Methane production from thermophilic co‐digestion of dairy manure and waste milk obtained from therapeutically treated cows

Abstract

Methane production from co‐digestion of dairy manure and waste milk, milk from cows treated with antibiotics for mastitis, was tested in a 2 × 4 factorial design. Four different waste milk percentages (w/w): 0% (SM), 10% (SMWM10), 20% (SMWM20) and 30% (SMWM30), were tested with two slurry percentages (w/w): 50% (A) and 25% (B) and the rest being manure at 55°C for 12 days in batch digesters. The results analyzed using a Gompertz model showed SMWM10 produced the highest methane production potential (Pm)/g volatile solids added followed by SM in both A and B. This Pm of SMWM10 in A and B was statistically non‐significant (P > 0.05). More than 96% of cefazolin‐resistant bacteria and 100% of multi‐drug‐resistant bacteria reductions were observed in all the treatments. Inclusion of waste milk at 10% in single stage digester enhances the methane production from dairy manure and could offer added benefit of waste milk treatment and disposal.

Strategic management of livestock-based integrated farming system with zero waste (LEISA) agriculture principle in north Minahasa regency

“…The utilisation of crop waste and livestock manure into biogas is a centre in moving the cycle chain. Biogas with agricultural waste and animal/ livestock manure as raw materials, the potential for its existence is very large so that it has opportunities in its development [6,12,1]. The use of a biogas digester/reactor system has advantages, including reducing the greenhouse effect, reducing unpleasant odours, preventing the spread of disease, producing heat energy, power (mechanical/electrical) and by-products in the form of solid and liquid fertilisers [25,16,24,28].…”