sewage treatment plant
environmental
building
building exterior
cleaning system
construction
defecate
development
discharged water
drainage
environmentally friendy
facility
factory
filtrate
fresh water
improve
industrial site
industry
modern
modernizing
natural resources
performance
plant
process
progress
project
protect
protection
purified water
purify
rainwater
rainwater drainage
rarefy
refinery
resourses
rwtp
safe
scavenge
slag flotation system
smelter
sustainable
techniques
treatment facility
treatment plant
water
water plant
water purification plant
water treatment plant
wtp