Coupling Fenton and biological oxidation for the removal of nitrochlorinated herbicides from water.
Coupling Fenton and biological oxidation for the removal of nitrochlorinated herbicides from water.
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DOI：
10.1016/j.watres.2013.11.033
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发表时间：
2014-02
期刊：
影响因子：
12.8
通讯作者：
S. Sanchis;A. Polo;M. Tobajas;Juan J. Rodríguez;Á. F. Mohedano
中科院分区：
文献类型：
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作者：
S. Sanchis;A. Polo;M. Tobajas;Juan J. Rodríguez;Á. F. Mohedano
研究了芬顿与生物氧化相结合去除水溶液中的硝基氯化除草剂甲草胺、莠去津和敌草隆。 H2O2 剂量在与初始化学需氧量 (COD) 相关的化学计量的 20% 至 100% 之间变化。对芬顿氧化废水的生态毒性、生物降解性、总有机碳 (TOC)、COD 和中间副产物进行了分析。尽管化学步骤对生态毒性的负面影响可以忽略不计，甚至轻微负面影响，但生物降解性显着提高。在甲草胺和莠去津的情况下，在化学计量 H2O2 剂量的 60% 下工作可以获得高度可生物降解的废水。对于敌草隆来说，该剂量甚至更低（化学计量的 40%）。随后的生物处理在序批式反应器 (SBR) 中进行，芬顿-生物处理相结合，COD 减少量高达 80% 左右。
The combination of Fenton and biological oxidation for the removal of the nitrochlorinated herbicides alachlor, atrazine and diuron in aqueous solution has been studied. The H2O2dose was varied from 20 to 100% of the stoichiometric amount related to the initial chemical oxygen demand (COD). The effluents from Fenton oxidation were analyzed for ecotoxicity, biodegradability, total organic carbon (TOC), COD and intermediate byproducts. The chemical step resulted in a significant improvement of the biodegradability in spite of its negligible or even slightly negative effect on the ecotoxicity. Working at 60% of the stoichiometric H2O2dose allowed obtaining highly biodegradable effluents in the cases of alachlor and atrazine. That dose was even lower (40% of the stoichiometric) for diuron. The subsequent biological treatment was carried out in a sequencing batch reactor (SBR) and the combined Fenton-biological treatment allowed up to around 80% of COD reduction.