Detectives searching for missing RAF gunner Corrie McKeague say material found at the incinerator plant "did not contain human bones".
The site at Great Blakenham, near Ipswich, was examined after the search of a landfill site at Milton, Cambridgeshire, was called off.
The incinerator site was known to contain animal bones from food waste but no human bone material was found.
CorrieMcKeague has been based at RAF Honington in Suffolk and vanished after a night out with friends in Bury St Edmunds last September.
Police still believe the 23-year-old's remains are somewhere on the sprawling landfill site at Milton but called off the search after 20 weeks.
A Suffolk Police spokesman said:
"Suffolk police have engaged experts to examine incinerated waste gathered from the Great Blakenham energy-from-waste facility and it has been confirmed that this matter does not contain human bone material."
Specialist officers from the East Midlands will now review Suffolk Constabulary's investigation to date.
The force spokesman said the area of the Milton landfill that has been searched will be left "in its current state" by agreement with the company that runs the site.
"Cell 22 will not be used for the deposition of waste until the review is concluded," the spokesman said. "Corrie's mother and father have both been updated in relation to all of the above."
Police previously said Mr McKeague had a history of falling asleep in unusual places, including in bins.
A bin lorry was seen on CCTV near Brentgovel Street in Bury St Edmunds around the time Mr McKeague was last seen. It took a route which appeared to coincide with the movements of his phone.
The bin lorry linked to the disappearance of Mr McKeague was initially thought to have collected an 11kg (1st 10lb) load, but police said it was later found to be more than 100kg (15st 10lb).
Mr McKeague's girlfriend April Oliver announced in June that the missing serviceman had become a father with the birth of their daughter.