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Keep it in the freezer and use it later to make a great home made stock.
Very rich in minerals, particularly in calcium, the shells make excellent fertiliser. Let them dry and then crush them (with a rolling pin for example). With a garden fork, incorporate the powder into the soil at the foot of your plants (even indoor plants).
Use a small coffee grounds container to eliminate odours from your cupboards and your refrigerator.
Wet and dry household waste (except meat scraps, fish and dairy products) can be transformed into compost, a stabilized product, hygienic and rich in humus, and very useful in the garden. You will find the procedure to be followed here.