Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The deammonification in Moving Bed Biofilm Reactors
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Deammonification process appears to be a good alternative to treat reject water. In this thesis, control strategies were studied at pilot scale in order to optimise the deammonification process operated in a Moving Bed Biofilm Reactor (MBBR) for reject water treatment. The processes were monitored by microbial activity tests, Specific Anammox Activity (SAA), Oxygen Uptake Rate (OUR), and Nitrate Uptake Rate (NUR) tests, in order to measure the anammox, ammonium/nitrite oxidizers and denitrifiers activity. Aeration and redox as control parameters were tested. The results showed that intermittent aeration, with 15min non-aerated period in a one hour cycle, could reduce the aeration time without loss of process efficiency. A redox value of pE=0 gave the best operational condition even if there were different nitrogen loads applied in the system.

Pilot scale deammonification MBBR was tested towards to mainstream conditions. The reactor was run at different temperatures (25-19°C) to test the process stability and it was seen that the process started to become unstable when the temperature was at 19°C. Moreover, the combined treatment line, Upflow Anaerobic Sludge Blanket (UASB) reactor and MBBR with deammonification process, was established with the aim of being applied in mainstream treatment. The study results indicated that when the influent of the deammonification process shifted from reject water to UASB effluent (NH4+-N=100 mg/l), the process began to show unstable performance.

N2O was measured and compared in the deammonification process treating reject water in this study. Between 0.4% and 2 % of the nitrogen load was converted to N2O in pilot and full scale studies. The results indicated that there was no significant emission difference when the process was performed with continuous or intermittent aeration; the production and consumption of N2O was dependent on the nitrogen loads and DO concentration applied in the system.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. , 41 p.
Series
TRITA-LWR. PHD, ISSN 1650-8602 ; 2016:05
National Category
Environmental Engineering
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-185942ISBN: 978-91-7595-920-7 (print)OAI: oai:DiVA.org:kth-185942DiVA: diva2:924824
Public defence
2016-05-18, Sal F3, indstedtsvägen 26, Stockholm, 09:30 (English)
Opponent
Supervisors
Note

QC 20160429

Available from: 2016-04-29 Created: 2016-04-29 Last updated: 2016-04-29Bibliographically approved
List of papers
1. Evaluation of deammonification process performance at different aeration strategies
Open this publication in new window or tab >>Evaluation of deammonification process performance at different aeration strategies
2011 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 63, no 6, 1168-1176 p.Article in journal (Refereed) Published
Abstract [en]

In a deammonification process applied in the moving bed biofilm reactor (MBBR) oxygen is a crucial parameter for the process performance and efficiency. The objective of this study was to investigate different aeration strategies, characterised by the ratio between non-aerated and aerated phase times (R) and dissolved oxygen concentrations (DO). The series of batch tests were conducted with variable DO concentrations (2, 3, 4 mg L-1) and R values (0-continuous aeration; 1/3, 1, 3-intermittent aeration) but with the same initial ammonium concentration, volume of the moving bed and temperature. It was found that the impact of DO on deammonification was dependent on the R value. At R=0 and R=1/3, an increase of DO caused a significant increase in nitrogen removal rate, whereas for R=1 and R=3 similar rates of the process were observed irrespectively of the DO. The highest nitrogen removal rate of 3.33 g N m(-2) d(-1) (efficiency equal to 69.5%) was obtained at R=1/3 and DO=4 mg L-1. Significantly lower nitrogen removal rates (1.17-1.58 g N m(-2) d(-1)) were observed at R=1 and R=3 for each examined DO. It was a consequence reduced aerated phase duration times and lesser amounts of residual nitrite in non-aerated phases as compared to R 1/3.

Keyword
deammonification, dissolved oxygen, intermittent aeration, ratio between non-aerated and aerated phase timings
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-32222 (URN)10.2166/wst.2011.356 (DOI)000288852600012 ()2-s2.0-79955658157 (Scopus ID)
Note
QC 20110601Available from: 2011-06-01 Created: 2011-04-11 Last updated: 2017-12-11Bibliographically approved
2. Intermittent aeration in one-stage partial nitritation/anammox process
Open this publication in new window or tab >>Intermittent aeration in one-stage partial nitritation/anammox process
2015 (English)In: Ecological Engineering: The Journal of Ecotechnology, ISSN 0925-8574, E-ISSN 1872-6992, Vol. 75, 413-420 p.Article in journal (Refereed) Published
Abstract [en]

This study investigated the influence of different aeration strategies, characterized by the ratio (R) between non-aerated and aerated phase duration and dissolved oxygen concentration (DO), on one stage partial nitritation/anammox process performance and efficiency treating reject water. The activity of anammox bacteria, ammonium oxidizers, nitrite oxidizers and denitrifiers was determined by measuring specific anammox activity (SAA), oxygen uptake rate (OUR) and nitrate utilization rate (NUR). The results showed that with the same DO level during continuous aeration and intermittent aeration R = 1/3 (in one hour), nitrogen removal efficiencies were similar. This means that introduction of intermittent aeration with R = 1/3 can shorten the duration of aeration without any loss of process efficiency. Around 17-20% of the total decrease in ammonium and nitrate occurred in the non-aerated phase when intermittent aeration with R = 1/3 was applied. Moreover, introduction of non-aerated phases enhanced the activity of anammox bacteria and limited that of nitrite oxidizers.

