While dual stream is an improvement over single stream, I’ll bet the glass, plastic, and metal folks would prefer their items totally segregated. I’ll also bet not one of those industries made an initial request that their materials be mixed with other materials. It’s very important to know the history of single stream. Do you know how single stream’s implementation is similar to that of factory hog farms?
Read Resource Recycling’s article “Dual-stream collection regains appeal in some areas”.