DOI 10.35776/VST.2022.12.04
UDC 628.35

Stepanov S. V., Avdeenkov Pavel, Ponomarenko Ol’ga, MOROZOVA K. M.

Results of studying biological treatment of wastewater of an egg processing enterprise in a pilot membrane bioreactor

Summary

The results of studies on the biological treatment of wastewater of an enterprise for advanced processing of chicken eggs in a pilot membrane bioreactor (MBR) with preliminary denitrification are presented. It is shown that the key indicator of pollution the treatment facilities shall be calculated on is BOD_total. At loads on the ash-free basis of activated sludge according to BOD_total from 0.06 to 0.125g/(g·day) for raw wastewater and from 0.04 to 0.12g/(g·day) for wastewater after preliminary coagulation and settling, BOD_total of permeate was 8–12 mg/l, and the concentrations of ammonium and nitrite met the MPC for fishery water bodies. The minimum recirculation that provided for the concentration of nitrate nitrogen in the effluent at the MPC level, turned out to be eight-fold for raw wastewater and six-fold for the pre-coagulated one. The inert part of COD was about 90 mg/l. On the basis of the executed studies the kinetic constants of the oxidation of organic substances required for the calculation of industrial biological treatment facilities were determined: ρ´_max for BOD_total – 29.9 and 30.4 mg/(g·h), K_m for BOD_total – 34.7 and 25.2 mg/l for raw wastewater and wastewater after preliminary physical and chemical treatment, respectively. The total volumes of bioreactors with a capacity of 600m³/day, operating with an activated sludge dose of 8 g/l according to the MBR technology with preliminary denitrification, while providing for the treatment level of BOD_tot of 12 mg/l and removing nitrogen compounds to the MPC for fishery water bodies, amounted to 3716 and 1643m³ for raw wastewater and wastewater after preliminary physical and chemical treatment, respectively.

Key words

wastewater , biological treatment , kinetic constants , membrane bioreactor , food industry , egg processing enterprise

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