Water Tanks/Pools in Sewage Treatment Process
The water tank or water pool in wastewater and sewage treatment generally includes Sedimentation Tank, Regulating Tank, Biochemical Tank and Secondary Sedimentation Tank.
Sedimentation Tank
Sedimentation tank is a structure that remove suspended solids in wastewater by natural sedimentation or coagulation sedimentation of water,purify water quality.
The sedimentation tank is divided into Horizontal Sedimentation Tank and Vertical Sedimentation Tank according to the flow direction. The sedimentation effect depends on the flow rate of water in the sedimentation tank and the retention time of water in the tank.
Regulating Tank
The regulating tank is a pool set in front of the wastewater and sewage treatment facility for the normal operation of pipes, canals and structures, and is not affected by the peak flow or concentration change of wastewater.
It has the following functions:
- Preliminary settlement separation
- Adjust the water quality to achieve balance, which is conducive to the next process
- Adjust the water volume and uneven water inflow
- Realize the function of accident buffering. If there is a small fault in the following treatment process, the wastewater can be stored here for a short time to buffer, so as not to stop the production process because the wastewater cannot be removed
Biochemical Tank
Biochemical tank generally has four types: Anaerobic tank, Aerobic tank, Facultative tank and Biological Contact Oxidation Tank.
Anaerobic Tank
Anaerobic treatment is to use anaerobic bacteria to remove organics in wastewater/sewage, which usually takes a long time.
Anaerobic process can be divided into hydrolysis stage, acidification stage and methanation stage.
Aerobic Tank
Aerobic treatment is the function of aerobic respiration of activated sludge to further decompose organics into inorganic substances and remove pollutants. It is necessary to control the oxygen content and other conditions required by microorganisms so that microorganisms can carry out aerobic respiration with maximum efficiency.
Facultative Tank
The facultative tank is a wastewater and sewage treatment purification tank with both anaerobic and aerobic microorganisms.
Biological Contact Oxidation Tank
The structure of biological contact oxidation tank includes tank body, filler, water distribution device and aeration device.
The working principle is to set filler in the aeration tank as the carrier of biofilm. After oxygenation, the wastewater/sewage to be treated flows through the filler at a certain flow rate, contacts with the biofilm, and the biofilm and suspended activated sludge work together to purify the wastewater.
Secondary Sedimentation Tank
The secondary sedimentation tank is mainly used to separate sludge, clarify, concentrate and return the activated sludge in the mixed solution. Its working effect directly affects the effluent quality and return sludge concentration of the activated sludge system.
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