Oil-based needle coke production wastewater treatment system

The utility model relates to an oil-based needle coke production wastewater treatment system which comprises an oil separation tank, a production wastewater regulating tank, a desulfurization tank, an air flotation system, an A/O biochemical tank, a secondary sedimentation tank, an improved Fenton reaction sedimentation tank and a sludge storage tank which are sequentially communicated, an oil skimming machine and an oil drain pump are arranged in the oil separation tank, the high-concentration wastewater temporary storage tank is communicated with the production wastewater adjusting tank, a ferrous ion dosing device is arranged on the desulfurization tank, and a degreasing agent dosing device, a PAM dosing device and a PAC dosing device are arranged on the air flotation system. A Fenton reagent adding device is arranged on the improved Fenton reaction sedimentation tank, and the air flotation system, the secondary sedimentation tank and the improved Fenton reaction sedimentation tank are all connected with a