Biologinio geležies ir mangano šalinimo iš požeminio vandens principai. Technologijos . Jų taikymo Lietuvoje galimybės

Abstract

Lithuania needs to make a scientific study of iron and manganese removal treatment and supply system. "Iron bacteria" are considered to be capable of metabolizing reduced iron and manganese present in their aqueous habitant and of depositing it in the form of hydrated ferric or manganese oxide on or in their mucilaginous secretions [4]. It is possible to establish a biological iron and manganese removal process and this process clearly offers some advantages over chemical precipitation of iron in the groundwater at the France, England. Finland. Germany and elsewhere waterworks [6]. Which of the processes will take place naturally in a water works filter highly depends on the raw-water quality (pH value) and the oxidation process (redox potencial) as shown in figure (3,4) [7]. Because of the differences in the optimum treatment conditions for iron and manganese removal (figure 3). two filtration steps are usually required [5] [6]. Although the different bacterial species have individual requirements on their environment, some conditions are generally valid for optimal bacterial growth, as shown in figure (4). Typical raw water characteristics (Eh. pH) for water from the Lithuanian beds are in the area within which redox - and pH - values iron and manganese bacteria are usually found [figure 4]. It must be concluded that biological iron and manganese removal is an attractive process for the Lithuanian groundwater types.