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Andersson-Chan, AnneliORCID iD iconorcid.org/0000-0003-4983-8229
Alternative names
Publications (8 of 8) Show all publications
Andersson Chan, A. (2015). Experience with Anammox Sludge Liquor Treatment and up-coming Challenges with Thermal Hydrolysis Effluents at The Sundet Wastewater Treatment Plant, Vaxjo Sweden. In: Water and Energy, Washington June 8-10 2015: . Paper presented at Water and Energy, Washington June 8-10 2015.
Open this publication in new window or tab >>Experience with Anammox Sludge Liquor Treatment and up-coming Challenges with Thermal Hydrolysis Effluents at The Sundet Wastewater Treatment Plant, Vaxjo Sweden
2015 (English)In: Water and Energy, Washington June 8-10 2015, 2015Conference paper, Oral presentation with published abstract (Refereed)
National Category
Civil Engineering
Research subject
Technology (byts ev till Engineering)
Identifiers
urn:nbn:se:lnu:diva-43433 (URN)
Conference
Water and Energy, Washington June 8-10 2015
Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
Andersson Chan, A. (2015). Sustainable Biogas Production in the Greenest City in Europe. In: IBIO 2015 - BIT's 8th World Congress of Industrial Biotechnology, Nanjing China April 25-28: . Paper presented at IBIO 2015 - BIT's 8th World Congress of Industrial Biotechnology, Nanjing China April 25-28.
Open this publication in new window or tab >>Sustainable Biogas Production in the Greenest City in Europe
2015 (English)In: IBIO 2015 - BIT's 8th World Congress of Industrial Biotechnology, Nanjing China April 25-28, 2015Conference paper, Oral presentation with published abstract (Other (popular science, discussion, etc.))
National Category
Civil Engineering
Research subject
Technology (byts ev till Engineering)
Identifiers
urn:nbn:se:lnu:diva-43435 (URN)
Conference
IBIO 2015 - BIT's 8th World Congress of Industrial Biotechnology, Nanjing China April 25-28
Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
Andersson Chan, A., Johansson, N. & Christensson, M. (2014). Increased nitrogen removal in existing volumes at Sundet wastewater treatment plant, Växjö. Water practice and technology, 9(2), 215-224
Open this publication in new window or tab >>Increased nitrogen removal in existing volumes at Sundet wastewater treatment plant, Växjö
2014 (English)In: Water practice and technology, E-ISSN 1751-231X, Vol. 9, no 2, p. 215-224Article in journal (Refereed) Published
Abstract [en]

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.

National Category
Civil Engineering Water Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-43427 (URN)10.2166/wpt.2014.025 (DOI)
Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
Christensson, M., Ekström, S., Andersson Chan, A., Le Vaillant, E. & Lemaire, R. (2013). Experience from start-ups of the first ANITA Mox Plants . Water Science and Technology, 67(12), 2677-2684
Open this publication in new window or tab >>Experience from start-ups of the first ANITA Mox Plants
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2013 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 67, no 12, p. 2677-2684Article in journal (Refereed) Published
Abstract [en]

ANITA (TM) Mox is a new one-stage deammonification Moving-Bed Biofilm Reactor (MBBR) developed for partial nitrification to nitrite and autotrophic N-removal from N-rich effluents. This deammonification process offers many advantages such as dramatically reduced oxygen requirements, no chemical oxygen demand requirement, lower sludge production, no pre-treatment or requirement of chemicals and thereby being an energy and cost efficient nitrogen removal process. An innovative seeding strategy, the 'BioFarm concept', has been developed in order to decrease the start-up time of new ANITA Moxinstallations. New ANITA Mox installations are started with typically 3-15% of the added carriers being from the 'BioFarm', with already established anammox biofilm, the rest being new carriers. The first ANITA Mox plant, started up in 2010 at Sjolunda wastewater treatment plant (WWTP) in Malmo, Sweden, proved this seeding concept, reaching an ammonium removal rate of 1.2 kgN/m(3) d and approximately 90% ammonia removal within 4 months from start-up. Thisfirst ANITA Mox plant is also the BioFarm used for forthcoming installations. Typical features of this first installation were low energy consumption, 1.5 kW/NH4-N-removed, low N2O emissions, <1% of the reduced nitrogen and a very stable and robust process towards variations in loads and process conditions. The second ANITA Mox plant, started up at Sundets WWTP in Vaxjo, Sweden, reached full capacity with more than 90% ammonia removal within 2 months from start-up. By applying a nitrogen loading strategy to the reactor that matches the capacity of the seeding carriers, more than 80% nitrogen removal could be obtained throughout the start-up period.

