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Biological Wastewater Treatment
with Activated-Sludge Process
Lenntech Water
Treatment Solutions
The picture below shows a simplified flow diagram for biological processes used for wastewater treatment.
The influent wastewater (e.g. municipal
wastewater) goes through several stages in which different compound are removed
out of the wastewater.
For more information about the process,
please click on one of the process stages.
Simplified flow diagram for a biological
wastewater treatment with a activated-sludge process.
In the Bar Rack coarse solids are removed,
such as sticks, rags, and other debris in untreated wastewater by interception.
By use of fine screening even floatable
matter and algae are removed. (p. 314)
In the Grit Chamber grit is removed
consisting of sand, gravel, cinders, or other heavy solid materials that have
subsiding velocities or specific gravities substantially greater than those of
the organic putrescible solids in wastewater. (p. 384)
The Primary Clarifier is a basin where
water has a certain retention time where the heavy organic solids can sediment
(suspended solids). (p.384)
Efficiently designed and operated primary
sedimentation tanks should remove from 50 to 70 percent of the suspended solids
and 25 to 40 percent of the BOD. (p.396)
The influent of the aeration tank is mixed
with activated sludge and in the Aeration Tank the mixed liquor is aerated.
By aerating the mixed liquor the aerobic
processes will be stimulated, the growth rate of bacteria will be must faster.
Because the bacteria deplete the substrate,
flocculation takes place.
The soluble substrate becomes a solid
biomass. These flocks of biomass will sediment in the Secondary Clarifier.
At the end of the process the effluent water is treated to Disinfect it and make it free of disease-causing organisms.
Lenntech Water
Treatment Solutions,
established in 1993, is a design and manufacturing company situated in The
Netherlands, near the Technical University of Delft.
Lenntech provides innovative and sustainable solutions for water
treatment and liquid separation, focusing on industrial applications.
With an experienced team of sales, environmental, chemical, mechanical and
electrical engineers we are specialized in providing turnkey and customized
water purification and membrane separation systems for numerous
different industries and applications.
Our wide range of technologies and extended know-how in all water-related
sectors will guarantee you a cost-efficient solution that will meet your water
quality requirements. Each water and liquid stream are unique, and we
prioritize research and development to keep our solutions
and products in the front line.
https://www.lenntech.com/wwtp/wwtp-overview.htm
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