BIOLOGICAL PURIFICATION OF WATER TO ANY DEGREE UP TO AND DRINKING WATER

An installation and a method for water purification which includes sequentially: A first section (2, 15) where the waters enter the installatio n and where the incoming waters come into contact with living microscopical an d macroscopical organisms in order to achieve the removal from the waters, as sludge, water contents in suspension, whether such contents existed in the incoming waters or whether such contents were produced after the incoming waters entered the works and they came in contact with living organisms. A second section (3, 4, 5) comprising a series of structures like structure (3 ) which are connected so that each one drains its water into a following one, while each structure of the type of structure (3) contains a layer of inert material into which grow suitable plants which utilise for their growth contents within the incoming waters so that such contents are removed from t he flowing waters. The total area of the series of structures like structure (3 ) is determined from the desired degree of purity of the outgoing waters, for a particular quality of incoming water.