Which process converts waste materials into the same sort of product from which they came?

• A. Mass Burn
• B. Remediation
• C. Secondary Recycling (Open-Loop Recycling)
• D. Primary Recycling (Closed-Loop Recycling)

Answer: (D)

Converting waste into the same kind of product is closed-loop recycling, also known as primary recycling. This process preserves the material’s identity so it can be reused to make the same type of product again, rather than becoming something different. For example, PET beverage bottles can be recycled into new PET bottles, aluminum cans into new aluminum cans, and glass bottles into new glass bottles. This is different from open-loop or secondary recycling, where the recovered material is used to make a different product (downcycled) and from mass burning, which destroys material by incineration for energy, and from remediation, which is cleanup rather than material reuse. So the best answer is primary (closed-loop) recycling.