System for cleaning wastewater

A system for cleaning wastewater, comprising:

• an absorption-biodegradation-denitrification (ABN) reactor;
• a sequential adsorption reactor;
• a disinfection reactor;
• and
• a sludge anaerobic fermentation reactor;
• wherein:
• the ABN reactor is an integrated reactor comprising five secondary treatment units:
• a biosorption tank, an intermediate sedimentation tank, a biologically-enhanced degradation tank, a denitrification biofilter, and a secondary sedimentation tank, which are connected sequentially and separated from each other by a partition wall;
• the biosorption tank is filled with high-load activated sludge;
• the biosorption tank comprises a first water inlet, a first water outlet, a first stirring device, a first aeration device, and a first sludge return port;
• the first water inlet is disposed on a first end of the biosorption tank and the first water outlet is disposed on a second end of the biosorption tank;
• the first stirring device, the first aeration device, and the first sludge return port are disposed in a bottom of the biosorption tank;
• the first water outlet communicates with the intermediate sedimentation tank;
• the intermediate sedimentation tank comprises a first slope plate, a first sludge outlet, and a second water outlet;
• the first slope plate is disposed in the intermediate sedimentation tank;
• the first sludge outlet communicates with a first sludge return pipe and a first sludge outlet pipe;
• the second water outlet is disposed on a rear end of the intermediate sedimentation tank and communicates with the biologically-enhanced degradation tank;
• the first sludge return pipe is connected to the first sludge return port;
• the biologically-enhanced degradation tank is an integrated fixed-film activated sludge system;
• the biologically-enhanced degradation tank comprises a second aeration device, a second sludge return port, a filler interceptor, and a third water outlet;
• the second aeration device and the second sludge return port are disposed in the bottom of the biologically-enhanced degradation tank;
• the filler interceptor is disposed on one end of the biologically-enhanced degradation tank and is connected through the third water outlet to the secondary sedimentation tank;
• the secondary sedimentation tank comprises a second slope plate, a second sludge outlet pipe, and a fourth water outlet;
• the second slope plate is disposed in the secondary sedimentation tank;
• the second sludge outlet pipe is disposed in the bottom of the secondary sedimentation tank and is configured to communicate with a second sludge return pipe and a second sludge outlet pipe;
• the second sludge return pipe is connected to the second sludge return port;
• the fourth water outlet is disposed on one end of the secondary sedimentation tank and is connected to the denitrification biofilter;
• the denitrification biofilter is a downflow denitrification biofilter comprising a carbon source dosing device, an inlet channel, a backwash air inlet, and a backwash water outlet, a denitrification filler, a supporting layer, an air-water distribution device, a backwash water inlet, a water collection channel, and a fifth water outlet;
• the carbon source dosing device, the inlet channel, the backwash air inlet, and the backwash water outlet are disposed on the top portion of the denitrification biofilter;
• the denitrification filler is disposed in the denitrification biofilter;
• the supporting layer, the air-water distribution device, the backwash water inlet, the water collection channel, and the fifth water outlet are disposed in the bottom of the denitrification biofilter;
• the sequential adsorption reactor is a cylindrical reactor comprising secondary treatment units, an overflow pipe, a second water inlet, a third sludge outlet, and a sixth water outlet;
• the second water inlet and the third sludge outlet are disposed in the middle of the bottom of the sequential adsorption reactor;
• the sixth water outlet is disposed on the outside bottom of the sequential adsorption reactor;
• the secondary treatment units each comprises a plurality of adsorption devices;
• the second water inlet is connected to the overflow pipe;
• and the fifth water outlet is connected through a first diversion pipe to the fifth water outlet;
• the disinfection reactor comprises a third water inlet, a disinfection device, a diversion wall, a seventh water outlet, and a drainage pipe;
• the third water inlet is disposed on a first end of the disinfection reactor;
• the disinfection device and the diversion wall are disposed in the disinfection reactor;
• the seventh water outlet is disposed in a bottom of a second end of the disinfection reactor and is connected to a drainage pipe;
• the third water inlet is connected through the second diversion tube to the sixth water outlet;
• and
• the sludge anaerobic fermentation reactor is a cylindrical upflow reactor comprising a gas emission device, a plurality of feed inlets, a second stirring device, a plurality of feed outlets, a sludge circulating pipe, a sludge dewatering device, a liquid collection device;
• the gas emission device is disposed on the sludge anaerobic fermentation reactor;
• the plurality of feed inlets is disposed in the lower part of the sludge anaerobic fermentation reactor;
• the second stirring device is disposed in the sludge anaerobic fermentation reactor;
• the plurality of feed outlets and the sludge circulating pipe are disposed at different water levels marked in the sludge anaerobic fermentation reactor;
• the sludge dewatering device and the liquid collection device are disposed outside of the sludge anaerobic fermentation reactor;
• the plurality of feed inlets is connected to the first sludge outlet pipe, and the second sludge outlet pipe;
• the plurality of feed outlets is sequentially connected to the sludge dewatering device and the liquid collection device via the third diversion tube;
• the liquid collection device is connected to a carbon source feeder via the fourth diversion pipe.