id	keyword
ajssms-440	wastewater
ajssms-440	household
ajssms-440	management
ajssms-440	town
ajssms-440	household wastewater
ajssms-440	debre
ajssms-440	markos
ajssms-440	wastewater management
ajssms-440	study
ajssms-440	river
ajssms-440	drainage
ajssms-440	environment