I was cruising thru a June issue of Popular Science and ran across an
award that had been given to this potential onboard sewage treatment
device. I thought it definitely deserved some discussion on these forums.

"What if we could eliminate sewage? The ZLD virtually does just that! It
takes the sewage (solids and liquids), grinds them up and homogenizes the
solids in the liquid.

The ZLD then takes that liquid (that looks like chocolate milk) and
pressurizes it and sprays this liquid into the hot exhaust gas of the
engine.  The hot engine gas vaporizes the liquid, and kills the bacteria
and basically eliminates the sewage with no odor no liquid or no sludge
to handle."

I went looking for a website and found this,
http://www.thezld.com/

Zero Liquid Discharge (ZLD) Sewage Elimination System

I hate to say this gives but it could be a new meaning to no shit.;-)
My only question is the smell?  Could impact the smell of a gas powered
boat, improve the smell of a diesel boat?  I think sail boats lack the
power to push the poop...:-D