Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge

Nowadays, mesophilic anaerobic processes (under 35ºC) predominate but they show to be unable to accomplish the new specifications. Consequently, only the migration to higher temperature conditions, i.e. thermophilic operation, seems to be capable of producing stabilized sludge that meets the new res...

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Autor: Benabdallah El-Hadj, Toufik
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2006
País:España
Institución:CBUC, CESCA
Repositorio:TDR. Tesis Doctorales en Red
OAI Identifier:oai:www.tdx.cat:10803/1528
Acceso en línea:http://www.tdx.cat/TDX-1027106-115930
http://hdl.handle.net/10803/1528
Access Level:acceso abierto
Palabra clave:Compostos orgànics
Medi ambient
Contaminació
Llots i fangs residuals
Estacions depuradores
Tractament d'aigues residuals
Digestors anaeròbics
Ciències Experimentals i Matemàtiques
628
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oai_identifier_str oai:www.tdx.cat:10803/1528
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
title Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
spellingShingle Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
Benabdallah El-Hadj, Toufik
Compostos orgànics
Medi ambient
Contaminació
Llots i fangs residuals
Estacions depuradores
Tractament d'aigues residuals
Digestors anaeròbics
Ciències Experimentals i Matemàtiques
628
title_short Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
title_full Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
title_fullStr Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
title_full_unstemmed Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
title_sort Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage Sludge
dc.creator.none.fl_str_mv Benabdallah El-Hadj, Toufik
author Benabdallah El-Hadj, Toufik
author_facet Benabdallah El-Hadj, Toufik
author_role author
dc.contributor.none.fl_str_mv Mata Álvarez, Joan
Universitat de Barcelona. Departament d'Enginyeria Química i Metal·lúrgia
dc.subject.none.fl_str_mv Compostos orgànics
Medi ambient
Contaminació
Llots i fangs residuals
Estacions depuradores
Tractament d'aigues residuals
Digestors anaeròbics
Ciències Experimentals i Matemàtiques
628
topic Compostos orgànics
Medi ambient
Contaminació
Llots i fangs residuals
Estacions depuradores
Tractament d'aigues residuals
Digestors anaeròbics
Ciències Experimentals i Matemàtiques
628
description Nowadays, mesophilic anaerobic processes (under 35ºC) predominate but they show to be unable to accomplish the new specifications. Consequently, only the migration to higher temperature conditions, i.e. thermophilic operation, seems to be capable of producing stabilized sludge that meets the new restrictions related to the presence of harmful bacteria. In addition, the effect of anaerobic digestion on organic micropollutants has scarcely been studied. Moreover, the temperature impact on these compounds in anaerobic digestion of sewage sludge has also not been elucidated.<br/><br/>The overall objective of this work is to study the fate of some organic micropollutants during raw sewage sludge (RSS) anaerobic digestion and the effect of thermophilic temperature conditions on treatment efficiency, when compared with mesophilic anaerobic. To this purpose, a mesophilic and thermophilic anaerobic digester were operated using Waste Activated Sludge (WAS) as inoculum and the effects of Hydraulic Retention Time (HRT) reduction and its influence on the fate of the selected organic micropollutants (namely, PAH, DEHP, AOX, PCB, NPE and LAS) were studied. Furthermore, the effect of a complementary treatment, namely the ultrasonic pretreatment, on the biodegradability of the organic feed and the behaviour of the subsequent anaerobic digestion was also examined, focussing on the micropollutants reduction.<br/><br/>The main conclusions of every set experimental are presented:<br/><br/>Start-up and HRT reduction<br/><br/>· The use of WAS as inoculum for anaerobic digesters start-up represents a good option specially under thermophilic conditions.<br/><br/>· Thermophilic anaerobic digestion is a good alternative to mesophilic digestion in order to improve specific biogas production.<br/><br/>· The similar values of organic matter removal (VS) registered in both digesters.<br/><br/>· 8 days was found to be the minimum HRT for the thermophilic digester, since VFA accumulation and pH decrease inhibited the process when working at a lower HRT. <br/><br/>Organic micropollutants removal<br/><br/>· Organic micropollutants removal efficiency was enhanced under thermophilic conditions.<br/><br/>· The HRT influence was clearly observed for DEHP and PCB, independently of digestion temperature. However, it was temperature dependent for PAH, AOX, LAS and espcially for NPE.<br/><br/>· NPE and DEHP are identified as the more recalcitrants contaminants.<br/><br/>· The thermophilic conditions were not ensured the sludge safety conditions for agriculture use.<br/><br/>· The accumulation of some compounds as NP and LCB was observed.<br/><br/>· NP was stated as the intermediate compound of NPEO anaerobic degradation. Moreover, LCB were generated during HCB reductive dechlorination during anaerobic digestion.<br/><br/>· Monitoring the metabolites of cited contaminants can be elucidated their biodegradation mechanisms and prevent any undesirable effects.<br/><br/>Ultrasound-anaerobic digestion combined treatment<br/><br/>· Organic matter removal, SBP and naphthalene removal were enhanced using the combined treatment in both digesters.<br/><br/>· High organic matter removal, SBP and napthalene removal was registered in the thermo-digester.<br/><br/>· Higher was enhancement of organic matter removal, SBP and naphthalene removal in the meso-digester than in the thermo-digester. <br/><br/>· Pyrene removal was nearly the same with and without pretreatment.<br/><br/>· It seems that the ultrasonic pretreatment affect more the mesophilic than the thermophilic digestion.<br/><br/>· The results obtained in this combined treatment (ultrasound + anaerobic digestion) are promising and suggest the convenience of other investigations of other combined treatments to enhance the stabilized sludge quality.
