Compression and swelling of activated sludge cakes during dewatering
A drainage/filtration apparatus was developed for automatically determining sedimentation velocity and dewatering rate. Pressure-step testing was used to study filter cake compressibility, resistance, and swelling. Activated sludge was analysed, and the data indicate that the sludge is highly compre...
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| Veröffentlicht in: | Water research (Oxford) 2012-10, Vol.46 (16), p.4999-5008 |
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| creator | Sveegaard, Steffen Gralert Keiding, Kristian Christensen, Morten Lykkegaard |
| description | A drainage/filtration apparatus was developed for automatically determining sedimentation velocity and dewatering rate. Pressure-step testing was used to study filter cake compressibility, resistance, and swelling. Activated sludge was analysed, and the data indicate that the sludge is highly compressible even at low pressures (10 kPa). Furthermore, compressed sludge cakes swell if the pressure is released. Hence, the average specific cake resistance decreases if the pressure is released, though the resistance is higher after the compression cycle than before. Sludge must be dewatered under low pressure, because higher pressure only compresses the cake and does not improve the dewatering rate.
► An apparatus has been developed for rapidly determining sedimentation velocity and resistances. ► Pressure-step testing method has been used to study cake compression and swelling. ► Activated sludge cakes swells partly i.e. the resistance decreases with decreasing pressure. |
| doi_str_mv | 10.1016/j.watres.2012.06.039 |
| format | Article |
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► An apparatus has been developed for rapidly determining sedimentation velocity and resistances. ► Pressure-step testing method has been used to study cake compression and swelling. ► Activated sludge cakes swells partly i.e. the resistance decreases with decreasing pressure.</description><identifier>ISSN: 0043-1354</identifier><identifier>EISSN: 1879-2448</identifier><identifier>DOI: 10.1016/j.watres.2012.06.039</identifier><identifier>PMID: 22819870</identifier><identifier>CODEN: WATRAG</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Activated sludge ; Applied sciences ; Cakes ; compressibility ; Compressing ; Desiccation - methods ; Dewatering ; Dewatering (separation process) ; Drainage ; Exact sciences and technology ; filter cake ; Filtration ; Filtration - instrumentation ; Filtration - methods ; Fluorescein ; Low pressure ; Pollution ; Pressure ; Resistance ; Sedimentation ; Sewage - chemistry ; Sludge ; Swelling ; Vacuum ; Waste Disposal, Fluid - instrumentation ; Waste Disposal, Fluid - methods ; Wastewater ; Water - chemistry ; Water treatment and pollution</subject><ispartof>Water research (Oxford), 2012-10, Vol.46 (16), p.4999-5008</ispartof><rights>2012 Elsevier Ltd</rights><rights>2015 INIST-CNRS</rights><rights>Copyright © 2012 Elsevier Ltd. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c449t-52868b8d7f10432e84af1ce29e3f0f07f2dfbab75f6aaf3ebd673fe989a0e7883</citedby><cites>FETCH-LOGICAL-c449t-52868b8d7f10432e84af1ce29e3f0f07f2dfbab75f6aaf3ebd673fe989a0e7883</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.watres.2012.06.039$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=26337029$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/22819870$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Sveegaard, Steffen Gralert</creatorcontrib><creatorcontrib>Keiding, Kristian</creatorcontrib><creatorcontrib>Christensen, Morten Lykkegaard</creatorcontrib><title>Compression and swelling of activated sludge cakes during dewatering</title><title>Water research (Oxford)</title><addtitle>Water Res</addtitle><description>A drainage/filtration apparatus was developed for automatically determining sedimentation velocity and dewatering rate. Pressure-step testing was used to study filter cake compressibility, resistance, and swelling. Activated sludge was analysed, and the data indicate that the sludge is highly compressible even at low pressures (10 kPa). Furthermore, compressed sludge cakes swell if the pressure is released. Hence, the average specific cake resistance decreases if the pressure is released, though the resistance is higher after the compression cycle than before. Sludge must be dewatered under low pressure, because higher pressure only compresses the cake and does not improve the dewatering rate.
