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

Upgrading primary settler

Summary

Upgrading 54 m diameter primary settler at the Kouryanovo wastewater treatment facilities in Moscow with the installation of a newly designed IL-54 sludge scraper is discussed. The specifications and advantages of the new design of the sludge scraper are described. Industrial tests of the sludge scraper complete with a floating covering section on the primary settler at the Novo-Kouryanovo wastewater treatment facilities showed high process efficiency and operating reliability. As part of the integrated program of the Novo-Kouryanovo wastewater treatment facilities upgrade it was decided to equip all the 54 m diameter settlers with IL-54 sludge scrapers and floating coverings.

Key words

treatment facilities , sludge scraper , primary settler , scraper system , domed covering