Characterization of adsorption properties of extracellular polymeric substances (EPS) extracted from sludge

Extracellular polymeric substances (EPS) of sludge play an important role in the adsorption of organic pollutants in wastewater biological treatments. Experiments were conducted to characterize the adsorption properties of EPS extracted from aerobic sludge (AE-EPS) and anaerobic sludge (AN-EPS) usin...

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Veröffentlicht in:Colloids and surfaces, B, Biointerfaces B, Biointerfaces, 2008-03, Vol.62 (1), p.83-90
Hauptverfasser: Sheng, Guo-Ping, Zhang, Meng-Lin, Yu, Han-Qing
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Zhang, Meng-Lin
Yu, Han-Qing
description Extracellular polymeric substances (EPS) of sludge play an important role in the adsorption of organic pollutants in wastewater biological treatments. Experiments were conducted to characterize the adsorption properties of EPS extracted from aerobic sludge (AE-EPS) and anaerobic sludge (AN-EPS) using a dye-probing method in this study. A model cationic dye, Toluidine blue (TB), was used as the dye probe. The adsorption of dye onto EPS to produce a dye–EPS complex would cause a change in the solution absorbance, attributed to the difference between the visible spectra of the dye and dye–EPS complex. From the change in the absorbance, the equilibrium absorption capability of EPS could be evaluated. Results indicate that Langmuir adsorption isotherm was able to adequately describe the adsorption equilibrium of TB onto both EPS at various pH values. From the Langmuir adsorption isotherm, the maximum binding capabilities were calculated to be 1.9 and 2.5 mmol/g EPS for AE-EPS at pH 7.0 and 11.0, and 1.6 and 1.9 mmol/g EPS for AN-EPS at pH 7.0 and 11.0, respectively. The first-order rate constants were calculated to be 0.033 and 0.35 min −1 for AE-EPS at pH 7.0 and 11.0, and 0.069 and 0.18 min −1 for AN-EPS at pH 7.0 and 11.0, respectively. The results of the present study demonstrated that the dye-probing method was appropriate for investigating the adsorption process of EPS in aqueous solution.
doi_str_mv 10.1016/j.colsurfb.2007.09.024
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Experiments were conducted to characterize the adsorption properties of EPS extracted from aerobic sludge (AE-EPS) and anaerobic sludge (AN-EPS) using a dye-probing method in this study. A model cationic dye, Toluidine blue (TB), was used as the dye probe. The adsorption of dye onto EPS to produce a dye–EPS complex would cause a change in the solution absorbance, attributed to the difference between the visible spectra of the dye and dye–EPS complex. From the change in the absorbance, the equilibrium absorption capability of EPS could be evaluated. Results indicate that Langmuir adsorption isotherm was able to adequately describe the adsorption equilibrium of TB onto both EPS at various pH values. From the Langmuir adsorption isotherm, the maximum binding capabilities were calculated to be 1.9 and 2.5 mmol/g EPS for AE-EPS at pH 7.0 and 11.0, and 1.6 and 1.9 mmol/g EPS for AN-EPS at pH 7.0 and 11.0, respectively. The first-order rate constants were calculated to be 0.033 and 0.35 min −1 for AE-EPS at pH 7.0 and 11.0, and 0.069 and 0.18 min −1 for AN-EPS at pH 7.0 and 11.0, respectively. 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The first-order rate constants were calculated to be 0.033 and 0.35 min −1 for AE-EPS at pH 7.0 and 11.0, and 0.069 and 0.18 min −1 for AN-EPS at pH 7.0 and 11.0, respectively. The results of the present study demonstrated that the dye-probing method was appropriate for investigating the adsorption process of EPS in aqueous solution.</description><subject>Adsorption</subject><subject>Aerobiosis</subject><subject>Anaerobiosis</subject><subject>Dye</subject><subject>Extracellular polymeric substances (EPS)</subject><subject>Hydrogen-Ion Concentration</subject><subject>Kinetics</subject><subject>Langmuir</subject><subject>Polymers - chemistry</subject><subject>Polymers - isolation &amp; purification</subject><subject>Sewage - chemistry</subject><subject>Spectrophotometry</subject><subject>Tolonium Chloride - chemistry</subject><subject>Toluidine