► An apparatus has been developed for rapidly determining sedimentation velocity and resistances. ► Pressure-step testing method has been used to study cake compression and swelling. ► Activated sludge cakes swells partly i.e. the resistance decreases with decreasing pressure.</description><subject>Activated sludge</subject><subject>Applied sciences</subject><subject>Cakes</subject><subject>compressibility</subject><subject>Compressing</subject><subject>Desiccation - methods</subject><subject>Dewatering</subject><subject>Dewatering (separation process)</subject><subject>Drainage</subject><subject>Exact sciences and technology</subject><subject>filter cake</subject><subject>Filtration</subject><subject>Filtration - instrumentation</subject><subject>Filtration - methods</subject><subject>Fluorescein</subject><subject>Low pressure</subject><subject>Pollution</subject><subject>Pressure</subject><subject>Resistance</subject><subject>Sedimentation</subject><subject>Sewage - chemistry</subject><subject>Sludge</subject><subject>Swelling</subject><subject>Vacuum</subject><subject>Waste Disposal, Fluid - instrumentation</subject><subject>Waste Disposal, Fluid - methods</subject><subject>Wastewater</subject><subject>Water - chemistry</subject><subject>Water treatment and pollution</subject><issn>0043-1354</issn><issn>1879-2448</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkUtv1DAUhS1ERaeFf4AgG6RuEq4fSewNEhpelSqxgK4tx74eecgkg5206r_HIQPsKlbXuvrOuUfHhLykUFGgzdt9dW-miKliQFkFTQVcPSEbKltVMiHkU7IBELykvBbn5CKlPQAwxtUzcs6YpEq2sCEftuPhmF1SGIfCDK5I99j3YdgVoy-MncKdmTBv-9ntsLDmB6bCzXEBHOYAuDyfkzNv-oQvTvOS3H76-H37pbz5-vl6-_6mtEKoqayZbGQnXetpDsZQCuOpRaaQe_DQeuZ8Z7q29o0xnmPnmpZ7VFIZwFZKfkmuVt9jHH_OmCZ9CMnmvGbAcU6aQqOoqoGL_0C5AgGZzahYURvHlCJ6fYzhYOJDhvRStd7rtWq9VK2h0VmcZa9OF-bugO6v6E-3GXhzAkyypvfRDDakf1zDeQtsMXq9ct6M2uxiZm6_5Ut1_i9Q9HfCdyuBudy7gFEnG3Cw6EJEO2k3hsez_gK7vKep</recordid><startdate>20121015</startdate><enddate>20121015</enddate><creator>Sveegaard, Steffen Gralert</creator><creator>Keiding, Kristian</creator><creator>Christensen, Morten Lykkegaard</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>FBQ</scope><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>8FD</scope><scope>FR3</scope><scope>KR7</scope></search><sort><creationdate>20121015</creationdate><title>Compression and swelling of activated sludge cakes during dewatering</title><author>Sveegaard, Steffen Gralert ; Keiding, Kristian ; Christensen, Morten Lykkegaard</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c449t-52868b8d7f10432e84af1ce29e3f0f07f2dfbab75f6aaf3ebd673fe989a0e7883</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Activated sludge</topic><topic>Applied sciences</topic><topic>Cakes</topic><topic>compressibility</topic><topic>Compressing</topic><topic>Desiccation - methods</topic><topic>Dewatering</topic><topic>Dewatering (separation process)</topic><topic>Drainage</topic><topic>Exact sciences and technology</topic><topic>filter cake</topic><topic>Filtration</topic><topic>Filtration - instrumentation</topic><topic>Filtration - methods</topic><topic>Fluorescein</topic><topic>Low pressure</topic><topic>Pollution</topic><topic>Pressure</topic><topic>Resistance</topic><topic>Sedimentation</topic><topic>Sewage - chemistry</topic><topic>Sludge</topic><topic>Swelling</topic><topic>Vacuum</topic><topic>Waste Disposal, Fluid - instrumentation</topic><topic>Waste Disposal, Fluid - methods</topic><topic>Wastewater</topic><topic>Water - chemistry</topic><topic>Water treatment and pollution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sveegaard, Steffen Gralert</creatorcontrib><creatorcontrib>Keiding, Kristian</creatorcontrib><creatorcontrib>Christensen, Morten Lykkegaard</creatorcontrib><collection>AGRIS</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Water research (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sveegaard, Steffen Gralert</au><au>Keiding, Kristian</au><au>Christensen, Morten Lykkegaard</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Compression and swelling of activated sludge cakes during dewatering</atitle><jtitle>Water research (Oxford)</jtitle><addtitle>Water Res</addtitle><date>2012-10-15</date><risdate>2012</risdate><volume>46</volume><issue>16</issue><spage>4999</spage><epage>5008</epage><pages>4999-5008</pages><issn>0043-1354</issn><eissn>1879-2448</eissn><coden>WATRAG</coden><abstract>A drainage/filtration apparatus was developed for automatically determining sedimentation velocity and dewatering rate. Pressure-step testing was used to study filter cake compressibility, resistance, and swelling. Activated sludge was analysed, and the data indicate that the sludge is highly compressible even at low pressures (10 kPa). Furthermore, compressed sludge cakes swell if the pressure is released. Hence, the average specific cake resistance decreases if the pressure is released, though the resistance is higher after the compression cycle than before. Sludge must be dewatered under low pressure, because higher pressure only compresses the cake and does not improve the dewatering rate.
► An apparatus has been developed for rapidly determining sedimentation velocity and resistances. ► Pressure-step testing method has been used to study cake compression and swelling. ► Activated sludge cakes swells partly i.e. the resistance decreases with decreasing pressure.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><pmid>22819870</pmid><doi>10.1016/j.watres.2012.06.039</doi><tpages>10</tpages></addata></record> |
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| ispartof | Water research (Oxford), 2012-10, Vol.46 (16), p.4999-5008 |
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| source | MEDLINE; ScienceDirect Journals (5 years ago - present) |
| subjects | Activated sludge Applied sciences Cakes compressibility Compressing Desiccation - methods Dewatering Dewatering (separation process) Drainage Exact sciences and technology filter cake Filtration Filtration - instrumentation Filtration - methods Fluorescein Low pressure Pollution Pressure Resistance Sedimentation Sewage - chemistry Sludge Swelling Vacuum Waste Disposal, Fluid - instrumentation Waste Disposal, Fluid - methods Wastewater Water - chemistry Water treatment and pollution |
| title | Compression and swelling of activated sludge cakes during dewatering |
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