BIOLOGICAL FILTER FOR REMOVING HYDROGEN SULPHIDE, AMMONIA, IRON AND MANGANESE FROM DRINKABLE WATER WITH NO USE OF MECHANICAL AERATION

摘要

Subject: biological filter used for the simultaneous or separate or combined removal of hydrogen sulphide, ammonia, iron and manganese from drinkable water. Operation process: the filling material of the filter consists of silicon gravel while the filter is vaccinated with indigent water bacterial population. The dimensions of the filter and the height of the filling material are defined by the volumetric supply and the concentration of the water pollutants. Aeration is obtained in a natural manner by the water fall and the temperature difference existing between water being under treatment and ambient air. Oxidation of pollutants is realized either by natural oxidation of mainly by use of adequate micro-organisms able to catalyse distinct reactions. The co-existence of microorganisms demands adequate calculations and operational conditions. Advantage: complete removal of pollutants with no addition of chemicals; very low fixed recurrent cost and nul operational cost.