引用本文:王奕文,张倩,伍斌,马福俊,李发生,谷庆宝,等.脉冲电晕放电等离子体去除污染土壤热脱附尾气中的DDTs[J].环境科学研究,2017,30(6):974-980.
WANG Yiwen,ZHANG Qian,WU Bin,MA Fujun,LI Fasheng,GU Qingbao,et al.Removal of DDTs in Thermal Desorption Off-Gas by Pulsed Corona Discharge Plasma[J].Reserrch of Environmental Science,2017,30(6):974-980.]
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脉冲电晕放电等离子体去除污染土壤热脱附尾气中的DDTs
王奕文, 张 倩, 伍 斌, 马福俊, 李发生, 谷庆宝
中国环境科学研究院土壤污染与控制研究室, 北京 100012
摘要:
为探索新型产业化应用热脱附尾气处理技术,采用脉冲电晕放电等离子体技术对含DDTs的热脱附尾气进行处理,考察了工艺参数如脉冲电压、脉冲频率、ρ(DDTs)和停留时间对DDTs处理效果的影响,分析了DDTs经低温等离子体处理后的分解产物. 结果表明,DDTs的去除率随脉冲电压的升高、脉冲频率的增大和停留时间的延长而增加,随进气中ρ(DDTs)的升高而降低,但去除量随进气中ρ(DDTs)的升高而增大. 进气中的ρ(DDTs)为30.0 mg/m3,停留时间为10 s,脉冲电压为30.0 kV,脉冲频率为50 Hz时,DDTs的去除率为82.5%. 低温等离子体处理后,尾气中的ρ(p,p′-DDT)、ρ(o,p′-DDT)和ρ(p,p′-DDD)降低,ρ(p,p′-DDE)反而升高,另有微量的二苯甲烷、二苯甲醇、4,4′-二氯二苯甲烷、2,4′-二氯苯甲酮和1,1-双(对氯苯)-2-氯乙烯等分解产物被检出. 研究显示,脉冲放电等离子体技术具有去除效率高等特点,可有效去除含DDTs的热脱附尾气.
关键词:  热脱附尾气  DDTs  分解产物  脉冲电晕放电  低温等离子体
DOI:
分类号:
基金项目:中国环境科学研究院中央级公益性科研院所基本科研业务专项(2015-YSKY-01)
Removal of DDTs in Thermal Desorption Off-Gas by Pulsed Corona Discharge Plasma
WANG Yiwen, ZHANG Qian, WU Bin, MA Fujun, LI Fasheng, GU Qingbao
Department of Soil Pollution and Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Abstract:
Abstract: In order to explore a new industrial application of thermal desorption off-gas treatment technique, pulsed corona discharge plasma was applied to remove DDTs in thermal desorption off-gas. The effects of pulse peak voltage, pulse frequency, inlet concentrations and residence time on DDTs removal rate were investigated. The degradation products of DDTs after the treatment were also analyzed. The DDTs removal rate increased with the increase of the pulse peak voltage, the pulse frequency and the gas residence time. The DDTs removal rate decreased with the increase of ρ(DDTs), but the removal quantities of DDTs increased with the increase of ρ(DDTs) in the feed gas. DDTs removal efficiency was 82.5% when 30.0 mg/m3 of ρ(DDTs) in off-gas was treated for 10 s at pulse voltage of 30.0 kV and pulse frequency of 50 Hz. After treatment, ρ(p,p′-DDT), ρ(o,p′-DDT) and ρ(p,p′-DDD) in off-gas decreased, but ρ(p,p′-DDE) increased. In addition, DM, BH, DDM, DBP and DDMU with low contents were detected as the degradation products of DDTs. In conclusion, the pulsed discharge plasma is characterized as high removal efficiency, which can effectively remove thermal desorption off-gas containing DDTs.
Key words:  thermal desorption off-gas  DDTs  degradation products  pulsed corona discharge  no-thermal plasma