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Effect of pretreatment on fouling propensity of shale gas wastewater in membrane distillation process
Ist Teil von
Desalination and water treatment, 2016-11, Vol.57 (51), p.24566-24573
Ort / Verlag
Abingdon: Taylor & Francis Ltd
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Taylor & Francis Journals Auto-Holdings Collection
Beschreibungen/Notizen
Membrane distillation (MD) has potential to concentrate produced water from the hydraulic fracturing process, leading to reduced disposal cost for shale gas wastewater. However, it is anticipated that MD suffers from severe membrane fouling if it is directly applied to treat such wastewater. Accordingly, this study explored the techniques for pretreatment of shale gas wastewater to mitigated fouling in MD process. Microbubble treatment and filtration were considered in lab-scale experiments. A synthetic shale gas wastewater was prepared based on the compositions of the real produced water and flowback water.Experimental results showed that the microbubble pretreatment could be successfully applied for MD treatment of the synthetic shale gas wastewater. Without pretreatment, flux decline in MD system was found to be very high (>90% decrease within 600 min). After the pretreatment using microbubbles, the flux maintained constant even after 700 min. This was attributed to the removal of colloidal particles in the feedwater by applying microbubbles. The efficiency of the pretreatment was improved by combining microbubble treatment with filtration using 1- mu m filter. Based on these results, MD was applied to treat real wastewaters after pretreatment using a media filter. The flux decline was observed after 800 min of MD operation, suggesting not only particulate fouling but also scale formation should be properly controlled prior to MD treatment.