Co-digestion of salix and manure for biogas: importance of clone choice, coppicing frequency and reactor setup

Ohlsson, Jonas (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för Molekylära vetenskaper,Department of Molecular Sciences

Rönnberg Wästljung, Ann-Christin (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtbiologi,Department of Plant Biology

Nordh, Nils-Erik (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtproduktionsekologi,Department of Crop Production Ecology

Schnürer, Anna (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för Molekylära vetenskaper,Department of Molecular Sciences

(creator_code:org_t)

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Abstract Subject headings

Animalmanure represents amajor source of renewable energy that can be converted into biogasusing anaerobic digestion. In order to most efficiently utilize this resource, it can be co-digested withenergy dense, high biomethanation potential feedstocks such as energy crops. However, such feedstockstypically require pretreatments which are not feasible for small-scale facilities.We investigated theuse of single-stage and the sequential co-digestion of comminuted but otherwise non-pretreated Salixwith animal manure, and further investigated the effects of coppicing frequency and clone choice onbiomethanation potential and the area requirements for a typical Swedish farm-scale anaerobic digesterusing Salix and manure as feedstock. In comparison with conventional single-stage digestion, sequentialdigestion increased the volumetric and specific methane production by 57% to 577 NmL L?1 d?1 and192 NmL (g volatile solids (VS))?1, respectively. Biomethanation potential was the highest for the twoyear-old shoots, although gains in biomass productivity suggest that every-third-year coppicing maybe a better strategy for supplying Salix feedstock for anaerobic digestion. The biomethane productionperformance of the sequential digestion of minimally pretreated Salix mirrors that of hydrothermallypretreated hardwoods and may provide an option where such pretreatments are not feasible.

By the author/editor: Ohlsson, Jonas; Rönnberg Wästlju ...; Nordh, Nils-Erik; Schnürer, Anna

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Microbiology

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Other Biological ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Agricultural Sci ...

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