selection pressure theory for aerobic granulation in sequencing batch reactors

... used only for identification and explanation without intent to infringe Library of Congress Cataloging -in- Publication Data Wastewater purification : aerobic granulation in sequencing batch reactors ... Wastewater Purification Aerobic Granulation in Sequencing Batch Reactors Edited by Yu Liu Boca Raton London New York CRC Press is an imprint of the Taylor & Francis Group, an informa business © 2008 by ... mechanism of aerobic granulation in sequencing batch reactor (SBR) and its application in treating a wide variety of municipal and industrial wastewater Obviously, the basic research of aerobic granulation...

Ngày tải lên: 18/06/2014, 16:20

... conditions present in the SBR As shear force has an important role in aerobic granulation and granule stability, a minimum shear force seems necessary for aerobic granulation It should be pointed out ... Technological University, Singapore With permission.) 2.2 AEROBIC GRANULATION AT DIFFERENT SHEAR FORCES In a column-type sequencing batch reactor (SBR) commonly employed for cultivation of aerobic granules, ... out that high shear force in terms of upflow air velocity required for aerobic granulation will certainly increase the energy consumption for an aerobic granular sludge reactor For example, if an...

Ngày tải lên: 18/06/2014, 16:20

... 2002 Improving anaerobic sequencing batch reactor performance by modifying operational parameters Water Res 36: 363–367 Tay, J H., Yang, S F., and Liu, Y 2002 Hydraulic selection pressure- induced ... would result in the lowest selection pressure As a result, no nitrifying granulation was observed in the SBR run at the cycle time of 24 hours In fact, the absence of anaerobic granulation was ... hydraulic selection pressure, in order to avoid being washed out from the system, the nitrifying community has to regulate its metabolic pathway so as to maintain a balance with the external pressure...

Ngày tải lên: 18/06/2014, 16:20

... Selection pressure is a driving force of aerobic granulation in sequencing batch reactors Process Biochem 39: 579–584 Schmidt, J E and Ahring, B K 1996 Granular sludge formation in upflow anaerobic ... Granulation at Different Settling Times 63 aerobic granulation In fact, absence of anaerobic granulation in the UASB reactors was observed at very weak hydraulic selection pressure in terms of liquid upflow ... available 10 minutes As shown in equation 4.3, the minimum settling velocity, (Vs)min can be estimated as 2.4 m h–1 for settling time of 10 minutes and 12 m h–1 for minutes (McSwain et al 2005)...

Ngày tải lên: 18/06/2014, 16:20

... IS A SELECTION PRESSURE FOR AEROBIC GRANULATION It appears from chapter that the settling time of SBR can serve as a selection pressure for aerobic granulation, for example, at a short settling ... slightly different selection pressures in terms of minimum settling velocity of 0.6 and 0.7 m h–1 Even such a marginal difference in the minimum settling velocity could also result in distinct morphologies ... sludge formation in upflow anaerobic sludge blanket (UASB) reactors Biotechnol Bioeng 49: 229–246 Wang, Z.-W 2007 Insights into the mechanism of aerobic granulation in sequencing batch reactor Ph.D...

Ngày tải lên: 18/06/2014, 16:20

... determine aerobic granulation in an SBR To develop a unified theory for aerobic granulation in SBRs, the role of discharge time in aerobic granulation should be taken into account seriously 6.5 MAIN ... aerobic granulation in sequencing batch reactors Process Biochem 39: 579–584 Qin, L., Liu, Y., and Tay, J H 2004b Effect of settling time on aerobic granulation in sequencing batch reactor Biochem ... shear force is a primary inducer of aerobic granulation in SBRs 6.4.3 FEAST-FAMINE REGIMEN An SBR is operated in a sequencing cycle of feeding, aeration, settling, and discharge of supernatant In...

