One man's 'waste' is another man's compost for soil fertility.

To destroy weed seeds in your field in a biological way, you can use fungus to 'eat' the weed seeds.   But you need carbon to get the fungus to 'bloom'.   Putting 6 ton of finished compost PER acre (thats alot of compost bob!)

The boys over at magic soil show a way how excessive electrical energy from renewable generation can be fixed into compost management.
http://www.magicsoil.com/

Better make sure your 'plan' isn't destroying the soil food web just so you can keep the lights on and drive the SUV for a bit longer.

turn liabilities (corn stover, MSW, rice straw, infected trees, sewage

Corn stalks are fixed into animal protein in many opweations.  Rice straw and cornstalks can be made into tasty or medicinal mushrooms.  Sewage - Ha!  When one looks at what is dumped down the drainpipes by most people, the seperation of the toxic materials from the non-toxic is problematic.  The toxic crap effects the bio-process based fuel conversion,  and random addition of metals like platinum make sewage an explosive depolymarization methods.

Being optimistic is fine, but just looking at the energy side is a recipe for just adding TO the disaster.