LrgpV1, Hal, Corpus, bibRecord, 000398

Effects of increase modes of shear force on granule disruption in upflow anaerobic reactors

Identifieur interne : 000398 ( Hal/Corpus ); précédent : 000397; suivant : 000399

Effects of increase modes of shear force on granule disruption in upflow anaerobic reactors

Auteurs : Jing Wu ; Jin-Bai Zhang ; Souhila Poncin ; Zhi P. Cao ; Huai-Zhi Li

Source :

Water Research [ 0043-1354 ] ; 2012-06-15.

RBID : Hal:hal-00778218

English descriptors

mix :
- BIOFILM, Disruption, EXTRACELLULAR POLYMERS, EXTRACTION, Granule, SEWAGE, SLUDGE, Shear force, Sludge washout, UASB, Upflow anaerobic reactor, WASTE.

Abstract

Sludge washout is listed among the top practical problems of the high rate upflow anaerobic reactors. This study investigated quantitatively two sludge washout processes operated under different hydrodynamic shear increase modes with the intervals of 1 and 10 days respectively. The results reveal that the sludge washout accompanying with large-scale granule disruption could lead to performance failure with heavy sludge loss ratio of about 46.1% at sludge loss rate about 0.35 gVSS L-1 d(-1) during the process with shear increase interval of 1 day, while the highest sludge loss rate was only 0.12 gVSS L-1 d(-1) during the process with 10-day interval. The intensified shear conditions could weaken the granules through inhibiting the extracellular polymers production and bioactivity. As consequences, an outbreak of large-scale granule disruption would raise and then significantly accelerate the sludge washout. Since long interval could provide the granules the opportunity to recover from these negative effects to some extent, the shear increase strategy of long interval over 10 days is favorably recommended to operate full-scale reactors during the start-up and shock load periods. The pioneer use of the micro particle image velocimetry in this study offers the possibility to discover the real hydrodynamic conditions around granules at microscale for the first time and reveals that the shear force exerts directly on the granular surface as a mechanical disruption force and big granules undergo high disruption force. The granule disruption is a result of the competition between the granule and the ambient hydrodynamic shear conditions rather than a process with shear force as a sole dominant factor. These could facilitate the understanding of the complicated interactions between the hydrodynamics and reactor performance and favor then a better control of the full-scale reactors.

Url:

