Curious?
Every day when we flush the toilet, take a shower, wash dishes...
Where does the sewage that enters the sewer go?
Today, the Dazu urban sewage treatment plant
is open to the public on the cloud
Let's explore the secret of sewage no longer being "dirty"!
Process 1: Coarse screen room and water inlet pump room
Intercept large debris and floating objects in the sewage entering the factory
Lift the raw sewage from deep underground
to the surface treatment structure
Process 2: Fine screen room and cyclone sand settling tank
Removes larger sand particles (entrained), hair and short fiber fluff in sewage
Removes sand particles with a particle size of ≥0.2mm in sewage
Separates inorganic sand particles from organic matter
Process 3: Primary sedimentation tankRemove scum
Remove some SS and COD
Also can homogenize water quality
Process 4: Improved oxidation ditch
Utilize the different functions of anaerobic, anoxic and aerobic zones
Mainly degrade BOD5, COD and nitrification and denitrification
Carry out biological nitrogen and phosphorus removal.
Process 5: Secondary sedimentation tank
Process 6: Deep processing
(fine screen room, filter cloth filter tank)
Remove small particles in sewage
Filter the effluent from the secondary sedimentation tank
Further reduce
SS, TN, TP and other pollutant indicators in the water
Process 7: Contact disinfection tank
Kill bacteria and viruses that may be contained in factory wastewater
Process 8: Water discharge
The sewage goes to the sewage treatment plant for a "trip"
Part of it turns into gas (carbon dioxide, etc.) and is discharged into the air
Part of it settles and turns into sludge
It is handled by a qualified company
Δ Third-party online water quality monitoring
The remaining water
The effluent water quality must meet
the requirements of the Class A standard of the comprehensive sewage discharge standard
before it can be discharged
Theme of World Environment Day 2024
"Beautiful China, I am an actor"
If everyone
saves water
loves water
cherishes water
then we can
build a tower from sand
build a river from drops
take action now!