Combining submerged membrane technology with anaerobic and ...

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Denitrification with dissolved methane in an MBR after a methanogenic pre-treatment at ambient temperatureto the MBR, the OLR applied was between 0.1 and 0.9 kgCOD·m -3·d -1 , depending on thesuspended solids washed-out from the UASB reactor.Regarding MLVSS, the concentrations in the UASB reactor, the first MBR chamberand the membrane filtration chamber ranged between 28-35 g·L -1 , 2-5 g·L -1 and 4-8 g·L -1 ,respectively. Biomass concentration in the biofilm was around 45 gMLVSS·m -2 , which wasequivalent to an MLVSS concentration of approximately 6 g·L -1 . Sludge retention time(SRT), referred to the MBR, was maintained between 15 and 30 d during the wholeoperation. Anaerobic biomass was not purged from the UASB reactor during the study.Food to microorganism (F/M) ratio applied to the MBR was around 0.03 gCOD·gMLVSS -1·d -1 , referred to non-methane soluble COD. Dissolved oxygen concentration in the anoxiccompartment ranged between 0.1 and 0.3 mg·L -1 .6.4.2. Influence of dissolved methane on denitrificationThe remaining non-methane biodegradable COD and dissolved methane in theeffluents from the UASB can be used as carbon source for denitrification. Soluble COD inthe UASB effluent during the experiments was very low, 57±34 mg·L -1 . Moreover, VFAs inthe UASB effluent were monitored during the six experimental periods, being itsconcentration below minimum detection limit of the method used (20 mg·L -1 ). Dissolvedmethane in the influent to the MBR was normally between 19 and 25 mg·L -1 , except onperiod IV, when methane was stripped off and its concentration decreased to valuesbetween 3 and 8 mg·L -1 .Most of the total nitrogen in the effluent of the UASB reactor was present as solubleammonia (35.7±7.9 mg·L -1 ). Ammonia was fully nitrified during period I, during which thefirst MBR chamber was maintained under aerobic conditions. Dissolved total nitrogen(DTN) in the permeate was similar to the ammonia concentration fed to the MBR system(figure 6.2). Therefore, no nitrogen removal took place during this period. Moreover, afterthe first experimental days of period I, most of the ammonia oxidation to nitrate took placein the first chamber (figure 6.2b). During the first operating days of period II, completedenitrification of nitrate was observed in the first (anoxic) chamber. Later on, theconcentration of this compound increased. Significant nitrogen removal was also observedduring periods III, IV, V and VI, during which the first MBR chamber was operated underanoxic conditions. This caused a remarkable diminution of DTN in the permeate (figure6.2a). Up to 60% nitrogen removal was observed during periods II, III and VI.159
Chapter 6Figure 6.2. Evolution of (a) DTN concentration in the UASB effluent () and in thepermeate (•); (b) N-NH 4+(•) and N-NO x-concentration (Δ) in the first MBR chamberduring the six experimental periods.Denitrification could proceed using either dissolved methane, or remainingbiodegradable COD at the effluent of the UASB system. Thus, during period IV, methanewas stripped off from the UASB effluent in order to estimate the fraction of nitrogenremoved due to the remaining biodegradable COD. This caused a gradual increase ofDTN concentration in the permeate (figure 6.3). Soluble COD in the UASB effluent during160
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UNIVERSIDAD DE SANTIAGO DE COMPOSTE
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padres Macario y Marisa, les agrade
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2.1.2. Nitrogen compounds 662.1.2.1
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Chapter 4: Combining UASB and MBR f
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Objetivos y resumenEsta tesis se en
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Objetivos y resumenpermeabilidad de
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Objetivos y resumenuno de los pará
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Objetivos y resumenel sistema propu
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Objetivos y resumenconcentraciones
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Obxectivos e resumoauga tratada. O
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Obxectivos e resumoNo Capítulo 3,
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Obxectivos e resumog·L -1 , valore
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Obxectivos e resumoparámetros clav
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Objectives and summaryThis thesis i
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Objectives and summaryOn the basis
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Objectives and summaryfrom the MBR
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Objectives and summaryconsidering t
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Chapter 1IntroductionSummaryIn this
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IntroductionThe combination of memb
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IntroductionThe membranes should ha
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Introductionof water. Energy saving
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number of plants (cum. values)Intro
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IntroductionSubmerged MBR system in
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Introductionchanges of the foulant
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Introductionof 2% NaOH and 0.5% cit
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IntroductionFigure 1.8. Posible rel
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IntroductionSide-stream MBRs involv
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Introductionutilizes the advantages
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Introductionmeans of settlers, of s
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IntroductionUASB, achieving total n
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IntroductionEvenblij, H., van der G
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IntroductionMtinch, E.V., Ban, K.,
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IntroductionYang, S., Yang, F., Fu,
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Chapter 22.1. Liquid phaseIn this s
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Chapter 2where:M fas: molarity of F
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Acetic Acid (mg·L -1 )Chapter 2VFA
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N-NO 2-(mg·L -1 )Chapter 22.1.2.2.