https://hal.archives-ouvertes.fr/hal-00778218

DOI: 10.1016/j.watres.2012.03.042

Links to Exploration step

Hal:hal-00778218

Le document en format XML

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<term>SLUDGE</term>
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<front><div type="abstract" xml:lang="en">Sludge washout is listed among the top practical problems of the high rate upflow anaerobic reactors. This study investigated quantitatively two sludge washout processes operated under different hydrodynamic shear increase modes with the intervals of 1 and 10 days respectively. The results reveal that the sludge washout accompanying with large-scale granule disruption could lead to performance failure with heavy sludge loss ratio of about 46.1% at sludge loss rate about 0.35 gVSS L-1 d(-1) during the process with shear increase interval of 1 day, while the highest sludge loss rate was only 0.12 gVSS L-1 d(-1) during the process with 10-day interval. The intensified shear conditions could weaken the granules through inhibiting the extracellular polymers production and bioactivity. As consequences, an outbreak of large-scale granule disruption would raise and then significantly accelerate the sludge washout. Since long interval could provide the granules the opportunity to recover from these negative effects to some extent, the shear increase strategy of long interval over 10 days is favorably recommended to operate full-scale reactors during the start-up and shock load periods. The pioneer use of the micro particle image velocimetry in this study offers the possibility to discover the real hydrodynamic conditions around granules at microscale for the first time and reveals that the shear force exerts directly on the granular surface as a mechanical disruption force and big granules undergo high disruption force. The granule disruption is a result of the competition between the granule and the ambient hydrodynamic shear conditions rather than a process with shear force as a sole dominant factor. These could facilitate the understanding of the complicated interactions between the hydrodynamics and reactor performance and favor then a better control of the full-scale reactors.</div>
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<funder>atural Science Foundation of China 51061130555 50978147 Agence de l'Environnement et de la Maitrise de l'Energie (ADEME)</funder>
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<editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2013-01-18 22:44:21</date>
<date type="whenWritten">2011</date>
<date type="whenModified">2016-05-10 16:53:05</date>
<date type="whenReleased">2013-01-18 22:44:21</date>
<date type="whenProduced">2012-06-15</date>
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<name key="179637"><persName><forename>Gabriel</forename>
<surname>Wild</surname>
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<email>gabriel.wild@univ-lorraine.fr</email>
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<idno type="halRefHtml">Water Research, IWA Publishing, 2012, 46 (10), pp.3189-3196. <10.1016/j.watres.2012.03.042></idno>
<idno type="halRef">Water Research, IWA Publishing, 2012, 46 (10), pp.3189-3196. <10.1016/j.watres.2012.03.042></idno>
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<idno type="stamp" n="UNIV-LORRAINE">Université de Lorraine</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">Effects of increase modes of shear force on granule disruption in upflow anaerobic reactors</title>
<author role="crp"><persName><forename type="first">Jing</forename>
<surname>Wu</surname>
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<email>wu_jing@tsinghua.edu.cn</email>
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<author role="aut"><persName><forename type="first">Jin-Bai</forename>
<surname>Zhang</surname>
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<author role="aut"><persName><forename type="first">Souhila</forename>
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<author role="aut"><persName><forename type="first">Zhi P.</forename>
<surname>Cao</surname>
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<idno type="halAuthorId">807478</idno>
<affiliation ref="#struct-212084"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Huai-Zhi</forename>
<surname>Li</surname>
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<email>huai-zhi.li@univ-lorraine.fr</email>
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<monogr><idno type="halJournalId" status="VALID">9239</idno>
<idno type="issn">0043-1354</idno>
<title level="j">Water Research</title>
<imprint><publisher>IWA Publishing</publisher>
<biblScope unit="volume">46</biblScope>
<biblScope unit="issue">10</biblScope>
<biblScope unit="pp">3189-3196</biblScope>
<date type="datePub">2012-06-15</date>
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<idno type="doi">10.1016/j.watres.2012.03.042</idno>
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<profileDesc><langUsage><language ident="en">English</language>
</langUsage>
<textClass><keywords scheme="author"><term xml:lang="en">Disruption</term>
<term xml:lang="en">Granule</term>
<term xml:lang="en">Sludge washout</term>
<term xml:lang="en">Shear force</term>
<term xml:lang="en">Upflow anaerobic reactor</term>
<term xml:lang="en">EXTRACELLULAR POLYMERS</term>
<term xml:lang="en">SLUDGE</term>
<term xml:lang="en">UASB</term>
<term xml:lang="en">EXTRACTION</term>
<term xml:lang="en">BIOFILM</term>
<term xml:lang="en">SEWAGE</term>
<term xml:lang="en">WASTE</term>
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<classCode scheme="halDomain" n="spi.gproc">Engineering Sciences [physics]/Chemical and Process Engineering</classCode>
<classCode scheme="halTypology" n="ART">Journal articles</classCode>
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<abstract xml:lang="en">Sludge washout is listed among the top practical problems of the high rate upflow anaerobic reactors. This study investigated quantitatively two sludge washout processes operated under different hydrodynamic shear increase modes with the intervals of 1 and 10 days respectively. The results reveal that the sludge washout accompanying with large-scale granule disruption could lead to performance failure with heavy sludge loss ratio of about 46.1% at sludge loss rate about 0.35 gVSS L-1 d(-1) during the process with shear increase interval of 1 day, while the highest sludge loss rate was only 0.12 gVSS L-1 d(-1) during the process with 10-day interval. The intensified shear conditions could weaken the granules through inhibiting the extracellular polymers production and bioactivity. As consequences, an outbreak of large-scale granule disruption would raise and then significantly accelerate the sludge washout. Since long interval could provide the granules the opportunity to recover from these negative effects to some extent, the shear increase strategy of long interval over 10 days is favorably recommended to operate full-scale reactors during the start-up and shock load periods. The pioneer use of the micro particle image velocimetry in this study offers the possibility to discover the real hydrodynamic conditions around granules at microscale for the first time and reveals that the shear force exerts directly on the granular surface as a mechanical disruption force and big granules undergo high disruption force. The granule disruption is a result of the competition between the granule and the ambient hydrodynamic shear conditions rather than a process with shear force as a sole dominant factor. These could facilitate the understanding of the complicated interactions between the hydrodynamics and reactor performance and favor then a better control of the full-scale reactors.</abstract>
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Effects of increase modes of shear force on granule disruption in upflow anaerobic reactors

Effects of increase modes of shear force on granule disruption in upflow anaerobic reactors

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