Mick: Composting in Mexico and San Francisco

I look forward to seeing everyone's first investigations and questions. Please put your name on your post, so we know who asked what.

I know that in Mexico City, not too long ago people were required to separate their organic and inorganic trash. I also know that oftentimes, when the trash gets thrown into a collection truck, the collectors often mix up the two types of trash.

Is there a functioning large scale composting dump area in Mexico City? Have they been able to extract biogas from it? 

According to Emilio Godoy's 2009 article in IPS: 

"The biogas emanating from the garbage that has built up over the past five years in Mexico could generate 80 MW of electricity, and another 16 MW could be produced annually from the new garbage, according to the National Autonomous University of Mexico's Institute of Electric Research (IIE). "

from http://ipsnews.net/news.asp?idnews=48578

Does San Francisco have a biogas collection system? Is the compost buried, placed in sections, or processed in some way?

-I found that San Francisco takes all food scraps to the Jepson-Prairie composting facility in Vacaville, pictured above.

see link:   http://www.life.com/image/86093789

So far I see nothing about extracting biogas from San Francisco food scraps.

-Mick Lorusso