Abstract
Abstract The efficiency of nitrification has a great influence on the effect of removing nitrogen from wastewater. Problems with the process are associated with reducing the age of activated sludge, lower temperatures of wastewater in aeration chambers, rapid changes in the amount and composition of wastewater containing toxic substances or inhibiting the oxidation of ammonia nitrogen. The research concerned the possibility of cultivation and storage of the nitrifying bacteria biomass, which could be added to the activated sludge in case of a drop of nitrification efficiency. The study showed that even a four-year-old storage of nitrifying bacteria does not result in their complete destruction.
Highlights
Bacteria oxidizing ammonium nitrogen to nitrate were first described by Winogradsky in 19th century [1]
There are some periods of a drop of biochemical activity of bacteria responsible for nitrification process on biological sewage treatment plants, mainly due to the decreasing temperature of the wastewater
To counteract the breakdown of nitrification process there is a need to complete the biomass in a tank
Summary
Bacteria oxidizing ammonium nitrogen to nitrate were first described by Winogradsky in 19th century [1]. Łomotowski belong to aerobic which do not produce spores They are resistant to harsh and dry conditions and for many years are able to go into a state of suspended animation. They belong to chemolithoautotrophs and their basic feature is to create a colony on the border of two phases, e.g. on the edge of sand or soil grains. There has been a growing interest in cultivation of nitrifying bacteria for biomass production which would increase the rate of nitrification in periods of a drop of biochemical activity mainly due to the decreasing temperature of the treated wastewater [7]. The study aimed at demonstrating the ability of the biomass storage and determining their biochemical activity after a long period of storage
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