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Parameters of the biotechnology of wastewater treatment for nitrogen and phosphorus removal using immobilized microorganisms are investigated. The acutest problem of municipal wastewater treatment is the low removal efficiency of biogenic compounds, namely nitrogen and phosphorus. Exceeding the discharge norms for nitrogen and phosphorus compounds leads to a dangerous ecological situation in water bodies of Ukraine. The intensity of transformation of nitrogen and phosphorus compounds is limited by the rather low growth rates of nitrifying bacteria (0.25–0.35 day -1 ), sensitivity to pH fluctuations (the value of 6.5–8 should be maintained), competitive relations with heterotrophs. It is advisable to use immobilized microorganisms to increase the concentration of nitrifying bacteria and create favorable conditions for biomass development. The perpendicular air flow in relation to wastewater flow in the aerobic bioreactor zone, which provides the oxidation capacity by ammonium nitrogen of up to 120–130 g/(m 3 ∙day), is investigated. It is established that the specific oxidation rate of organic matter in municipal wastewater treatment reaches 25 mg COD/(g/day), providing COD treatment efficiency of up to 90 %. The efficiency of wastewater treatment for ammonium nitrogen removal at an initial concentration of 30–50 mg/dm 3 is 97.3–99 %. The sequence of anaerobic-anoxic-anaerobic-aerobic processes, which provides the efficiency of wastewater treatment for removal of organic pollutants of 90–95 %, ammonium nitrogen 97–99 % and phosphates 93–95 %. with the treatment duration of up to 4 hours is studied.

Processes of biological wastewater treatment for nitrogen, phosphorus removal by immobilized microorganisms