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biological purification water sewage treatment plant waste water bubbles in the tank, activated sludge industrial
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biological
purification
water
sewage
treatment
plant
waste
bubbles
tank
activated
sludge
industrial
wastewaters
process
using
aeration
biology
floc
composed
protozoa
bacteria
bacterium
contamination
pollution
wastewater
purify
reactor
biomass
bioreactor
brown
clarifier
cleaning
organic
nitrogen
phosphorus
compounds
dirty
environment
excrement
factory
filter
industry
pool
processing
recycling
sanitation
sedimentation
toxic
active
infection