National Category
Civil Engineering Water Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-43429 (URN)10.2166/wst.2013.156 (DOI)000321336200003 ()23787303 (PubMedID)
Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
Andersson Chan, A. (2013). Increased nitrogen removal in existing volumes at the Sundet wastewater treatment plant, Växjö. In: : . Paper presented at NORDIWA 2013, 13th Nordic Wastewater Conference, October 8–10, 2013 in Malmö, Sweden.
Open this publication in new window or tab >>Increased nitrogen removal in existing volumes at the Sundet wastewater treatment plant, Växjö
2013 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The HELCOM Baltic Sea Action Plan is an ambitious program to obtain good ecological status of the Baltic marine environment by 2021. Sweden has a preliminary commitment to reduce nitrogen by 21 000 ton, partly from the wastewater sector (3 000 ton nitrogen), and due to this many wastewater treatment plants need to improve their nitrogen removal. On top of that, the incoming load of nitrogen is increasing due to rising protein consumption. Co-digestion of external substrates (often rich in nitrogen) with wastewater sludge for increased biogas production further contributes to higher nitrogen loads. Increased nitrogen removal capacity often means more bioreactor volumes, which can be very expensive and sometimes impossible if space is limited. Therefore, there is a need for compact hybrid solutions that can increase capacity within existing volumes.

The Sundet WWTP in Växjö received a new environmental permit in 2010 for 95 000 pe. Emission criteria for treated water are 10 mg BOD7/l, 0.2 mg P/l, and 60% nitrification. During a five year evaluation period (2012- 2016) assessments to ensure 15 mg N/l in the effluent should be conducted. To increase the nitrogen removal capacity within existing volumes, two processes using MBBR technology with plastic carriers were chosen:

• Increased nitrification capacity in the existing activated sludge system through the Hybas™ combination process of MBBR and activated sludge (Integrated Fixed-Film Activated Sludge, IFAS).

• Separate biological treatment of sludge liquor with the AnitaMox™ process, using autotrophic Nremoval through anaerobic ammonium oxidation (anammox) in a one-stage process with carriers.

One of the six treatment trains was rebuilt to fit the integrated fixed-film activated sludge process for improved nitrification. The anoxic zone in this train was doubled for improved denitrification capacity. Data collected onsite from over a year (from October 2011 to present) are analyzed and compared with the performance of a conventional activated sludge train operated in parallel.

The Hybas trained nitrified more consistently than the reference train, with effluent concentrations <1 mg NH4- N/l for most of the time. To keep the nitrification capacity in the reference train during the winter, a higher MLSS concentration was required, as well as larger aerated volumes. This lead to inadequate denitrification, while the capacity was substantially higher in the Hybas train, with emission concentrations well under the objective of 15 mg N/l. No additional carbon was added to the system. Practical experiences concerning operational requirements and challenges of the Hybas process (air flow and hydraulic loading, carrier management, and nutrient limitations) are discussed in the paper.

The existing sludge liquor treatment (SBR, sequence batch reactor) was retrofitted in 2011 to an AnitaMox process. Thanks to a seeding start-up strategy, the process reached full capacity with more than 90% ammonia removal within two months from start-up. By applying a nitrogen loading strategy to the reactor that matches the capacity of the seeding carriers, more than 80% nitrogen removal could be obtained throughout the start-up period. Full-scale experiences from more than a year has proven AnitaMox to be an energy- and cost efficient nitrogen removal process compared to the previous SBR process, and at the same time robust and relatively simple to operate. However, an increased process control and more on-line instruments require resources and qualified personnel.

