英文關鍵字
factory
pumping
filtration
industry
system
wastewater
treatment
supply
biomass
utility
purification
distillery
water
flow
pipe
recycle
cleaning
sustainability
ecology
environment
sanitation
tank
sewer
pollution
technology
dirty
processing
liquid
facility
reservoir
circle
cistern
chemical
reuse
manufactory
drain
filter
waste
garbage
storage
pool
drainage
clearing
plant
sludge
sewage