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Impact of a methanogenic pre-treatment on the performance of an aerobic MBR systemhighest value corresponded to period III (0.036 kgCOD·kgMLVSS -1·d -1 ). During periods II,IV, VI and VII the F/M was around 0.025 kgCOD·kgMLVSS -1·d -1 . Regarding SRT, thevalues calculated in periods II, IV, V and VII, during which aerobic MLVSS were notrecycled to the UASB system, were very similar (between 12 and 16 d). In periods I, IIIand VI (with suspended biomass recirculation from the MBR to the UASB system) it wasdifficult to define a SRT, since a fraction of aerobic biomass was continually recirculatedbetween the UASB and MBR systems. Nevertheless, the amount of aerobic biomasspurged from the system was similar to that in periods without recirculation. Thus, variationsof SRT or F/M could be discharged to be the main cause of the observed MBR behaviour.Recovery cleanings were performed in periods I and III where recirculation was usedand also at the beginning of period VI, as a consequence of severe permeability loss at theend of period V. This confirmed the impact of plastic support and hydrolysis of aerobicbiomass in the methanogenic stage over membrane fouling. Moreover, membrane criticalflux was 20.2 ± 2.8 L·m -2·h -1 during the periods I, III, V and VI. . The highest critical fluxvalues were obtained during the periods II and IV, reaching 28.0 L·m -2·h -1 , with no aerobicsludge recycling and the presence of the plastic support in the aerobic biofilm chamber.5.4.3. Fouling indicatorsThe carbohydrate fraction of soluble microbial products (SMPc), transparentexopolymers (TEP) and biopolymer clusters (BPC) has been reported as possible foulingindicators (Rosenberger et al., 2006; Drews, 2010; Sun et al., 2008; de la Torre et al.,2008). In this study, these parameters were measured in order to establish a relationshipwith fouling rate and membrane performance. As can be observed in figure 5.3, certainlinear relationships between these indicators and fouling rate can be established. Thehigher was the concentration of each one of these parameters, the higher was the foulingrate. A linear correlation between SMPc and fouling rate has been reported previously bysome authors (Rosenberger et al., 2006) but not in the case of cBPC and TEP.BPC have been defined as a pool of non-filterable organic matter in the liquid phaseof the MBR sludge mixture much larger than SMP, being an important factor in theformation of the sludge fouling layer on the membrane surface and responsible for theincrease of fouling potential (Sun et al., 2008). TEP are very sticky particles that exhibit thecharacteristics of gels, and consist predominantly of acidic polysaccharides (Passow,2002). TEP has been recently reported as a useful tool for MBR investigation that mayhelp understanding the complex phenomenon of membrane fouling.139
Fouling Rate (Pa·min -1 )Fouling Rate (Pa·min -1 )Fouling Rate (Pa·min -1 )Chapter 53.02.52.01.51.00.50.03.02.52.01.51.00.50.0aR² = 0.470 20 40 60 80SMP Carbohydrates (mg·L -1 )bR² = 0.800 20 40 60 80 100 120 140Colloidal BPC (mg·L -1 )1.41.21.00.80.60.40.20.0cR² = 0.750 50 100 150 200 250 300TEP (mgXG·L -1 )Figure 5.3. Relationship between fouling rate and SMP C (a), cBPC (b) and TEP (c)concentration (●) during periods II, III, IV, V and VI. TEP was only measured on periodsIV, V and VI.140
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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
Page 101 and 102: Chapter 3same in both modules; tap
Page 103 and 104: Chapter 3phases were varied (table
Page 105 and 106: Chapter 3to time was higher than 10
Page 107 and 108: COD removal (%)Chapter 3120100Perio
Page 109 and 110: DTN and N-NH 4+ (mg·L-1 )DTN and N
Page 111 and 112: Chapter 3operated with high MLTSS c
Page 113 and 114: TMP (kPa)TMP (kPa)TMP (kPa)TMP (kPa
Page 115 and 116: SMP carbohydrates (mg·L -1 )Chapte
Page 117 and 118: Volume (%)Chapter 3Therefore, the c
Page 119 and 120: 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: Chapter 5behaviour might be related
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
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Cake and Colloidal Resistance (m -1
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Membrane fouling in an AnMBR treati
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Conclusionessentido, el uso de una
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Conclusionesensuciamiento de la mem
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Conclusiónspresenza de soporte de
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Conclusións6. Aplicabilidade e per
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ConclusionsMoreover, biomass concen
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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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