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A start-up of psychrophilic anaerobic sequence batch reactor digesting a 35 % total solids feed of dairy manure and wheat straw.

Saady NM, Massé DI - AMB Express (2015)

Bottom Line: The inoculum-to-substrate (VS-based) ratio ranged from 4.06 to 4.47.Although methanogenesis proceeded fairly well the hydrolysis seemed to be the rate limiting step.It is possible start up psychrophilic dry anaerobic digestion of cow feces and wheat straw at feed TS of 35 % within 7-10 successive cycles (147-210 days).

View Article: PubMed Central - PubMed

Affiliation: Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, J1M 0C8, Canada, nmcata@yahoo.com.

ABSTRACT
Zero liquid discharge is currently an objective in livestock manure management to minimize water pollution. This paper reports the start-up phase of a novel psychrophilic (20 °C) dry anaerobic digestion of dairy manure with bedding fed at 35 % total solids and an organic loading rate of 3.0 g total chemical oxygen demand kg(-1) inoculum day(-1) in anaerobic sequence batch reactors. The specific methane (CH4) yield ranged from 165.4 ± 9.8 to 213.9 ± 13.6 NL CH4 kg(-1) volatile solids (VS) with an overall average of 188 ± 17 NL CH4 kg(-1) VS during 11 successive start-up cycles (231 days) and a maximum CH4 production rate of 10.2 ± 0.6 NL CH4 kg(-1) VS day(-1). The inoculum-to-substrate (VS-based) ratio ranged from 4.06 to 4.47. Although methanogenesis proceeded fairly well the hydrolysis seemed to be the rate limiting step. It is possible start up psychrophilic dry anaerobic digestion of cow feces and wheat straw at feed TS of 35 % within 7-10 successive cycles (147-210 days).

No MeSH data available.


pH profile for the cow feces and wheat straw psychrophilic dry anaerobic digestion at 35 % total solids
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Fig4: pH profile for the cow feces and wheat straw psychrophilic dry anaerobic digestion at 35 % total solids

Mentions: The profiles of the VFAs concentration and the high level of methane production during the successive cycles indicate that acetogenic and methanogenic reactions proceeded fairly well. The relative stability of the pH profile around 7.2 ± 0.6 (Fig. 4) was due the sufficient alkalinity which ranged between 9.6 ± 0.56 and 9.4 ± 0.42 g CaCO3 L−1 for the inoculum-substrate mixture immediately after feeding. The alkalinity of the inoculum at the end of cycles ranged between 9.7 ± 0.32 and ±11.8 ± 0.65 g CaCO3 L−1 (Table 2).Fig. 4


A start-up of psychrophilic anaerobic sequence batch reactor digesting a 35 % total solids feed of dairy manure and wheat straw.

Saady NM, Massé DI - AMB Express (2015)

pH profile for the cow feces and wheat straw psychrophilic dry anaerobic digestion at 35 % total solids
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4542858&req=5

Fig4: pH profile for the cow feces and wheat straw psychrophilic dry anaerobic digestion at 35 % total solids
Mentions: The profiles of the VFAs concentration and the high level of methane production during the successive cycles indicate that acetogenic and methanogenic reactions proceeded fairly well. The relative stability of the pH profile around 7.2 ± 0.6 (Fig. 4) was due the sufficient alkalinity which ranged between 9.6 ± 0.56 and 9.4 ± 0.42 g CaCO3 L−1 for the inoculum-substrate mixture immediately after feeding. The alkalinity of the inoculum at the end of cycles ranged between 9.7 ± 0.32 and ±11.8 ± 0.65 g CaCO3 L−1 (Table 2).Fig. 4

Bottom Line: The inoculum-to-substrate (VS-based) ratio ranged from 4.06 to 4.47.Although methanogenesis proceeded fairly well the hydrolysis seemed to be the rate limiting step.It is possible start up psychrophilic dry anaerobic digestion of cow feces and wheat straw at feed TS of 35 % within 7-10 successive cycles (147-210 days).

View Article: PubMed Central - PubMed

Affiliation: Dairy and Swine Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, QC, J1M 0C8, Canada, nmcata@yahoo.com.

ABSTRACT
Zero liquid discharge is currently an objective in livestock manure management to minimize water pollution. This paper reports the start-up phase of a novel psychrophilic (20 °C) dry anaerobic digestion of dairy manure with bedding fed at 35 % total solids and an organic loading rate of 3.0 g total chemical oxygen demand kg(-1) inoculum day(-1) in anaerobic sequence batch reactors. The specific methane (CH4) yield ranged from 165.4 ± 9.8 to 213.9 ± 13.6 NL CH4 kg(-1) volatile solids (VS) with an overall average of 188 ± 17 NL CH4 kg(-1) VS during 11 successive start-up cycles (231 days) and a maximum CH4 production rate of 10.2 ± 0.6 NL CH4 kg(-1) VS day(-1). The inoculum-to-substrate (VS-based) ratio ranged from 4.06 to 4.47. Although methanogenesis proceeded fairly well the hydrolysis seemed to be the rate limiting step. It is possible start up psychrophilic dry anaerobic digestion of cow feces and wheat straw at feed TS of 35 % within 7-10 successive cycles (147-210 days).

No MeSH data available.