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Author Diaz, C.; Belmonte, M.; Campos, J.L.; Franchi, O.; Faundez, M.; Vidal, G.; Argiz, L.; Pedrouso, A.; del Rio, A.V.; Mosquera-Corral, A.
Title Limits of the anammox process in granular systems to remove nitrogen at low temperature and nitrogen concentration Type
Year 2020 Publication Process Safety And Environmental Protection Abbreviated Journal Process Saf. Environ. Protect.
Volume 138 Issue Pages (down) 349-355
Keywords Anammox; Dissolved oxygen; Granular biomass; Nitrogen; SRT; Temperature
Abstract When partial nitritation-anammox (PN-AMX) processes are applied to treat the mainstream in wastewater treatment plants (WWTPs), it is difficult to fulfil the total nitrogen (TN) quality requirements established by the European Union (<10g TN/m(3)). The operation of the anammox process was evaluated here in a continuous stirred tank reactor operated at 15 degrees C and fed with concentrations of 50 g TN/m(3) (1.30 +/- 0.23 g NO2- -N/g NH4+-N). Two different aspects were identified as crucial, limiting nitrogen removal efficiency. On the one hand, the oxygen transferred from the air in contact with the mixed liquor surface favoured the nitrite oxidation to nitrate (up to 75 %) and this nitrate, in addition to the amount produced from the anammox reaction itself, worsened the effluent quality. On the other hand, the mass transfer of ammonium and nitrite to be converted inside the anammox granules involves relatively large values of apparent affinity constants (k(NH4+app) : 0.50 g NH4+-N/m(3) ; k(NO2-app) 0.17 g NO2--N/m(3)) that favour the presence of these nitrogen compounds in the produced effluent. The careful isolation of the reactor from air seeping and the fixation of right hydraulic and solids retention times are expected to help the maintenance of stability and effluent quality. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
Address [Diaz, Claudia; Belmonte, Marisol] Univ Playa Ancha, Fac Ingn, Lab Biotecnol Medio Ambiente & Ingn LABMAI, Avda Leopoldo Carvallo 270, Valparaiso 2340000, Chile, Email: jluis.campos@uai.cl
Corporate Author Thesis
Publisher Elsevier Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0957-5820 ISBN Medium
Area Expedition Conference
Notes WOS:000538807400005 Approved
Call Number UAI @ eduardo.moreno @ Serial 1193
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Author Argiz, L.; Reyes, C.; Belmonte, M.; Franchi, O.; Campo, R.; Fra-Vazquez, A.; del Rio, A.V.; Mosquera-Corral, A.; Campos, J.L.
Title Assessment of a fast method to predict the biochemical methane potential based on biodegradable COD obtained by fractionation respirometric tests Type
Year 2020 Publication Journal Of Environmental Management Abbreviated Journal J. Environ. Manage.
Volume 269 Issue Pages (down) 9 pp
Keywords Anaerobic digestion; Biodegradability; BMP; COD fractionation; Respirometric test
Abstract The biochemical methane potential test (BMP) is the most common analytical technique to predict the performance of anaerobic digesters. However, this assay is time-consuming (from 20 to over than 100 days) and consequently impractical when it is necessary to obtain a quick result. Several methods are available for faster BMP prediction but, unfortunately, there is still a lack of a clear alternative. Current aerobic tests underestimate the BMP of substrates since they only detect the easily biodegradable COD. In this context, the potential of COD fractionation respirometric assays, which allow the determination of the particulate slowly biodegradable fraction, was evaluated here as an alternative to early predict the BMP of substrates. Seven different origin waste streams were tested and the anaerobically biodegraded organic matter (CODmet) was compared with the different COD fractions. When considering adapted microorganisms, the appropriate operational conditions and the required biodegradation time, the differences between the CODmet, determined through BMP tests, and the biodegradable COD (CODb) obtained by respirometry, were not significant (CODmet (57.8026 +/- 21.2875) and CODb (55.6491 +/- 21.3417), t (5) = 0.189, p = 0.853). Therefore, results suggest that the BMP of a substrate might be early predicted from its CODb in only few hours. This methodology was validated by the performance of an inter-laboratory studyconsidering four additional substrates.
Address [Argiz, L.; Fra-Vazquez, A.; Val del Rio, A.; Mosquera-Corral, A.] Univ Santiago de Compostela, CRETUS Inst, Santiago De Compostela 15782, Galicia, Spain, Email: luciaargiz.montes@usc.es
Corporate Author Thesis
Publisher Academic Press Ltd- Elsevier Science Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0301-4797 ISBN Medium
Area Expedition Conference
Notes WOS:000541757200008 Approved
Call Number UAI @ eduardo.moreno @ Serial 1185
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