MM, I'm taking your advice and starting a new thread on recycling. Here you'll find the requirements for recycling (separating) the trash and what to do with those odd items such as electronics and hazardous waste such as paint and batteries. There are several centers around the comunidad de Madrid so if one is willing to make the trip, you can be assured your goods are disposed of properly.

http://www.madrid.org/comun/inforjoven/0,4652,195895601_195896950_195897661_12318901_,00.html