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UDC 628.33

Kuriatnikov E. A., El' A. M.

Unique design of settling tank covers  at the Moscow wastewater treatment facilities

Summary

The problem of eliminating malodors emitted from wastewater is well known in world practice and is solved by isola­ting open surfaces at the treatment facilities from the ambient atmosphere with covers. The international experience of designing the covers for settling tanks to eliminate malodors is described. The specific features of different cover designs (domed, flat, floating), their advantages and drawbacks are considered. The design of PBI floating cover and the experience of using it on a 54 m diameter primary settler at the Liuberetskie Wastewater Treatment Facilities in Moscow are described. Floating cover for a sludge scraper basin has an original design developed by the «Moselektro» engineers which has nothing comparable in the international practice. The main advantage of PBI cover is the possibility of repairing the equipment installed inside the settling tank eliminating complete cover dismantling. PBI cover has the minimum ventilation space that provides for the significant savings because of the low power consumption of the air cleaning system. PBI covers of any diameter can be installed on the storage tanks at the treatment facilities without any modifications of the building part. The results of the process and durability tests of the sludge scraper of new design that ensures the maximum stiffness and integrity of the system are presented.

Key words

sludge scraper , sewerage treatment facilities , primary settler , domed covering , floating cover , flat cover

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REFERENCES

1. Pakhomov A. N., Strel’tsov S. A., Belov N. A., Mukhin V. A., Kuriatnikov A. A. [Upgrading primary settler]. Vodosnabzhenie i Sanitarnaia Tekhnika, 2011, no. 10, pp. 68–72. (In Russian).
2. http://www.gdc.govt.nz/geodesic-dome-roof-now-in-place (accessed July 29, 2014).
3. http://www.hahlbrock.de/fvk/en/projekte/forschungsanlagen/klaerbeckenabdeckung.php (accessed July 29, 2014).