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满小媛,宁寻安,路星雯,梁洁莹,刘道华,赖晓君.超声/Fe⁰/EDTA体系对印染污泥中多环芳烃的降解[J].环境科学学报,2018,38(3):1049-1055

Degradation of polycyclic aromatic hydrocarbons from textile dyeing sludge by ultrasound/Fe⁰/EDTA system

基金项目：广州市科技计划（No.201607010330）；广东省科技计划（No.2015A020215032）；国家自然科学基金（No.21577027）

摘要：Fe⁰/EDTA类芬顿体系能产生氧化能力极强的羟基自由基（·OH），已被广泛应用于有机污染物的去除.提高·OH的生成速率和浓度是高效降解有机污染物的关键.因此，本文利用超声/Fe⁰/EDTA体系处理印染污泥，探讨了不同反应参数对体系中产生·OH的影响，考察了该体系对印染污泥中多环芳烃（PAHs）的去除效果.结果表明，在pH为3.0，超声功率为540 W，Fe⁰投加量为15 g·L^-1，EDTA浓度为2.0 mmol·L^-1的最佳条件下，·OH浓度高达862 μmol·L^-1.印染污泥中的铁絮凝剂可作为超声/Fe⁰/EDTA体系中Fe²⁺和Fe³⁺的来源，促使该体系循环产生H₂O₂和·OH.超声/Fe⁰/EDTA体系产生的·OH能快速有效地降解印染污泥中的PAHs，∑₁₆PAHs的平均去除率达到77%，同时有机质含量下降了10.1%.

Abstract：The Fe⁰/EDTA Fenton like system could produce hydroxyl radicals (·OH) which possesses strong oxidizing capacity, and was widely used for the removal of organic pollutants. Increasing the generation rate and concentration of ·OH was the key step for the efficient degradation of organic pollutants. An ultrasound/Fe⁰/EDTA system was proposed for generating ·OH and removing polycyclic aromatic hydrocarbons (PAHs) from textile dyeing sludge. Effect of reaction parameters on ·OH production and resultant degradation of PAHs were examined. Results indicated that the ultrasound/Fe⁰/EDTA system can produce high concentration of ·OH up to 862 μmol·L^-1 at pH 3.0, ultrasonic power of 500 W, Fe⁰ dosages of 15 g·L^-1 and EDTA concentration of 2.0 mmol·L^-1. Iron flocculant remaining in textile dyeing sludge was an important source of Fe²⁺ and Fe³⁺, promoting the spontaneous generation of H₂O₂ and ·OH in the ultrasound/Fe⁰/EDTA system. The PAHs in textile dyeing sludge can be quickly and effectively degraded by the ·OH generated by the ultrasound/Fe⁰/EDTA system, with an average removal efficiency of 77% for ∑₁₆PAHs, and was companied by 10.1% decreases in organic matter content.

Key words：textile dyeing sludge ultrasound zero-valent iron (Fe⁰) polycyclic aromatic hydrocarbons hydroxyl radical