摘要
针对石化废水难降解的问题,采用活性炭作为臭氧氧化单元的催化剂,并串联生物活性炭(BAC)单元,从水质变化、有机物分子质量分布和有机物结构等角度解析催化臭氧氧化对石化废水中难降解有机物的降解特性,以及对后续BAC单元出水水质的影响机理。结果表明,活性炭催化对臭氧氧化去除COD和UV254均有一定的促进作用,且对后续BAC单元去除COD和UV254的促进效果更明显,其中,对UV254的去除效果影响更大,当臭氧投加量为15和20 mg/L时,催化臭氧氧化对UV254的去除率比臭氧氧化分别提升9.4%和11.5%,后续BAC单元对UV254的去除率比无催化条件时分别提升17.0%和15.4%;催化条件对进水有机物分子质量分布的改变在O3投加量为15 mg/L时更明显,相比臭氧氧化,催化臭氧氧化对进水中不可吹扫有机碳(NPOC)的去除率提升5.4%,出水中分子质量<1 ku的NPOC比例增加6%;进水经催化臭氧氧化后,有机物结构显著改变,酚类、链烷烃类及不饱和链酯类等难生物降解有机物的种类明显减少。
The ozonation (activated carbon as catalyst) tandem along with biological activated carbon (BAC) was applied to degrade refractory petrochemical wastewater.From the perspectives of water quality change,molecular weight distribution and structure of organic matter,the degradation of refractory organic matter in petrochemical wastewater by catalytic ozonation was investigated and its influence on the effluent quality of subsequent BAC unit was analyzed.The catalytic ozonation had a certain enhancement effect on the removal of COD and UV254,and the enhancement effect on the subsequent BAC unit was more obvious,espesdcially for UV254.When the ozone dosage was 15 mg/L and 20 mg/L,compared with the ozonation without catalyst,the removal rate of UV254by catalytic ozonation was increased by 9.4%and 11.5%,and the removal rate of UV254by subsequent BAC unit was increased by17.0%and 15.4%,respectively.The change of catalytic condition on molecular weight distribution of organic matter in influent was more obvious when the dosage of ozone was 15 mg/L.Compared with ozonation,the catalytic ozonation increased the removal rate of NPOC by 5.4%,and the proportion of NPOC with molecular weight less than 1 ku increased by 6%.After the influent was catalyzed by ozonation,the structure of organic matters was significantly changed,and the types of refractory organics such as phenolic,alkanes and unsaturated chain esters were significantly reduced.
作者
郑浩
许丹宁
代蓓蓓
孙井梅
ZHENG Hao;XU Dan-ning;DAI Bei-bei;SUN Jing-mei(School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China;Department of Water Affairs,Tianjin Petrochemical Company of Sinopec,Tianjin 300271,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2023年第1期73-79,共7页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2015ZX07203-011)。
关键词
催化臭氧氧化
生物活性炭
石化废水
难降解有机物
分子质量分布
有机物结构
catalytic ozonation
biological activated carbon
petrochemical wastewater
refractory organic matter
molecular weight distribution
structure of organic matter
