Oil and gas field fracturing reverse drainage wastewater (high guanidine gum, high polymer, high suspended matter, and containing petroleum, sulfide and iron, etc.) deep purification, recycling and mixing, chemical oxidation + M+FLO magnetic flocculation sedimentation tank +PUF ultrafilter (integrated skid-mounted equipment),Processing scale >1000m3/d,
Water quality indexes for compounding after purification of fracturing flowback fluid: