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A mobile, modular and rapidly-acting treatment system for optimizing and improving the removal of non-aqueous phase liquids (NAPLs) in groundwater
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2018-08-16 , DOI: 10.1016/j.jhazmat.2018.08.044
Yizhi Sheng , Xu Zhang , Xiaobo Zhai , Fang Zhang , Guanghe Li , Dayi Zhang

Non-aqueous phase liquids (NAPLs) in pumped groundwater are highly variable, challenging the selection of above-ground treatment strategies in pump-and-treat system. Adjustable systems with multiple treatment units are urgently required. In the present study, a mobile, modular and rapidly-acting treatment system was developed to treat groundwater contaminated by NAPLs at a chemical industrial site. The system integrated four units of coagulation sedimentation, air flotation, air stripping and chemical oxidation. During a 3-month onsite operation, the composition of groundwater NAPLs had huge fluctuations and different treatment units had unique advantages in eliminating some components. For instance, air stripping exhibited satisfactory removal efficiencies (>80%) for short-chain petroleum hydrocarbons and chloroalkanes, but poor performance for others comparing to other units. A decision-making tool and a central control system were further developed to combine and adjust the four units in proper orders, achieving satisfied removal efficiency (70-90%) for multi-component NAPLs, regardless of composition fluctuation. These findings raise the state-of-the-art modular and rapidly-acting groundwater treatment system to clean up NAPLs contaminated groundwater through pump-and-treat strategy, help in better understanding on the decision and management to improve the treatment performance, and provide guidelines for its implication at other sites contaminated with multi-component NAPLs or undergoing accidental contamination.



中文翻译:

一种移动式,模块化且作用迅速的处理系统,用于优化和改善地下水中非水相液体(NAPL)的去除

抽水地下水中的非水相液体(NAPL)高度可变,这给抽水处理系统中地上处理策略的选择提出了挑战。迫切需要带有多个处理单元的可调系统。在本研究中,开发了一种可移动,模块化且作用迅速的处理系统,用于处理化学工业场所中被NAPL污染的地下水。该系统集成了凝结沉淀,气浮,气提和化学氧化四个单元。在为期3个月的现场操作中,地下水NAPL的组成具有很大的波动,并且不同的处理单元在消除某些成分方面具有独特的优势。例如,对于短链石油烃和氯代烷烃,空气汽提显示出令人满意的去除效率(> 80%),但与其他单位相比,其他人的表现不佳。进一步开发了决策工具和中央控制系统,以适当的顺序组合和调整四个单元,无论成分波动如何,都能实现多组分NAPL的满意去除效率(70-90%)。这些发现提出了最先进的模块化,快速作用的地下水处理系统,可通过泵和处理策略来清除受污染的NAPL地下水,有助于更好地了解决策和管理方法,以改善处理效果,并提供有关其在受多组分NAPL污染或遭受意外污染的其他地点的影响的准则。进一步开发了决策工具和中央控制系统,以适当的顺序组合和调整四个单元,无论成分波动如何,都能实现多组分NAPL的满意去除效率(70-90%)。这些发现提出了最先进的模块化,快速作用的地下水处理系统,可通过泵和处理策略来清除受污染的NAPL地下水,有助于更好地了解决策和管理方法,以改善处理效果,并提供有关其在受多组分NAPL污染或遭受意外污染的其他地点的影响的准则。进一步开发了决策工具和中央控制系统,以适当的顺序组合和调整四个单元,无论成分波动如何,都能实现多组分NAPL的满意去除效率(70-90%)。这些发现提出了最先进的模块化,快速作用的地下水处理系统,可通过泵和处理策略来清除受污染的NAPL地下水,有助于更好地了解决策和管理方法,以改善处理效果,并提供有关其在受多组分NAPL污染或遭受意外污染的其他地点的影响的准则。

更新日期:2018-08-17
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