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UDC 628.237

Fedorov Sviatoslav Viktorovich, Vasilyev V. M., Klementyev M. N.

Study of gas evolution in a sewer section

Summary

Transportation of wastewater through sewer networks is accompanied by the generation and evolution of gases from the flow. For a quantitative assessment of the gas evolution process a sewer section model has been developed in the ANSYS CFX finite element analysis package. The model takes into account the combined flow of wastewater, entrained air and sewage gas (e.g. carbon dioxide) coming from the collector tray. Monitoring was carried out in a section of the domestic sewage system (DN = 500 mm) in the industrial zone of Obukhovo in St. Petersburg. The measured values of the vacuum pressure are in the range of model calculations. The process of designing a computational area of the sewer section and establishing initial and boundary conditions is presented. As a result of modeling the dependences of the carbon dioxide concentration and the pressure of the gas-air environment in the underroof space of the pipeline with different slopes and filling levels were obtained. The results obtained can serve as a basis for the approach to predicting the process of gas evolution in sewer sections.

Key words

monitoring , simulation , ecological safety , sewerage network , carbon dioxide , hydrogen sulfide , methane , ammonia , gas evolution intensity

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REFERENCES

1. Vasil’ev V. M., Malkov A. V., Klement’ev M. N. [Places of corrosive gas generation in the sewerage network]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2017, no. 1, pp. 66–74. (In Russian).
2. Fedorov S. V., Vasil’ev V. M., Teliatnikova A. M. [Designing a principal model of a sewer network]. Vestnik Grazhdanskikh Inzhenerov, 2018, no. 2 (67), pp. 168–174. (In Russian).
3. Wang Y. C., Nobi N., Nguyen T., Vorreiter L. A dynamic ventilation model for gravity sewer networks. Water Science & Technology, 2011, no. 65 (1), pp. 60–68.
4. Fedorov S. V., Teliatnikova A. M. [Asessment of gas evolution intensity in a sewer section]. Proceedings of «Contemporary Problems of Water Supply and Wastewater Disposal» International Scientific-Practical Conference confined to the 130-year anniversary of the department of water use and ecology]. Saint-Petersburg, SPbGASU Publ., 2018, pp. 81–85. (In Russian).
5. Lukinykh A. A., Lukinykh N. A. Tablitsa dlia gidravlicheskogo rascheta kanalizatsionnykh setei b diukerov po formule akademika N. N. Pavlovskogo [Table for hydraulic calculation of networks and syphons from the formula of academician N. N. Pavlovskii. Moscow, Stroiizdat Publ., 1974, 156 p.].
6. Vasil’ev V. M., Pankova G. A., Stolbikhin Iu. V. [Deterioration of sewage tunnels and in-line structures as a result of microbiological corrosion]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2013, no. 9, pp. 67–76. (In Russian).
7. Carrera L. Caractérisation du transfert liquide/gaz du sulfure d’hydrogène dans les réseaux d’assainissement: These de doctorat de l’universite de Lyon. Lyon, Ecole Doctorale de Chimie, 2016, 194 p.
8. Malkov A. V. [Calculation of the volume of gas environment moving in deep laid gravity sewers under the impact of entrain capability of fluid]. Vestnik Grazhdanskikh Inzhenerov, 2017, no. 3 (62), pp. 160–165. (In Russian).
9. Edwini-Bonsu S., Steffler P. M. Air flow in sanitary sewer conduits due to wastewater drag: A computational fluid dynamics approach. Journal of Environmental Engineering Science, 2004, no. 3 (5), pp. 331–342.