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Leitlinien Unfallchirurgie
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This work deals with the evaluation of the performance of a multiple-stage anaerobic digestion process with respect to the degradation of organic matter and the inactivation of pathogenic and indicator organisms in liquid dairy cattle manure. Investigations were performed at bench- and full-scale.
During the three-stage mesophilic-thermophilic-mesophilic anaerobic treatment of liquid manure from cattle receiving a high-fiber diet, a comparably high methane yield of 0.24 m3 per kg of volatile solids was achieved. Given a minimum guaranteed retention time of 4 h at 55°C, the level of fecal coliforms in liquid manure was reduced to below 10 MPN per g fresh matter. The concentration of infectious oocysts of Cryptosporidium parvum was reduced by more than 5 log-units. Increasing the feeding interval from 1 to 4 h had no significant influence on the performance of the system. When the temperature in the first treatment stage was decreased from 38 to 20-25°C, the process stability in the thermophilic reactor was significantly improved while overall the methane yield and the reduction of indicator organisms remained essentially unchanged.
Based on these findings, two-stage thermophilic-mesophilic anaerobic digestion can be approved as a treatment technology for liquid manure to minimize the input of pathogenic and indicator organisms from livestock farming into the environment.
ISBN-10 (Impresion) | 3867276528 |
ISBN-13 (Impresion) | 9783867276528 |
ISBN-13 (E-Book) | 9783736926523 |
Idioma | Inglés |
Numero de paginas | 144 |
Laminacion de la cubierta | Brillante |
Edicion | 1 |
Volumen | 0 |
Lugar de publicacion | Göttingen |
Lugar de la disertacion | München |
Fecha de publicacion | 25.07.2008 |
Clasificacion simple | Tesis doctoral |
Area |
Agricultura
|
Palabras claves | Anaerobe Behandlung; Biogas; Gülle; Milchvieh; Krankheitserreger; Indikatororganismen; mesophil; thermophil; Kryptosporidien |