Predicting energy-efficient effect of the controlled air delivery
at the Novo-Liuberetskie Wastewater Treatment Facilities

Summary

Стратегия развития АО «Мосводоканал» предусматривает
The corporate strategy of «Mosvodokanal» JSC envisages the systematic practical application of energy-efficient solutions substantiated by the method of mathematical prediction of the energy-efficient effect of the controlled air delivery at the air blower house of Block No. 1 of the Novo-Liuberetskie Wastewater Treatment Facilities in Moscow. The controlled air delivery to the aeration tanks for the biological wastewater treatment processes has been proposed as a key and cost effective method of energy conservation. The energy-efficient effect was determined by comparing the resultant energy consumption of two states of the predictable air deliver system – the basic state without control and controlled one. In the process of data and measurement method generation the calibrated metering devices of the operating SCADA system and data of the certified laboratory were used. The experimental survey of the air blower house with N750-23-6 units was carried out. The average decrease of air delivery resulting from the equipment deterioration for the 35 years’ operating period was 5.8–10.4%; the operation pressure decrease was 40.7–5.4%. The isoentropic coefficient of performance of N750-23-6 units was 75% at 79% rating. The method of predicting the energy-efficient effect including the mathematical model of energy input is considered. The model provided for 1.27% average ratio error at the verification against the actual environment of the operating object. The mathematical prediction of the energy-efficient effect revealed 32.5% or 11,343.97 thousand kWh/year reserve or 30,061.52 thousand ruble/year (VAT excluded) savings. Adjustable blade control of the air blowers was chosen as the technical basis of the energy efficiency. The study results formed the basis for the energy service contract.

Key words

energy efficiency , control arrangements , sewerage treatment facilities , simulation modeling , air-blowing house , rotary blade regulation , energy service contract , energy-efficient effect