Go into the sewage treatment plant and explore the secret of sewage no longer being "dirty"!

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!