Behaviour of molecular weight distribution for the liquid fraction of pig slurry treated by anaerobic digestion

D. C. Rodriguez; M. Belmonte; G. Peñuela; J. L. Campos; G. Vidal

doi:10.1080/09593330.2010.501821

Behaviour of molecular weight distribution for the liquid fraction of pig slurry treated by anaerobic digestion

D. C. Rodriguez, M. Belmonte, G. Peñuela, J. L. Campos, G. Vidal

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Pig slurry was treated in an upflow anaerobic sludge blanket (UASB) reactor. To maintain a stable operation, the organic loading rate (OLR) applied to the system was increased stepwise by decreasing the dilution ratio of the pig slurry. Finally, during the last operational stage, no dilution was applied to the influent. The reactor maintained a soluble chemical oxygen demand (COD _s) removal efficiency of 82% when OLRs lower than 1.73 g CODs l ^-1 d^-1 were applied, although its efficiency fell to 55% when operated at 2.48 g COD_s l^-1 d^-1. System performance was not affected by the presence of free ammonia (concentrations up to 375 mg NH₃ l^-1). The distribution of the different molecular weight fractions changed significantly during anaerobic digestion. Proteins contained in the fractions higher than 10,000 Daltons are less degraded than those belonging to the lower fractions. An important percentage of both COD and BOD₅ in the effluent were observed in the lowest fraction, probably caused by the presence of volatile fatty acids (VFA).

Original language	English
Pages (from-to)	419-425
Number of pages	7
Journal	Environmental Technology (United Kingdom)
Volume	32
Issue number	4
DOIs	https://doi.org/10.1080/09593330.2010.501821
State	Published - Mar 2011
Externally published	Yes

Keywords

UASB
anaerobic treatment
free ammonia
molecular weight distribution
pig slurry

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10.1080/09593330.2010.501821

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title = "Behaviour of molecular weight distribution for the liquid fraction of pig slurry treated by anaerobic digestion",

abstract = "Pig slurry was treated in an upflow anaerobic sludge blanket (UASB) reactor. To maintain a stable operation, the organic loading rate (OLR) applied to the system was increased stepwise by decreasing the dilution ratio of the pig slurry. Finally, during the last operational stage, no dilution was applied to the influent. The reactor maintained a soluble chemical oxygen demand (COD s) removal efficiency of 82% when OLRs lower than 1.73 g CODs l -1 d-1 were applied, although its efficiency fell to 55% when operated at 2.48 g CODs l-1 d-1. System performance was not affected by the presence of free ammonia (concentrations up to 375 mg NH3 l-1). The distribution of the different molecular weight fractions changed significantly during anaerobic digestion. Proteins contained in the fractions higher than 10,000 Daltons are less degraded than those belonging to the lower fractions. An important percentage of both COD and BOD5 in the effluent were observed in the lowest fraction, probably caused by the presence of volatile fatty acids (VFA).",

keywords = "UASB, anaerobic treatment, free ammonia, molecular weight distribution, pig slurry",

author = "Rodriguez, {D. C.} and M. Belmonte and G. Pe{\~n}uela and Campos, {J. L.} and G. Vidal",

note = "Funding Information: This work was supported by CONICYT/PBCT (Grant TPI-01), FONDECYT (Grant 1090414) and Innova Bio Bio (Grant 07-PC S1-198). The authors wish to thank Mr C. Contreras from Sucesion Yanine for use of its facilities. D.C. Rodr{\'i}guez is supported by European ALFA Grant No. II-0311-FA-FCD-FI-FC. Dr Campos wishes to thank Direcci{\'o}n de Investigaci{\'o}n (UDEC) for supporting the stay at the Environmental Science Centre EULA-Chile, Universidad de Concepci{\'o}n (Chile).",

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doi = "10.1080/09593330.2010.501821",

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AU - Rodriguez, D. C.

AU - Belmonte, M.

AU - Peñuela, G.

AU - Campos, J. L.

AU - Vidal, G.

N1 - Funding Information: This work was supported by CONICYT/PBCT (Grant TPI-01), FONDECYT (Grant 1090414) and Innova Bio Bio (Grant 07-PC S1-198). The authors wish to thank Mr C. Contreras from Sucesion Yanine for use of its facilities. D.C. Rodríguez is supported by European ALFA Grant No. II-0311-FA-FCD-FI-FC. Dr Campos wishes to thank Dirección de Investigación (UDEC) for supporting the stay at the Environmental Science Centre EULA-Chile, Universidad de Concepción (Chile).

PY - 2011/3

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N2 - Pig slurry was treated in an upflow anaerobic sludge blanket (UASB) reactor. To maintain a stable operation, the organic loading rate (OLR) applied to the system was increased stepwise by decreasing the dilution ratio of the pig slurry. Finally, during the last operational stage, no dilution was applied to the influent. The reactor maintained a soluble chemical oxygen demand (COD s) removal efficiency of 82% when OLRs lower than 1.73 g CODs l -1 d-1 were applied, although its efficiency fell to 55% when operated at 2.48 g CODs l-1 d-1. System performance was not affected by the presence of free ammonia (concentrations up to 375 mg NH3 l-1). The distribution of the different molecular weight fractions changed significantly during anaerobic digestion. Proteins contained in the fractions higher than 10,000 Daltons are less degraded than those belonging to the lower fractions. An important percentage of both COD and BOD5 in the effluent were observed in the lowest fraction, probably caused by the presence of volatile fatty acids (VFA).

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Behaviour of molecular weight distribution for the liquid fraction of pig slurry treated by anaerobic digestion

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