英文關鍵字
activated
aerated
area
basin
big
biology
circle
clean
cleaning
closeup
construction
dirt
dirty
ecology
environment
environmental
facility
filtration
flow
flowing
fluid
industrial
industry
mechanism
mud
panorama
plant
pollution
pool
purification
purified
purity
recycling
reservoir
round
sedimentation
settler
settling
sewage
sludge
storage
tank
technology
treatment
view
waste
wastewater
water