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Formaldehyde and urea removal in a denitrifying granular sludge blanket reactor
dc.contributor.author | Eiroa, M. | |
dc.contributor.author | Kennes, Christian | |
dc.contributor.author | Veiga, María Carmen | |
dc.date.accessioned | 2014-10-23T15:28:03Z | |
dc.date.available | 2014-10-23T15:28:03Z | |
dc.date.issued | 2004-09 | |
dc.identifier.citation | Eiroa M, Kennes C, Veiga MC. Formaldehyde and urea removal in a denitrifying granular sludge blanket reactor. Water Res. 2004;38(16):3495-502 | es_ES |
dc.identifier.other | DOI: 10.1016/j.watres.2004.04.055 | |
dc.identifier.uri | http://hdl.handle.net/2183/13727 | |
dc.description.abstract | Simultaneous formaldehyde biodegradation, urea hydrolysis and denitrification in anoxic batch assays and in a continuous laboratory anoxic reactor were investigated. In batch assays, the initial formaldehyde biodegradation rate was around 0.7 g CH2O g VSS−1 d−1 and independent of the urea concentration (90– 370 mg N–NH2CONH2 l−1). Urea was completely hydrolyzed to ammonium in the presence of 430 mg l−1 formaldehyde and complete denitrification took place in all cases (125 mg N–NO−3 l−1). Formaldehyde removal efficiencies above 99.5% were obtained in a lab-scale denitrifying upflow sludge blanket reactor at organic loading rates between 0.37 and 2.96 kg COD m−3 d−1 (625–5000 mg CH2O l−1). The urea loading rate was increased from 0.06 to 0.44 kg N m−3 d−1 (100–800 mg N–NH2CONH2 l−1) and hydrolysis to ammonium was around 77.5% at all loading rates. The denitrification process was always almost complete (100–800 mg N–NO3− l−1), due to the high COD/N ratio of 6.7 in the influent. A minimum value of 3.5 was found to be required for full denitrification. The composition of the biogas indicated that denitrification and methanogenesis occurred simultaneously in the same unit. A good granulation of the sludge was observed. | es_ES |
dc.language.iso | eng | es_ES |
dc.publisher | Elsevier | es_ES |
dc.relation.uri | http://dx.doi.org/10.1016/j.watres.2004.04.055 | es_ES |
dc.subject | Formaldehyde | es_ES |
dc.subject | Urea | es_ES |
dc.subject | Biodegradation | es_ES |
dc.subject | Hydrolysis | es_ES |
dc.subject | Denitrification | es_ES |
dc.subject | Granulation | es_ES |
dc.title | Formaldehyde and urea removal in a denitrifying granular sludge blanket reactor | es_ES |
dc.type | info:eu-repo/semantics/article | es_ES |
dc.rights.access | info:eu-repo/semantics/openAccess | es_ES |
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