摘要
利用自主设计的筛板塔装置模拟吹脱四氯乙烯(PCE)污染废水,综合考察了影响吹脱的各因素(气液体积比、初始浓度和筛板数等),同时对吹脱工艺条件进行了优化,并建立了吹脱模型.研究表明:25.68mg/L PCE废水经吹脱后出水浓度降至0.62mg/L,去除率可达97.59%;气液比对废水的吹脱效果影响很大,且最佳气液比在200左右;PCE初始浓度对去除率的影响并不明显;采用4层塔板时PCE去除效果较好;实验数据很好地遵从一级衰变模型;吨水吹脱成本约为0.31元,可作为后续生化处理的预处理工艺.
Perchloroethylene（PCE） as a typical chlorinated hydrocarbon solvent was widely used in industry.Now the groundwater of contaminated sites is badly polluted due to improper handling of PCE,which results in a serious threat to human health and ecological security.Air stripping in sieve plate tower for the treatment of the water polluted by PCE was studied.The results are as follows： After air stripping,PCE concentration declined from 25.68mg/L to 0.62mg/L,and removal rate amounted to 97.59%;Gas-liquid ratio obviously affected PCE removal rate and the optimum gas-liquid ratio was around 200;Initial concentration influenced the removal effect slightly;Waste water was better treated by 4 plates column;Experimental data followed one-order decay model very well;Economic cost was about $0.31 per ton of waste water,and therefore air stripping as a pre-treatment process of biochemical method was desirable.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2012年第6期1001-1006,共6页
China Environmental Science
基金
国家自然科学基金资助项目(40901148,40871223)
国家“973”项目(2011CB200904)
水专项(2012ZX07115)
林业公益性行业科研专项(201104088)
环保公益性行业科研专项(201109013)
中央高校基本科研业务费专项(WB0911011)
上海市博士后基金(11R21412500)
关键词
筛板塔
四氯乙烯
空气吹脱
地下水
sieve plate tower
perchloroethylene
air stripping
groundwater
