My husband just bottled up 40 or more bottles of Oktoberfest beer. There is always an inch or two of "sludge" left in the secondary fermenter, and that goes on the compost pile. In addition to making the worms in the pile very happy, it also adds some micro-nutrients and yeast to the compost mix. If you, or someone you know brews beer, ask for the leavings for your compost pile. Of course, all the neighbors are hanging over the fence, sniffing the aroma off your compost . . . .