VPE 511: Environment and Environmental Hygiene (2+1)

BIOAERATION OR ACTIVATED SLUDGE PROCESS

• In this method screened sewage free from detritus is purified in tanks largely by aerobic bacterial action.
• The bacteria are attached to the particles of ripened or activated sludge which is mixed with the incoming sewage and mixed liquid is kept in continuous motion during its passage through aeration tanks in order to prevent settlement of the sludge, secondly to bring the organic matter in contact with activated sludge and thirdly to supply the bacteria with oxygen.