Nitrogen Removal Characteristics and Biofilm Analysis of a Membrane-Aerated Biofilm Reactor Applicable to High-Strength Nitrogenous Wastewater Treatment.

2003 ◽  
Vol 95 (2) ◽  
pp. 170-178 ◽  
Author(s):  
AKIHIKO TERADA ◽  
KAZUAKI HIBIYA ◽  
JUN NAGAI ◽  
SATOSHI TSUNEDA ◽  
AKIRA HIRATA
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
High Strength ◽  
Biofilm Reactor

Simulation study supporting wastewater treatment plant upgrading

2002 ◽  
Vol 46 (4-5) ◽  
pp. 325-332 ◽  
Author(s):  
N. Hvala ◽  
D. Vrečko ◽  
O. Burica ◽  
M. Strazžar ◽  
M. Levstek
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Process Model ◽  
Treatment Plant ◽  
Biofilm Reactor ◽  
Conventional Activated Sludge ◽  
Improved Performance ◽  
Plant Configuration ◽  
Plant Behaviour

The paper presents a study where upgrading of an existing wastewater treatment plant was supported by simulation. The aim of the work was to decide between two technologies to improve nitrogen removal: a conventional activated sludge process (ASP) and a moving bed biofilm reactor (MBBR). To perform simulations, the mathematical models of both processes were designed. The models were calibrated based on data from ASP and MBBR pilot plants operating in parallel on the existing plant. Only two kinetic parameters needed to be adjusted to represent the real plant behaviour. Steady-state analyses have shown a similar efficiency of both processes in relation to carbon removal, but improved performance of MBBR in relation to nitrogen removal. Better performance of MBBR can be expected especially at low temperatures. Simulations have not confirmed the expected less volume required for the MBBR process. Finally, the MBBR was chosen for plant upgrading. The developed process model will be further used to evaluate the final plant configuration and to optimise the plant operating parameters.

Application of a sponge media (BioCube) process for upgrading and expansion of existing caprolactam wastewater treatment plant for nitrogen removal

2004 ◽  
Vol 50 (6) ◽  
pp. 163-171 ◽  
Author(s):  
K.J. Chae ◽  
S.K. Yim ◽  
K.H. Choi
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Pilot Plant ◽  
Treatment Plant ◽  
High Strength ◽  
Organics Removal ◽  
Large Fluctuations ◽  
The Media ◽  
Sponge Media

For the upgrade and expansion of an existing caprolactam wastewater treatment plant, a freely floating sponge media (BioCube) process was selected based on extensive pilot-plant tests, due to extreme space constraints. In order to protect nitrifier inhibition caused by high strength organics in caprolactam wastewater, the pilot plant consisted of an organics removal reactor, which functioned as a pretreatment for nitrification, and followed the nitrogen removal reactor. The suspended MLSS was 1,800-4,000 and the media attached MLSS was maintained at 22,000-26,000 mg/L. The final effluent COD was noticeably low, around 20.4-37 mg/L, even with fairly large fluctuations in the feed levels, between 1,400-6,770 mg/L. The removal of total nitrogen with the system, when denitrification was close to completion, was approximately 97.6%. For the entire run, complete nitrification of 99.6% was achieved, which might have been due to well-acclimatized nitrifiers attached in the BioCube media. Specifically, after adaptation, the nitrification continuously increased in the organics removal reactor, even under high residual organics conditions. From the numerous experimental results, the BioCube process seemed to be an effective method for the upgrading and expansion of the existing wastewater treatment plant, with minimum reactor enlargement.

scholarly journals Application of a moving-bed biofilm reactor for sulfur-oxidizing autotrophic denitrification

2017 ◽  
Vol 77 (4) ◽  
pp. 1027-1034 ◽  
Author(s):  
Yan-Xiang Cui ◽  
Di Wu ◽  
Hamish R. Mackey ◽  
Ho-Kwong Chui ◽  
Guang-Hao Chen
Keyword(s):  
Wastewater Treatment ◽  
Steady State ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Biofilm Reactor ◽  
Laboratory Scale ◽  
Autotrophic Denitrification ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Sulfur Oxidizing

Abstract Sulfur-oxidizing autotrophic denitrification (SO-AD) was investigated in a laboratory-scale moving-bed biofilm reactor (MBBR) at a sewage temperature of 22 °C. A synthetic wastewater with nitrate, sulfide and thiosulfate was fed into the MBBR. After 20 days' acclimation, the reduced sulfur compounds were completely oxidized and nitrogen removal efficiency achieved up to 82%. The operation proceeded to examine the denitrification by decreasing hydraulic retention time (HRT) from 12 to 4 h in stages. At steady state, this laboratory-scale SO-AD MBBR achieved the nitrogen removal efficiency of 94% at the volumetric loading rate of 0.18 kg N·(mreactor3·d)−1. The biofilm formation was examined periodically: the attached volatile solids (AVS) gradually increased corresponding to the decrease of HRT and stabilized at about 1,300 mg AVS·Lreactor−1 at steady state. This study demonstrated that without adding external organic carbon, SO-AD can be successfully applied in moving-bed carriers. The application of SO-AD MBBR has shown the potential for sulfur-containing industrial wastewater treatment, brackish wastewater treatment and the upgrading of the activated sludge system. Moreover, the study provides direct design information for the full-scale MBBR application of the sulfur-cycle based SANI process.

