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A pilot study of BTEX removal from highly saline water by an advanced electrochemical process
Journal of Water Process Engineering ( IF 7 ) Pub Date : 2020-06-26 , DOI: 10.1016/j.jwpe.2020.101427
Bassam S. Tawabini , Konstantinos V. Plakas , Anastasios J. Karabelas

Results are reported of a systematic study on the performance of an advanced oxidation treatment that couples anodic oxidation (AO) and in situ generation of strong oxidants (Cl2, S2O82−) in the electrolytic cell, for removing benzene, toluene, ethyl benzene, and xylenes (i.e. BTEX) from high salinity waters. A batch-mode pilot electrochemical unit equipped with a boron-doped diamond (BDD) anode and a carbon-PTFE electrode as cathode was employed. Contrary to most published work, special focus was placed on the treatment efficiency, individually for benzene, toluene, ethyl benzene and xylene compounds (m&p-xylene, o-xylene) in a real water matrix (seawater), aiming to evaluate the oxidation mechanisms and to optimize the experimental conditions (such as current density, feed water flow rate, concentration of BTEX) for electrochemical decomposition, using an experimental design based on Face Centered Composite design coupled with Response Surface Methodology. The response surface plots verify the results of the statistical analysis, since electric current is the most detrimental factor to benzene removal, whereas feed flow rate and BTEX initial concentration are the two most significant factors, affecting negatively the removal efficiency of the other four hydrocarbons. Under the optimum conditions (current density ∼74 mA/cm2, feed recirculation flow rate 0.2 m3/h and BTEX initial concentration 2.5 mg/L) xylenes and ethyl benzene were completely (100%) removed within 30 min of electrolysis, more than 90 % of toluene was removed within 60 min, while 70–80 % of benzene was eliminated within 120 min. The study demonstrated the efficiency of electrochemical process for treating recalcitrant organics in concentrated brines.



中文翻译:

通过先进的电化学方法从高盐度水中去除BTEX的初步研究

系统性报告了对阳极氧化(AO)和原位生成强氧化剂(Cl 2,S 2 O 8 2−)在电解池中,用于从高盐度水中去除苯,甲苯,乙苯和二甲苯(即BTEX)。使用了分批模式的先导电化学装置,该装置配备有硼掺杂的金刚石(BDD)阳极和碳PTFE电极作为阴极。与大多数已发表的工作相反,特别关注了在实际水基质(海水)中分别处理苯,甲苯,乙苯和二甲苯化合物(间对二甲苯,邻二甲苯)的处理效率,旨在评估其氧化机理并使用基于面心复合材料设计和响应表面方法的实验设计来优化电化学分解的实验条件(例如电流密度,给水流速,BTEX浓度)。响应表面图验证了统计分析的结果,因为电流是去除苯的最有害因素,而进料流速和BTEX初始浓度是两个最重要的因素,对其他四种烃的去除效率产生负面影响。在最佳条件下(电流密度〜74 mA / cm2,进料再循环流量0.2 m 3 / h和BTEX初始浓度2.5 mg / L)在电解30分钟内完全去除了二甲苯和乙苯(100%),在60分钟内去除了90%以上的甲苯,而120分钟内消除了70–80%的苯。该研究证明了电化学方法处理浓盐水中难降解有机物的效率。

更新日期:2020-06-26
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