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UDC 628.356
Kharkina O. V.
Problems of designing biological treatment facilities with nitrogen and phosphorus removal
Summary
Ensuring the quality of effluent to the level of the most stringent regulatory requirements including the maximum permissible concentrations for fishery water bodies is the responsibility not only of engineering companies providing for professionally executed design solutions but also of the customers responsible for correctly compiled technical tasks, professional choice of effective technical and commercial proposals, competent operation of wastewater treatment facilities. The experience of operating wastewater treatment plants using nitrogen and phosphorus removal technologies makes it possible to assert that in this case a professional approach to the selection of contractors and operation on the part of the customers and to the design on the part of the contractors ensures the required quality of effluent. The problems arising at the design stage of wastewater treatment facilities and the choice of technical and commercial proposals are considered. Recommendations for their solution are given. The article is intended both for the process engineers of engineering companies and for the customers of projects who find it difficult to correctly choose the most effective design solution from a large number of proposed technical and commercial proposals.
Key words
wastewater , biological treatment , sewerage treatment facilities , nitrogen and phosphorus , design and calculation of nutrient removal facilities
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DOI 10.35776/MNP.2020.03.06
UDC 628.358
Strelkov A. K., Egorova Yu. A., Stepanov S. V., Levin D. I., Doubman I. S., Nikolaev Aleksei
Project for the reconstruction of the tertiary treatment plant
at the wastewater treatment facilities of the city of Samara
Summary
Design solutions implemented by «Samarskie Kommunal’nye Sistemy» LLC on the reconstruction of the tertiary treatment plant of the Samara wastewater treatment facilities were considered and analyzed. The project provides for the chemical removal of phosphorus in addition to biological dephosphotation and filtration of effluents after biological treatment. The chemical phosphorus removal unit has been constructed as a building with a packaged plant inside for the preparation and dosing of aluminum sulfate solution; this layout provides for reducing the heating and ventilation costs of the chemical treatment facilities. The chemical agent is added at twelve points in the sludge mixture flow at the outlet of each aeration tank. The calculated concentration of phosphorus as phosphate in the effluent is 0.2 mg/l; the annual consumption of marketable coagulant is 1545 tons; the purchase unit cost is 0.15 rubles/m3. Tertiary treatment by filtration has been ensured by the reconstruction of eight circular settling tanks with a diameter of 54 m into settler-filters with floating media. Herewith, no construction of new buildings and utilities is required. The calculated concentration of suspended solids in the effluent is 4 mg/l, BODfull – 3 mg l. The specific energy consumption for the operation of filters with floating media is
0.57 Wh/m3, the cost of electricity – 0.0022 rubles/m3.
Key words
wastewater , sewerage treatment facilities , aftertreatment , chemical phosphorus removal , filter with floating media
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DOI 10.35776/MNP.2019.10.08
UDC 628.356.1:621.61
Iadrishchenskii A. N., Filippova N. N., Bulygin K. A., Kolobova G. I., Gordeichik A. V., Usachev A. P.
Reconstruction of the air blower station at the wastewater treatment facilities in Chita
Summary
The results of the reconstruction of the wastewater treatment facilities in the city of Chita are presented with regard to the system of supplying air to the operating sections of the aeration tanks without replacing the air blower units. The main goal of the reconstruction was energy saving and automation of air supply to the aeration tanks while ensuring sufficient oxygen concentrations in the wastewater biological treatment facilities. To change the capacity of the air blowers the automation system includes two high-voltage frequency converters for the number of blowers in operation. To regulate the air supply eight regulated valves and eight dissolved oxygen sensors (for the number of operating sections) are installed in the sections of the aeration tanks. Energy savings over four months of operation amounted to about 16.4% compared to the same period of previous years.
Key words
frequency converter , sewerage treatment facilities , aeration tank , controllable air blower station , variable-frequency control of blowers
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UDC 628.35
Obuzdin S. Iu., Gubin D. I.
Reconstruction of the right-bank wastewater treatment facilities
of Irkutsk
Summary
Practically in all Russian cities the deterioration of the water and wastewater networks and facilities averages about 70%. Many of the facilities have been not only worn but also outmoded and do not meet the current technical and environmental requirements. The right-bank and left-bank wastewater treatment facilities of Irkutsk for many years have been overloaded: at the design capacity of 300 thousand m3/day the actual incoming wastewater flow has been 360 thousand m3/day. Lately, due to the significant reduction of the specific water consumption the incoming wastewater flow has reached 295 thousand m3/day. However the composition of the wastewater in relation to many parameters changed significantly; whereas the treatment efficiency lowered. As a result of the long time operation without heavy overhaul under the conditions of the corrosive wastewater a great number of reinforced concrete storage tanks, pipelines and equipment have been in poor state and need dismantling, repair, replacement and upgrade. In order to improve the efficiency of wastewater treatment the following basic process stages have been proposed: primary mechanical treatment; grit removal; biological treatment with nitrogen removal in the processes of nitrification-denitrification; chemical phosphorus removal by sedimentation method; enhanced treatment (organics and ammonia nitrogen removal) in a moving-bed bioreactor; suspended substances removal by enhanced tertiary treatment in sand filters; UV-disinfection. Upon complete reconstruction the required wastewater treatment level will meet the sanitary standards of the effluent quality to be discharged into water bodies.
