Wastewater treatment system

The utility model discloses a system for treating wastewater, which comprises a neutralizing device provided with a waste acid inlet, an alkali liquor inlet and a neutralized wastewater outlet; the first settling device is provided with an acid-containing wastewater inlet, a neutralized wastewater inlet, a settling agent inlet and a settled mixture outlet; the filtering device is provided with a settled mixture inlet, a waste residue outlet and a waste liquid outlet; the second sedimentation device is provided with a waste alkali inlet, a supernatant outlet and a sedimentation slag outlet; themixing device is provided with a supernatant inlet, an alkali-containing wastewater inlet, a waste liquid inlet and a prepared alkali liquor outlet, and the prepared alkali liquor outlet is connectedwith the alkali liquor inlet. By adopting the system, the pickling wastewater treatment capacity can be reduced by 60%, the water consumption can be saved by 50%, the new alkali consumption can be reduced by 50%, and the syst