DOI 10.35776/VST.2021.11.06
UDC 628.168:628.166-926.214

Seliukov Aleksandr, Semenov Mikhail, Baikova Ida

In-process tests of river water conditioning for domestic and drinking water supply in the city of Kurgan

Summary

The experience of using ozonation of river water on a laboratory and pilot scale is considered. The water of the Tobol River is hard and mineralized with an average color value of 24 degrees, a manganese concentration in the winter period of more than 0.8 mg/dm³. After determining the operational doses of the chemicals (polyaluminum chloride coagulant, Praestol 650TR flocculant), test ozonation was carried out followed by the chemical treatment in a laboratory flocculator. To achieve the standard for manganese concentration in river water of 0.1 mg/dm³, high doses of ozone were required – from 35 mg/dm3. Alkalinization of the initial water to pH 9 provided for reducing the ozone dose to 23 mg/dm³. A decrease in color to 15 degrees occurred at ozone doses of 6–7 mg/dm³. River water purification at a pilot plant with a capacity of 50 l/h was carried out according to the complete process flow scheme (ozonation, treatment with coagulant and flocculant, sedimentation, filtration in a sand filter, filtration in a carbon filter, desalination-softening by reverse osmosis). The coagulant dose was 5 mg/dm³, and that of the flocculant – 0.3 mg/dm³. In the steady run of the pilot plant at an ozone dose of 25 mg/dm³, the following quality indicators of the sand filter filtrate were achieved: color 5–7 degrees; manganese 0.05–0.15 mg/dm³; total iron 0.02–0.03 mg/dm³; aluminum 0.05–0.08 mg/dm³; permanganate index 3–4 mg/dm³. Based on the estimate indicators of the Tobol River water composition related to the manganese concentration in water of 0.8 mg/dm³, the theoretic dose of ozone is ≈ 8 mg/dm³, the design dose of ozone can be assumed as 10 mg/dm³ (g/m³).

Key words

ozonization , water supply , chromaticity , manganese , river water

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