aerial
bed
biological
clarifier
clean
collection
conservation
contaminants
convert
dirty
disposal
effluent
environment
facility
farm
filter
filtration
garbage
industrial
industry
infrastructure
irrigated
irrigation
liquid
management
media
overhead
plant
pollution
process
processing
purification
purified
purify
purity
recirculation
reclamation
recycle
sewage
sewerage
solid
station
stormwater
treatment
trickling
utilities
waste
wastewater
water
works