The effect of the large-scale introduction of water meters in residential properties

Summary

The analysis of the effect of installing domestic and residential water meters on the water consumption is presented. A graphical chart is recommended for planning the water sales volume under the conditions of large-scale installation of residential water meters.

Key words

water consumption , domestic and residential water meter , planning the amount of water sales

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UDC 628.349.087.4:621.357

Pavlov D. V., Kolesnikov V. A.

Electroplating industry wastewater treatment: advanced solutions

Summary

An innovative technology of electroplating industry wastewater treatment on the basis of electroflotation and ultrafiltration combination has been developed. From technical and economic point of view this technology provides for removing heavy metals from wastewater to 0.01 mg/l, SS and oil products to 0.05 mg/l at relatively low wastewater treatment facilities operational expenditures. The electroflotation plant and unltrafiltration unit on the basis of tubular ceramic membranes are recommended for introduction at the industrial wastewater treatment facilities that are either subject to upgrade or under construction. The main task of the technology and equipment designers is the reduction of the treatment facilities construction and operation expenses while maintaining the high quality of treatment.

Key words

wastewater treatment , ultrafiltration , heavy metals , ceramic membrane , electroflotation

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UDC 628.311

Yegorov N. L., Loitzker Oskar

The effect of shortening the feed section of Venturi flume on the error of measuring the liquid flow rate

Summary

The use of flow meters with Venturi flumes for measuring the flow rate of effluent before discharge into the water reservoir or of wastewater transported to the treatment facilities is reported. The new construction projects boost the flow of wastewater; the level of the upstream water rises, the relative length of the feed section expressed in upstream maximum depth units decreases and does not meet the regulatory requirements any longer. When the similar situation occurs in the throat of the pressure flumes the flow meters are admitted to service however with a higher effluent coefficient error. The procedure of estimating a complementary error at the reduction of the relative feed section length in case of measuring the liquid flow rate with Venturi flumes is suggested.

Key words

measurement error , wastewater , flow rate measurement , Venturi flume , throat

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UDC