Here are a couple of points to take into account if you want to compost orange peels, or more generally citrus fruits:
- The chemicals with which citrus fruits are treated is called d-limonene. This chemical is not eaten by all bacteria, but by some and therefore the decomposition process happens slower than with other vegetables or fruits. 
- It is advised to not place citrus fruits and onions inside compost because of their acidic nature. The acid can kill worms and other microogranisms, which can slow down the composition of your pile. You can counter this by adding e.g. hydrated white lime to neutralize the acidity.
- if your oranges are moldly take extra precautions as they can be affected by diseases which can then be passed on through the compost back into your garden.
- generally speaking, oranges and their peels make good compost material when you incorporate them correctly. They introduce nitrogen, potassium, and phosphorus into your compost heap.
- the peels should be chopped into small pieces, to expose as much surface area as possible to bacteria to help speedup the decomposition process.
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