One of the biggest strengths of single stream recycling is also its biggest weakness: one bin for everything. The ability to throw all recyclables into one bin that is taken to the curb for pickup and transport by a service is almost as easy and convenient as throwing items in the trash, then rolling the cart to the curb. Unfortunately, throwing all of these items in the same bin, which is then dumped into a truck with items from every other bin on your route leads to increased contamination, and these contaminated items end up in the landfill anyway. Even if your bin contains no contaminants, if the cardboard from your bin ends up beside a contaminated bottle with some oily residue and that oil gets on the box, the box is now also contaminated and cannot be recycled.
So, while curbside recycling programs result in a higher percentage of people recycling, a lack of knowledge – or even willful ignorance – about correct recycling practices has resulted in an increased cost for operating single stream facilities, making the practice of single-stream, curbside recycling ineffective and inefficient, not to mention expensive.
Dual stream recycling is less convenient as this model requires transporting your recyclables to a facility and sorting them into particular bins. However, this method of recycling has been shown to be significantly more effective and result in significantly lower rates of item contamination and therefore fewer intended recyclables becoming trash.
The demand for recycled materials still exists, but this shift in the market has rendered the single stream curbside model ineffective and expensive.