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Why is Vodokanal proud of its system of water quality biomonitoring? Who helps the staff?

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Vodokanal is proud of its unique system of water quality biomonitoring – diagnostics of the functional status of crayfish and fish. The method developed by the Russian Academy of Sciences’ Environmental Safety Research Institute consists in measuring the local crayfish cardiorythm and analysing the behavior of fish. If the water from the Neva contains toxic substances, the heart rate of crayfish increases, and the behavior of fish changes significantly. Now, the biomonitoring system is used at all waterworks in the city. The “staff” of the Main Waterworks includes 12 crayfish. Their working schedule: two days in the aquarium under supervision, then four days of rest and active eating. Vodokanal employs male crawfish only.

VII. Watch the video № 1 from Video archive (page 58) and try to speak about the innovative system of water supply in St. Petersburg.

VIII. Watch the video № 4 from Video archive (page 58). After watching video try to speak on the question of water quality biomonitoring in St. Petersburg.

IX. Read the text “Sewerage system of St. Petersburg” and find out what new method of wastewater treatment has been used and how the problem of wastewater sludge utilization is solved in this town.


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