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N-NO 3-(mg·L -1 )Chapter 2interfer
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P-PO 43-(mg·L -1 )Chapter 2Interfe
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Chapter 2alkalinity (IA), which is
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Chapter 22.2.3. Sludge volumetric i
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Chapter 2eq. 2.10eq. 2.11eq. 2.12Th
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Carbohydrate (mg·L -1 )Chapter 2In
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TEP (mgXG·L -1 )Chapter 22.4.4.4.
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Chapter 2Ripley, L.E., Boyle, W.C.,
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Chapter 33.1. IntroductionIn recent
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Chapter 3same in both modules; tap
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Chapter 3phases were varied (table
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Chapter 3to time was higher than 10
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COD removal (%)Chapter 3120100Perio
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DTN and N-NH 4+ (mg·L-1 )DTN and N
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Chapter 3operated with high MLTSS c
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TMP (kPa)TMP (kPa)TMP (kPa)TMP (kPa
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SMP carbohydrates (mg·L -1 )Chapte
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Volume (%)Chapter 3Therefore, the c
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Chapter 3identical to that of the c
Page 121 and 122: Chapter 3Massé, A. Spérandio, M.,
Page 123 and 124: Chapter 44.1. IntroductionThe appli
Page 125 and 126: Chapter 4support were added in this
Page 127 and 128: Chapter 4This cleaning was performe
Page 129 and 130: COD (mg·L -1 )COD removal (%)OLR (
Page 131 and 132: Chapter 4the recirculation ratio be
Page 133 and 134: (mg·L -1 )Chapter 4and ammonium) n
Page 135 and 136: Chapter 4recirculation from the MBR
Page 137 and 138: Chapter 4days 57 (period I) and 316
Page 139 and 140: Chapter 4excellent COD removal perf
Page 141 and 142: Chapter 4Rosenberger, S., Evenblij,
Page 143 and 144: Chapter 55.1. IntroductionAnaerobic
Page 145 and 146: Chapter 55.3. Material and methods5
Page 147 and 148: Chapter 5represented an increment o
Page 149 and 150: Chapter 5operating with similar mem
Page 151 and 152: Chapter 5behaviour might be related
Page 153 and 154: Fouling Rate (Pa·min -1 )Fouling R
Page 155 and 156: Concentration (mg·L -1 )DOC (mg·L
Page 157 and 158: Chapter 5in table 5.3 showed that h
Page 159 and 160: Chapter 5Ho, J., Sung, S. 2010. Met
Page 162 and 163: Chapter 6Denitrification with disso
Page 164 and 165: Denitrification with dissolved meth
Page 174 and 175: (mg·L -1 )Denitrification with dis
Page 176 and 177: DTN effluent (mg·L -1 )CH 4 desorb
Page 186 and 187: Chapter 7Membrane fouling in an AnM
Page 188 and 189: Membrane fouling in an AnMBR treati
Page 194 and 195: OLR and ORR(kgCOD ·m -3·d -1 )pHO
Page 196 and 197: TEP removed (mg·L -1 )OA removed (
Page 198 and 199: R col (m -1 )SRF (m·kg -1 )Membran
Page 200 and 201: BPC, cBPC and TEP concentration(mg
Page 202 and 203: Cake and Colloidal Resistance (m -1
Page 208: Membrane fouling in an AnMBR treati
Page 211 and 212: Conclusionessentido, el uso de una
Page 213 and 214: Conclusionesensuciamiento de la mem
Page 215 and 216: Conclusiónspresenza de soporte de
Page 217 and 218: Conclusións6. Aplicabilidade e per
Page 219 and 220: ConclusionsMoreover, biomass concen
Page 221 and 222: Conclusionstechnology and interesti
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List of symbolsHFHRTHyVABHollow Fib
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List of symbolsFR/J Normalized Foul
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List of publicationsBrand, C., Sán
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List of publicationsConference on E
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