低温等离子体去除船舶尾气脱硫洗涤水中多环芳烃的影响因素
Factors affecting degradation of polycyclic aromatic hydrocarbons from ship’s emission desulfurization wash waterbased on non-thermal plasma
投稿时间:2018-10-19  修订日期:2018-12-28
DOI:10.13788/j.cnki.cbgc.2018.12.005
中文关键词:  脱硫洗涤水  多环芳烃  低温等离子体  船舶尾气
英文关键词:desulfurization  wash water, polycyclic  aromatic hydrocarbons (PAHs), non-thermal  plasma, ship’s  emission
基金项目:工业和信息化部高技术船舶科研计划(工信部联装函[2016]548号;工信部联装函[2017]21号)
作者单位E-mail
张拿慧 上海海洋大学 海洋生态与环境学院 nhzhang@shou.edu.cn 
朱荧 上海海洋大学 海洋生态与环境学院  
盛伟群 上海船舶设备研究所  
凌云 上海海洋大学 海洋生态与环境学院  
彭自然 上海海洋大学 海洋生态与环境学院  
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中文摘要:
      船舶尾气排放硫氧化物和氮氧化物是大气污染主要来源之一,采用湿法脱硫技术是减少硫氧化物排放的有效途径。但湿法脱硫后产生的洗涤水含有多种有害物质,其中多环芳烃为主要污染物之一,国际海事组织规定其含量不得超过2250 μg/L。本研究以萘为多环芳烃代表物,采用低温等离子体技术处理船舶尾气脱硫洗涤水,分别考察低温等离子体工艺参数(放电功率、进气量)和处理过程特征参数(温度、pH、水中阴离子)对萘去除率的影响。结果表明,最佳氧气进气量和放电功率分别为3 L/min和132 W,该条件下萘去除率随温度升高先增大后降低;pH升高有利于萘的降解;水中SO42-、SO32-、NO3-、NO2-、HCO3-对萘的降解有不同程度的影响,其中HCO3-的影响最为显著。
英文摘要:
      SOXand NOX of ship’s emission are the main air pollutants. Wet desulfurization technology is an effective approach to reduce SOX emission. However, desulfurization wash water produced from desulfurization process contains many harmful materials, in which polycyclic aromatic hydrocarbons (PAHs) are one of the major pollutants with higher teratogenicity, carcinogenicity and mutagenicity. International maritime organization requires that the concentrations of PAHs in washing water should not more than 2250 μg/L. In this paper, degradation of naphthalene as a key PAHs using non-thermal plasma technology was investigated along with changes in discharge power, O2 flow rate, temperature, pH and different anions (i.e., Cl-, SO42-, NO3-, HCO3-). The results indicated that the optimal O2 flow rate and discharge power were 3 L/min and 132 W, respectively. Degradation rate of naphthalene followed an increasing then decreasing pattern with increased temperature. Increase in pH enhanced naphthalene degradation. Different anions caused a different shift in naphthalene degradation, while HCO3- had significant effect on naphthalene degradation.
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