The invention discloses a cold rolling
oily wastewater treatment process, which comprises the following steps of: (1), pretreating thick-oil
wastewater sequentially by filtering of an
oil separation tank and a
paper tape and ultra-
filtration process of a
ceramic membrane, and pre-treating thin-oil
wastewater sequentially by adopting the
oil separation tank, a CAF (
Cavitation Air Flotation) process and a DAF (
Dissolved Air Flotation) process; (2), mixing pre-treated thick-oil
wastewater with the pre-treated thin-oil wastewater, carrying out biochemical treatment by adopting an electrochemical
catalytic oxidation process and an MBR (Membrane
Biological Reactor) process in sequence, controlling the water
inlet temperature of the MBR process to be 20-35 DEG C, controlling the water inlet pH value to be 7-9, and adding oil-munching high-efficiency micro-
organism complex microbial inoculants and MPE (
Metallocene Polyethylene) into an MBR membrane tank; and (3), filtering outlet water (treated through the MBR process) by using a
reverse osmosis membrane, and carrying out deep
desalination treatment so that outlet water reaches emission or industrial production reuse water standard. The invention provides a set of
systematic process specially aiming at treatment and reuse of cold rolling
oily wastewater in steel mills; the COD (
Chemical Oxygen Demand) of treated outlet water is less than 10mg / L; the electrical
conductivity of treated outlet water is less than 50mu s / cm; and oil and
suspended solids are nearly eliminated completely.