Recommendations on calculation while designing primary sludge acidifiers in order to enhance the processes of nitrogen and phosphorus removal from municipal wastewater

Summary

Recommendations together with calculation formulas for designing acidifiers of primary sludge in order to enhance biological removal of nitrogen and phosphorus compounds from municipal wastewater are presented. An example of calculations using the suggested formulas for the acidifiers at the Kur’ianovskie Wastewater Treatment Facilities in Moscow is given. The analysis of the acidifiers’ operation at the Moscow Wastewater Treatment Facilities testifies that under real conditions the main indicators such as solids (dry matter) retention time SRT, specific formation of BOD5 from ash-free sludge matter, and recycling of acidified sludge, correspond to the values calculated by the suggested formulas. The operational data validate the methodological approaches and calculation tools used in acidification plant design. The calculation formulas have been incorporated into the draft standard for calculating wastewater treatment facilities.

Key words

wastewater treatment , designing , acidification , readily available organic matter , prefermentation , acidoficator

Reconstruction of the Novo-Kur’ianovo wastewater treatment facilities

Summary

The Kur’ianovo wastewater treatment facilities are the European biggest municipal wastewater treatment complex. Being an advanced project for its time (1970-ies) by the XXI century the Kur’ianovo wastewater treatment facilities turned to be obsolescent and needed upgrading. In 2010 the project of upgrading the first and second blocks of the Novo-Kur’ianovo wastewater treatment facilities was launched. The specific features of the design solutions of recovering the capacity of the engineering structures of buildings and facilities of the wastewater treatment plant, of retrofitting nutrients removal process are considered alongside with the aspects of reducing malodorous emissions from the open surfaces of the facilities. Special attention in the project is paid to the selection of process equipment – advanced sludge scrapers, sludge pumps, turboblowers and aeration systems were installed. For the first time floating covers of the primary settling tanks were applied.

Key words

sedimentation tank , aeration , wastewater treatment , sludge disposal truck , sludge scraper , nitrification-denitrification , dephosphatization , aeration tank , acidoficator , malodorous emissions removal , floating cover