Optimisation of biological nitrogen removal processes to treat reject water from anaerobic digestion of sewage sludge

dc.contributor
Universitat de Barcelona. Departament d'Enginyeria Química i Metal·lúrgia
dc.contributor.author
Galí Serra, Alexandre
dc.date.accessioned
2011-04-12T13:34:37Z
dc.date.available
2006-10-16
dc.date.issued
2006-10-03
dc.date.submitted
2006-10-16
dc.identifier.isbn
8469021311
dc.identifier.uri
http://www.tdx.cat/TDX-1016106-115805
dc.identifier.uri
http://hdl.handle.net/10803/1527
dc.description.abstract
In the present work, the biological treatment of real reject water (800 mg NH4+-N L-1) from anaerobic digestion of sewage sludge from a waste water treatment plant (WWTP) is carried out. <br/>The process was optimised with a Sequencing Batch Reactors (SBR) of 3 L using methanol for denitrification due to the lack of a readily biodegradable organic carbon source. Process kinetics were compared through the specific Ammonium Uptake Rate (sAUR) finding the appropriate operational sequence at 32ºC with an 8 hour cycle length. Every operational cycle was carried out with a solid retention time (SRT) of 11 days, hydraulic retention time (HRT) of 1 day and 2500 mg VSS L-1. In order to avoid nitrate formation, and thus to save costs, the oxygen concentration was maintained below 1 mg L-1 during the aerobic periods and pH remained within an optimal range (7.5-8.5) alternating different aerobic/anoxic sub-cycles inside the operational cycle. The total nitrogen removal was 0.8-0.9 kg N day-1 m-3. In order to make the process more economical metanol was substitute for the primary hidrolysate of the own WWTP obtaining a total nitrogen removal of 0.7 kg N day-1 m-3. The use of primary hidrolysate would lead to a cost reduction of 0.2-0.3 kg -1 N removed.<br/>The next step was to compare the SBR technology to obtain the nitrite route with the continuous technology using a chemostat reactor. In that a chemostat SHARON (Single-reactor High activity Ammonia Removal Over Nitrite) continuous reactor (4 L) was operated to develop the biological nitrogen removal via nitrite of reject water at 33 ºC. Methanol was added for denitrification In the same chemostat took place nitrification and denitrification alternating periods of 1 hour with a total HRT of 2. As a conclusion, the SBR would be a slightly cheaper process (1.01 versus 1.28 kg -1 N) due to the higher volumetric reaction rates and the SHARON process is a more stable system.
eng
dc.format.mimetype
application/pdf
dc.language.iso
eng
dc.publisher
Universitat de Barcelona
dc.rights.license
ADVERTIMENT. 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.
dc.source
TDX (Tesis Doctorals en Xarxa)
dc.subject
Dentrificació
dc.subject
Nitrificació
dc.subject
Clavegueram
dc.subject
Tecnologia de depuració d'aigues
dc.subject.other
Ciències Experimentals i Matemàtiques
dc.title
Optimisation of biological nitrogen removal processes to treat reject water from anaerobic digestion of sewage sludge
dc.type
info:eu-repo/semantics/doctoralThesis
dc.type
info:eu-repo/semantics/publishedVersion
dc.subject.udc
628
cat
dc.contributor.authoremail
alexandregali@gmail.com
dc.contributor.director
Mata Álvarez, Joan
dc.rights.accessLevel
info:eu-repo/semantics/openAccess
cat
dc.identifier.dl
B.49997-2006


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