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Methane and nitrous oxide, both greenhouse gases, are emitted during wastewater treatment.

Production of recycled paper uses 50% less water than raw material paper production, reducing the amount of methane and nitrous oxide released in the wastewater. Additionally, if paper is recycled it won't end up in landfills where it would then degrade and release methane.Īs it concerns plastic recycling, the Stanford Magazine reports that study after study reveals that recycling surpasses virgin production of plastics on all environmental measurements, especially when it comes to carbon emissions. Estimates vary with the type of recycling process used, but there is consensus that recycling and remanufacturing plastic saves at least 30% of the carbon emissions that original processing and manufacturing produce. That could mean an annual savings of 30 to 150 million tons of CO2. A group of Italian scientists performed an analysis of different recycling methods, as compared to landfilling or combustion. Comparing greenhouse gas emissions from post-consumer plastic recycling with the equivalent amount of virgin plastic production, the researchers quantified emissions savings of 70% to 80% in the recycling scenario. This Metropolitan series on recycling will cover each category of recyclable waste in more depth. This and more information is found on the Barcelona city website: But for now, we’ll lay the basics of what is recyclable and what is not in each of the colored recycling bins: yellow, green blue and brown. Items which can be thrown out: cigarette butts, sanitary towels, diapers, sweeping debris, cotton, hair, used pens and pencils, animal feces and all other non-recyclable trash. Items which cannot be thrown: tea bags, paper towels and paper towel soaked with oil, food leftovers (egg shells, shellfish, etc.), which should be thrown into brown containers. Wood remains, CDs, cartons with toxic materials or clothing should be delivered to a punt verd (green point, a neighborhood recycling center). The grey bin is for all the waste which cannot be recycled. This waste is delivered to ecoparks, where errant recyclable items are separated out into paper/cardboard, packaging, glass and other materials by several procedures in order to integrate them into the recycling chain.

Waste which cannot be recycled is then either delivered to landfills or incinerated. However, the system works only as well as the humans that feed it with trash. Items that are not cleaned before disposal can result in more items going into landfills.

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