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UDC 628.356

Berezin S. E.

Choosing the method of air blower control for wastewater aeration

Summary

The following methods of aeration airflow control by air blowers at the wastewater treatment facilities are considered: throttling with a baffler upstream the inlet fitting of the air blower; varying the shaft speed with the variable frequency electric drive; changing the angle of airflow attack with turning vanes inside the blower upstream and downstream of the impeller.

Key words

wastewater aeration , blower installation , airflow control , power efficiency

UDC 620.92:697.3:621.577
DOI 10.35776/VST.2024.10.03

Khabirov Iulai, Solov’ev Ruslan, Khamidullin Il’dar

Estimation of the possible use of wastewater thermal energy
for the auxiliaries of the treatment facilities

Summary

Through the example of the wastewater treatment facilities of Mayachnyi village in the urban district of Kumertau (Republic of Bashkortostan), the possibility of using the thermal energy of effluent to heat incoming wastewater in order to enhance the biological treatment process, as well as for heating buildings, is studied. A heat recovery scheme with the transfer of thermal energy for heating wastewater in a surge tank using a surface heater «jacket» mounted inside the tank of the pipe register or in a heat exchanger «pipe-in-pipe» installed downstream the tank is considered. The required heat output of the heat pump unit has been determined, and the design parameters of various heat exchange units have been calculated. The technical limitations that complicate using a «pipe-in-pipe» heat exchanger and pipe registers have been identified. The possibility of heating incoming wastewater to 18–25 °C has been demonstrated.

Key words

wastewater , ecology , heat pump , power efficiency , resource conservation , secondary thermal energy , recovery

UDC 620.92:697.3:621.577
DOI 10.35776/VST.2025.11.01

Khabirov Iulai, Gataullina Alina, Solov’ev Ruslan, Vazhdaev Konstantine

Feasibility study of using thermal power of wastewater
for improving the efficiency of wastewater treatment facilities operation

Summary

A cost effectiveness analysis of using a system for recovering the thermal power of effluent for heating incoming wastewater to enhance the biological treatment process, as well as for heating the premises of wastewater treatment facilities was conducted. With account of the energy cost in the Republic of Bashkortostan, the operating and capital costs of the proposed method for arranging the heating of wastewater treatment facilities with two alternative options: using gaseous fuel (a block-type gas boiler house) and electric heating devices were estimated. The pay-back period was determined using the overhead cost equivalence method for the proposed design options. The energy efficiency was calculated based on the annual fuel and energy consumption expressed in tons of fuel equivalent. It was shown that the wastewater heating system using a heat pump requires the lowest operating costs (RUB 6.9 to heat 1 m³ of wastewater by 10°C, or RUB 1.3 million per year). The system is also the most energy- and cost-effective since it consumes the minimum fuel equivalent and provides for reducing the cost of expensive primary energy resources by 127 tons of fuel equivalent per year.

Key words

sewerage treatment facilities , heat pump , power efficiency , secondary thermal energy , recovery , pay-back period

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UDC 628.112.24:621.65

Fisenko V. N.

Energy efficiency of pumps in water supply and wastewater disposal systems

Summary

The aspects of anti-terrorism security of water supply and wastewater disposal facilities are considered alongside with the dyna­mics and structure of the Russian domestic market of pumping equipment for water supply and wastewater disposal systems. Current world trends in improving pumping equipment in relation to furnishing with the systems of intelligent management and control and improving energy efficiency within the frames of «Internet of things» (IoT) concept cause problems in interdisciplinarity. The Soviet experience in improving the domestic approach to the assessment of the energy efficiency of pumping systems in the process of ISO/ASME 14414 standard revision is considered. The criteria of the energy efficiency of pumps for water supply and wastewater disposal systems are presented; their advantages and continuity of the similar international practice are shown. In order to determine what pumps manufactured in the Russian Federation and imported to RF are energy efficient in relation to the operation requirements for water supply and wastewater disposal systems it is necessary to define on the basis of the currently available best practice a common approach to the assessment of energy efficiency that can be used by both manufacturers, designers and users of pumping equipment, and by public oversight and monitoring authorities. Pumping equipment that does not meet such requirements must be excluded from the official stream of commerce in water supply as not compliant with the current ecological requirements and put on the restriction list in RF. The problems of interdisciplinarity in relation to the assigned use in safety critical industries of the domestic radioelectronic element base, domestic operating systems, software in instruments and systems of monitoring and control of pumping equipment of water supply and wastewater disposal systems warrant solutions. Allocation of public funds for equipment integrated with data processing centers located overseas must be limited.

Key words

water supply system , water disposal system , power efficiency , centrifugal multi-stage pump , pump load profile , energy efficiency index , «Internet of things»