publishDate 2006
dc.date.none.fl_str_mv 2006
2006
2006
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.none.fl_str_mv http://www.tdx.cat/TDX-1027106-115930
http://hdl.handle.net/10803/1528
url http://www.tdx.cat/TDX-1027106-115930
http://hdl.handle.net/10803/1528
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona
publisher.none.fl_str_mv Universitat de Barcelona
dc.source.none.fl_str_mv TDX (Tesis Doctorals en Xarxa)
reponame:TDR. Tesis Doctorales en Red
instname:CBUC, CESCA
instname_str CBUC, CESCA
reponame_str TDR. Tesis Doctorales en Red
collection TDR. Tesis Doctorales en Red
repository.name.fl_str_mv
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spelling Biodegradation of Organic Micropollutants in Themophilic and Mesophilic Anareobic Digestion of Sewage SludgeBenabdallah El-Hadj, ToufikCompostos orgànicsMedi ambientContaminacióLlots i fangs residualsEstacions depuradoresTractament d'aigues residualsDigestors anaeròbicsCiències Experimentals i Matemàtiques628Nowadays, mesophilic anaerobic processes (under 35ºC) predominate but they show to be unable to accomplish the new specifications. Consequently, only the migration to higher temperature conditions, i.e. thermophilic operation, seems to be capable of producing stabilized sludge that meets the new restrictions related to the presence of harmful bacteria. In addition, the effect of anaerobic digestion on organic micropollutants has scarcely been studied. Moreover, the temperature impact on these compounds in anaerobic digestion of sewage sludge has also not been elucidated.<br/><br/>The overall objective of this work is to study the fate of some organic micropollutants during raw sewage sludge (RSS) anaerobic digestion and the effect of thermophilic temperature conditions on treatment efficiency, when compared with mesophilic anaerobic. To this purpose, a mesophilic and thermophilic anaerobic digester were operated using Waste Activated Sludge (WAS) as inoculum and the effects of Hydraulic Retention Time (HRT) reduction and its influence on the fate of the selected organic micropollutants (namely, PAH, DEHP, AOX, PCB, NPE and LAS) were studied. Furthermore, the effect of a complementary treatment, namely the ultrasonic pretreatment, on the biodegradability of the organic feed and the behaviour of the subsequent anaerobic digestion was also examined, focussing on the micropollutants reduction.<br/><br/>The main conclusions of every set experimental are presented:<br/><br/>Start-up and HRT reduction<br/><br/>· The use of WAS as inoculum for anaerobic digesters start-up represents a good option specially under thermophilic conditions.<br/><br/>· Thermophilic anaerobic digestion is a good alternative to mesophilic digestion in order to improve specific biogas production.<br/><br/>· The similar values of organic matter removal (VS) registered in both digesters.<br/><br/>· 8 days was found to be the minimum HRT for the thermophilic digester, since VFA accumulation and pH decrease inhibited the process when working at a lower HRT. <br/><br/>Organic micropollutants removal<br/><br/>· Organic micropollutants removal efficiency was enhanced under thermophilic conditions.<br/><br/>· The HRT influence was clearly observed for DEHP and PCB, independently of digestion temperature. However, it was temperature dependent for PAH, AOX, LAS and espcially for NPE.<br/><br/>· NPE and DEHP are identified as the more recalcitrants contaminants.<br/><br/>· The thermophilic conditions were not ensured the sludge safety conditions for agriculture use.<br/><br/>· The accumulation of some compounds as NP and LCB was observed.<br/><br/>· NP was stated as the intermediate compound of NPEO anaerobic degradation. Moreover, LCB were generated during HCB reductive dechlorination during anaerobic digestion.<br/><br/>· Monitoring the metabolites of cited contaminants can be elucidated their biodegradation mechanisms and prevent any undesirable effects.<br/><br/>Ultrasound-anaerobic digestion combined treatment<br/><br/>· Organic matter removal, SBP and naphthalene removal were enhanced using the combined treatment in both digesters.<br/><br/>· High organic matter removal, SBP and napthalene removal was registered in the thermo-digester.<br/><br/>· Higher was enhancement of organic matter removal, SBP and naphthalene removal in the meso-digester than in the thermo-digester. <br/><br/>· Pyrene removal was nearly the same with and without pretreatment.<br/><br/>· It seems that the ultrasonic pretreatment affect more the mesophilic than the thermophilic digestion.<br/><br/>· The results obtained in this combined treatment (ultrasound + anaerobic digestion) are promising and suggest the convenience of other investigations of other combined treatments to enhance the stabilized sludge quality.Universitat de BarcelonaMata Álvarez, JoanUniversitat de Barcelona. Departament d'Enginyeria Química i Metal·lúrgia2011200620062006info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttp://www.tdx.cat/TDX-1027106-115930http://hdl.handle.net/10803/1528TDX (Tesis Doctorals en Xarxa)reponame:TDR. Tesis Doctorales en Redinstname:CBUC, CESCAInglésADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs.info:eu-repo/semantics/openAccessoai:www.tdx.cat:10803/15282026-06-14T12:46:07Z
score 15.301603

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