DOI 10.35776/VST.2021.10.03
UDC 628.35:615.076

Dubovik Ol’ga, Markevich R. M., Gavrilovich Ekaterina, Grebenchikova Irina, Ivanovich Vadim

Improving the hydrobiological analysis of activated sludge
at the Minsk wastewater treatment facilities

Summary

Based on the accumulated experience in operating the Minsk Wastewater Treatment Facilities and a review of information sources, a scheme for the hydrobiological analysis of activated sludge was determined, and a form for recording the results of the analysis was provided. For the quantitative account of filamentous microorganisms, an original five-point system was developed. Based on the literature data analysis, favorable conditions for the mass growth of filamentous microorganisms found in activated sludge were determined. Over a long period of time, including different seasons of the year, the improved methodology was tested for monitoring the state of the sludge suspension at two sites of the treatment facilities: traditional four-line continuous-flow aeration tanks at the first site and bioreactors with cascade denitrification at the second site. The species of filamentous microorganisms, permanently living in wastewater treatment structures, have been identified, and the dominant species have been determined. The results of the analysis of filamentous forms and sedimentation characteristics of activated sludge are compared. Conclusions were made about the features of the biocenosis in the aeration tanks at the first site and in the bioreactors at the second site; about the identity of the species composition of the filamentous bacteria communities, the effect of the wastewater composition and treatment conditions (sludge load, occurrence of zones with different levels of aeration) on the properties of the sludge suspension.

Key words

wastewater treatment , sludge index , activated sludge , active sludge dosage , hydrobiological analysis , filamentous form of microorganisms , point-based system

The further text is accessible on a paid subscription.
For authorisation enter the login/password.
Or subscribe

REFERENCES

1. Kozlov M. N., Dorofeev A. G., Aseeva V. G. Mikrobiologicheskii kontrol’ aktivnogo ila bioreaktorov ochistki stochnykh vod ot biogennykh elementov [Microbiological monitoring activated sludge in the bioreactor for removing nutrients from wastewater. Moscow, Nauka Publ., 2012, 79 p.].
2. PND F SB 14.1.77-96 Metodicheskoe rukovodstvo po gidrobiologicheskomu i bakteriologicheskomu kontroliu protsessa biologicheskoi ochistki na sooruzheniiakh s aerotenkami [Methodological guidelines for hydrobiological and bacteriological control of the biological treatment process at the facilities with aeration tanks. Moscow, AKVAROS Publ., 1996, 97 p.].
3. PND F SB 14.1.92-96 Metodicheskoe rukovodstvo po gidrobiologicheskomu i bakteriologicheskomu kontroliu protsessa biologicheskoi ochistki na sooruzheniiakh s aerotenkami [Methodological guidelines for hydrobiological and bacteriological control of the biological treatment process at the facilities with aeration tanks. Moscow, AKVAROS Publ., 1996, 99 p.].
4. Wilen B. M. Effect of different parameters on settling properties of activated sludge. Chalmers University of Technology. Department of Water Supply and Sewerage Technology. Sweden, Rapport, 1995, 64 p.
5. David J., Richard M. G., Daigger G. T. Manual on the causes and control of activated sludge bulking, foaming, and other solids separation problems. 3rd edition. London: CRC Press, 2017, 190 p.
6. WWOA [Electronic resource]: Identification & Control of Filamentous Bacteria: https://www.wwoa.org/files/publishedpapers/2013/Microbiology/Identification%20and%20Control%20of%20Filamentous%20Bacteria.pdf/ (accessed February 20, 2017).
7. Eikelboom D. H. Process control of activated sludge plants by microscopic investigation. London: IWA Publishing, 2000, 170 p.
8. Van Haandel A. C., van der Lubbe J. G. M. Handbook of biological wastewater treatment design and optimisation of activated sludge systems. London: IWA Publishing, Alliance House, 2012, 769 p.
9. RESEARCHGATE [Electronic resource]: Activated sludge bulking one hundred years of theory and practice, Lever M. https://www.researchgate.net/publication/271523654_ACTIVATED_SLUDGE_BULKING_One_hundred_years_of_theory_and_practice– (accessed February 10, 2019).
10. The causes and control of activated sludge bulking and foaming. summary report: Prepared by Dynamac Corporation. Rockville, 1987, 92 p.
11. D’Antoni B. M., Iracà F., Romero M. Filamentous foaming and bulking in activated sludge treatments: causes and mitigation actions. fiesso d’artico, 2017, 10 p.
12. Richards A. Effects of detergent use on water quality in Kathmandu, Nepal: Master of engineering in civil and environmental engineering at the Massachusetts Institute of technology, Cambridge, 2003, 84 p.
13. Övez S., Orhon D. Microbial ecology of bulking and foaming activated sludge treating tannery. Journal of Environmental Science and Health, A40:409–422, 2005, pp. 409–422.
14. Dubovik O. S., Markevich R. M., Antonov K. V. [Improvement of biological removal of nitrogen and phosphorus compounds from wastewater under the conditions of cascade denitrification]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2019, no. 2, pp. 19–23. (In Russian).
15. Grishin B. M., et al. Sovershenstvovanie raboty sooruzhenii biologicheskoi ochistki stochnykh vod s ispol’zovaniem elektrogidrodinamicheskikh ustanovok [Improving the operation of biological wastewater treatment facilities using electrohydrodynamic installations. Penza, PGUAS Publ., 2013, 128 p.].