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 will improve the future operation at the Sundet WWTP.

National Category
Civil Engineering
Identifiers
urn:nbn:se:lnu:diva-43436 (URN)
Conference
NORDIWA 2013, 13th Nordic Wastewater Conference, October 8–10, 2013 in Malmö, Sweden
Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
Andersson Chan, A., Johansson, N. & Christensson, M. (2013). Växjö - a holistic approach to increased biogas production. In: Sludge Management and Anaerobic Digestion in a Broad Holistic System Perspective, 6-8 May 2013, Västerås, Sweden.: . Paper presented at Sludge Management and Anaerobic Digestion in a Broad Holistic System Perspective, 6-8 May 2013, Västerås, Sweden..
Open this publication in new window or tab >>Växjö - a holistic approach to increased biogas production
2013 (English)In: Sludge Management and Anaerobic Digestion in a Broad Holistic System Perspective, 6-8 May 2013, Västerås, Sweden., 2013Conference paper, Oral presentation with published abstract (Refereed)
National Category
Civil Engineering
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-43437 (URN)
Conference
Sludge Management and Anaerobic Digestion in a Broad Holistic System Perspective, 6-8 May 2013, Västerås, Sweden.
Note

Ej belagd.

Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
Andersson Chan, A. (2006). Biofiltration of Odorous Gas Emissions. (Doctoral dissertation). Luleå tekniska universitet
Open this publication in new window or tab >>Biofiltration of Odorous Gas Emissions
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå tekniska universitet, 2006. p. 54
Series
Doctoral thesis / Luleå University of Technology, ISSN 1402-1544 ; 2006:20
National Category
Civil Engineering
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
urn:nbn:se:lnu:diva-43432 (URN)
Supervisors
Available from: 2015-12-11 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
Andersson, A., Laurent, P., Kihn, A., Prévost, M. & Servais, P. (2001). Impact of temperature on nitrification in biological activated carbon (BAC) filters used for drinking water treatment. Water Research, 35(12), 2923-2934
Open this publication in new window or tab >>Impact of temperature on nitrification in biological activated carbon (BAC) filters used for drinking water treatment
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2001 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 35, no 12, p. 2923-2934Article in journal (Refereed) Published
Abstract [en]

The impact of temperature on nitrification in biological granular activated carbon (GAC) filters was evaluated in order to improve the understanding of the nitrification process in drinking water treatment. The study was conducted in a northern climate where very cold water temperatures (below 2°C) prevail for extended periods and rapid shifts of temperature are frequent in the spring and fall. Ammonia removals were monitored and the fixed nitrifying biomass was measured using a method of potential nitrifying activity. The impact of temperature was evaluated on two different filter media: an opened superstructure wood-based activated carbon and a closed superstructure activated carbon-based on bituminous coal. The study was conducted at two levels: pilot scale (first-stage filters) and full-scale (second-stage filters) and the results indicate a strong temperature impact on nitrification activity. Ammonia removal capacities ranged from 40 to 90% in pilot filters, at temperatures above 10°C, while more than 90% ammonia was removed in the full-scale filters for the same temperature range. At moderate temperatures (4–10°C), the first stage pilot filters removed 10–40% of incoming ammonia for both media (opened and closed superstructure). In the full-scale filters, a difference between the two media in nitrification performances was observed at moderate temperatures: the ammonia removal rate in the opened superstructure support (more than 90%) was higher than in the closed superstructure support (45%). At low temperatures (below 4°C) both media performed poorly. Ammonia removal capacities were below 30% in both pilot- and full-scale filters.

National Category
Civil Engineering
Identifiers
urn:nbn:se:lnu:diva-43430 (URN)10.1016/S0043-1354(00)00579-0 (DOI)
Available from: 2015-05-28 Created: 2015-05-28 Last updated: 2019-12-13Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4983-8229

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