done some single-factor experiments to analyze the effects of the main factors on the oxidative degradation, the results of which indicate that the degradation could be promoted with the increase of the temperature and pressure. Besides, it was also proved that the efflu- ent water was conformed to the first grade of the national sewage dis- charge standard. Furthermore, the homogeneous catalysis and hetero- geneous catalytic supercritical water oxidation experiments prove that the use of catalysts can significantly help to increase the removal of COD. For example, in heterogeneous analysis, the TiO2/ZnO bimetallic particles help to increase the catalytic efficiency than each single component. Homogeneous catalysts Zn （ NO3 ） 2 and Fe （ NO3 ） 3 actually enjoy almost the same catalytic efficiency, both of them being higher than Cu（NO3）2. However, Na2CO3 had the highest efficiency.

关 键 词：环境工程学 超临界水氧化 正交试验 单因素试验 催化剂 

分 类 号：X703.1[环境科学与工程—环境工程]