Tag:nitrogen removal

№4|2010

PROBLEMS, PERSPECTIVES

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UDC 628.35:661.5

DANILOVICH D. A., KOZLOV M. N., Moyzhes O. V., Nikolaev Yu. A., KAZAKOVA E. A., GRACHEV V. A.

Anaerobic Oxidation of Ammonium for Removal of Nitrogen from High-Concentrated Wastewater

Summary

The first in Russia study of the technique of anaerobic oxidation of ammonium (ANAMMOX) applied for treatment of return flows from dewatering of digested sludge is described. The two-stage technique ANAMMOX with the use of two processes – partial nitrification and the process of anaerobic oxidation of ammonium itself – has been realized under laboratory conditions. Efficiency of nitrogen removal in a reactor was 90%, volumetric capacity of the reactor by nitrogen was 0,16 kg/m3 per day. Results obtained show that the process of autotroph removal of nitrogen is an attractive alternative technologically and economically to the traditional technique of nitri-denitrification.

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№8|2013

WASTEWATER TREATMENT

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UDC 628.35:661.5

Zoubov M. G., Boyarenev S. F., Zoubov G. M., Koulikov N. I., Shramov Yu. M., Litty Yu. V., Nekrasova V. K., Nozhevnikova A. N.

Wastewater treatment biotechnology with activated sludge immobilization and nitrogen removal

Summary

The data on the development and introduction of advanced wastewater treatment biotechnology with activated sludge immobilization and nitrogen removal with the use of Anammox bacteria are presented. On the basis of laboratory studies and pilot tests full-scale wastewater treatment facilities have been designed. Their operation provides for the high economic, environmental and social effect.

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№3|2011

NEW TECHNOLOGIES AND EQUIPMENT

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UDC 628.356:661.5

KOZLOV M. N., Nikolaev Yu. A., GRACHEV V. A., Kharkina O. V., Dorofeev A. G.

Nitrification in the Course of Tertiary Treatment of Treated Wastewater with Floating Media

Summary

For complete oxidation of ammonium nitrogen at a wastewater aftertreatment stage it is proposed to use a bioreactor with floating media containing nitrifying microorganisms. Tests of the technology have been conducted with treated wastewater at the Kurianovskiye treatment facilities using the laboratory bioreactor with floating plastic media (60% by volume). After achievement of stable conditions of the bioreactor’s operation the technology proposed has ensured the reduction of ammonium nitrogen concentration by 4,8 mg/l at the average. Reasons for the reduction of efficiency of the bioreactor’s operation and appearance of nitrite-ions in the treated water when changing the technological conditions are presented.

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№5|2014

WASTEWATER TREATMENT

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UDC 628.35:661.63

KOZLOV M. N., Kevbrina M. V., Nikolaev Yu. A., Dorofeev A. G., GRACHEV V. A., KAZAKOVA E. A., Aseyeva V. G., Zharkov A. V.

Single-reactor technology of nitrogen removal from wastewater

Summary

The experts of R&D Centre of «Mosvodokanal» OJSC developed high-effective technology of removing nitrogen from wastewater. The technology was tested at the Kur’ianovo wastewater treatment plant of the city of Moscow during processing filtrate of the digested sludge belt thickeners. The method is based on the use of specific Anammox-bacteria that oxidize ammonium with nitrite under anoxic conditions. Filtrate is processed in a sequencing batch reactor with complete mixing (SBR-reactor). Partial nitrification processes (ammonium oxidation into nitrite), ammonium oxidation with nitrite and organic matter oxidation are carried out in one reactor. Retention of extremely slow growing biomass of Anammox-bacteria has been a critical problem for all the reactors. In this particular case the problem was solved with bacteria adhesion on the reactor walls and the feed as well as with flotation. To evaluate the treatment efficiency standard methods were used. The developed single-reactor modification of the anoxic oxidation of ammonium differs from the well-known by the following parameters: high nitrogen removal efficiency, the method of biomass bacteria retention in the reactor, the availability of new Anammox bacteria, heterotrophic denitrification. All other conditions being equal the integration of Anammox single-reactor technology requires the size of the facilities ten times smaller than double-reactor technology; for this reason it is more preferable for implementation. The new technology was given the name AUTOHETAMMOX.

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№5|2016

WASTEWATER TREATMENT

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UDC 628.35:661.5

К. Вун, Lemaire Romain, Zhao Hong, Christensson Magnus, M. Le Noir

Experience from start-up and operation of deammonification MBBR plants, and testing of a new deammonification IFAS configuration

Summary

A single-stage deammonification process utilizing biofilms on moving carriers in a mixed reactor (ANITA™Mox) is studied. Partial
nitritation and autotrophic N-removal occur simultaneously within the biofilm, where aerobic and anoxic zones result from oxygen mass transfer limitation. Ammonium oxidizing bacteria (AOB) oxidize NH4 to NO2 in the aerobic zone of the biofilm (i. e. external biofilm) while Anammox bacteria (AnAOB) located in the anoxic zone of the biofilm (i. e. internal biofilm) consume NO2 produced by AOB together with the excess NH4. The process has been implemented at full-scale as a Moving Bed Biofilm Reactor (MBBR) to treat reject water from dewatering of digested sludge. Startup of these installations was accelerated using a seeding strategy whereby 3–15% of carriers with established AOB/AnAOB biofilm were mixed with new carriers. N-removal rates up to 1.2 kgN/(m3react·d) have been observed in the full-scale process. The achievable rate is influenced by substrate transport inside the biofilm, which depends on factors such as biofilm density, thickness, temperature, and substrate concentrations. One possible strategy to increase the N-removal is to enhance substrate transport. Using Integrated Fixed-Film Activate Sludge (IFAS) to separate the nitritation and anammox reactions spatially, instead of adjacent in the same biofilm, allows the AOB to grow in suspended phase to better utilize DO, while allowing the biofilm to specialize in AnAOB reaction to achieve higher rates. A lower bulk DO can be used in this mode. Results from full-scale ANITA™Mox MBBR treating sidestream effluent are presented together with preliminary ANITA™Mox IFAS results from a 50 m3 full-scale prototype showing an increase in N-removal rate of up to 3 times that usually achieved in pure MBBR configuration.

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№10|2010

WASTEWATER SLUDGE TREATMENT

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UDC 628.35:661.5

Nikolaev Yu. A., KAZAKOVA E. A., Kharkina O. V., Dorofeev A. G.

Nitrogen Removal from Return Flows of Sludge Treatment Facilities by Means of Nitri-Denitrification Without an Additional Source of Carbon

Summary

Results of the study of the process of simultaneous nitri-denitrification using the nitrite for removal of ammonium from the filtrate of belt thickeners of digested sludge at the Kuryanovo treatment facilities are presented. Introduction of the developed technology of biological treatment of wastewater containing ammonium nitrogen of high concentration and stripped with organic compounds readily oxidized without an additional source of organic carbon makes it possible to obtain the high efficiency of removal of nitrogen, suspended substances, COD, BOD5. Microorganisms capable to make denitrification using the organic substances not easily available that determines properties of activated sludge have been separated from activated sludge of a laboratory reactor.

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