Increased nitrogen removal in existing volumes at Sundet wastewater treatment plant, Växjö

2014 ◽  
Vol 9 (2) ◽  
pp. 215-224 ◽  
Author(s):  
Anneli Andersson Chan ◽  
Niklas Johansson ◽  
Magnus Christensson
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Biofilm Reactor ◽  
Main Stream ◽  
Ammonium Oxidation ◽  
N Removal

Many wastewater treatment plants need to improve their nitrogen removal due to stricter requirements and increasing loads. This often means larger bioreactor volumes, which can be very expensive and is sometimes impossible if space is limited. Therefore, there is a need for compact hybrid solutions that can increase capacity within existing volumes. Two full-scale demonstration projects using moving bed biofilm reactor (MBBR) technology has proven to be an efficient way to treat nitrogen in existing volumes at Sundet wastewater treatment plant in Växjö. Increased nitrification and denitrification capacity in parts of the main stream were demonstrated through the Hybas™ process, a combination of MBBR and activated sludge using the integrated fixed-film activated sludge technology. The ANITA™ Mox process, using autotrophic N-removal through anaerobic ammonium oxidation (anammox), provided high nitrogen removal for the sludge liquor. Data collected on-site for over a year are analyzed and compared with the performance of conventional treatment systems. These two full-scale demonstration projects have been a successful learning experience in identifying and correcting both process and operational issues, which may not have arisen at pilot scale. The set objectives in terms of nitrogen removal were met for both processes and design modifications have been identified that will improve future operation at Sundet WWTP.

High-strength nitrogenous wastewater treatment in biofilm and granule anammox processes

2009 ◽  
Vol 60 (9) ◽  
pp. 2365-2371 ◽  
Author(s):  
I. Kim ◽  
H. H. Lee ◽  
Y. C. Chung ◽  
J. Y. Jung
Keyword(s):  
Wastewater Treatment ◽  
Total Nitrogen ◽  
Nitrogen Concentration ◽  
High Strength ◽  
Biofilm Reactor ◽  
Woven Fabric ◽  
Ammonium Oxidation ◽  
N Removal ◽  
Total Nitrogen Concentration ◽  
Removal Efficiencies

Biofilm and granule reactors were employed to remove nitrogen via an anammox reaction applying synthetic nitrogen wastewater, whose concentration was in the range of 20 to 1,400 mg N/L as total nitrogen. A biofilm reactor was packed with non-woven fabric and a granule reactor was filled with anaerobic granular sludge taken from the brewery wastewater treatment plant. Both reactors were seeded with Planctomycetes KSU-1 and operated for 450 days. The biofilm reactor showed high NH4+-N and NO2−-N removal efficiencies of over 88% and 94%, respectively, until total nitrogen concentration was reached at 800 mg N/L. However, the biofilm reactor showed severe inhibition at over 1,000 mg N/L of total nitrogen due to nitrogen overloading. The granule reactor revealed better nitrogen removal performance than the biofilm reactor, showing high NH4+-N and NO2−-N removal efficiencies of over 90%, even at a total nitrogen concentration of 1,400 mg N/L. However, aggregation of anammox bacteria grown in the sludge bed after long-term operation resulted in the deterioration of nitrogen. The removal ratio of NH4+-N and NO2−-N was close to 1:1, suggesting other reactions related to ammonium oxidation could occur simultaneously. Free ammonia inhibition as well as NO2−-N could be significant when high-strength nitrogenous wastewater was applied.

Pilot testing and preliminary design of moving bed biofilm reactors for nitrogen removal at the FREVAR wastewater treatment plant

2000 ◽  
Vol 41 (4-5) ◽  
pp. 13-20 ◽  
Author(s):  
B. Rusten ◽  
B.G. Hellström ◽  
F. Hellström ◽  
O. Sehested ◽  
E. Skjelfoss ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Pilot Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Biofilm Reactor ◽  
Nitrification Rate ◽  
Total N ◽  
Moving Bed

A moving bed biofilm reactor (MBBR) pilot plant, using Kaldnes type K1 biofilm carriers, was tested for nitrogen removal at the FREVAR wastewater treatment plant. The pilot plant was fed primary treated municipal wastewater, at temperatures from 4.8 to about 20°C. The results showed that a reasonable design nitrification rate will be 190 g TKN/m3d, at 10°C and a reactor pH≥7.0. Pre-denitrification was very dependent on the concentration of readily biodegradable organic matter and the amount of oxygen in the influent to the first anoxic MBBR. It was found that a MBBR process for nitrogen removal at FREVAR will require a total reactor volume corresponding to an empty bed hydraulic retention time of 4–5 hours at average design influent flow. This was based on an influent concentration of 25 mg total N/l, 70% annual average removal of total N and a treatment process consisting of primary treatment, MBBRs with combined pre- and post-denitrification, and followed by coagulation/flocculation and a final solids separation stage.

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