TY - JOUR

T1 - Bio-acidification of animal slurry

T2 - Efficiency, stability and the mechanisms involved

AU - Regueiro, I.

AU - Gómez-Muñoz, B.

AU - Lübeck, M.

AU - Hjorth, M.

AU - Jensen, L. Stoumann

N1 - Publisher Copyright: © 2022 The Authors

PY - 2022

Y1 - 2022

N2 - Slurry acidification is effective for reducing gaseous emissions during slurry storage. However, an alternative to sulfuric acid traditionally used is needed. This study investigated the efficiency of slurry bio-acidification treatment by adding different types and amounts of fermentable substrates to initiate and sustain the fermentation process. The carbon pools in the slurry were quantified to understand the mechanisms involved during the bio-acidification. Substrate addition efficiently reduced slurry pH during storage via lactic acid production. Substrates with a low pH proved beneficial in initiating the fermentation process, but higher glucose dosage did not produce the highest lactic acid concentration. Once the treated slurries reached pH 4.2 during the fermentation process, the production of lactic acid was promoted and provided substrate was still available, the weaker volatile fatty acids were avoided, resulting in lower CH4 emissions. In conclusion, bio-acidification could replace the sulfuric acid to reduce gaseous emissions during slurry storage.

AB - Slurry acidification is effective for reducing gaseous emissions during slurry storage. However, an alternative to sulfuric acid traditionally used is needed. This study investigated the efficiency of slurry bio-acidification treatment by adding different types and amounts of fermentable substrates to initiate and sustain the fermentation process. The carbon pools in the slurry were quantified to understand the mechanisms involved during the bio-acidification. Substrate addition efficiently reduced slurry pH during storage via lactic acid production. Substrates with a low pH proved beneficial in initiating the fermentation process, but higher glucose dosage did not produce the highest lactic acid concentration. Once the treated slurries reached pH 4.2 during the fermentation process, the production of lactic acid was promoted and provided substrate was still available, the weaker volatile fatty acids were avoided, resulting in lower CH4 emissions. In conclusion, bio-acidification could replace the sulfuric acid to reduce gaseous emissions during slurry storage.

KW - Anaerobic fermentation

KW - Animal slurry

KW - Bio-acidification

KW - Circular economy

KW - Organic farming

U2 - 10.1016/j.biteb.2022.101135

DO - 10.1016/j.biteb.2022.101135

M3 - Journal article

AN - SCOPUS:85133415004

VL - 19

JO - Bioresource Technology Reports

JF - Bioresource Technology Reports

SN - 2589-014X

M1 - 101135

ER -