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UDC 628.356.1
Meshengisser Yu. M., Shchetinin A. I., Ostroushchenko N. G., Konnov V. N., Marchenko Yu. G., Mikhaylov V. K., Mikhaylov A. V., Minabutdinov A. S.
Aeration Systems of High Capacity
Summary
Design characteristics of aerators of high capacity produced by the Ecopolymer Group are presented. Comparing with other apparatus Ecopolymeraerators have the highest air flow capacity, in the process their mass-transfer characteristics remain at high level. An unique innovative toroidal AQUA-TOR aerator, which can easily substitute three standard 12-inch membrane aerators is described. An AQUA-TOR aerator membrane modification has been developed by the Ecopolymer Group in cooperation with SIF Patfil. The Ecopolymeraerators of various modifications – high efficient, reliable, having a long time of operation – operate in aeration tanks of any design and in wastewater of any composition.
Key words
aeration tank , aerator , air flow rate , mass-transfer properties , polyethylene pipes , dispersive elements
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UDC 628.334
Shchetinin A. I., Marchenko Yu. G.
Up-To-Date Equipment and Facilities for Mechanical Treatment of Wastewater from Coarse-Disperse Admixtures
Summary
Up-to-date equipment for wastewater treatment from coarse-disperse admixtures is considered. Designs of screens are described briefly, their advantages and shortcomings are presented. Formulas for calculation of head loss on sreens are presented. Recommendations to install screens with openings not less than 5 mm are made. The comparative analysis of different methods of sand-catchers design shows that the normative time of stay in sand catchers can be extended up to 10 minutes. Literary data treatment has made it possible to obtain formulas offered as a new calculation base for determination of efficiency of horizontal and aerated sand catchers during the designing. Up-to-date equipment for sand collection and removal is considered.
Key words
wastewater , mechanical treatment , hydrocyclone , aeration tank , screens , sand catchers
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DOI 10.35776/VST.2022.09.04
UDC 628.35
Kevbrina M. V., Dorofeev A. G., Agarev Anton
Comparison of the results of calculating aeration tanks according to different methods (for discussion)
Summary
The calculation results are compared according to the method described in the book by D. A. Danilovich and A. N. Epov «Calculation and technological design of processes and facilities for the removal of nitrogen and phosphorus from municipal wastewater», and the method given in the book «Wastewater technology. Processing and recovery of resources» (fifth edition, Metcalf & Addy), in a model unit, for which earlier in the article by V. N. Shvetsov, S. V. Stepanov and O. V. Khar’kina «Comparison of the calculation results for aeration tanks using the NII VODGEO/SamGTU and ASM2d models» calculations had been made according to the method of NII VODGEO/SamGTU and following the model developed by ASM2d. It is shown that calculations based on the equations of enzymatic kinetics and microbial growth (NII VODGEO/SamGTU, ASM2d and Metcalf & Addy) give similar results in terms of the volume of aeration tanks with the «tabular» method based on the German standard ATV-DVWK-A131E and revised taking into account the growth kinetics of nitrifying microorganisms. The difference in approaches gives different results as for the age of activated sludge; however, the final results of the volumes of aeration tanks and zones in them have discrepancies that do not exceed 15–20%. Simulation of the operation of aeration tanks in BioWin-3 program, designed on ASDM model that is essentially close to the ASM group of activated sludge models, with zone volumes calculated using different methods, showed a similar calculated quality of effluent. This confirms the possibility of any of the considered methods to adequately calculate the volumes of aeration tanks. The choice of the calculation method for each specific case depends on the availability and ease of use of the methodology, as well as on the personal preferences of the designer.
Key words
nitrification , denitrification , aeration tank , wastewater biological treatment , anaerobic zone , theoretical and empirical mathematical models , comparative calculation of the biological treatment facilities , technological calculation methods , anoxic zone
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UDC 628.35:661.635
Ambrosova G. T., Funk A. A., Ivanova Sargylana Dmitrievna, Ganzorig Shonkhor
Comparative evaluation of the methods of phosphorus removal from wastewater
Summary
The evaluation of the methods of eliminating phosphorus, a most important nutrient that is a limiting element in water body eutrophication, from wastewater is presented. Biological, physical, chemical and combined methods are considered that differ from each other in the method of implementation, construction and operating expenditures. The biological method is based on phosphorus removal through its utilization in biomass synthesis in the biological system. Physical and chemical methods suppose mandatory application of chemicals used for free phosphate-ion binding to low soluble ortho-phosphate. Combined methods suppose dephosphorization at the biological treatment stage with subsequent inclusion of phosphate-ions into crystals at the physical and chemical treatment stage. The examples of practical implementation of the methods are presented; process flow schemes are considered; the process parameters of the treatment facilities are pointed out where the process of phosphorus removal is taking place; the data on the process efficiency is provided; the advantages and drawbacks of the applied methods are reported. The experience of adjustment works is described together with the results of experimental selection of chemicals for phosphorus binding and determination of the optimal point of their addition carried out by the authors in the laboratory, during pilot and full-scale studies.
