Combining submerged membrane technology with anaerobic and ...

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Impact of a methanogenic pre-treatment on the performance of an aerobic MBR systemSMP C has been often cited as one of the main factors affecting MBR fouling (Le-Clech et al., 2006). Nevertheless, the results obtained in this study suggest a bettercorrelation of colloidal BPC (cBPC) and TEP with fouling rate than that obtained withSMP C. Both cBPC and TEP determinations are easy to perform, and are not so laboriousprocesses as SMP C. Nevertheless, from these two methods cBPC could be more reliable,as it depends only on DOC measurements. As can be observed in figure 5.2 and table 5.2,stable operation in terms of permeability and lower membrane fouling was achieved in theperiod II, coinciding with the lower values of the cBPC concentration. On the other hand,cBPC concentration increase led to a severe membrane fouling and hence rapid decreaseof permeability.5.4.4. Batch hydrolysis assaysThe relationship between cBPC concentration and membrane fouling might beattributed to the entrance of hydrolysis products of aerobic biomass recirculated to themethanogenic stage. It does not mean that recirculation is the only factor affecting fouling,since biomass concentration in membrane filtration chamber can also influence the foulingmechanisms and therefore membrane performance. Two parallel batch tests were carriedout in order to verify the hydrolysis of flocculent aerobic biomass recirculated to the UASBreactor could lead to a release of polymeric substances and hence, an increase in colloidalBPC concentration and membrane fouling. One of the tests was performed underanaerobic conditions while the other was performed in an aerobic environment. As can beobserved in figure 5.4, DOC and hence cBPC concentration increased remarkably withtime under anaerobic conditions while the same tendency was not observed for theaerobic environment. The results suggest that the hydrolysis of suspended aerobicbiomass in anaerobic conditions could lead to a release of biopolymers as a result ofdeflocculating process. Additionally, the experiment was repeated using aerobic biomassfrom a WWTP and the results obtained were similar (figure 5.4b).It was reported by Wilén et al. (2000) that activated sludge flocs deflocculated underanaerobic conditions, and they deflocculated more the longer the anaerobic period was.The deflocculated particles were mainly bacteria and floc fragments, although somesoluble EPS were also released.All the parameters typically reported as responsible for membrane fouling(Rosenberger et al., 2006; Sun et al., 2008; de la Torre et al., 2008; Drews, 2010) weremonitored during the anaerobic hydrolysis of aerobic biomass. As can be observed infigure 5.5, the anaerobic digestion at ambient temperature of aerobic biomass led to an141
Concentration (mg·L -1 )DOC (mg·L -1 )DOC (mg·L -1 )Chapter 5increase of SMP C, SMP P, TEP and cBPC concentrations, which confirms the negativeimpact of aerobic sludge hydrolysis on fouling properties.Figure 5.4. DOC concentration of the batch test performed in anaerobic (•) and aerobic() conditions using aerobic biomass from the aerobic stage of the system (a) andaerobic biomass from a municipal WWTP (b).70605040302010012010080604020a00 2 4 6 8Time (h)120100806040200b0 2 4 6 8Time (h)0 1 2 3 4 5 6Time (h)Figure 5.5. Concentration of proteins (∆), TEP (×), DOC (●) and carbohydrates (■) duringthe batch digestion of aerobic biomass by anaerobic biomass in anaerobic conditions.142
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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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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
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Page 147 and 148: Chapter 5represented an increment o
Page 149 and 150: Chapter 5operating with similar mem
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Page 153: Fouling Rate (Pa·min -1 )Fouling R
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
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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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