Thanks David. Neat. That kind of synergy doesn't work as well for a small operation. They are probably selling post-digester garden & field manure/compost by the truckload too.
We took a bus tour through their facility. The bus drives down the center of the long barns. The cows stand there and look at you. No one's allowed out of the bus due to security of not passing diseases along. You are allowed into a clean viewing area where that picture of the turntable I took was taken. Anyhow, on each side of the center isle of the barns is a slightly raised area where the cows stand and lay around all day. It is filled with sand. A tractor comes through and puts out feed for the cows. They eat and poop, etc... in the sand. Every so often (I forget the interval) a tractor comes through with a giant vacuum and they suck up all the sand and replace it with fresh sand. They take the dirty sand to a custom made device that cleans the sand and presses all of the moisture, debris, etc... out of the sand and they re-use it.
Take a look at this satellite image....
https://www.google.com/maps/@41.0297557,-87.2828192,317m/data=!3m1!1e3
Zoom in on it.... The top gray rectangle is a mountain of silage fermenting under tarps covered with tires.... that's a lot of tires! Under that is one that is in use... zoom in and look at the front end loader for scale. To the right of that is a lot full of the sand with another front end loader. And to the right of that, you'll see a white barn with four round tanks to the right of it. I believe those are the methane digesters. Below that, you see a sludge pond.
And this exact same setup is duplicated at least 10 more times, except there aren't digesters at each one. As I recall, some of the facilities are piped together.
Anyhow, its not a far drive from Chicago or Indianapolis, so if anyone ever gets the chance to go, you won't be disappointed.
And they're getting into hogs, now. They raise them, birth them, then sell them off to finishers. That tour is pretty cool, too.