I thought that Orenco Systems, Inc. sold a vacuum sewer package, but in reviewing their webpage, I found nothing referring to vacuum sewers. Orenco does have a “Ask the Experts” service on their website, and your inquiry could probably be answered by them.
I have no personal experience with vacuum systems, but have heard that they are maintenance intensive, and a real pain in the neck. Others have a lower opinion of them. :>) JWA