Oxidation-reduction potential (ORP) as a control parameter in a single-stage partial nitritation/anammox process treating reject water
2015 (English)In: Journal of chemical technology and biotechnology (1986), ISSN 0268-2575, E-ISSN 1097-4660Article in journal (Refereed) Epub ahead of print
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.
single-stage partial nitritation/anammox process, oxidation-reduction potential (ORP), process control strategy, reject water treatment
Research subject Civil and Architectural Engineering
IdentifiersURN: urn:nbn:se:kth:diva-186029DOI: 10.1002/jctb.4849OAI: oai:DiVA.org:kth-186029DiVA: diva2:924964
QP 2016042016-04-292016-04-292016-04-29Bibliographically approved