Question: query regarding chemicals used to decomposing the dry leaves. 
Answer: use dry cow dung to decomposing the leaves. mix 1 kg of dry cowdung in 5 liters of water and sprinkles over the waste products at 3 days interval. before sprinkling turn over the waste materials and then sprinkle. when you noticed,  the waste materials turn brown or black then stop the sprinkling of cowdung over it.