Evaporation was one alternative when the execution of water treatment process was pondered. However, we had to give up on this alternative due to its impracticality and the considerable amount of energy needed for it. The annual average temperature in Hannukainen area is low and the winters are long, which increases the amount of energy needed for evaporation. The quantity of mining waste water in Hannukainen operations varies. There are millions of cubic meters of water to dispose annually, so evaporating this much water would consume a lot of energy.