A thought - the first that comes to mind:
a concrete mixer arrangement using an inclined barrel and
internal ridges/baffles. The barrel is made to rotate.

Brian Whatcott Altus OK

On 17 Nov 2003 14:43:44 -0800, (Alan Horowitz)
wrote:

I want to macerate sewage which is not liquid. It is excreta mixed
with wood shavings, to be process by composting.

Has this wheel already been invented?