Black tank odor - switch to macerating toilet?

[Dave5Cs]

The answer is very simple , I pump a small amount of compressed air from the bus into my tanks while driving
I also vent my tanks ( 40mm ) back to a venturi in the engine air intake, before the air cleaner.
I also have a small fish tank air pump that I can use if stopped for some time. the air is pumped in the bottom of the tanks and bubbles up through the contents = no smell   

So you are venting Methane gas into your engine?

[richard5933]

So you are venting Methane gas into your engine?

Sounds like GM did that with the OEM bathroom. Don't think that there's enough methane concentration in the black tank to make much difference. The suction created by the air intake would probably result in the air in the black tank exchanging rapidly as it pulls fresh air in the tank's vent, diluting whatever methane may be present.

[Dave5Cs]

 

[belfert]

My tank vent is 1.5" and I can't really go larger right now because the hole for the vent in my tank is only 1.5".  I could probably have a larger connection installed, but that is a lot of hassle and money.

My plan for next year is to run a new vent to the roof with a fan in line to pull air through.  I will then use the current vent connection to run an air intake to the tank.  I will also look at putting the toilet pipe further into the tank, but I haven't figured out a way to do that yet.  I haven't found any size of pipe that could be glued to the inside of the 3" pipe with no gap.

I have a combined black/grey tank.  I planned separate tank originally, but I couldn't make it work space wise.

[olebusman]

  I have a 4106 with a combined 100 gal tank, 1/12 in kitchen/bathroom sinks going to the corner of the tank. The toilet is a straight  drop. The tank is located at the front of the rear compartment. The kitchen/ bathroom sink drain goes on up to the roof to a boat scupper valve with the rubber flap cut out,in other words flat to the roof. I also have a 1 in hose going from the tank across and down the outside of the rear compartment to about 4 in below the bottom of the bus which I have cut off at a slant like the old draft tubes on the early cars. I have no odor while flushing unless I have a front window open which I rarely do. 

[Gary Hatt - Publisher BCM]

Maybe a  constant small flame at the vent pipe outlet. Should look good at night.

Great idea. Just like a refinery. 

[Gary Hatt - Publisher BCM]

When I run with my driver's window open, my bus stinks especially if I just dumped. Guessing it is creating a negative air pressure in the bus and sucking the fumes from the bathroom up to the window next to my nose. It maybe from all of the cracks around the toilet or something. But because my Sh$% don't stink, it doesn't bother me. 

[windtrader]

Well, gotta weigh in with so much enthusiasm for such a hot topic! 
In fact, this discussion has offered the best explanation about a feature in the bus bathroom. The bathroom is fully enclosed with a spring loaded exterior wall vent, sliding window, and solid door. Inside the bathroom vanity cabinet is a decent sized, variable speed fan that draws in air from a vent to the hallway and exhausts into the vanity base. Based on all the commentary about controlling the smell, I'm thinking the fan provides sufficient positive air pressure to keep the fumes from entering the bathroom and exhausting the foul smells. Nothing else has come close to explaining why the heck it was installed. It's always baffled me just why it is there.

[Toolman]

My black and grey tank vents are linked together and draw there air in through the tank overflow which exits to the ground.

The air bubbler lines are teed together with a non-return valve in the air pump line

The whole system works much better than I ever imagined

I am in Australia and hold my tanks for more than a week in 37deg temps with no smell when I dump

Again, simple you can not have too much air flow through your tanks 

[chessie4905]

Is that degrees or Celsius? Odeor isn't as big a problem at low temperatures.

[Toolman]

Sorry, Celsius. = Warm 

[Toolman]

My Bus is also a little Different

A Tool Van that has a living area in it

https://photos.app.goo.gl/oiJ2LNjqYvWgcRgg6

[sledhead]

Toolman

any inside pics


dave

[chessie4905]

Sharp looking rig.

[Toolman]

https://photos.app.goo.gl/PpNVamXmuKdUUMg46