aeration
aerial
aerial view
biological
blackwater
chemical
circle
circles
circular
clarifiers
clean
concrete
contaminants
disinfected
drone
ecology
ecosystem
effluent
engineering
environment
factory
filtration
green
greywater
industrial
industry
liquid
municipal
plant
pollution
ponds
pool
process
purification
recycled
recycling
reservoir
round
separation
sewage
sewer
sludge
systems
tank
top view
treatment
view
waste
wastewater
water
定額
Round clarifiers at wastewater treatment plant, top view from droneの素材 [FY310122429463]
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