Hydraulic fracturing wastewater in Germany: composition, treatment, concerns

When studying technical methods and measures that could be applicable for flowback treatment, recycling and/or disposal, it is important to characterize the volumes and composition of hydraulic fracturing flowback. In this work, water volumes and water quality data are considered for investigating flowback at three selected drilling sites in Germany. The analysis highlighted an increase of chloride concentrations up to saturation limit over the time. High salinity concentrations were used as indicator for estimating the percentage of hydraulic fracturing fluid and formation water in flowback. For the studied shale gas well a proportion of formation water, 69 %, and hydraulic fracturing fluid, 31 %, in flowback were derived. Thus, 92 % of the hydraulic fracturing fluid remained in the formation. The physical/chemical properties of flowback were categorized in groups to enable the allocation of applicable treatment methods. The analysis revealed that no single technology can meet suitable effluent characteristics, thus two or more treatment systems might be used in series operation. In particular, for flowback containing high salinity concentrations the only treatment options are evaporation or crystallization. Hence, methodological distinctions need to be made between concentration, elimination, disposal and recycling, whereby for the existing concentrate treatment or disposal measures need to be completed and scaled up into the process.

[1]  R. B. Smart,et al.  Total arsenic and selenium analysis in Marcellus shale, high-salinity water, and hydrofracture flowback wastewater. , 2012, Chemosphere.

[2]  Rolf Altenburger,et al.  Proposal for applying a component-based mixture approach for ecotoxicological assessment of fracturing fluids , 2013, Environmental Earth Sciences.

[3]  John W. Ely,et al.  Game Changing Technology For Treating And Recycling Frac Water , 2011 .

[4]  A. Fakhru’l-Razi,et al.  Review of technologies for oil and gas produced water treatment. , 2009, Journal of hazardous materials.

[5]  John A. Veil,et al.  Produced Water Volume Estimates and Management Practices , 2011 .

[6]  T. Engelder,et al.  Natural gas: Should fracking stop? , 2011, Nature.

[7]  K. J. Reddy,et al.  Trace element chemistry of coal bed natural gas produced water in the Powder River Basin, Wyoming. , 2007, Environmental science & technology.

[8]  K. Schroeder,et al.  Geochemical and strontium isotope characterization of produced waters from Marcellus Shale natural gas extraction. , 2012, Environmental science & technology.

[9]  Roger R. Myers,et al.  Marcellus Shale Post-Frac Flowback Waters - Where is All the Salt Coming from and What are the Implications? , 2009 .

[10]  D. Dzombak,et al.  Water Management Challenges Associated with the Production of Shale Gas by Hydraulic Fracturing , 2011 .

[11]  D. Pierce,et al.  Water Recycling helps with Sustainability , 2010 .

[12]  Kerri L. Hickenbottom,et al.  Forward osmosis treatment of drilling mud and fracturing wastewater from oil and gas operations , 2013 .

[13]  Amy E. Childress,et al.  Forward osmosis: Principles, applications, and recent developments , 2006 .

[14]  Ulrich Ewers,et al.  Toxikologische Bewertung von Fracking-Fluiden , 2012, Wasser und Abfall.

[15]  J. M. Evans,et al.  Sources, Characteristics, and Management of Produced Waters from Natural Gas Production and Storage Operations , 1992 .

[16]  George E. King,et al.  Hydraulic Fracturing 101: What Every Representative, Environmentalist, Regulator, Reporter, Investor, University Researcher, Neighbor and Engineer Should Know About Estimating Frac Risk and Improving Frac Performance in Unconventional Gas and Oil Wells , 2012 .

[17]  Hansen Br,et al.  Review of Potential Technologies for the Removal of Dissolved Components from Produced Water , 1994 .

[18]  James P. Ray,et al.  Produced Water: Technological/Environmental Issues and Solutions , 1993 .

[19]  P. Horner,et al.  Shale Gas Water Treatment Value Chain - A Review of Technologies, including Case Studies , 2011 .

[20]  P. Daling,et al.  Partitioning of semi-soluble organic compounds between the water phase and oil droplets in produced water. , 2004, Marine pollution bulletin.