UDC 621.929
DOI 10.35776/VST.2023.07.06

Grigor’eva Anastasiia

Study of the optimal mode of sludge agitation in the receiving tank of a wastewater pumping station

Summary

Sludge agitation in the receiving tank of a wastewater pumping station is a rather serious problem due to the high risks of the pumping equipment failure, sludge caking and decay inside the tank. As a rule, sludge settling control methods provide for emptying only the area close to the suction nozzles of the pumps. In the rest of the tank, the caked sludge is periodically washed out by hand during maintenance or minimum filling. A comparison is made between two methods of sludge agitation in the receiving tank of a wastewater pumping station. In the first case, sludge is agitated hydraulically, i. e., using pipelines located along the perimeter of the tank. In the second, conical mixers of improved geometry are used, that is, sludge is agitated mechanically. A comparison of mixing efficiency was made using CFD-modeling. According to the results of modeling the hydrodynamics of mixing, during the operation of conical mixers, no stagnant zones is actually formed in the near-bottom mixing area.

Key words

treatment facilities , pumping station , mathematic modelling , conical mixers , sludge agitation

For citation: Grigor’eva A. N. Study of the optimal mode of sludge agitation in the receiving tank of a wastewater pumping station. Vodosnabzhenie i Sanitarnaia Tekhnika, 2023, no. 7, pp. 53–59. DOI: 10.35776/VST.2023.07.06. (In Russian).

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

Список цитируемой литературы

1. Pshenko L. N. [Upgrade of the operating wastewater pumping stations: practical experience]. Nailuchshchie Dostupnye Tekhnologii Vodosnabzheniia i Vodootvedeniia, 2015, no. 3–4, pp. 42–46. (In Russian).
2. Nikolaev V. G. [The effect of pump characteristics on the energy consumption of wastewater pumping stations and effluent quality]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2009, no. 10, part 2, pp. 3–10. (In Russian).
3. Ignatchik V. S., Konovalov V. B., Vinokurov P. V. [Methods for commissioning of devices for damping surges at wastewater pumping stations]. Voennyi Inzhener, 2021, no. 2 (20), pp. 30–37. In Russian).
4. Khurramova N. U. [Current methods of cleaning emission of a wastewater pumping station]. Nauka. Innovatsii. Obrazovanie, 2022, no. 70, pp. 56–59. (In Russian).
5. Kriukov O. V. [Electrical equipment and automation of a group of wastewater pumping stations]. Avtomatizatsiia v promyshlennosti, 2011, no. 12, pp. 31–34. (In Russian).
6. Vishniakov V. N. [The use of automated control of wastewater pumping stations as a means of increasing the reliability of their operation]. Nauka XXI Veka, 2019, no. 6, pp. 1–10. (In Russian).
7. Dziubo V. V., Alferova L. I. [On the of reconstruction of wastewater treatment facilities in Kedrovyi town in the Tomsk region]. Vestnik Tomskogo Gosudarstvennogo Arkhitekturno-Stroitel’nogo Universiteta, 2010, no. 2 (21), pp. 188–198. (In Russian).
8. Urishev B., Kuvatov U., Artikbekova F., Kuvatov D. Trajectory of sediment deposition at the bottom of water intake structures of pumping stations. Materials Science and Engineering, 2021, no. 1030, pр. 1–9.
9. Abiev R. Sh. [Pat. 2683078, RF. IPC B01F7/18 B01F7/26. Agitation device. Izobreteniia. Poleznye Modeli, 2018, no. 60]. (In Russian).
10. Fedorov S. V., Stolbikhin Iu. V., Shabalin V. V. [Prevention of sludge settling at a stormwater pumping station]. Promyshlennoe i Grazhdanskoe Stroitel’stvo, 2022, no. 5, pp. 72–78. (In Russian).
11. Lin F. Y., Shao S. EKATO Handbook of mixing technology. Schopfheim, 1991, v. 143, pp. 231–240.
12. Braginskii L. N., Begachev V. I., Barabash V. M. Peremeshivanie v zhidkikh sredakh [Mixing in liquid media. Leningrad, Khimiia Publ., 1984, 336 p.].
13. Edward L. Paul, Victor A. Atiemo-Obeng, Suzanne M. Kresta. Handbook of industrial mixing: science and practice. Canada: A John Wiley & Sons, 2004, 1432 p.
14. Zwietering Т. N. Suspending of solid partiicles in liquid by agitators. Chemical Engineering Science, 1958, no. 3–4, pp. 244–253.
15. Ayranci In., Kresta S. M. Critical analysis of Zwietering correlation for solids suspension in stirred tanks. Chemical Engineering Research and Design, 2014, no. 92, pp. 413–422.