UDC 628.35:665.666.6
DOI 10.35776/VST.2023.08.06

Kevbrina M. V., Gavrilov Dmitrii, Agarev Anton

Methodological approaches to the design of acidifiers for primary sludge to enhance the processes of nitrogen and phosphorus removal from municipal wastewater

Summary

The experience of introducing the process of raw sludge acidification at the Moscow wastewater treatment facilities is summarized. Two types of acidifiers have been operated at the Kuryanovskie and Lyuberetskie Wastewater Treatment Facilities in Moscow: acidifiers-thickeners and acidification reactors (mixers) with subsequent rinsing and thickening in a separate thickener. The main indicator for the acidification process is the solids retention time (SRT, solids retention time). At Moscow wastewater treatment plants, it was 3.5 days, that was the optimal value. Extra formation of BOD₅ (an increase in acidificate-enriched primary water compared to primary water) from 17.8 ± 9.1 to 31 ± 17.5 mg/l and specific BOD₅ formation of 0.1 mg/mg of suspended solids, or 0.15 mg/mg of ashless matter (an increase in acidificate-enriched primary water compared to primary water in specific formation of BOD₅ from 1 mg of suspended or ash-free matter settled in primary settlers and sent to the acidifier) was shown. Formulas are derived for calculating the basic process indicators: hydraulic retention time, retention time as dry matter, the rate of formation of volatile fatty acids. An algorithm of process calculations for designing sludge acidifiers of primary settling tanks in order to enhance the processes of removing nitrogen and phosphorus from municipal wastewater is presented.

Key words

wastewater treatment , acidification , readily available organic matter , prefermentation , process parameters of the acidifiers’ operation , acidifier designing

For citation: Kevbrina M. V., Gavrilov D. V., Agarev A. M. Methodological approaches to the design of acidifiers for primary sludge to enhance the processes of nitrogen and phosphorus removal from municipal wastewater. Vodosnabzhenie i Sanitarnaia Tekhnika, 2023, no. 8, pp. 38–42. DOI: 10.35776/VST.2023.08.06. (In Russian).

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REFERENCES

1. Henze M., Armoes P., LaCour-Jansen I., Arvin E. Ochistka stochnykh vod. Biologicheskie i khimicheskie protsessy [Wastewater treatment. Biological and chemical processes. Moscow, Mir Publ., 2009. 480 p.].
2. Danilovich D. A., Epov A. N. Raschet i tekhnologicheskoe proektirovanie protsessov i sooruzhenii udaleniia azota i fosfora iz gorodskikh stochnykh vod [Calculating and designing processes and facilities for nitrogen and phosphorus removal from municipal wastewater. Moscow, 2020, 225 p.].
3. Ochistka stochnykh vod s ispol’zovaniem tsentralizovannykh sistem vodootvedeniia poselenii, gorodskikh okrugov. Informatsionno-tekhnicheskii spravochnik po nailuchshim dostupnym tekhnologiiam ITS 10-2019 [Wastewater treatment with the use of public wastewater disposal systems of communities, urban districts. Information and technical reference book of the best available technologies ITS-2019. Moscow, Biuro NDT Publ., 416 p.].
4. MÜNCH E. DSP-Prefermenter Technology Book. Science Traveller International Advanced Wastewater Management Centre, Brisbane, Australia, 1998.
5. McMahon K. D., He S., Oehmen A. The microbiology of phosphorus removal. Microbial ecology of activated sludge / Eds. Seviour R., Nielsen P. H. London: IWA, 2010. Chapter 10, рр. 281–319.
6. Kevbrina M. V., Gavrilin A. M., Belov N. A., Aseeva V. G., Gazizova N. G. [Acidification potential of incoming wastewater and raw sludge at the Moscow wastewater treatment facilities]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2012, no. 10, pр. 68–70. (In Russian).
7. Pakhomov A. N., Strel’tsov S. A., Kozlov M. N., Khar’kina O. V., Ershov B. A., Belov N. A. [Experience of operation of facilities of biological wastewater treatment for nitrogen and phosphorus compounds]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2010, no. 10, pр. 35–41. (In Russian).
8. Kozlov M. N., Strel’tsov S. A., Kevbrina M. V., Gavrilin A. M., Gazizova N. G. [Acidification (prefermentation) as a method of raw sludge stabilization in the process of nutrients removal from wastewater]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2013, no. 5, pр. 13–20. (In Russian).
9. Kevbrina M. V., Gavrilin A. M., Kozlov I. M. [The new form of prefermentation (acidification) process arrangement to improve the efficiency of removing nutrients from wastewater]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2014, no. 5, pр. 73–80. (In Russian).
10. Kevbrina M. V., Gavrilov D. V., Belov N. A., Agarev A. M. [Analysis of acidifiers after of the reconstruction of the block of the Liuberetskie Wastewater Treatment Facilities]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2022, no. 6, pр. 25–33. DOI: 10.35776/VST.2022.06.03. (In Russian).
11. Kevbrina M. V., Gavrilov D. V., Belov N. A., Agarev A. M. [Industrial tests at the Kur’ianovskie Wastewater Treatment Facilities involving the transfer of one primary settling tank into the acidification mode]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2023, no. 2, pp. 46–52. DOI: 10.35776/VST.2023.02.06. (In Russian).
12. Rössle W. H., Pretorius W. A. A review of characterisation requirements for in-line prefermenters. Paper 2: Process characterization. Water SA, 2001, v. 27, no. 3, pp. 413–422.
13. Fermenters for biological phosphorus removal carbon augmentation from the nutrient removal challenge. WRF (The Water Research Foundation), 2019.
14. Oskovitaia K. O., Surzhko О. А. [Calculation of the elements of the best available technologies in the reconstruction of the Levoberezhny treatment facilities in Rostov-on-Don]. Electronic Scientific Journal. Inzhenernyi Vestnik Dona, 2017, no. 4. (In Russian).