Activated sludge flocculation: on-line determination of floc size and the effect of shear
This paper presents a technique which enables on-line monitoring of activated sludge flocculation. The usefulness of this technique is demonstrated by investigating the effect of shear on steady-state floc sizes. The technique is based on a method developed to investigate flocculation of inorganic p...
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| Veröffentlicht in: | Water research (Oxford) 2000-06, Vol.34 (9), p.2542-2550 |
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| creator | Biggs, C.A Lant, P.A |
| description | This paper presents a technique which enables on-line monitoring of activated sludge flocculation. The usefulness of this technique is demonstrated by investigating the effect of shear on steady-state floc sizes. The technique is based on a method developed to investigate flocculation of inorganic particles. Samples of activated sludge are sonicated for 3 min at 50 W to produce the necessary primary particles to observe flocculation. The samples are then stirred in a batch mixing vessel and sized on-line using a Malvern Mastersizer/E.
The dynamics of flocculation were found to be reproducible and follow the principles of inorganic shear induced flocculation. The median floc size was found to increase until an equilibrium between the rates of aggregation and breakage was reached. At this point, a steady-state floc size was maintained.
The effect of shear on the steady-state floc size was quantified using the experimental technique. The change in floc size with shear followed a power law relationship. This relationship was used to investigate the breakage mechanisms. |
| doi_str_mv | 10.1016/S0043-1354(99)00431-5 |
| format | Article |
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The dynamics of flocculation were found to be reproducible and follow the principles of inorganic shear induced flocculation. The median floc size was found to increase until an equilibrium between the rates of aggregation and breakage was reached. At this point, a steady-state floc size was maintained.
The effect of shear on the steady-state floc size was quantified using the experimental technique. The change in floc size with shear followed a power law relationship. This relationship was used to investigate the breakage mechanisms.</description><identifier>ISSN: 0043-1354</identifier><identifier>EISSN: 1879-2448</identifier><identifier>DOI: 10.1016/S0043-1354(99)00431-5</identifier><identifier>CODEN: WATRAG</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Applied sciences ; Biological and medical sciences ; Biological treatment of waters ; Biotechnology ; Environment and pollution ; Exact sciences and technology ; floc size ; flocculation ; Fundamental and applied biological sciences. Psychology ; General purification processes ; Industrial applications and implications. Economical aspects ; Pollution ; shear ; sonication ; Wastewaters ; Water treatment and pollution</subject><ispartof>Water research (Oxford), 2000-06, Vol.34 (9), p.2542-2550</ispartof><rights>2000 Elsevier Science Ltd</rights><rights>2000 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c433t-b7e647de61782eb699e3711dcc0b7c41328261c78ff1a2d552371b602d6c98483</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0043135499004315$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=1386378$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Biggs, C.A</creatorcontrib><creatorcontrib>Lant, P.A</creatorcontrib><title>Activated sludge flocculation: on-line determination of floc size and the effect of shear</title><title>Water research (Oxford)</title><description>This paper presents a technique which enables on-line monitoring of activated sludge flocculation. The usefulness of this technique is demonstrated by investigating the effect of shear on steady-state floc sizes. The technique is based on a method developed to investigate flocculation of inorganic particles. Samples of activated sludge are sonicated for 3 min at 50 W to produce the necessary primary particles to observe flocculation. The samples are then stirred in a batch mixing vessel and sized on-line using a Malvern Mastersizer/E.
The dynamics of flocculation were found to be reproducible and follow the principles of inorganic shear induced flocculation. The median floc size was found to increase until an equilibrium between the rates of aggregation and breakage was reached. At this point, a steady-state floc size was maintained.
