Abstract
The influence of fluorine on municipal sewage biological treatment The authors examined the influence of fluorine as a factor disrupting the processes of municipal sewage biological treatment. Sodium fluoride was introduced to a municipal plant sewage treated in an oxygen zone, acting as a simulator of uncontrolled industrial sewage discharge. The influence of fluoride ion concentration and the duration of sewage treatment on its biological purification processes were examined. Also, the dependencies of the direction of changes in inorganic nitrogen connections, phosphorus concentration, COD and fluorine on the initial fluorine compound content in the purified sewage were determined. Research samples of the municipal sewage were drawn at the opening of the oxygen zone in a typical municipal sewage treatment plant (RLM > 100 000) employing intensified biogenic substance removal.
Highlights
At present, the main globally used sewage treatment method is the activated sludge method
Biological sewage treatment has been performed for a long time and is conducted in numerous ways – depending on the construction of bioreactors, regional and climatic conditionings, etc. – still, there are general aspects constituting the subject of the research[1]
The fundamental problems of biological treatment embrace uncontrolled industrial sewage discharges, carrying elements and compounds lethal to bacteria used at sewage treatment plants[2]
Summary
The main globally used sewage treatment method is the activated sludge method. Applying the biochemical and partly physical processes to sewage treatment makes it possible to obtain the lowering of the organic substance load in the sewage They are usually used as a consecutive stage of treatment in the case the previously used methods have failed to ensure the appropriate quality of water discharged into the tanks. Biological purification proceeds both under oxygen and hypoxic as well as the anaerobic conditions, and consists in the oxidization and mineralization of organic compounds contained in the sewage with the participation of micro – and macro – organisms. The purification principle is the same as in the case of natural self-purification of water bodies
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