Grammar correction: “an outhouse”, not “a outhouse”. (While we’re writing about a University, an understatement.)

Some of the employees go across the street to use the flush toilets…….there is NO smell from the CHOI toilets…..but they really do fell like a outhouse toilet (i.e. long drop)

They did needed to connect to the city sewer to pass the building code….the connection is capped inside the building….

No, it’s not. The building and composting toilets are now 12 years old and I don’t see any mention of it smelling.

Odors are avoided eliminated multiple ways:

With the foam-flush toilets, the experience is just like a regular toilet only with almost no water. No odors.

With the open composting toilets, there is a negative pressure (air is sucked into the toilet) from a small, low-power fan. That keeps odors from coming into the room.

The addition of woodchips does two things. First, it covers the feces, so the smell is capped. Second, as noted by other commenters, the carbon in the woodchips mixes with the nitrogen in the urine and feces so that composting happens. Compost with a proper C-N ratio is a very low-odor process that’s entirely different from the septic conditions you’re used to smelling in an outhouse.

So between all these different parts of the system, you end up with no odors.

G’night