摘要
以H2O2为氧化剂用间歇式超临界水氧化装置对聚乙烯醇(PVA)废水进行降解研究。通过正交实验,考察了反应温度、压力、时间及氧化剂过氧倍数对降解效果的影响,并且采用GC/MS对液相降解产物进行表征推测其可能降解途径。结果表明:PVA在SCWO体系中能完全降解,反应温度440℃、压力28 MPa、氧化剂过氧倍数4、反应40 min时,COD去除率为99.03%,出水COD=89.09 mg/L。PVA在SCWO体系中降解为烯烃、烯酮、醇和羧酸类中间产物、最终降解为小分子的饱和直链烷烃类液相产物。
The degradation of polyvinyl alcohol（PVA） using H202 as the oxidant in a batch tube reactor was studied. The influences of temperature, pressure, time and excess oxygen on the COD removal rate were investi- gated and the process conditions were optimized through orthogonal tests. The chief liquid products were charac- terized by GC/MS. The results showed that PVA could be degraded completely in supercritical water. When the reaction temperature was 440~C , the pressure was 28 MPa, oxygen excess was 4, and the reaction time was 40 min, the COD removal rate could achieve 99.03% and COD of the effluent was 89.09 mg/L. The liquid prod- ucts were alkene, enol, mellow, organic acids, straight chain alkane, and so on.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第8期2656-2660,共5页
Chinese Journal of Environmental Engineering
基金
广东省科技计划项目(2009B03802051)
关键词
超临界水氧化
聚乙烯醇
降解
表征
H2O2
supercritical water oxidation
polyvinyl alcohol（PVA）
degradation
characterization
H2 02
