I've since learned that about 86% of all trash is recycled here in Cairo. I've seen some of the trucks going down the highway piled even higher than the one in this photo. The Coptic (i.e., Christian) community here handles most of the recycling. They are called the Zabaleen.
Here is a newspaper article that tells more about Cairo's recycling program:
PBS made movie about Cairo's recycling, see details here:
I was curious to see what happens with all the recycled materials coming from Cairo's more than 17 million people so did a little research online. Ramadan latterns and 'church mats' were a couple of the things I saw mentioned. We have a woven mat in our bathroom that I think was also made from recycled material. I bought it from a man on the side of the road for about 15 Egyptian pounds (about $2.75).