San Francisco area utility turns food waste into green energy – USATODAY.com
by Andrew on Nov.09, 2009, under bio fuel
The food-scrap project “hasn’t been a cakewalk,” Williams says.
Waste haulers, who pay the utility district to take the waste, collect the food scraps from restaurants and hotels as part of their normal garbage pickups.
Some of the haulers weed out big items, such as cardboard boxes used for produce. Other haulers have restaurants and grocers do more of the separation so that the waste is cleaner.
Upon arrival via truck at the plant, the food scraps look like mounds of wet dirt. They’re dumped into 20,000-gallon underground tanks. There, grinders turn the scraps into a mud-like substance. Bigger items, such as rocks and utensils, fall out.
via San Francisco area utility turns food waste into green energy – USATODAY.com.
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