I've a composting toilet in my 20 ft yurt, used by two people full time (except work hours). It's a C-Head Boonjon, very different from the Envirolet. It separates the waste streams--liquids go into gallon jugs (3+ gal/week/person), solids go into a dry carbon (peat, coir, sawdust, etc). TP clumps up the solids a bit, so I do the S. American thing & put it in a tiny waste basket (closing lid) next to the toilet. Without TP solids get emptied around every 3 weeks into my dirty compost hole (covered once full & will get a tree planted; includes cat litter & TP; fills roughly every 3 months). With TP solids get emptied every 1-2 weeks. Liquids can be used as fertilizer or added back to the dirty compost to balance out the dry carbon (cat litter wood pellets).
My toilet isn't vented outside yet--one of this week/weekend's projects. It doesn't make any sustained smells (unless you open the lid & sniff right there, 'earthy' smell if working right), but normal "bathroom" smells do occur upon initial solids deposit
During the summer with lots of yurt draftiness, it wasn't noticeable. Now I've improved the yurt seal, the initial smell is somewhat strong but disappears in a couple minutes. I get coir bricks & expand them with water, so I need a little air flow through the toilet & out of the yurt to dry the solids & coir more--it would also pull any smells out & the dryness would decrease the emptying frequency.
From the looks of it, your Envirolet has a pretty sophisticated setup. But it mixes liquids & solids, so requires a _lot_ of air & some heat for evaporating--four people would be something like 1.5 gal/day for the liquids part, let alone the solids drying.
Envirolet has a regular & a turbo fan available for the vent system. Their prices look a little high to me though... With a little ingenuity you can splice in small axial fans to boost the vent flow--little used computer ones should be ~$5 or less. Sofasco also has tons of different fans (cfm, ac/dc, etc), but with shipping you end up at $30-50; or any of your standard online hardware/tools places should have them. Or electronics dealers (digikey, mouser, newark).
Two other things come to mind. First is installing a liquids drain to a mini-leach field--Envirolet webpage hints at this. Second is that males could use gallon jugs for liquids collection, reducing the liquids needing evaporating. There's also the S. American thing with the toilet paper. But your actual problem/question wasn't exactly clear
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