The effect of shear on the steady-state floc size was quantified using the experimental technique. The change in floc size with shear followed a power law relationship. This relationship was used to investigate the breakage mechanisms.</description><subject>Applied sciences</subject><subject>Biological and medical sciences</subject><subject>Biological treatment of waters</subject><subject>Biotechnology</subject><subject>Environment and pollution</subject><subject>Exact sciences and technology</subject><subject>floc size</subject><subject>flocculation</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>General purification processes</subject><subject>Industrial applications and implications. Economical aspects</subject><subject>Pollution</subject><subject>shear</subject><subject>sonication</subject><subject>Wastewaters</subject><subject>Water treatment and pollution</subject><issn>0043-1354</issn><issn>1879-2448</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2000</creationdate><recordtype>article</recordtype><recordid>eNqFkEtLxDAQgIMouD5-gpCDiB6qeTVpvMgivkDwoB48hWwycSPdVpNW0F9vu7vo0dMwM9_MJB9CB5ScUkLl2SMhgheUl-JY65MxoUW5gSa0UrpgQlSbaPKLbKOdnN8IIYxxPUEvU9fFT9uBx7nu_SvgULfO9bXtYtuc47Yp6tgA9tBBWsRmWcZtWGI4x2_AtvG4mwOGEMB1Yy_PwaY9tBVsnWF_HXfR8_XV0-Vtcf9wc3c5vS-c4LwrZgqkUB4kVRWDmdQauKLUO0dmygnKWcUkdaoKgVrmy5IN7ZkkzEunK1HxXXS02vue2o8ecmcWMTuoa9tA22dDVVkSIcUAlivQpTbnBMG8p7iw6ctQYkaRZinSjJaM1mYp0pTD3OH6gM3O1iHZxsX8N8wrydX4josVBsNnPyMkk12ExoGPafBifBv_OfQDW-OGnA</recordid><startdate>20000615</startdate><enddate>20000615</enddate><creator>Biggs, C.A</creator><creator>Lant, P.A</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7T7</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope></search><sort><creationdate>20000615</creationdate><title>Activated sludge flocculation: on-line determination of floc size and the effect of shear</title><author>Biggs, C.A ; Lant, P.A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c433t-b7e647de61782eb699e3711dcc0b7c41328261c78ff1a2d552371b602d6c98483</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2000</creationdate><topic>Applied sciences</topic><topic>Biological and medical sciences</topic><topic>Biological treatment of waters</topic><topic>Biotechnology</topic><topic>Environment and pollution</topic><topic>Exact sciences and technology</topic><topic>floc size</topic><topic>flocculation</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>General purification processes</topic><topic>Industrial applications and implications. Economical aspects</topic><topic>Pollution</topic><topic>shear</topic><topic>sonication</topic><topic>Wastewaters</topic><topic>Water treatment and pollution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Biggs, C.A</creatorcontrib><creatorcontrib>Lant, P.A</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Aqualine</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Water research (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Biggs, C.A</au><au>Lant, P.A</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Activated sludge flocculation: on-line determination of floc size and the effect of shear</atitle><jtitle>Water research (Oxford)</jtitle><date>2000-06-15</date><risdate>2000</risdate><volume>34</volume><issue>9</issue><spage>2542</spage><epage>2550</epage><pages>2542-2550</pages><issn>0043-1354</issn><eissn>1879-2448</eissn><coden>WATRAG</coden><abstract>This paper presents a technique which enables on-line monitoring of activated sludge flocculation. The usefulness of this technique is demonstrated by investigating the effect of shear on steady-state floc sizes. The technique is based on a method developed to investigate flocculation of inorganic particles. Samples of activated sludge are sonicated for 3 min at 50 W to produce the necessary primary particles to observe flocculation. The samples are then stirred in a batch mixing vessel and sized on-line using a Malvern Mastersizer/E.
The dynamics of flocculation were found to be reproducible and follow the principles of inorganic shear induced flocculation. The median floc size was found to increase until an equilibrium between the rates of aggregation and breakage was reached. At this point, a steady-state floc size was maintained.
The effect of shear on the steady-state floc size was quantified using the experimental technique. The change in floc size with shear followed a power law relationship. This relationship was used to investigate the breakage mechanisms.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/S0043-1354(99)00431-5</doi><tpages>9</tpages></addata></record> |
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| ispartof | Water research (Oxford), 2000-06, Vol.34 (9), p.2542-2550 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Applied sciences Biological and medical sciences Biological treatment of waters Biotechnology Environment and pollution Exact sciences and technology floc size flocculation Fundamental and applied biological sciences. Psychology General purification processes Industrial applications and implications. Economical aspects Pollution shear sonication Wastewaters Water treatment and pollution |
| title | Activated sludge flocculation: on-line determination of floc size and the effect of shear |
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