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Produced water in the unconventional U.S. Bakken oilfield has become a significant concern since oil and gas production growth has been substantial, and operating costs are increasing. Reusing this considerable amount of produced water has become necessary since the treated water can be used for potable supplies, irrigation, deep well injection, maintenance, and fracking, which improves profits and mitigates groundwater pollution. The total dissolved solids (TDS) in the ND Bakken formation are greater than 300g/l, which is much higher than the concentration of salt in seawater; therefore, it is reasonable to propose selective precipitation to treat the salts found in this formation's produced water. Extracted salts are effective coagulants for removing various contaminants from wastewater. We will extract Mg(OH)2, CaCO3, and CaSO4 from the flowback water and water produced in the Bakken oilfield using lime and soda ash at different dosages and pH values during this project. The extracted Mg(OH)2 and CaCO3 will be used for wastewater treatment and establish their efficiency in removing COD and the nutrients phosphorous and nitrogen from ND wastewater.

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Grand Forks, ND


Presented under the title "Salts Removal as an Effective and Economical Method of Bakken Formation Treatment" at the 2023 UND Graduate Research Achievement Day.

Characterization and treatment of Bakken oilfield produced water