Method for treating mixed wastewater from pharmaceutical chemical industry park

A method for treating mixed wastewater from pharmaceutical chemical industry parks, comprising the steps of

• a) introducing mixed wastewater from pharmaceutical chemical industry parks into a regulation tank for regulation of water flow and water quality, and then into a hydrolysis tank which comprises a hanged filler and employs upflow water distribution;
• b) introducing effluent from said hydrolysis tank into an anaerobic tank which employs upflow water distribution and comprises a perforated pipe as a water distribution pipe at the bottom thereof and a three-phase separation zone comprising a three-phase separator on the top thereof, a circulating reflux device being disposed under said three-phase separator and circulating effluent reentering the bottom of said anaerobic tank using an external circulating pressure pump;
• c) introducing effluent from said anaerobic tank into a moving bed biofilm reactor (MBBR) comprising a suspended filler and an aeration device at the bottom thereof;
• d) introducing effluent from said moving bed biofilm reactor into a biological aerated filter in the form of upper spraying, said biological aerated filter comprising a ceramic filler, at the bottom thereof being disposed with a support plate, a water outlet pipe, and a backwash water inlet pipe, on the top thereof being disposed with a sieve for preventing the overflow of said ceramic filler during backwashing and a backwash water outlet pipe, effluent therein being supernatant clear water;
• and
• e) introducing said effluent from said biological aerated filter into a sedimentation tank and a coagulation reaction tank in sequence for precipitation.