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.

Key words

nitrogen removal , Anammox , ANITA™Mox , IFAS , MBBR

“Water Supply and Sanitary Technique” Magazine, CONTENTS №9 (part 2) 2007

PROBLEMS, PERSPECTIVES
E. I. Pupyrev. The Water Code of the Russian Federation and Development of Technical Regulation System An attempt is made to analyze systemically the Water Code and the Law On Technical Regulation and to assess their impact on water management quality in Russia.	2
V. V. Petrashkevich. Testing of Conic Two-Chamber Fish Protection Facility The results of hydraulic-biologic tests demonstrate high reliability of the conic two-chamber fish protection facility.	9
A. S. Kopylov. Modern Methods of Complex Design of Waterside Ground Water Intakes The modern methods of complex design of waterside ground water intakes are considered.	13
E. Yu. Borovitskaya. Analysis of Ground Water Monitoring Results The results of monitoring during the whole period of water intakes operation, as applied to situations associated with sharp lowering of ground water levels and reduction in water wells output prior to taking a decision about new wells drilling are analyzed.	17
V. G. Chvyrev, A. F. Karniz, M. V. Semenov. Potable Water Disinfection under Extreme Situations The experience in potable water disinfection with the help of small electrolysis units to provide temporary water supply under extreme situations is presented.	25
S. M. Galkin Treatment Facilities of the WAVIN-Labko OY Co. (Finland) The experience of the Finnish firm WAVIN-Labko OY, a leading manufacturer of wastewater treatment systems, in cooperation with Russian enterprises is presented.	29
I. A. Ivleva, L. S. Alekseev, A. V. Boldin. Barrier Functions of Ground Water Treatment Technologies for Domestic Purposes Possibilities of the use of modern water treatment methods as the best accessible technologies for treatment of ground water buried at rather small depth (up to 120-140 m) in the systems of domestic water supply are analyzed.	33
A. N. Belevtsev, S. A. Baykova, V. I. Zhavoronkova, N. N. Melnikova, V. I. Nosenko. Evaluation of Efficiency of the Use of Ground Brucite Aquamag for Water Treatment Technologies The results of laboratory tests (conducted at the NII VODGEO Co.) of chemical and physical properties of two fractions of ground brucite Aquamag used as a reagent for removal of different chemical substances from natural and waste water are presented.	41
L. Styazhkova. Perm Sewerage System: 90 Years The history of creation and development of the sewerage system of the city of Perm is presented.	44
Abstracts of the Articles Published in the Issue № 9, part 2	48

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

Summary

Journal VST