The experience of using variable speed drives at the facilities
of «Vodokanal» LLC

Summary

The experience of using variable speed drives at the pumping stations operated by Vodokanal LLC in Novokuznetsk is presented. The advantages and disadvantages of this technical device are specified. It is demonstrated that currently, the use of variable speed drives provides for reducing the energy consumption by more than 20%, reducing the repair and maintenance costs; for improving the service life of electric motors; for reducing inrush current, water leaks and the load on the pumping equipment and pipeline valving. The use of variable speed drives has paid off even in case where adjusting the parameters to ensure the technology (velocity, performance, etc.); bringing the equipment parameters to the required values without replacing it (in order to increase the equipment load to the nominal value for the subsequent period); compensating for daily irregularities in water consumption are required.

Key words

frequency converter , pumping station , frequency-regulated electric drive , improving energy efficiency , reducing the expenditures

Modern solutions for the accumulation and purification of rainfall and snow-melt water

Summary

Developed in 1960–1980s process flow schemes for the purification of rainfall and snow-melt waters are not always effective nowadays. At the treatment facilities of airports, housing and public utilities, railway transport, etc., the company successfully applies advanced wastewater treatment technology using equipment of its own production. Instead of the traditional scheme, the treatment facilities use the method of dynamic separation of wastewater, i. e., the simultaneous separation of oil products and suspended solids.

Key words

settling , treatment facilities , oil products , sludge , improving energy efficiency , rainfall and snow-melt waters , dynamic separation