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Application of nanofiltration membrane technology in oily wastewater Emulsion-containing oily wastewater mainly comes from industries such as metal processing, petroleum, and docks. Its treatment difficulty is quite high because it has characteristics such as high oil content, high wastewater concentration, and difficulty in biodegradation. The problem of treating oily emulsion-containing wastewater urgently needs to be solved and has become a top priority in wastewater treatment. Nanofiltration membrane technology has a significant application effect in the treatment of oily emulsion-containing wastewater. So, what is a nanofiltration membrane? What are the advantages of nanofiltration membrane technology in the treatment of oily emulsion-containing wastewater?