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عمومی::
پسماند سبز
There are three: (1) waste-to-energy biogas gen- eration using sludge, organic food waste, and green waste; (2) neighborhood- and block-scale cogeneration using biofuels and combustible waste; and (3) solar photovoltaic and wind retrofits on public lands (parks, freeways, streets, parking lots) or on leased private lands, such as farms.
The waste-to-energy systems using sludge, organic garbage, and green waste have been discussed earlier from the primary perspective of energy supply systems, not from the perspective of "growing" the fuel source.
Already in the United States 57 percent of the 33 million tons of yard trimmings generated each year are either composted or combusted to create electricity and heat.36 These data demonstrate that many cities recognize green waste as a resource, not waste, and that mature, cost-effective technologies exist for its conversion to energy.
the amount of green waste (yard trimmings) by expanding the eco-services of the urban landscape does not represent a burden on a city's waste stream but is an energy asset.
Even though it does not capture the potential energy in the food or green waste, it could easily be incorporated in the campus biogas plant in the future, making up for any shortfall in the annual energy supply by photovoltaics.
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