Nitrification in the Course of Tertiary Treatment of Treated Wastewater with Floating Media

Summary

For complete oxidation of ammonium nitrogen at a wastewater aftertreatment stage it is proposed to use a bioreactor with floating media containing nitrifying microorganisms. Tests of the technology have been conducted with treated wastewater at the Kurianovskiye treatment facilities using the laboratory bioreactor with floating plastic media (60% by volume). After achievement of stable conditions of the bioreactor’s operation the technology proposed has ensured the reduction of ammonium nitrogen concentration by 4,8 mg/l at the average. Reasons for the reduction of efficiency of the bioreactor’s operation and appearance of nitrite-ions in the treated water when changing the technological conditions are presented.

Key words

nitrogen removal , nitrification , bioreactor , wastewater , floating media

A New Factor of Control of Facilities for Biological Removal of Phosphates from Wastewater

Summary

A new technological indicator making it possible to improve the efficiency and stability of phosphates removal at the facilities of biological treatment of wastewater for biogenic elements – the periodicity of change of phosphates concentration in the end of the anaerobic technological zone – is described. The use of this indicator reflecting the activity of phosphate accumulating bacteria has been assumed as a basis of a new algorithm of control of treatment facilities using the technology of biogenic elements removal and led to improvement of the efficiency of phosphates removal by 1,5–1,7 times.

Key words

biological treatment , aeration tank , efficiency , stability , concentration of phosphates , anaerobic zone , phosphate accumulating bacteria