The influence of carrier size and shape in the moving bed biofilm process

2000 ◽  
Vol 41 (4-5) ◽  
pp. 383-391 ◽  
Author(s):  
H. Ødegaard ◽  
B. Gisvold ◽  
J. Strickland
Keyword(s):  
Surface Area ◽  
Municipal Wastewater ◽  
Specific Area ◽  
Moving Bed ◽  
Size And Shape ◽  
Biofilm Reactors ◽  
Biofilm Process ◽  
Surface Area Loading Rate ◽  
Carrier Size ◽  
Very High

The moving bed biofilm process is based on plastic carriers on which biomass attaches and grows. The original Kaldnes carrier was made of high-density polyethylene (density 0.95 gcm−1) that could be used in filling fractions (volume of carriers in empty reactor) up to 70% that gives a specific area of 350 m2m−3. Lately there has been an interest in the use of larger carrier elements, especially when using the process for upgrading of activated sludge plants. This paper analyses the influence of the carrier size and shape on performance, especially related to highly loaded plants working on municipal wastewater. The results demonstrate that moving bed biofilm reactors should be designed based on surface area loading rate (g COD/m2d) and that shape and size of the carrier do not seem to be significant as long as the effective surface area is the same. The results indicate that very high organic loads can be used in order to remove soluble COD but that the settleability of the sludge is negatively influenced at high loading rates.

Treatment of Dairy Wastewater in a Novel Moving Bed Biofilm Reactor

1992 ◽  
Vol 26 (3-4) ◽  
pp. 703-711 ◽  
Author(s):  
B. Rusten ◽  
H. Ødegaard ◽  
A. Lundar
Keyword(s):  
Surface Area ◽  
Pilot Plant ◽  
Industrial Effluents ◽  
Biofilm Reactor ◽  
Dairy Wastewater ◽  
Test Results ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Biofilm Reactors ◽  
In Series

A novel moving bed biofilm reactor has been developed, where the biofilm grows on small, free floating plastic elements with a large surface area and a density slightly less than 1.0 g/cm3. The specific biofilm surface area can be regulated as required, up to a maximum of approximately 400 m2/m3. The ability to remove organic matter from concentrated industrial effluents was tested in an aerobic pilot-plant with two moving bed biofilm reactors in series and a specific biofilm surface area of 276 m2/m3. Treating dairy wastewater, the pilot-plant showed 85% and 60% COD removal at volumetric organic loading rates of 500 g COD/m3h and 900 g COD/m3h respectively. Based on the test results, the moving bed biofilm reactors should be very suitable for treatment of food industry effluents.

Tertiary nitrification in pure oxygen moving bed biofilm reactors

2000 ◽  
Vol 41 (4-5) ◽  
pp. 361-368 ◽  
Author(s):  
L. Bonomo ◽  
G. Pastorelli ◽  
E. Quinto ◽  
G. Rinaldi
Keyword(s):  
Municipal Wastewater ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Pure Oxygen ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Typical Application ◽  
Moving Bed ◽  
Biofilm Reactors ◽  
Nitrogen Ratio

Two bench-scale reactors, fed with the secondary effluent of a municipal wastewater treatment plant (WWTP), were used in order to study tertiary nitrification in pure oxygen moving bed biofilm reactors (PO-MBBRs) with patented KMT® media as biofilm carriers. The process allowed to measure very high nitrification rates, both in ammonia limiting conditions (up to 7 gN m−2 d−1; oxygen-to-ammonia nitrogen ratio higher than 3–4 mgO2 (mgN)−1) and in oxygen limiting conditions (up to 8 gN m−2 d−1; oxygen-to-ammonia nitrogen ratio lower than 1–2 mgO2 (mgN)−1). Since the process proved flexible and reliable, it is suitable for full-scale application to municipal WWTPs. Typical application could regard, but is not limited to, tertiary nitrification of secondary effluent from existing high-purity oxygen activated sludge systems designed to achieve only organic carbon removal.

Advanced compact wastewater treatment based on coagulation and moving bed biofilm processes

2000 ◽  
Vol 42 (12) ◽  
pp. 33-48 ◽  
Author(s):  
H. Ødegaard
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Biofilm Reactor ◽  
Phosphate Removal ◽  
High Rate ◽  
Moving Bed ◽  
Considerable Saving ◽  
Treatment Processes ◽  
Pre Treatment ◽  
Biofilm Process

Advanced compact wastewater treatment processes are being looked for by cities all over the world as effluent standards are becoming more stringent and land available for treatment plants more scarce. In this paper it is demonstrated that a very substantial portion of the pollutants in municipal wastewater appears as particulate and colloidal matter. Pre-coagulation, therefore, gives very efficient pre-treatment that results in considerable saving in the total space required by the plant, especially when combined with a biofilm process for the removal of the soluble matter. A new biofilm process for this purpose is described. The moving bed biofilm process is based on plastic carriers, that move in the reactor, on which biomass attach and grow. The carriers are kept withinthe reactor by a sieve arrangement and biomass that is sloughing off the carriers is separated before effluent discharge. In addition to combining the moving bed biofilm process with pre-coagulation, the paper discusses also the use of a high-rate moving bed process combined with coagulation directly after the biofilm reactor in order to enhance separability. This results in very compact treatment plants for secondary treatment and possibly phosphate removal.

Simulation of nitrification of municipal wastewater in a Moving Bed™ biofilm process: a bottom-up approach based on a 2D-continuum model for growth and detachment

2007 ◽  
Vol 55 (8-9) ◽  
pp. 247-255 ◽  
Author(s):  
E. Alpkvist ◽  
J. Bengtsson ◽  
N. Chr. Overgaard ◽  
M. Christensson ◽  
A. Heyden
Keyword(s):  
Turnover Rate ◽  
Municipal Wastewater ◽  
Waste Water Treatment ◽  
Balance Model ◽  
Multidimensional Model ◽  
Bottom Up ◽  
Biofilm Growth ◽  
Moving Bed ◽  
Nitrification Process ◽  
Biofilm Process

This paper presents a complete mathematical model of a Moving Bed™ biofilm process for waste-water treatment, in particular for the nitrification process. The model is based on a bottom up approach adopting a multidimensional model for the biofilm growth and metabolism and a global mass balance model for the whole reactor. The model shows that oxygen is limiting the amount of biomass involved in the nitrification process. Furthermore, it suggests the existence of an optimal amount biomass for an optimal reactor turnover rate. Studies of two specific new suspended carriers show that the model output is dependable on the geometry of the carrier, and to a satisfactory extent agreeable with measurements.

scholarly journals Application of Moving Bed Biofilm Process for Biological Organics and Nutrients from Municipal Wastewater

2008 ◽  
Vol 4 (6) ◽  
pp. 675-682 ◽  
Author(s):  
M. Kermani ◽  
B. Bina ◽  
H. Movahedian ◽  
M.M. Amin ◽  
M. Nikaein
Keyword(s):  
Municipal Wastewater ◽  
Moving Bed ◽  
Biofilm Process

Nitrification of municipal wastewater in moving-bed biofilm reactors

1995 ◽  
Vol 67 (1) ◽  
pp. 75-86 ◽  
Author(s):  
Bjørn Rusten ◽  
Lars J. Hem ◽  
Hallvard Ødegaard
Keyword(s):  
Municipal Wastewater ◽  
Moving Bed ◽  
Biofilm Reactors
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