Printing and dyeing wastewater treatment system

The utility model discloses a printing and dyeing wastewater treatment system. The sewage treatment device comprises a biological aerated filter, a coagulation reaction tank, a filter tank, an intermediate water tank, a medium filter group, a bag filter group, a precision filter group, a reverse osmosis unit group, a cleaning water tank, a water production tank, a concentrated water tank, a watercollection tank, an air blower, a coagulant dosing tank, a disinfectant dosing tank, a reducing agent dosing tank, a scale inhibitor dosing tank and a pipeline mixer which are sequentially connected.The printing and dyeing wastewater treatment system is simple in structure and reasonable in arrangement, and the printing and dyeing wastewater is continuously treated through cooperation of the biological aerated filter, the filter tank, the medium filter, the bag filter, the precision filter and the reverse osmosis device; all indexes of the treated water sample reach the special discharge limit value of water pollutant