Reconstruction of rapid sand filters at the Velizhany water treatment facilities of Tumen

Summary

The city of Tumen is supplied with drinking water from two water sources – surface and underground. The complex of Metelevskii water intake and treatment facilities with a capacity of 150 thousand m3/day was built in 1981. The Velizhany water treatment facilities with a capacity of 128 thousand m3/day of drinking water were built in 1970-ies. The need for not simply repair but for the reconstruction of the facilities with improving the reliability of the treatment process was stipulated by the growing water deficiency in a rapidly developing city as well as by the lack of capacity reserve. The experience of upgrading rapid filters at the municipal water treatment facilities with the use of advanced drainage-distribution systems is presented. The drainage-distribution systems before and after rapid filters reconstruction are described; their basic parameters are given. The experience of retrofitting Triton drainage system in experimental filter No. 13 of the Velizhany water treatment plant is described. For the comparative evaluation and determination of the rapid filter maximum operational life control back washing of the filter media in filters No. 13 and 4 were carried out. In 2013 pilot tests of possible using Culligan Italiana S.p.A. filter media for removing manganese from the water of the Velizhany intake deep wells were carried out. The upgrade of the Metelevskii water intake rapid filters provided for required capacity of the purification facilities and water quality under the forced working conditions inter alia by means of the right selection and design of the drainage-distribution system. The experience of reconstructing filters at the Tumen water treatment facilities was used in the process of developing the relevant section of the «ROSVODOKANAL» Group technical policy.

Key words

water treatment , rapid filter , drainage-distribution system , aeration , filter layer , control back washing