When we started we used a hydro seive worked like a dream . Basically fool proof set up . Since then we have changed to grain in fermentation and stripping using steam injection . Now when it's time to dump stripping still we pump the slurry into a honey wagon and out to the pigs it goes . Any extra that pigs don't need is sprayed on the land as fertilizer and worked in .
So imo if you can't sell it to a hog farmer sell it as liquid fertilizer .
If I was going to make a dewater system I would use the air tubes from a airation grain bin . They are 28 inch around and 3 feet long .If set on an incline and turned like a cement mixer.slurry can be pumped into top ,liquid drains thru and the tumble action keepsscreen clear . As it rolls dry material works it's way down and tumbles out bottom of tube . By adjusting the feed rate , the rotation speed , and the rate of incline you should be able to get ur spent grain as dry or wet as you want .
Airation tubes are available In galvanized steel ,aluminum,or stainless steel . At this stage in production there no need for stainless .
Tim