In urban homes with limited space, storing food in caddies for collection is problematic and not always popular. There are also several foods that should not be composted but can be put in a garbage disposal. These include meat, bones and dairy products. Municipal composting does not recover any energy from food waste and since approximately half of all wastewater treated in the U.S. includes anaerobic digestion, disposers can help recover both nutrients for fertilizer as well as carbon for energy.