Ngày tải lên: 18/06/2014, 16:20

... oxygen transfer in an aerobic granule-based sequencing batch reactor Biochem Eng J 25: 201–207 Su, K Z and Yu, H Q 2006 A generalized model for aerobic granule-based sequencing batch reactor I ... ratio on the formation of aerobic granules J Environ Eng 131: 86–92 Yang, S F., Liu, Q S., Tay, J H., and Liu, Y 2004 Growth kinetics of aerobic granules developed in sequencing batch reactors Lett ... highest substrate surface loading (24 g COD m–2) In fact, these are in good agreement with the Pirt maintenance theory, stating that more substrate will be used for maintenance purposes at lower...

Ngày tải lên: 18/06/2014, 16:20

... the increase in the size of aerobic granules, indicating that the microbial activity inside aerobic granules is inhibited as the granule size increases Moreover, the specific growth rate of aerobic ... the remaining depth in the aerobic granule is deficient in dissolved oxygen (DO) (figure 8.7c, d, and e) Zero DO depths inside the aerobic granules are in good agreement with those COD platforms ... Characterization and evaluation of aerobic granules in a sequencing batch reactor J Biotechnol 105: 71–82 Laspidou, C S 2003 Modeling heterogeneous biofilms including active biomass, inert biomass and extracellular...

Ngày tải lên: 18/06/2014, 16:20

... Tay, J H 2004 Selection pressure is a driving force of aerobic granulation in sequencing batch reactors Process Biochem 39: 579–584 Quarmby, J and Forster, C F 1995 An examination of the structure ... Hydrophobicity in Aerobic Granulation 161 aerobic granulation The hydraulic selection pressure seems to induce changes in cell surface hydrophobicity, and a strong selection pressure results in a more ... demonstrated that aerobic granulation is a process driven by selection pressure in SBRs Under strong selection pressures, only the good-settling and heavy sludge particles are retained in the reactor,...

Ngày tải lên: 18/06/2014, 16:20

... EPS in aerobic granulation Di Iaconi et al (2006) reported that the main component of EPS in aerobic granular biomass in a sequencing batch biofilter reactor was made of proteins, and proteinrich ... fill in the intercellular spaces in the microcolonies present in aerobic granules (Jiang, Tay and Tay 2002; McSwain et al 2005) It is most likely that EPS plays an important role in maintaining ... (VSS) in seed sludge to 51.4 and 5.9 mg g–1 VSS in aerobic granular sludge These results seem to imply that EPS are not involved in aerobic granulation in this special case, but the reason behind...

Ngày tải lên: 18/06/2014, 16:20

... indicating a limiting number of live bacteria in the core part of the aerobic granule Similar observation was also reported by Toh et al (2003) and McSwain et al.(2005) In the study by McSwain ... Fluorescence viewed on granule cross section by staining with ConA for alpha-linked PS (a); calcofluor white for beta-linked PS (b); and FITC for protein (c) Scale bar: 200 μm (From Chen, M Y., Lee, ... they were within the reach of mass diffusion, while dead cells and anaerobes were mainly detected at the core of the aerobic granule, indicating an uneven microbial distribution in aerobic granules...

Ngày tải lên: 18/06/2014, 16:20

... shell of the aerobic granule (chapter 11) In fact, Toh et al (2003) investigated the viability of microflora residing inside aerobic granules using in situ DNA fluorescence staining, in which membrane ... shell of aerobic granules remained nearly unchanged before and after starvation This reveals the functional role of nonbiodegradable EPS in constructing and maintaining the spatial structure, integrity, ... the EPS produced in the feast phase would be used in the famine phase in order for microorganisms to overcome the energy constraint EPS biodegradation in the course of aerobic granulation was...

Ngày tải lên: 18/06/2014, 16:20

... indicate that aerobic granulation may not depend on calcium ion, that is, calcium ion is not essential for aerobic granulation in SBRs Mahoney et al (1987) investigated anaerobic granulation in two ... calcium on aerobic granulation in sequencing batch reactors (SBRs) For this purpose, two SBRs were operated at the respective Ca2+ concentrations of zero and 100 mg L –1 It was found that aerobic ... evidence in figures 13.6, 13.7, and 13.9 point to the fact that calcium accumulation occurs only after aerobic granulation, and a crystal CaCO3 core is indeed not required for aerobic granulation In...

