Ledjeri Amina, Yahiaoui Idris, Kadji Hakima, Aissani-Benissad Farida, Amrane Abdeltif, Fourcade Florence
Laboratoire de Génie de l'Environnement (LGE), Faculté de Technologie, Université de Bejaia, 06000, Bejaia, Algeria.
Laboratoire de Génie de l'Environnement (LGE), Faculté de Technologie, Université de Bejaia, 06000, Bejaia, Algeria.
Environ Toxicol Pharmacol. 2017 Jul;53:34-39. doi: 10.1016/j.etap.2017.04.022. Epub 2017 May 1.
In this paper, the major factors affecting the degradation and the mineralization of sulfamethazine by Electro/Fe/peroxydisulfate (PDS) process (e.g. current density, PDS concentration, Fe ions concentration and initial sulfamethazine (SMT) concentration) were evaluated. The relevance of this process as a pretreatment prior to activated sludge culture was also examined. Regarding the impact on SMT degradation and mineralization, the obtained results showed that they were significantly enhanced by increasing the current density and the PDS concentrations in the ranges 1-40mAcm and from 1 to 10mM respectively; while they were negatively impacted by an increase of the initial SMT concentration and the Fe concentration, from 0.18 to 0.36mM and from 1 to 4mM respectively. The optimal operating conditions were therefore 40mAcm current density, 10mM PDS concentrations, 1mM Fe, and 0.18mM SMT. Indeed, under these conditions the degradation of SMT and its mineralization yield were 100% and 83% within 20min and 180min respectively. To ensure a significant residual organic content for activated sludge culture after Electro/Fe/PDS pre-treatment, the biodegradability test and the biological treatment were performed on a solution electrolyzed at 40mAcm, 10mM PDS concentrations, 1mM Fe, and 0.36mM SMT. Under these conditions the BOD/COD ratio increased from 0.07 to 0.41 within 6h of electrolysis time. The subsequent biological treatment increased the mineralization yield to 86% after 30days, confirming the relevance of the proposed combined process.
本文评估了电/铁/过二硫酸盐（PDS）工艺中影响磺胺二甲嘧啶降解和矿化的主要因素（如电流密度、PDS浓度、铁离子浓度和初始磺胺二甲嘧啶（SMT）浓度）。还研究了该工艺作为活性污泥培养预处理的相关性。关于对SMT降解和矿化的影响，所得结果表明，分别在1 - 40mA/cm²和1至10mM范围内增加电流密度和PDS浓度可显著提高降解和矿化效果；而初始SMT浓度从0.18mM增加到0.36mM以及铁浓度从1mM增加到4mM则对其产生负面影响。因此，最佳操作条件为电流密度40mA/cm²、PDS浓度10mM、铁1mM和SMT 0.18mM。实际上，在这些条件下，SMT的降解率和矿化率分别在20分钟和180分钟内达到100%和83%。为确保电/铁/PDS预处理后活性污泥培养有显著的残余有机物含量，对在40mA/cm²、10mM PDS浓度、1mM铁和0.36mM SMT条件下电解的溶液进行了生物降解性测试和生物处理。在这些条件下，电解6小时内BOD/COD比值从0.07增加到0.41。后续的生物处理在30天后将矿化率提高到86%，证实了所提出的联合工艺的相关性。
