For the capsule shell, because it is made of aluminum, aluminum is an infinitely recyclable material.
Capsule coffee generally uses an aluminum casing. Aluminum is the most protective material at present. It can not only lock the aroma of coffee, but also is light in weight and high in strength. At the same time, aluminum protects the coffee from foreign substances such as oxygen, moisture and light. For coffee grounds, you can leave them untreated, but dry them and recycle them with the capsule shell; I usually use them as fertilizer for flowers.
What to do with recycled coffee capsules?