Effect of extended idle conditions on structure and activity of granular activated sludge
Identifieur interne : 001797 ( Main/Exploration ); précédent : 001796; suivant : 001798Effect of extended idle conditions on structure and activity of granular activated sludge
Auteurs : JIANRONG ZHU [République populaire de Chine] ; Peter A. Wilderer [Allemagne]Source :
- Water research : (Oxford) [ 0043-1354 ] ; 2003.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
In industry and in tourist areas, periods exist during which no or only very little sewage is produced, and the wastewater treatment facilities have to be set into an idle phase over several days and even weeks. When wastewater is generated again and delivered to the treatment plant, the microorganisms in the activated sludge plant may have lost activity, and the activated sludge flocs may have disintegrated. From previous observation, it is assumed that granular activated sludge is more resistant against long-term storage than activated sludge flocs. Experiments using a laboratory-scale sequencing batch reactor (SBR) were conducted to study the impacts of a 7-weeks anaerobic idle time on structural integrity and metabolic activity of granular activated sludge, and the time required to regain the former operational status of the plant. Oxygen consumption rate (OCR) was used as an indicator to evaluate the metabolic activity of the sludge. The results revealed that the size, color and sedimentation characteristics of the granular sludge did hardly change during the storage period. Sludge activity, however, dropped to values as low as 0.17 mg min-1 L- 1. After restarting the reactor, the OCR increased within 1 day to a level of 0.57 mg min 1L ,kept rising at a linear rate in the following days, and reached after 1week, a value of 5.74 mg min-1L -1typical for the former activity status. These results imply that granular activated sludge can be stored for a considerably long period of time, and brought into service again relatively quickly. After an idle period of 7 weeks, it took less than a week to regain full capacity of the SBR.
Affiliations:
- Allemagne, République populaire de Chine
- Bavière, District de Haute-Bavière
- Munich, Pékin
- Université Louis-et-Maximilien de Munich
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Le document en format XML
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Wilderer</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Institute of Water Quality Control & Waste Management, Technical University of Munich, Am Coulombwall</s1><s2>85748 Garching</s2><s3>DEU</s3><sZ>2 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>85748 Garching</wicri:noRegion><wicri:noRegion>Am Coulombwall</wicri:noRegion><wicri:noRegion>85748 Garching</wicri:noRegion><orgName type="university">Université Louis-et-Maximilien de Munich</orgName><placeName><settlement type="city">Munich</settlement><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">03-0255092</idno><date when="2003">2003</date><idno type="stanalyst">PASCAL 03-0255092 INIST</idno><idno type="RBID">Pascal:03-0255092</idno><idno type="wicri:Area/PascalFrancis/Corpus">000614</idno><idno type="wicri:Area/PascalFrancis/Curation">000177</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000561</idno><idno type="wicri:doubleKey">0043-1354:2003:Jianrong Zhu:effect:of:extended</idno><idno type="wicri:Area/Main/Merge">001875</idno><idno type="wicri:Area/Main/Curation">001797</idno><idno type="wicri:Area/Main/Exploration">001797</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Effect of extended idle conditions on structure and activity of granular activated sludge</title><author><name sortKey="Jianrong Zhu" sort="Jianrong Zhu" uniqKey="Jianrong Zhu" last="Jianrong Zhu">JIANRONG ZHU</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Environmental Engineering, Tsinghua University</s1><s2>Beijing 100084</s2><s3>CHN</s3><sZ>1 aut.</sZ></inist:fA14><country>République populaire de Chine</country><placeName><settlement type="city">Pékin</settlement></placeName></affiliation></author><author><name sortKey="Wilderer, Peter A" sort="Wilderer, Peter A" uniqKey="Wilderer P" first="Peter A." last="Wilderer">Peter A. Wilderer</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Institute of Water Quality Control & Waste Management, Technical University of Munich, Am Coulombwall</s1><s2>85748 Garching</s2><s3>DEU</s3><sZ>2 aut.</sZ></inist:fA14><country>Allemagne</country><wicri:noRegion>85748 Garching</wicri:noRegion><wicri:noRegion>Am Coulombwall</wicri:noRegion><wicri:noRegion>85748 Garching</wicri:noRegion><orgName type="university">Université Louis-et-Maximilien de Munich</orgName><placeName><settlement type="city">Munich</settlement><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Water research : (Oxford)</title><title level="j" type="abbreviated">Water res. : (Oxf.)</title><idno type="ISSN">0043-1354</idno><imprint><date when="2003">2003</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Water research : (Oxford)</title><title level="j" type="abbreviated">Water res. : (Oxf.)</title><idno type="ISSN">0043-1354</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Activated sludge</term><term>Biological purification</term><term>Bioreactor</term><term>Chemical oxygen demand</term><term>Experimental study</term><term>Granular structure</term><term>Oxygen consumption</term><term>Sequencing batch reactor</term><term>Slowing down</term><term>Waste water purification</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Epuration eau usée</term><term>Epuration biologique</term><term>Boue activée</term><term>Ralentissement</term><term>Consommation oxygène</term><term>Bioréacteur</term><term>Réacteur SBR</term><term>DCO</term><term>Structure granulaire</term><term>Etude expérimentale</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In industry and in tourist areas, periods exist during which no or only very little sewage is produced, and the wastewater treatment facilities have to be set into an idle phase over several days and even weeks. When wastewater is generated again and delivered to the treatment plant, the microorganisms in the activated sludge plant may have lost activity, and the activated sludge flocs may have disintegrated. From previous observation, it is assumed that granular activated sludge is more resistant against long-term storage than activated sludge flocs. Experiments using a laboratory-scale sequencing batch reactor (SBR) were conducted to study the impacts of a 7-weeks anaerobic idle time on structural integrity and metabolic activity of granular activated sludge, and the time required to regain the former operational status of the plant. Oxygen consumption rate (OCR) was used as an indicator to evaluate the metabolic activity of the sludge. The results revealed that the size, color and sedimentation characteristics of the granular sludge did hardly change during the storage period. Sludge activity, however, dropped to values as low as 0.17 mg min<sup>-1</sup> L<sup>-</sup> <sup>1</sup>. After restarting the reactor, the OCR increased within 1 day to a level of 0.57 mg min <sup>1</sup>L ,kept rising at a linear rate in the following days, and reached after 1week, a value of 5.74 mg min<sup>-1</sup>L <sup>-1</sup>typical for the former activity status. These results imply that granular activated sludge can be stored for a considerably long period of time, and brought into service again relatively quickly. After an idle period of 7 weeks, it took less than a week to regain full capacity of the SBR.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>République populaire de Chine</li></country><region><li>Bavière</li><li>District de Haute-Bavière</li></region><settlement><li>Munich</li><li>Pékin</li></settlement><orgName><li>Université Louis-et-Maximilien de Munich</li></orgName></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Jianrong Zhu" sort="Jianrong Zhu" uniqKey="Jianrong Zhu" last="Jianrong Zhu">JIANRONG ZHU</name></noRegion></country><country name="Allemagne"><region name="Bavière"><name sortKey="Wilderer, Peter A" sort="Wilderer, Peter A" uniqKey="Wilderer P" first="Peter A." last="Wilderer">Peter A. Wilderer</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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