METHOD OF PRODUCING HYDRAULIC FRACTURING FLUID FROM WASTEWATER OBTAINED DURING SHALE GAS EXTRACTION

摘要

A method of producing hydraulic fracturing fluid from wastewater obtained during the shale gas extraction is disclosed wherein fresh water is added to flowback or produced water until desired salinity is achieved which is then followed by adding H₂O₂ in the amount related to BOD. CaO is used to adjust pH and then sediments are precipitated by intensively mixing them with solution of Na₂CO₃ or K₂CO₃, the precipitates are then separated in a centrifuge and solution of H₂SO₄ is added to the clarified water in order to obtain clarified solution.