摘要
染料废水中含有大量难生物降解的卤代有机物合成中间体,合成卤代有机物在废水的生物处理过程中容易被吸附到剩余污泥中,如不能妥善处理会引起生态健康风险。研究了零价铁还原、芬顿氧化及其组合技术对染料企业剩余污泥中AOX(可吸附有机卤代物)的去除效果,优化了处理条件,解析了去除机理。结果表明,铁粉投加量为5 g·L^(-1),厌氧反应30 d时,零价铁还原对污泥中AOX降解率仅为24.7%;Fe2+投加量0.059 mol·L^(-1),H2O_2投加量0.89 mol·L^(-1),芬顿氧化1.5 h时,污泥中AOX去除率提高至73.7%;投加2 g·L^(-1)的铁粉,还原30 d后再进行芬顿反应,则污泥中AOX去除率可达到90.3%。GC-MS分析结果表明,污泥中的主要AOX物质为2,6-二氯-4-硝基苯胺,该物质经过零价铁还原与芬顿氧化组合工艺处理后,比直接芬顿氧化能得到更有效的去除。
Dye wastewater contains a variety of halogenated organic synthetic intermediates which are difficult for bio-degradation. These halogenated organic compounds are readily adsorbed onto activated sludge in a wastewater biological treatment process,and thereby pose risks to ecosystems and human health if discharged without proper treatment. In this study,excess activated sludge of a dye wastewater treatment plant was treated with zero-valent iron reduction,Fenton oxidation and zero-valent iron reduction followed with Fenton oxidation. The AOX（adsorbable organic halogens） removal rate was compared,the operation conditions were optimized and the removal mechanisms were investigated. The results showed that only 24. 7% of AOX was removed when the sludge was reduced for 30 d with 5 g · L^-1of zero-valent iron powder under anaerobic environment. The removal rate of AOX was increased to 73. 7% when 0. 059 mol·L^-1of Fe2 ＋and 0. 89 mol·L^-1of H2O_2 was dosed for 1. 5 h of Fenton oxidation. The AOX removal rate was further increased to as high as 90. 3% when the sludge was reduced in an anaerobic environment for 30 d with 2 g·L^-1of zero-valent iron powder and then oxidized with Fenton reagent. GC-MS analysis revealed that 2,6-dichloro-4-nitroaniline was of the principal AOX component,which was efficiently removed by the combined process of zero-valent iron reduction and Fenton oxidation.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第9期5227-5232,共6页
Chinese Journal of Environmental Engineering
基金
嘉兴市科技计划项目(2016AY23099)
南湖区科技计划项目(2015QS01)
浙江清华长三角研究院青年骨干基金A类(2015)