Ngày tải lên: 18/06/2014, 16:20

... governing factor in aerobic granulation in the SBR As shown in chapter 9, cell surface hydrophobicity plays a crucial role in the formation of biofilm and biogranules In a thermodynamic sense, increased ... exist in the present literature 14.3 INFLUENCE OF SHORT STARVATION ON AEROBIC GRANULES To offer in- depth insights into the role of starvation in aerobic granulation, Z.-W Wang et al (2006) investigated ... STARVATION ON AEROBIC GRANULATION Q.-S Liu (2003) investigated the role of periodic starvation in aerobic granulation, and concluded that it has a positive effect on aerobic granulation in SBRs, as...

Ngày tải lên: 18/06/2014, 16:20

... polymeric substances on aerobic granulation in sequencing batch reactors Chemosphere 63: 1728–1735 Wang, Z.-W 2007 Insights into mechanism of aerobic granulation in a sequencing batch reactor Ph.D ... OF AEROBIC FEEDING Aerobic granules are often cultivated in SBRs with a very short fill or feeding time McSwain, Irvine, and Wilderer (2004) investigated the effect of intermittent feeding on aerobic ... 2003 Aerobic granulation in sequencing batch reactor Ph.D thesis, Nanyang Technological University, Singapore Liu, Y and Tay, J H 2002 The essential role of hydrodynamic shear force in the formation...

Ngày tải lên: 18/06/2014, 16:20

... 2004 Selection of slow growing organisms as a means for improving aerobic granular sludge stability Water Sci Technol 49: 9–17 Inizan, M., Freval, A., Cigana, J., and Meinhold, J 2005 Aerobic granulation ... stability of aerobic granules by selecting slow-growing nitrifying bacteria J Biotechnol 108: 161–169 Liu, Y Q and Tay, J H 2006 Variable aeration in sequencing batch reactor with aerobic granular ... of the nitrifying population over the heterotrophic population in aerobic granules This suggests that the enriched nitrifying population in aerobic granules is mainly responsible for the lowered...

Ngày tải lên: 18/06/2014, 16:20

... PILOT-SCALE AEROBIC GRANULAR SLUDGE SBRS J H Tay et al (2004) investigated aerobic granulation in a pilot-scale SBR The pilot-scale aerobic granular sludge SBR was initiated by seeding mature aerobic ... CONCLUSIONS Aerobic granulation in pilot-scale SBRs is an important step for its full application in the industrial-scale plant Aerobic granular sludge SBRs can be initiated by seeding either ... A 1997 Aerobic granular sludge in a sequencing batch reactor Water Res 31: 3191–3194 Tay, J H., Liu, Q.-S., and Liu, Y 2001 Microscopic observation of aerobic granulation in sequential aerobic...

Ngày tải lên: 18/06/2014, 16:20

... Biotransformation of erythromycin by acclimated microorganisms in sequencing batch reactors (SBRs) Singapore International Water Week 2011 Singapore (accepted for presentation) xvii Chapter Introduction ... 2008 Influences of erythromycin and erythromycin-H2O on aerobic sequencing batch reactor (SBR) American Society for Microbiology’s 108th General Meeting Boston, Massachusetts, USA (accepted for ... Andersen, G.L., He, J., 2009 Influence of trace erythromycin and erythromycin-H2O on carbon and nutrients removal and on resistance selection in sequencing batch reactors (SBRs) Applied Microbiology...

Ngày tải lên: 10/09/2015, 15:51

... mappings, Rocky Mountain J Math (1974), 69–79 N Gheorghiu, Contraction theorem in uniform spaces, Stud Cerc Mat 19 (1967), 119–122 (Romanian) , Fixed point theorems in uniform spaces, An Stiint ... fixed point theorem of Maia type in syntopogenous spaces, Seminar on Fixed Point Theory, Preprint, vol 88, Univ “Babes-Bolyai”, Cluj-Napoca, 1988, pp 49–70 ¸ , Discrete continuation method for boundary ... 1927 (2001), 367–373 , Continuation results for mappings of contractive type, Semin Fixed Point Theory ClujNapoca (2001), 23–40 , Methods in Nonlinear Integral Equations, Kluwer Academic Publishers,...

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