Key words
filter , nitrification , bioreactor , reagent , aeration tank , denitrification , nutrient , wastewater , crystal , dephosphorization , effluent polishing , sludge growth
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UDC 628.35:661.5
Lominoga O. A., Agapov D. V., Bol'shakov N. Yu.
The technology of biological wastewater treatment with nitrification-denitrification at the Zelenogorsk wastewater treatment facilities
Summary
The results of introducing the technology of biological wastewater treatment with the use of nitrification-denitrification processes in the «aeration tank-secondary settling tank» system at the Zelenogorsk wastewater treatment facilities are presented. It is shown that the use of nitrification-denitrification enhance significantly the efficiency of nitrogen removal. The findings allow recommending the suggested technical solution for the introduction at other municipal wastewater treatment facilities.
Key words
aeration , nitrification , nitri-denitrification , aeration tank , ammonia nitrogen , denitrification , organic substances , nitrate nitrogen , total nitrogen
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UDC 628.35:661.5
Danilovich Dmitrii, Smirnov Aleksandr Vladimirovich
The technology of step-feed nitri-denitrification in municipal wastewater treatment: the analysis of options and case record
Summary
The experience of MY PROJECT JSC in designing biological treatment facilities (aeration tanks) at the municipal treatment facilities of the Russian Federation with the use of step-feed nitri-denitrification is considered. Over the past 10 years more than 20 treatment facilities have been upgraded and built with the introduction of a step-feed scheme; the author of the article made a personal commitment in commissioning of more than 10 biological treatment facilities for municipal and industrial wastewater processing. In order to observe the data confidentiality, no data is provided on the chemical analysis of the operation of structures; however, with the help of mathematical modeling, the specific features of the implementation of step-feed denitrification are shown. The key process engineering aspects of the implementation of the schemes of a step-feed process with a different number of stages (two and three), cases of the need to use or reject nitrate recycling, as well as using, where applicable, an additional substrate (methanol) with particularly stringent requirements to the nitrogen concentration at the effluent discharge are considered. Traditionally, it is believed that the scheme of step-feed denitrification is designed for nitrogen removal; however, additional positive modifications of step-feed denitrification have been also considered that provide for arranging biological removal of phosphorus. The design of an anaerobic zone upstream the first denitrification cascade (D1), the use of step-feed denitrification in the implementation of the process scheme of the University of Johannesburg (JHB), as well as the arrangement of step-feed of return sludge are considered.
Key words
biological treatment , nitrification , denitrification , aeration tank , biological phosphorus removal , step-feed technology
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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 628.356
Kevbrina M. V., Belov N. A., Akmentina A. V., Ostapenko R. V.
The efficiency of aeration systems at the Moscow wastewater treatment facilities under field operating conditions
Summary
Aeration systems of aeration tanks are key elements of the wastewater treatment facilities. The main task in operating different types of aeration systems is ensuring high efficient atmospheric oxygen utilization at low energy consumption. The specialists of R&D Centre of «Mosvodokanal» JSC investigated the results of the long-term operation of the aeration systems at the Moscow wastewater treatment facilities under field operating conditions. The dependence of the aeration system efficiency on the ratio of surface areas of aerated zone and aeration tank; the air flow rate through one aerator at different options of aerators layout along the aeration tank length was studied. Regulating specific air consumption in the aeration tank zones provides for the optimal use of the available oxidation potential of the facilities without increasing aeration expenses or decreasing the efficiency of wastewater treatment. It was stated that when designing and choosing aeration systems it is necessary to find a balance between the surface area of the aerated zone in the aeration tank and efficiency of the aeration system. It was shown that when introducing nitrification-denitrification technologies without increasing capital and operating expenses for purchasing and maintaining mixing and aeration equipment both short-term and long-term shutdown of the aerators is possible to provide for alternate aeration without any efficiency loss. Perennial studies of the aeration systems produced by different manufacturers showed that the efficiency of the aeration systems during long-term operation is reduced by 25% of the design value. Therefore when choosing and designing an aeration system the reduction of the aeration system efficiency during the operation at the existing treatment facilities shall be taken into account aside from the required number of aerators and their layout.
Summary
wastewater , biological treatment , aeration tank , activated sludge , aeration system , efficiency of oxygen transfer
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