Methane inhibition from a slurry storage by addition of chemical and natural additives
2018
Mohd Saufi Bastami | Jones, Davey | Chadwick, Dave
Mitigating methane (CH4) emission from beef and dairy slurry manure by biogas processing is well adopted. However, the main constrains for small-medium farmers are start-up infrastructure, maintenance costs and efficiency and these issues need to be attended. A study was carried out to assess an alternative strategy in reducing CH4 emission during beef slurry storage by means of using additives. In doing so, cattle slurry from commercial beef farm was collected and stored with various additives at small scale (500 mL). The slurry CH4 emission, pH and oxidation redox potential (ORP) value were observed during the storage period. A closed respiratory meter (Micro-Oxymax) was employed to monitor the methane emissions during storage. Notably, a reduction in slurry pH (pH 4.0) through the addition of hydrochloric acid (HCl) has significantly reduced (p ≤0.05) CH4 emission. Furthermore, the addition of glucose (10% w/ v) has reduced slurry pH to 0.10% CH4). Apart from that, glucose addition revealed inconsistent effect on volatile fatty acids production and hence, the mechanism for ‘self-acidification’ is unclear. The addition of fermentable carbohydrates into slurry during storage period induced acidification by anaerobic fermentation, which subsequently has inhibited CH4 emission.
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