Ah yes, our liquid waste stream. A great future source of bio diesel, I think, if we put our minds to it. theres a sorta new process, thermal depolymerization process, being developed in different ways by several companies. one turns 200 ton of turkey guts and feathers into bio diesel out in carthage, Mo. at the butter ball turkey slaughter house. potentially it too can precess the solids in a waste stream,. after that, the waste water could be bio filtered thru restored wetlands, or artifical wetlands, bogs, planted to best consume any organic and heavy metal waste still in the water, before flowing to a reservoir or lake. plenty of those have been built to prove the point. just not enough to make a difference. restored wetlands are being used on large scale to clean up the nitrate/phosphate runoff from sugar cane farms and cattle ranching around the everglades. and is cleaning up the glades. it can work.
Or algae farms. we can use algae pond systems to grow and harvest strains of algae that can produce more bio fuel, while consuming CO2 from the air.
but if we cant get enough people to do basic recylcing on their own, the down stream solutions could make up for it. everything starts at the store. just buy less, and waste less.