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UDC 628.355.2

Nikolaev Yu. A., KAZAKOVA E. A., GRACHEV V. A., Kevbrina M. V., Dorofeev A. G., Aseyeva V. G., Akmentina A. V.

Biological treatment of municipal wastewater and return flows with the use of granulated sludge

Summary

The experience of aerobic granulated activated sludge formation in the laboratory batch reactor by sedimentation selection with the use of flocculant is described. The sludge is used in the process of low concentrated municipal wastewater and sludge dewatering filtrate (centrate) treatment. The developed technologies of granulated sludge formation provide for the intensification of the wastewater treatment processes; and hence the reduction of the treatment facilities footprint is ensured alongside with the improvement of their operation, reliability and efficient performance.

Key words

wastewater , biological treatment , sludge index , granulated activated sludge , phosphate accumulating organisms

DOI 10.35776/MNP.2019.10.06
UDC 628.355

Kevbrina M. V., Akmentina A. V., Dorofeev A. G., Agarev Anton, Aseyeva V. G., KOZLOV M. N., Nikolaev Yu. A.

Advanced technology of municipal wastewater treatment
with granular sludge

Summary

Increasing the specific biochemical capacity of the facilities using the so-called granular activated sludge is one of the promising areas for the development of biological wastewater treatment technologies. Granular sludge is microbial biocenosis specializing in the decomposition and mineralization of substances present in wastewater. The main distinction from regular sludge is due to two important factors: the composition of the basic structural unit of granular sludge – granules, and a high sedimentation rate (up to 20 m/h). This provides for developing sludge doses of up to 10 g/l in bioreactors of wastewater treatment. The results of the development of the first biotechnology in Russia for municipal wastewater treatment of using granular activated sludge are presented. The technology has been implemented at the facilities of Mosvodokanal JSC. The technology of aerobic biological treatment in a sequencing batch reactor with sequential nitri-denitrification and an upward flow of wastewater provides for the quality of effluent that meets the standards for maximum permissible concentrations for discharge into fishery bodies. Technical and economic comparison of the developed technology with the technology of removing nutrients in flow-through aeration tank showed that the life cycle costs of the facilities with partially granulated activated sludge are 1.4 times less than the costs of traditional biological treatment technology (for a capacity of 1000 m³/day).

Key words

biological treatment , granulated activated sludge , municipal wastewater , nutrients removal , SBR-reactor

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