date:Oct 30, 2012
ing. The solids are pressed and dried and made into animal feed, commonly known as meat by-products and bone meal.
In 1997, animal-feed manufacturers and farmers experimented with dehydrated food garbage fats emptied from restaurant fryers and grease traps, cement-kiln dust, newsprint and cardboard derived from plant cellulose, and even human sewage sludge to use for animal feed.