A ferrous oxalate mediated photo-Fenton system: toward an increased biodegradability of indigo dyed wastewaters.
A ferrous oxalate mediated photo-Fenton system: toward an increased biodegradability of indigo dyed wastewaters.
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DOI：
10.1016/j.jhazmat.2012.10.032
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发表时间：
2012-12
影响因子：
13.6
通讯作者：
M. Vedrenne;R. Vasquez-Medrano;D. Prato-Garcia;B. Frontana-Uribe;M. Hernández-Esparza;J. M. de Andrés
中科院分区：
文献类型：
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作者：
M. Vedrenne;R. Vasquez-Medrano;D. Prato-Garcia;B. Frontana-Uribe;M. Hernández-Esparza;J. M. de Andrés
本研究评估了草酸亚铁介导的光Fenton预处理靛蓝染色废水的适用性，以产生可生物降解的足够的污水，可能是来自传统的生物工艺。在间歇操作条件下，在复合抛物面浓缩器（CPC）中用草酸亚铁和过氧化氢进行光化学处理。该反应在自然pH条件（5-6）下进行了研究，靛蓝浓度在6.67-33.33mgL-1范围内，使用固定的H2O 42-/Fe 2+质量比（C2 O 42-/Fe 2 +=35），并评估了低（257 mgL-1）和高（1280 mgL-1）H2 O2浓度下系统的生物降解性。为了寻求靛蓝染料废水处理的最佳条件，进行了实验设计，包括在统计表面响应方法。该分析表明，最好的总有机碳（TOC）的去除效率，获得低过氧化物剂量。一般来说，在20 kJL-1之后，几乎每种处理过的废水都从0.4的BOD 5/COD值增加了其生物降解性。这种生物降解性的增加被证实的短链羧酸作为中间产物的存在下，并通过矿化的有机氮成硝酸盐。最后，卤虫的LC 50的总体下降表明成功的解毒的污水。
This study assessed the applicability of a ferrous oxalate mediated photo-Fenton pretreatment for indigo-dyed wastewaters as to produce a biodegradable enough effluent, likely of being derived to conventional biological processes. The photochemical treatment was performed with ferrous oxalate and hydrogen peroxide in a Compound Parabolic Concentrator (CPC) under batch operation conditions. The reaction was studied at natural pH conditions (5–6) with indigo concentrations in the range of 6.67–33.33mgL−1, using a fixed oxalate-to-iron mass ratio (C2O42−/Fe2+=35) and assessing the system's biodegradability at low (257mgL−1) and high (1280mgL−1) H2O2concentrations. In order to seek the optimal conditions for the treatment of indigo dyed wastewaters, an experimental design consisting in a statistical surface response approach was carried out. This analysis revealed that the best removal efficiencies for Total Organic Carbon (TOC) were obtained for low peroxide doses. In general it was observed that after 20kJL−1, almost every treated effluent increased its biodegradability from a BOD5/COD value of 0.4. This increase in the biodegradability was confirmed by the presence of short chain carboxylic acids as intermediate products and by the mineralization of organic nitrogen into nitrate. Finally, an overall decrease in the LC50for Artemia salina indicated a successful detoxification of the effluent.