Feasibility study of flowback/produced water treatment using direct-contact membrane distillation
Feasibility study of flowback/produced water treatment using direct-contact membrane distillation
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DOI：
10.1080/19443994.2015.1119753
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发表时间：
2016-01-01
影响因子：
1.1
通讯作者：
Li, Ying
中科院分区：
文献类型：
--
作者：
Rao, Guiying;Li, Ying
在不同水热条件和给水组成下，对直接接触式膜蒸馏（DCMD）处理油田回注水的可行性进行了全面考察。实验室规模研究的结果表明，DCMD具有处理合成返排/采出水的巨大潜力。膜水通量随给水温度的升高而增大。在给水温度为80 ℃、TDS为133 g/L、液流流速为0.8L/min时，DCMD的水通量高达43 L/m（2）h，与反渗透海水淡化的水通量相当。此外，DCMD能够处理TDS高达280 g/L的返排水/采出水，从而减少46-88%的废水量。合成返排液/采出水中的油/油脂、悬浮固体和挥发性有机物对DCMD性能的影响最小;因此，DCMD中不需要预处理过程。DCMD的高质量馏出物可用于有益的再利用或未来的水力压裂工作。但是，不建议处理可通过RO处理的低TDS返排水/采出水。相反，DCMD在处理中等和高TDS返排/采出水方面具有更多的技术优势。
The feasibility of applying direct-contact membrane distillation (DCMD) for flowback/produced water treatment was comprehensively investigated under different hydrodynamic and thermal conditions with various feedwater compositions. Results from a bench-scale study suggest that DCMD has a great potential to treat synthetic flowback/produced water. Membrane water flux increased with increasing feedwater temperature. At a feedwater temperature of 80 degrees C, TDS of 133g/L and liquid stream flow rates of 0.8L/min, DCMD showed a water flux as high as 43L/m(2)h, which is comparable to water fluxes of reverse osmosis (RO) for seawater desalination. In addition, DCMD is capable of treating flowback/produced water with TDS up to 280g/L, leading to 46-88% reduction of wastewater volume. Oil/grease, suspended solids, and volatile organics in the synthetic flowback/produced water showed minimal effects on DCMD performance; thus, no pretreatment process is necessary in DCMD. The high-quality distillate of DCMD may be used for beneficial reuse or future hydraulic fracking jobs. However, it is not recommended to treat low-TDS flowback/produced water that can be processed by RO. Rather, DCMD has more technical advantages for treating medium- and high-TDS flowback/produced water.