id	keyword
assc-56322	sewage
assc-56322	treatment
assc-56322	tank
assc-56322	water
assc-56322	sets
assc-56322	design
assc-56322	sludge
assc-56322	total
assc-56322	sewage treatment
assc-56322	room
assc-56322	scale
assc-56322	equipment
assc-56322	process