Key words
reconstruction , sewerage treatment facilities , efficiency of treatment , wastewater composition
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UDC 628.336.71:628.477
DOI 10.35776/VST.2023.09.02
Rublevskaya O. N., Lysova Tat’iana, Sarkisov Artem
Sanitary and hygienic estimation of the impact of emissions of sludge incineration plants on the public health in St. Petersburg
Summary
The safety of the technologies applied for the disposal of wastewater sludge, in particular, the incineration technology, is confirmed by the results of emission control; it is an extremely important issue in the relationship between the water utilities responsible for this process and population served. The lack of available public data and information on the measures taken to ensure environmental protection and public health in the implementation and operation of sludge incineration technology does not provide for the population estimating to the full extent the current situation in such an important area of the urban economy. Explanations of approaches to sludge disposal and emission control in St. Petersburg are given on the basis of the actual document supported studies.
Key words
sludge , sewerage treatment facilities , sludge incineration plant , health risk assessment
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DOI 10.35776/VST.2022.12.07
UDC 628.21
Strelkov A. K., Gorshkalev P. A., Gridneva M. A., D’iachkov Vladislav
The system of operation of the Samara Region sewerage system
Summary
The results of analyzing the operation of the Samara Region sewerage system are presented. The state bodies have been involved in supervising the operation of sewer networks and wastewater disposal facilities. Information is given on the number of wastewater treatment facilities located in the municipalities of the Samara Region, and their affiliation with operating organizations. Through the example of the Bezenchukskii District of the Samara Region, the system of operating the sewerage system is considered. Subsequent to the results of the surveys of the wastewater treatment facilities a comparison was made of the actual inflow of wastewater with the design characteristics of the facilities, the quality of effluent based on MPC for fishery water bodies. Conclusions are drawn on the specific features of the operation of the facilities, taking into account the changes in the qualitative and quantitative indicators of raw wastewater.
Key words
wastewater , sewerage treatment facilities , maintenance , sewerage system , Samara Region
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UDC 628.31.085
Kostyuchenko S. V., Khrenov K. E., Khramenkov S. V., Streltsov S. A., Filatov N. N., Kvalvasser A. I., Koudryavtsev N. N., Volkov Sergei
The construction of the world biggest effluent disinfection facilities at the Kouryanovo wastewater treatment plant in Moscow
Summary
The drivers for choosing UV-radiation as a basic technology of effluent disinfection at the Kouryanovo and Lyubertsy wastewater treatment facilities are presented. The proven experience of UV-disinfection plant operating at the second line of the Novo-Lyubertsy wastewater treatment facilities gave rise to the next stage of introducing the given disinfection method at the Kouryanovo wastewater treatment facilities. In the course of designing it was decided to retrofit UV-disinfection plant into the existing elevation layout of the treatment facilities by using open-channel UV-plants with vertical lamp position. The specific features of the treatment facilities operation and the condition of the discharge canal also took into account.
Key words
chlorination , disinfection , ultraviolet , wastewater , sewerage treatment facilities , sanitation-and-epidemiological safety
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UDC 624.1:628.32
Rodionova T. A.
Enforcement of engineering structures of the aeration tanks at the Novo-Kur’ianovo wastewater treatment facilities
Summary
The technical solutions supported by calculations of the enforcement of foundations and substructures of the aeration tanks of the first and second lines of the Moscow Novo-Kur’ianovo wastewater treatment facilities are presented. In the process of operation the aeration tank engineering structures were subject to uneven subsidence that caused bottom and wall deformations. Probable causes of the carrying capacity loss of substructures and foundations are considered. Methods of aeration tank structure restoration with maximum use of the existing structures and substructure carrying capacities have been developed. The project includes building new in situ structures of complicated configuration inside the existing aeration tanks; a solution of enforcement exterior and dividing walls has been designed. The channels and flumes in the aeration tanks for nutrients removal have been designed.
Key words
sewerage treatment facilities , aeration tank , engineering structures , substructures and foundations , in situ wall
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UDC 628.336.515:621.311
Khrenov K. E., Khramenkov S. V., Pakhomov A. N., Streltsov S. A., Khamidov M. G., Belov N. A.
Utilization of Biogas and Creation of Autonomous Sources of Power Supply at Treatment Facilities
Summary
The process of methane fermentation of sludge generated in the course of wastewater treatment is used at sewerage treatment facilities of the MSUE Mosvodokanal. The complex reconstruction of heated digestion tanks is carried out since1998; as a result of it the output of biogas has been increased by 1,7 times – up to 250 000 m3/day. To rise the efficiency of using the biogas and reliability of power supply it was decided to construct two mini-heat electric power stations of 10 MWt capacity each. An investor, the Austrian concern EVN, has been selected on the competition base. The mini-heat electric power station at the Kuryanovo treatment facilities was put into operation in January 2009. This mini-HEPS ensures 50% of need in electric energy and 30% in heat energy. This project became one of the largest in the field of alternative power engineering and the first power station in Russia operating on biogas.
Key words
power saving , sewerage treatment facilities , methane fermentation of sludge , biogas , autonomous source of power supply
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