blue</subject><issn>0927-7765</issn><issn>1873-4367</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqFkE9v2yAYh9HUakmzfYXIp6o92AVjG3NrFaXdpEibtO2MMLy0pHZwAU_NPn3JkmrHndArnt_750FoSXBBMGlutoVyfZi86YoSY1ZgXuCy-oDmpGU0r2jDztAc85LljDX1DF2EsMU4IYR9RDPCeNu2tJ2j59WT9FJF8PaPjNbtMmcyqYPz499q9G4EHy2Ewwe8xgRD30-99Nno-v2QgioLUxei3KlEXa2__7g-gRF0ZrwbstBP-hE-oXMj-wCfT-8C_bpf_1x9yTffHr6u7ja5opzF3NTAK9YxRqg2hneMtrWhvGGdKk0rFTNGdgZzqYikLdfcNBQb3VWUE6Wpogt0eeybln-ZIEQx2HDYWu7ATUGUuGY1qXACmyOovAvBgxGjt4P0e0GwOGgWW_GuWRw0C8xFcpiCy9OEqRtA_4udvCbg9ghAuvO3BS-CspAEaetBRaGd_d-MNycPlcI</recordid><startdate>20080315</startdate><enddate>20080315</enddate><creator>Sheng, Guo-Ping</creator><creator>Zhang, Meng-Lin</creator><creator>Yu, Han-Qing</creator><general>Elsevier B.V</general><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>7QO</scope><scope>8FD</scope><scope>FR3</scope><scope>P64</scope></search><sort><creationdate>20080315</creationdate><title>Characterization of adsorption properties of extracellular polymeric substances (EPS) extracted from sludge</title><author>Sheng, Guo-Ping ; Zhang, Meng-Lin ; Yu, Han-Qing</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c397t-f5e947b7713dff9b7385f3967bc2f8ac7ffabf09ac1a389d9f630fdb4391cd3c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Adsorption</topic><topic>Aerobiosis</topic><topic>Anaerobiosis</topic><topic>Dye</topic><topic>Extracellular polymeric substances (EPS)</topic><topic>Hydrogen-Ion Concentration</topic><topic>Kinetics</topic><topic>Langmuir</topic><topic>Polymers - chemistry</topic><topic>Polymers - isolation &amp; purification</topic><topic>Sewage - chemistry</topic><topic>Spectrophotometry</topic><topic>Tolonium Chloride - chemistry</topic><topic>Toluidine blue</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sheng, Guo-Ping</creatorcontrib><creatorcontrib>Zhang, Meng-Lin</creatorcontrib><creatorcontrib>Yu, Han-Qing</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>Biotechnology Research Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Colloids and surfaces, B, Biointerfaces</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sheng, Guo-Ping</au><au>Zhang, Meng-Lin</au><au>Yu, Han-Qing</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization of adsorption properties of extracellular polymeric substances (EPS) extracted from sludge</atitle><jtitle>Colloids and surfaces, B, Biointerfaces</jtitle><addtitle>Colloids Surf B Biointerfaces</addtitle><date>2008-03-15</date><risdate>2008</risdate><volume>62</volume><issue>1</issue><spage>83</spage><epage>90</epage><pages>83-90</pages><issn>0927-7765</issn><eissn>1873-4367</eissn><abstract>Extracellular polymeric substances (EPS) of sludge play an important role in the adsorption of organic pollutants in wastewater biological treatments. Experiments were conducted to characterize the adsorption properties of EPS extracted from aerobic sludge (AE-EPS) and anaerobic sludge (AN-EPS) using a dye-probing method in this study. A model cationic dye, Toluidine blue (TB), was used as the dye probe. The adsorption of dye onto EPS to produce a dye–EPS complex would cause a change in the solution absorbance, attributed to the difference between the visible spectra of the dye and dye–EPS complex. From the change in the absorbance, the equilibrium absorption capability of EPS could be evaluated. Results indicate that Langmuir adsorption isotherm was able to adequately describe the adsorption equilibrium of TB onto both EPS at various pH values. From the Langmuir adsorption isotherm, the maximum binding capabilities were calculated to be 1.9 and 2.5 mmol/g EPS for AE-EPS at pH 7.0 and 11.0, and 1.6 and 1.9 mmol/g EPS for AN-EPS at pH 7.0 and 11.0, respectively. The first-order rate constants were calculated to be 0.033 and 0.35 min −1 for AE-EPS at pH 7.0 and 11.0, and 0.069 and 0.18 min −1 for AN-EPS at pH 7.0 and 11.0, respectively. The results of the present study demonstrated that the dye-probing method was appropriate for investigating the adsorption process of EPS in aqueous solution.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>17988838</pmid><doi>10.1016/j.colsurfb.2007.09.024</doi><tpages>8</tpages></addata></record>
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subjects Adsorption
Aerobiosis
Anaerobiosis
Dye
Extracellular polymeric substances (EPS)
Hydrogen-Ion Concentration
Kinetics
Langmuir
Polymers - chemistry
Polymers - isolation & purification
Sewage - chemistry
Spectrophotometry
Tolonium Chloride - chemistry
Toluidine blue
title Characterization of adsorption properties of extracellular polymeric substances (EPS) extracted from sludge
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