Firefighters have been tackling a blaze at the Northern Waste site in Scunthorpe.
Three fire engines and an aerial appliance were called to the scene on Park Farm Road in the early hours of Saturday 3 September.
Residents were advised to keep their windows closed.
Pictures showed a pile of waste alight and firefighters tackling the blaze from an aerial platform.
A spokeswoman for Humberside Fire and Rescue said the fire was a "reignition" of a previous fire at the site.