Limits...
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.


Acetic acid profile for the cow feces and wheat straw psychrophilic dry anaerobic digestion at 35 % total solids in feed
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Fig3: Acetic acid profile for the cow feces and wheat straw psychrophilic dry anaerobic digestion at 35 % total solids in feed

Mentions: Profiles of acetic, propionic, and butyric acids produced during the successive cycles of PDAD were similar but at different concentration levels. The acetate profile is shown in Fig. 3. Throughout the successive cycles, acetic acid concentration peaked immediately after feeding to levels between 1000 and 1500 mg L−1 but was consumed within a week in all replicate bioreactors and its concentrations were maintained within 150 ± 50 mg L−1 indicating that methanogenesis reaction from acetate was not a rate limiting step after the first week. Similarly, propionic acid peaked to levels between 500 and 600 mg L−1 after feedings and was consumed within a week to levels close to the detection limits of the instrument (25 ± 10 mg L−1).Fig. 3


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)

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

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

Fig3: Acetic acid profile for the cow feces and wheat straw psychrophilic dry anaerobic digestion at 35 % total solids in feed
Mentions: Profiles of acetic, propionic, and butyric acids produced during the successive cycles of PDAD were similar but at different concentration levels. The acetate profile is shown in Fig. 3. Throughout the successive cycles, acetic acid concentration peaked immediately after feeding to levels between 1000 and 1500 mg L−1 but was consumed within a week in all replicate bioreactors and its concentrations were maintained within 150 ± 50 mg L−1 indicating that methanogenesis reaction from acetate was not a rate limiting step after the first week. Similarly, propionic acid peaked to levels between 500 and 600 mg L−1 after feedings and was consumed within a week to levels close to the detection limits of the instrument (25 ± 10 mg L−1).Fig. 3

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.