id	keyword
ajst-9034	sludge
ajst-9034	treatment
ajst-9034	sewage
ajst-9034	water
ajst-9034	china
ajst-9034	disposal
ajst-9034	technology
ajst-9034	urban
ajst-9034	utilization
ajst-9034	resource
ajst-9034	anaerobic
ajst-9034	soil