I used to work as a shipboard engineer, which meant that occasionally I had to deal with the sewage system.
A trick I learned for avoiding the smell is to take some Vicks vapor rub and put it under your nose.
Now that I work in an engineering office, there are a handful of people that do not smell like roses. Lots of old man breath, fish lunch breath, and generally sweaty men. This is a trick I've implemented and has worked pretty well.
Good luck!
DD1: June '16 DD2: March ‘19 :::: Married since 2011 :::: USN Wife ::::
Re: FYI - a trick for dealing with smelly smells