Application of intensified Fenton oxidation to the treatment of sawmill wastewater.
Application of intensified Fenton oxidation to the treatment of sawmill wastewater.
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DOI：
10.1016/j.chemosphere.2014.02.062
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发表时间：
2014-08
期刊：
影响因子：
8.8
通讯作者：
M. Munoz;G. Pliego;Z. D. de Pedro;J. Casas;J. J. Rodriguez-J.
中科院分区：
文献类型：
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作者：
M. Munoz;G. Pliego;Z. D. de Pedro;J. Casas;J. J. Rodriguez-J.
研究了芬顿法处理锯木厂废水的应用。锯木厂废水的特征在于中等的COD负荷（1.3g L−1）、高生态毒性（1.40毒性单位）和几乎可以忽略的BOD/COD比（5 × 10−3），这是由于存在不同的杀真菌剂，例如丙环唑和3-碘-2-丙炔基丁基氨基甲酸酯，被分类为不可生物降解的废水。关键芬顿变量的影响（温度（50-120 °C），催化剂浓度（25-100 mg L−1Fe3+），H2 O2剂量为满足当地工业废水排放限值要求，在较短的反应时间内实现H2 O2的高效消耗，研究了H2 O2投加方式（投加量为化学计量的1倍和2倍）对COD去除和矿化的影响。1 h）。升高温度明显提高了氧化速率和矿化度，在化学计量的H2 O2剂量和25 mg L− 1Fe 3+下，在120 °C下1 h后，实现了60%的COD降低和50%的矿化。在整个反应时间内多次添加H2 O2的分布明显有利于避免竞争性清除反应，从而实现更高的H2 O2消耗效率（XCOD> 80%）。主要副产物为无毒的短链有机酸（乙酸、草酸和甲酸）。因此，应用芬顿工艺可以以相对较低的成本达到工业废水排放到当地下水道系统的当地限制。
The application of the Fenton process for the treatment of sawmill wastewater has been investigated. The sawmill wastewater was characterized by a moderate COD load (≈3 g L−1), high ecotoxicity (≈40 toxicity units) and almost negligible BOD/COD ratio (5 × 10−3) due to the presence of different fungicides such as propiconazole and 3-iodo-2-propynyl butyl carbamate, being the wastewater classified as non-biodegradable. The effect of the key Fenton variables (temperature (50–120 °C), catalyst concentration (25–100 mg L−1Fe3+), H2O2dose (1 and 2 times the stoichiometric dose) and the mode of H2O2addition) on COD reduction and mineralization was investigated in order to fulfill the allowable local limits for industrial wastewater discharge and achieve an efficient consumption of H2O2in short reaction times (1 h). Increasing the temperature clearly improved the oxidation rate and mineralization degree, achieving 60% COD reduction and 50% mineralization at 120 °C after 1 h with the stoichiometric H2O2dose and 25 mg L−1Fe3+. The distribution of H2O2in multiple additions throughout the reaction time was clearly beneficial avoiding competitive scavenging reactions and thus, achieving higher efficiencies of H2O2consumption (XCOD≈ 80%). The main by-products were non-toxic short-chain organic acids (acetic, oxalic and formic). Thus, the application of the Fenton process allowed reaching the local limits for industrial wastewater discharge into local sewer system at a relatively low cost.