Venting a sewage basin and ejector pump
I have a finished basement with an unfinished basement bath. It is plumbed under the slab to a standard sewage basin. The problem lies in venting the basin if I wish to finish the bathroom and install a sewage pump. I do not have access to any pre-existing vent stacks, but do have easy access to the main drain line.
I realize I can't use an AAV due to the closed system, but is it possible to vent to the top of the main drain line? The line is never "full" unless there's a downstream backup (yet to happen). Wouldn't this essentially be the same as venting to the vent stack?
First question, would this work... Second, would it be against code...
Thanks in advance