Effects of increase modes of shear force on granule disruption in upflow anaerobic reactors
Identifieur interne : 000777 ( Main/Curation ); précédent : 000776; suivant : 000778Effects of increase modes of shear force on granule disruption in upflow anaerobic reactors
Auteurs : Jing Wu [République populaire de Chine] ; Jin-Bai Zhang [France] ; Souhila Poncin [France] ; Zhi P. Cao [République populaire de Chine] ; Huai-Zhi Li [France]Source :
- Water Research [ 0043-1354 ] ; 2012-06-15.
English descriptors
- mix :
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.
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DOI: 10.1016/j.watres.2012.03.042
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Cao</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-212084" status="INCOMING"><orgName>State Key Joint Lab Environm Simulat & Pollut Con,</orgName><desc><address><addrLine>Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084</addrLine><country key="CN"></country></address></desc><listRelation><relation active="#struct-24050" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-24050" type="direct"><org type="institution" xml:id="struct-24050" status="VALID"><orgName>Tsinghua University [Beijing]</orgName><desc><address><addrLine>Beijing,100084,P.R.</addrLine><country key="CN"></country></address><ref type="url">http://www.tsinghua.edu.cn/publish/then/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>République populaire de Chine</country></affiliation></author><author><name sortKey="Li, Huai Zhi" sort="Li, Huai Zhi" uniqKey="Li H" first="Huai-Zhi" last="Li">Huai-Zhi Li</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-211875" status="VALID"><idno type="IdRef">153068876</idno><idno type="RNSR">201320573K</idno><idno type="IdUnivLorraine">[UL]RQC--</idno><orgName>Laboratoire Réactions et Génie des Procédés</orgName><orgName type="acronym">LRGP</orgName><date type="start">2013-01-01</date><desc><address><addrLine>Université de Lorraine - ENSIC, 1 rue de Grandville BP 20451, 54001 Nancy Cedex</addrLine><country key="FR"></country></address><ref type="url">http://lrgp.univ-lorraine.fr/</ref></desc><listRelation><relation active="#struct-413289" type="direct"></relation><relation name="UMR7274" active="#struct-441569" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-413289" type="direct"><org type="institution" xml:id="struct-413289" status="VALID"><idno type="IdRef">157040569</idno><idno type="IdUnivLorraine">[UL]100--</idno><orgName>Université de Lorraine</orgName><orgName type="acronym">UL</orgName><date type="start">2012-01-01</date><desc><address><addrLine>34 cours Léopold - CS 25233 - 54052 Nancy cedex</addrLine><country key="FR"></country></address><ref type="url">http://www.univ-lorraine.fr/</ref></desc></org></tutelle><tutelle name="UMR7274" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno><idno type="IdRef">02636817X</idno><orgName>Centre National de la Recherche Scientifique</orgName><orgName type="acronym">CNRS</orgName><date type="start">1939-10-19</date><desc><address><country key="FR"></country></address><ref type="url">http://www.cnrs.fr/</ref></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Nancy</settlement><settlement type="city">Metz</settlement><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region></placeName><orgName type="university">Université de Lorraine</orgName></affiliation></author></analytic><idno type="DOI">10.1016/j.watres.2012.03.042</idno><series><title level="j">Water Research</title><idno type="ISSN">0043-1354</idno><imprint><date type="datePub">2012-06-15</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>BIOFILM</term><term>Disruption</term><term>EXTRACELLULAR POLYMERS</term><term>EXTRACTION</term><term>Granule</term><term>SEWAGE</term><term>SLUDGE</term><term>Shear force</term><term>Sludge washout</term><term>UASB</term><term>Upflow anaerobic reactor</term><term>WASTE</term></keywords></textClass></profileDesc></teiHeader><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></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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