Keyword
Anammox, Intermittent aeration, MBBR (Moving Bed Biofilm Reactor), Reject water
National Category
Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-161962 (URN)10.1016/j.ecoleng.2014.11.016 (DOI)000349598200050 ()2-s2.0-84919458675 (Scopus ID)
Note

QC 20150407

Available from: 2015-04-07 Created: 2015-03-20 Last updated: 2017-12-04Bibliographically approved
3. Oxidation-reduction potential (ORP) as a control parameter in a single-stage partial nitritation/anammox process treating reject water
Open this publication in new window or tab >>Oxidation-reduction potential (ORP) as a control parameter in a single-stage partial nitritation/anammox process treating reject water
Show others...
2015 (English)In: Journal of chemical technology and biotechnology (1986), ISSN 0268-2575, E-ISSN 1097-4660Article in journal (Refereed) Epub ahead of print
Abstract [en]

BBACKGROUND: Redox potential value (or pE) can be used as a monitoring parameter for deammonification processes treating reject water. In this study its use as a control parameter was investigated. Experiments were carried out with a one-stage partial nitritation/anammox process in a 200 L moving bed biofilm reactor (MBBR) with 40% filled Kaldnes biofilm carriers. RESULTS: Tests on different combinations of nitrogen loads (1.8-3.3 gN m-2 d-1) and pE values (-1, 0, 1) revealed that process performance was stable and nitrogen removal efficiency >80% was achieved at all tested pE values except pE=-1. A value close to pE=0 was the most suitable in terms of process performance at 25°C at all tested pE values. With a fixed redox potential value (pE=0) used in the system, the air supply adjusted automatically under different nitrogen loads and maintained a high nitrogen removal efficiency. Theoretical calculations showed that pE>0.15 (at pH=7) provides conditions for nitrite conversion into nitrate at 25°C. CONCLUSION: Redox control turned out to be a suitable control parameter for operation of a partial nitritation/anammox process. A redox value of 0 was a suitable value under different nitrogen loads in this pilot-scale study. 

Place, publisher, year, edition, pages
John Wiley & Sons, 2015
Keyword
single-stage partial nitritation/anammox process, oxidation-reduction potential (ORP), process control strategy, reject water treatment
National Category
Water Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-186029 (URN)10.1002/jctb.4849 (DOI)
Note

QP 201604

Available from: 2016-04-29 Created: 2016-04-29 Last updated: 2017-11-30Bibliographically approved
4. N2O emissions from a one stage partial nitrification/anammox process in moving bed biofilm reactors
Open this publication in new window or tab >>N2O emissions from a one stage partial nitrification/anammox process in moving bed biofilm reactors
2013 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 68, no 1, 144-152 p.Article in journal (Refereed) Published
Abstract [en]

Nitrous oxide (N2O) emissions from wastewater treatment are getting increased attention because their global warming potential is around 300 times that of carbon dioxide. The aim of the study was to measure nitrous oxide emissions from one stage partial nitrification/anammox (Anaerobic Ammonium Oxidation) reactors, where nitrogen is removed in a biological way. The first part of the experimental study was focused on the measurements of nitrous oxide emissions from two pilot scale reactors in the long term; one reactor with intermittent aeration at 25 degrees C and the other reactor with continuous aeration at 22-23 degrees C. The second part of the experiment was done to evaluate the influence of different nitrogen loads and aeration strategies, described by the ratio between the non-aerated and aerated phase and the dissolved oxygen concentrations, on nitrous oxide emissions from the process. The study showed that 0.4-2% of the nitrogen load was converted into nitrous oxide from two reactors. With higher nitrogen load, the amount of nitrous oxide emission was also higher. A larger fraction of nitrous oxide was emitted to the gas phase while less was emitted with the liquid effluent. It was also found that nitrous oxide emissions were similar under intermittent and continuous aeration.

Keyword
gas phase, liquid phase, moving bed biofilm reactor (MBBR), nitrous oxide emissions, one stage partial nitrification/anammox process
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-125788 (URN)10.2166/wst.2013.232 (DOI)000321336600017 ()2-s2.0-84881161081 (Scopus ID)
Funder
Formas
Note

QC 20130814

Available from: 2013-08-14 Created: 2013-08-13 Last updated: 2017-12-06Bibliographically approved
5. Nitrous oxide emissions from one-step partial nitritation/anammox processes
Open this publication in new window or tab >>Nitrous oxide emissions from one-step partial nitritation/anammox processes
(English)Manuscript (preprint) (Other (popular science, discussion, etc.))
Abstract [en]

Measurements of nitrous oxide were made at pilot and full scale plants to evaluate greenhouse gas emissions from one-step partial nitritation/anammox processes applied in moving bed biofilm reactors (MBBRs) treating reject water. It was found that 0.51-1.29% and 0.35-1.33 % of the total nitrogen loads in the pilot and full scale reactor, respectively, were emitted as nitrous oxide. Between 80-90% of nitrous oxide emissions were in gaseous form and the rest amount was found in the reactor effluent; over 90% of nitrous oxide emissions occurred in the aerated period and less than 8% in the non-aerated period in the full scale study. Nitrous oxide productions/consumptions were closely related to aeration and the nitrogen loads applied in the system.

Keyword
Gas phase, Liquid phase, Moving Bed Biofilm Reactor (MBBR), Nitrous oxide emission, Partial nitritation/anammox process
National Category
Engineering and Technology
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-186031 (URN)
Note

QC 20160524

Available from: 2016-04-29 Created: 2016-04-29 Last updated: 2016-05-24Bibliographically approved

Open Access in DiVA

fulltext(930 kB)145 downloads
File information
File name FULLTEXT02.pdfFile size 930 kBChecksum SHA-512
5d0bcd3d348a396d69a6a61caa9296eafb7968873c6fd19db93f589e1b76c957ecfc667595ce9d50f5527ff389238582af374dad9b9e4c50506a8cb5b629d41d
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Yang, Jingjing
By organisation
Land and Water Resources Engineering
Environmental Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 145 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 403 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf