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Aerated Electrolysis for Reducing Impacts of Shale Gas Production Wastewater on Water Sources regarding Disinfection Byproduct Formation
Environmental Science & Technology Letters ( IF 10.9 ) Pub Date : 2018-10-03 , DOI: 10.1021/acs.estlett.8b00482
Hao L. Tang 1 , Linlin Tang 2 , Yuefeng F. Xie 2
Affiliation  

Advances in treatment technologies of shale gas production wastewater are needed to minimize its toxic potency in polluted water sources. An aerated electrolysis (AE) process was employed for treatment of both synthetic and field production wastewaters. Results showed AE led to a 64% reduction in the formation of total disinfection byproducts (DBPs) analyzed in this study and 79% reduction in the formation of more toxic brominated DBPs (Br-DBPs) in polluted natural water in an 8-h treatment, suggesting a potential of scaling up as an in situ pretreatment strategy to reduce negative impacts caused by accidental spills or surface discharges during transportation. The mechanisms for reduced formation of DBPs were associated with bromide oxidation followed by bromine stripping from production wastewater, as evidenced by first-order kinetics on bromide removal. Along with bromide removal that led to the reduction of Br-DBP formation and decreased bromine substitution factors (BSFs), the results also revealed alteration of organic DBP precursors during the AE process by exploring the profile of formed DBP species. Formation of bromate in production wastewater was minimal, as bromate was consistently found below a reporting limit of 500 μg/L during the 8-h AE treatment. The lowest energy consumption at 5.9 kWh/m3 warrants further investigations on process optimization. Application of this technology on site of shale gas exploration is beneficial for water utilities that are facing challenges due to contamination of water sources by production wastewater and inability of conventional water treatment processes in attenuation of DBP precursors.

中文翻译:

曝气电解减少页岩气生产废水对消毒副产物形成的水源影响

为了使页岩气生产废水在污染水源中的毒性最小化,需要在处理技术方面取得进展。曝气电解(AE)工艺用于处理合成废水和现场生产废水。结果表明,在8小时的处理过程中,AE使本研究中分析的总消毒副产物(DBPs)形成减少了64%,在受污染的天然水中使毒性更大的溴化DBP(Br-DBPs)形成减少了79%。 ,这表明有可能将其扩大为就地预处理策略,以减少运输过程中因意外溢出或地面排放而造成的负面影响。减少DBP形成的机制与溴化物氧化,随后从生产废水中汽提溴有关,如去除溴化物的一级动力学所证明的。除了去除溴化物导致Br-DBP形成减少和溴取代因子(BSFs)减少外,结果还通过探索形成的DBP种类的分布揭示了AE过程中有机DBP前体的变化。生产废水中溴酸盐的形成极少,因为在8小时AE处理期间始终发现溴酸盐低于报告的限值500μg/ L。最低能耗5.9 kWh / m 因为在8小时AE治疗期间始终发现溴酸盐低于报告的限量500μg/ L。最低能耗5.9 kWh / m 因为在8小时AE治疗期间始终发现溴酸盐低于报告的限量500μg/ L。最低能耗5.9 kWh / m3需要对过程优化进行进一步调查。这项技术在页岩气勘探现场的应用对水务公司来说是有益的,这些水务公司由于生产废水污染水源以及常规水处理工艺无法降低DBP前驱物而面临挑战。
更新日期:2018-10-04
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