environmental
activated
aerated
area
bacterium
basin
big
biology
biomass
bionomics
cement
chemical
circle
clean
clear
concrete
conservation
construction
dirty
ecology
effluent
engineering
environment
factory
frame
group
industry
organism
plant
pollution
pool
purification
purified
purity
recycle
recycled
recycling
rusty
settler
sewage
site
slimy
sludge
steel
storage
tank
treatment
unhygienic
wastewater
water
定額
A group of large sedimentation tanks. Water settling, cleaning in a reservoir with biological organisms at a water station. different degree of wastewater treatmentの素材 [FY310176507925]
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