超临界水氧化处理棉纺织品印染废水  

Supercritical water oxidation of cotton textiles dyeing wastewater

作　　者：王齐[1,2] 吕永康[1] 张荣[3] 毕继诚[3] 

机构地区：[1]太原理工大学化学化工学院,太原030024 [2]太原科技大学化学与生物工程学院,太原030021 [3]中国科学院山西煤炭化学研究所煤转化国家重点实验室,太原030001

出　　处：《环境工程学报》2012年第11期3959-3964,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(20506028)

摘　　要：在温度400～600℃、压力25 MPa、停留时间10～45 s、过氧比0%～400%条件下,用超临界水氧化(SCWO)法在连续管式反应器中处理棉纺织品印染废水。分析了工艺条件对总有机碳(TOC)及氨氮(NH3-N)降解效率的影响。研究表明,温度是影响TOC降解的最重要因素,不同温度下,降解率随过氧比变化的趋势不同。在450℃、停留时间20 s、过氧比300%时,废水TOC降解达98.94%。NH3-N的降解与反应温度和氧化剂量密切相关。当过氧比300%,温度从400℃上升到600℃时,NH3-N的浓度从55.42 mg/L下降到3.31 mg/L,而600℃没有氧化剂存在时氨不易降解。450℃时随着过氧比增大NH3-N浓度略有下降,在该温度下停留时间延长对NH3-N降解无显著影响。Cotton textiles dyeing wastewater was treated by supercritical water oxidation（SCWO） in a continuous flow tubular reactor using hydrogen peroxide（H2O2） as an oxidant.The degradation of total organic carbon（TOC）and the ammonia and nitrogen（NH3-N）were studied at the temperature range of 400~600℃,25 MPa,residence time bewteen 10~45 s and excess oxygen varying from 0%~400%.The results showed that temperature is the most important factor influencing TOC degradation.The TOC degradation efficiency varies with excess oxygen at different temperatures.At 450℃,20 s and excess O2 300%,the degradation efficiency of TOC is 98.94%.The degradation of NH3-N is closely related to temperature and excess oxygen of the reaction.When excess oxygen of 300%,the NH3-N concentration decreases from 55.42 mg/L to 3.31 mg/L as the temperature increases from 400℃ to 600℃.When oxidizing agent is absent at 600℃,the degradation of NH3 is difficult.The effects of excess oxygen and residence time of the reaction on the NH3 degradation are not obvious at 450℃.

关 键 词：棉织品印染废水 SCWO TOC NH3-N 

分 类 号：X791[环境科学与工程—环境工程]