Ledjeri Amina, Yahiaoui Idris, Aissani-Benissad Farida
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.
J Environ Manage. 2016 Dec 15;184(Pt 2):249-254. doi: 10.1016/j.jenvman.2016.09.086. Epub 2016 Oct 6.
The removal of tetracycline (TC) by electro/Fe/peroxydisulfate process combined to the biological treatment is reported in this study. Effect of current density, peroxydisulfate (PDS) concentration, Fe ions concentration and initial tetracycline concentration were investigated. The results indicated that the removal efficiency of TC increased with increasing current density and decreases with tetracycline initial concentration. This effect is attributed to the competition of TC and electrogenerated intermediate compounds for the consumption of oxidizing SO radicals. The TC degradation efficiency was improved significantly when the PDS and Fe concentrations increased from 1 to 10 mM and 1-2 mM, respectively. Above 10 mM PDS and 2 mM Fe concentrations, a decrease of TC degradation efficiency was observed. The optimal operating conditions were: 2 mM Fe, 0.06 mM TC, 10 mM PDS concentrations and 40 mA cm current density. Under these conditions a total degradation of TC within only 40 min of reaction time and 98% of mineralization yield after 3 h electrolysis were obtained. The biodegradability of the solution after electro/Fe/peroxydisulfate pre-treatment showed that BOD/COD ratio increased from 0.00 initially to 0.42, 0.46 and 0.83 after 4 h, 5 h and 6 h, respectively, namely above the limit of biodegradability (0.4). The enhancement of biodegradability initially from 0.00 to 0.42 and 0.46 after 4 h and 5 h of electrolysis respectively, was confirmed by the biological treatment, since 77.51% and 92.54% of the dissolved organic carbon was removed respectively by coupling Electro/Fe/PDS pre-treatment and a biological treatment.
本研究报道了通过电/铁/过硫酸盐工艺结合生物处理去除四环素（TC）的情况。研究了电流密度、过硫酸盐（PDS）浓度、铁离子浓度和四环素初始浓度的影响。结果表明，TC的去除效率随电流密度的增加而提高，随四环素初始浓度的增加而降低。这种影响归因于TC与电生成的中间化合物对氧化SO自由基消耗的竞争。当PDS和铁浓度分别从1 mM增加到10 mM和1 - 2 mM时，TC降解效率显著提高。在PDS浓度高于10 mM和铁浓度高于2 mM时，观察到TC降解效率下降。最佳操作条件为：2 mM铁、0.06 mM TC、10 mM PDS浓度和40 mA/cm²电流密度。在这些条件下，仅在40分钟的反应时间内TC就完全降解，电解3小时后矿化率达到98%。电/铁/过硫酸盐预处理后溶液的生物降解性表明，BOD/COD比值从最初的0.00分别在4小时、5小时和6小时后增加到0.42、0.46和0.83，即高于生物降解性极限（0.4）。通过生物处理证实了电解4小时和5小时后生物降解性最初分别从0.00提高到0.42和0.46，因为通过电/铁/过硫酸盐预处理与生物处理相结合分别去除了77.51%和92.54%的溶解有机碳。
