DOI 10.35776/VST.2021.04.03
UDC 628.35:661.5

Pukemo M. M., Koulakov A. A., Zheltukhin Roman

Features of hospital wastewater treatment

Summary

At high concentrations of nitrogen compounds and low concentrations of organic substances in wastewater, the process of denitrification does not proceed in full, resulting in a high concentration of nitrates in the effluent. The experience of using an extra substrate to supply the denitrified nitrate nitrogen with the required organic matter is described. Deep suppression of biocenosis at high concentrations of chlorine derivatives in raw wastewater was revealed. At a total chlorine concentration of 5.4–6.8 mg/l, neither biological treatment processes proceeded, nor a biofilm formed on the media surface. It is noted that the composition of the hospital wastewater is characterized by a low concentration of organic matter (BOD5 was on average 42.3 mg/l, COD – on average 128.9 mg/l) with a total nitrogen concentration of 43.4 mg/l. The effectiveness of using sucrose as a substrate for the denitrification of hospital wastewater has been experimentally confirmed. The sugar consumption was 0.17 kg/m³ at the ratio of BOD5/total nitrogen of 0.95 in the incoming wastewater.

Key words

treatment facilities , denitrification , hospital wastewater , extra substrate , sucrose

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

REFERENCES

1. Zhmur N. S. Tehnologicheskie i biokhimicheskie protsessy ochistki stochnykh vod na sooruzheniiakh s aerotenkami [Technological and biochemical processes of wastewater treatment at the facilities with aeration tanks. Moscow, AKVAROS Publ., 2003, 512 p.].
2. Shvetsov V. N., Morozova K. M., Stepanov S. V. [Designing facilities for municipal and industrial wastewater biological treatment in aeration tanks with nutrients removal]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2018, no. 9, pp. 26–39. (In Russian).
3. Henze M., Harremoes P., La Cour Jansen J., Arvin E. Ochistka stochnykh vod [Wastewater treatment. Translated from English. Moscow, Mir Publ., 2009, 480p.].
4. Danilovich D. A., Epov A. N. Raschet i tekhnologicheskoe proektirovanie protsessov i sooruzhenii udaleniia azota i fosfora iz gorodskikh stochnykh vod [Calculation and technologic design of the processes and facilities for removing nitrogen and phosphorus from municipal wastewater. Moscow, 2020, 225 p.].
5. Zhmur N. S. [Analysis of the causes of filamentous bulking and foaming of activated sludge and methods of suppression. Part 1]. Vodosnabzhenie i Kanalizatsiia, 2011, no. 1–2, pp. 94–106. (In Russian).