Combining submerged membrane technology with anaerobic and ...

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Permeability (L·m -2·h -1·bar -1 )colloidal BPC (mg·L -1 )Permeability (L·m -2·h -1·bar -1 )colloidal BPC (mg·L -1 )Impact of a methanogenic pre-treatment on the performance of an aerobic MBR system500IIIIIIa20040015030010020010050000 50 100 150 200 250 300 350 400 450 500 550Time (d)500IV V VI b200400150300100200100500540 590 640 690Time (d)0Figure 5.2. Permeability (•) and cBPC concentration () during periods I-III (a) andperiods IV-VI (b).The observed increase of cBPC concentration did not take place at the point whenthe plastic support was removed, but after more than 20 operating days (figure 5.2b).cBPC levels were similar to those observed for periods I and III, during which biomass wasrecirculated from the aerobic biofilm chamber to the UASB reactor. The reason of such137
Chapter 5behaviour might be related with a shift of the microbial community caused by the removalof the carrier. Microscopic observation showed a great amount of attached ciliatedprotozoa in the biofilm. Hypothetically, the absence of these filtering organisms caused theincrease of colloidal biopolymer concentration. Although digestion of detrital colloids byprotozoans is not fully understood, assimilation of some forms of colloidal exopolymers byprotozoans has been reported (Sherr, 1988). Thus, the use of a carrier would be beneficialfor promoting development of filtering protozoa, diminishing cBPC levels and enhancingthe membrane performance. The beneficial effects of carriers on membrane fouling werealso reported previously by other authors in an MBR system with both suspended biomassand biofilms (Liu et al., 2010).In the period VI, when plastic support was returned to the aerobic biofilm chamber,the recirculation was turned on again. The positive effect of the plastic support wascounteracted by the products of partial hydrolysis of aerobic sludge that occurred in themethanogenic stage. That was the reason why cBPC concentration did not diminish. Aclear drop in permeability, decreasing from 400 to 50 L·m -2·h -1·bar -1 , took place during thefirst 20 days of period VI. Rapid permeability drops were also observed during periods I, IIIand also during period V (period without support).Table 5.2. Main results in the membrane filtration chamber during periods I-VI.PerioddayscBPC(mg·L -1 )MLVSS(g·L -1 )Flux(L·m -2·h -1 )Permeability(L·m -2·h -1·bar -1 )I* 0 - 175 39.7 ± 24.2 1.3 ± 0.7 13.3 ± 1.8 153 ± 68II 176 - 260 4.9 ± 4.2 3.3 ± 0.7 15.5 ± 2.0 189 ± 32III* 261 - 540 22.9 ± 20.7 2.6 ± 2.0 12.6 ± 2.6 169 ± 78IV 541 - 569 12.2 ± 6.7 4.0 ± 1.5 13.2 ± 1.3 229 ± 69V 570 - 635 31.3 ± 26.2 4.8 ± 2.0 14.5 ± 2.6 193 ± 70VI* 636 - 680 67.7 ± 18.9 2.7 ± 1.5 14.9 ± 1.9 285 ± 85* Chemical recovery cleaning that took place during this periodThe applied food to microorganism (F/M) ratio, or SRT might influence themembrane performance of the MBR. F/M referred to soluble COD, and applied to theaerobic and filtration stages was very low during the seven operational periods. The lowestvalues were observed during periods I and V (0.011 kgCOD·kgMLVSS -1·d -1 ) whereas the138
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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.,
Page 99 and 100: 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: Chapter 5operating with similar mem
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
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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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