Secondary or activated sludge treatment takes place in aeration basins. The process involves aeration through blowers that pump oxygen into the large tanks to promote microbial growth in the wastewater. These microorganisms require oxygen and organic matter from the settled sewage to thrive and form flocks.
During the aeration process, the microorganisms feed on the organic matter to treat and stabilize the wastewater. Then, the flocks are directed into a separate tank and recirculated into the basin for further decomposition while the excess is pumped into aerobic digesters.
Aerobic digesters carry a combination of primary sludge and secondary activated sludge. During aerobic digestion, bacteria and microorganisms consume organic matter and convert it into carbon dioxide, water and other lower-weight organic compounds. This process involves the use of oxygen for rapid degradation, which is similar to the activated sludge treatment that occurs in the aeration basins.
These systems are highly efficient at removing contaminants, chemicals and other harmful pathogens from wastewater through effective biological treatments.
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