Process for removing iron and / or a heavy metal, nitrate and fluoride from acidic solutions

摘要

The invention concerns a method of treating an acid solution containing iron and/or a heavy metal and a nitrate. The method comprises the following steps: the addition to the solution of a substance acting as a carbon and energy source; the addition of a sulphate to the solution; and the addition of bacteria which can adsorb cations and/or anions occurring in the solution. In this way, waste water, in particular acid pickling waste, can be purified in a simple and environmentally friendly manner.