there is a vent attached to the tank, although i have a septic tank i never seen this, also, the vent is right under the trap of the air exchanger (???)
the conductor for the pump: there is got to be a better way to do that (breaking the concrete cap)
i dont know much about these BIONEST tank, can anyone shed a light??
In this jurisdiction the tanks are vented through the sewer drains and up through the roof vent.
Take a look at the Private sewer system course at http://www.nachi.org/septic-course.htm It only takes 10 hours to do it. Enjoy!