Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester.

Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester. Abstract Text:

C Gallert,J Winter,C Gallert,J Winter,C Gallert,J Winter,

The methane formation rate of 300 m(3) of sludge from a full scale biowaste reactor, that was stored without feeding for six weeks during a maintenance period, was about 60% of the methanogenic activity before maintenance. The 300 m(3) sludge was then pumped back into the biowaste reactor. On the third day, after refilling of the stored biowaste suspension, anaerobic conditions were obtained and feeding was started by addition of 36.1 m(3) of fresh biowaste suspension (=11.3 tons biowaste). The pH dropped from originally pH 7.7 to pH 7.3 and later on to pH 6.8, which was considered the minimum allowed pH for methanogenesis to recover. Maximum concentrations of acetate (1.78 gl(-1)), n-butyrate (0.57 gl(-1)) and n-valerate (0.44 gl(-1)) accumulated during the following days with feeding of 11.8 tons on day 5 and twice 6.5 tons on days 7 and 9, respectively. Thereafter, acetate, n-butyrate and n-valerate were degraded completely, whereas the concentration of propionate was still increasing. Propionic acid was the dominant fatty acid during the restart period and reached its maximum concentration of 6.2 gl(-1) 17 days after start of feeding. This high level of propionate was degraded completely in about 5 days with maximum degradation rates of 2.14 gl(-1)d(-1), and the pH of the anaerobic sludge increased from 7.1 to 7.4. During restart, the methane content of the biogas increased successively to 65%. Samples that were taken at different time intervals during the restart phase of the methane reactor showed different fatty acid degradation capabilities. After 10 days, when acetate and n-butyrate still accumulated in the methane reactor the maximum acetate degradation rate was 1.52 gl(-1)d(-1) and the n-butyrate degradation rate was 0.51 gl(-1)d(-1). Oxidation of n-valerate caused an increase of propionate, which was degraded after a lag phase of 6 days with a maximum rate of 0.6 gl(-1)d(-1). In the samples taken after 16 and 23 days, the propionate degradation rate increased to 1.42 gl(-1)d(-1) and 1.55 gl(-1)d(-1), respectively, and the lag phase for propionate degradation was reduced or had disappeared completely. The maximum propionate degradation rate was measured in the methane reactor in the fourth week after restart. The synthrophic propionate oxidizing bacteria were apparently the most suffering bacteria during sludge storage. If the propionate oxidizing bacteria could be kept active and the propionate degrading activity of the biowaste suspension of 6.16 gl(-1)d(-1) before the maintenance period could be maintained, then accumulation of 6.2 gl(-1) propionate in the methane reactor after restart could be avoided and full activity reached even earlier.

Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester. Publishing Authors By Initials

C Gallert,J Winter,C Gallert,J Winter,C Gallert,J Winter,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Bioresource technology

VOLUME: 99

Page Numbers: 170-8

Journal Abbreviation: Bioresour. Technol.

ISSN: 0960-8524

DAY: 2

MONTH: 01

YEAR: 2007

Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9889523

Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester.

AFFILIATION: Institut für Ingenieurbiologie und Biotechnologie des Abwassers, Universität Karlsruhe, Am Fasanengarten, Karlsruhe, Germany.

Country: England

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Bioresour Technol

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester Related Publications

• A piece of my mind. Perceptions.
• A pyrazolate-based metalorganic tantalum precursor that exhibits high thermal stability and its use in the atomic layer deposition of ta(2)o(5).
• Antagonism of phencyclidine-induced stimulus control in the rat by other psychoactive drugs.
• Arg-Pro-X-Ser/Thr is a consensus phosphoacceptor sequence for the meiosis-specific Ime2 protein kinase in Saccharomyces cerevisiae.
• Candida (Monilia) infections in children.
• Capturing the interaction potential of amyloidogenic proteins.
• Diarrhoea, ascites and eosinophilia: An unusual triad.
• Editorial: networking clinical research.
• Effects of periparturient systemic treatment with penethamate hydriodide on udder health and milk yield of dairy heifers.
• Elegance, silence and nonsense in the mutations literature for solid tumors.
• Ex-Vivo Expansion of CFU-GM and BFU-E in Unselected PBMC Cultures with Flt3L is Enhanced by Autologous Plasma.
• Hallucinogen-like effects of N,N-dipropyltryptamine (DPT): Possible mediation by serotonin 5-HT(1A) and 5-HT(2A) receptors in rodents.
• Home stroke rehabilitation for the upper limbs.
• Improving the accuracy of feature extraction for flexible endoscope calibration by spatial super resolution.
• Marked decrease of LSD-induced stimulus control in serotonin transporter knockout mice.
• Mechanism of islet amyloid polypeptide fibrillation at lipid interfaces studied by infrared reflection absorption spectroscopy.
• Photoprotection, photosynthesis and growth of tropical tree seedlings under near-ambient and strongly reduced solar ultraviolet-B radiation.
• Pressure tuning of the morphology of heterogeneous lipid vesicles: a two-photon-excitation fluorescence microscopy study.
• Propionic acid accumulation and degradation during restart of a full-scale anaerobic biowaste digester.
• Quantum nonlocality and beyond: limits from nonlocal computation.
• Reflections on the knowledge base for obstetric fistula.
• Repertoires of aggregation-resistant human antibody domains.
• Stability of spikes in the shadow Gierer-Meinhardt system with Robin boundary conditions.
• The role of thrombomodulin in malignancy.
• The stimulus effects of 8-OH-DPAT: Evidence for a 5-HT(2A) receptor-mediated component.
• The temporal representation of the delay of dynamic iterated rippled noise with positive and negative gain by single units in the ventral cochlear nucleus.
• XXYY syndrome with schizophrenia: implications for genetic research in psychotic spectrum disorders.
• [In Process Citation]
• [In Process Citation]
• pH-induced protonation of lysine in aqueous solution causes chemical shifts in X-ray photoelectron spectroscopy.