Research carried out confirmed the possibility removal by means of shorter nitrification and denitrification in high ammonia concentration wastewater.During nitrification ammonia nitrogen was oxidized to nitrite nitrogen and further oxidation to nitrate nitrogen was stopped.Build-up of nitrite nitrogen was reduced to free nitrogen during denitrification process where reduction of nitrate nitrogen to nitrite nitrogen was avoided.
Two strains of bacteria isolated from activated sludge were tested for their ability to grow under aerobic, anaerobic and denitrifying condition.The microorganisms stored phosphorus intracellulary as polyphosphates in aerobic and anoxic mileu.Both strains appared to be able to release phosphates anaerobicaly, which was stimulated by acetate.Particularly high P-relaese effect was observed in the case of bacteria which grew under anoxic conditions.
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