Special aspects of choosing the methods of single-stage deironing and demanganization of underground waters

Summary

Special aspects of choosing the methods of deironing and demanganization of underground water depending on the physical, chemical and microbiological properties in a single-stage water treatment process are described. The method of removing excessive concentrations of iron and manganese shall be chosen in the process of studies at the pre-project phase of front-end engineering and design. For underground water containing apart from manganese also iron mainly as oxides, the physical and chemical methods that combine pretreatment of raw water with a strong oxidant (sodium hypochlorite, ozone etc.) and subsequent filtration through chemically active material are most acceptable. Biological method of water deironing and demanganization is conditioned by the presence of microbiocenosis with the life cycle associated with the processes of iron and manganese oxidation in the ecosystem of the treatment facilities. The procedures of filter media inoculation with Crenothrix and Siderocapsa – Arthrobacter bacterial cultures are described. Based on the experience of operating «Vostochnyi-2» facilities for underground drainage water deironing and demanganization with a capacity of 25,000 m3/day in Krasnodar the use of the physical and chemical method of water treatment was justified. The results of operating a water treatment plant in «Yuzhnyi» settlement of Barnaul city show the efficiency of the biological method of underground water deironing and demanganization conditioned by the presence of microbiocenosis with the life cycle associated with the processes of iron and manganese oxidation in the ecosystem of the treatment facilities.

Key words

ground water , iron , manganese , iron bacteria , single-stage deironing and demanganation , catalytically active filtering material