Abstract

This study aims to identify the performance ofbiogas made by co-digesting dairy cattle feces and cattle rumenwaste. As we know, greenhouse gas emissions from the livestocksector are one of the main factors causing global warming andclimate change. This sector accounts for about 14.5% of the totalgreenhouse gas emissions in the world. One of the contributorsto emissions from this sector comes from cattle livestock. Theconcept of renewable energy can be one of the solutions toreduce the impact of greenhouse gas emissions from thelivestock sector. The study used four treatments with differentraw material mixtures for biogas. P0 consists of dairy cattle fecesonly; P1 consists of 75:25 of dairy cattle feces to cattle rumenwaste; P2 consists of 50:50 of dairy cattle feces to cattle rumenwaste; and P3 consists of 25:75 of dairy cattle feces to cattlerumen waste. Biogas is measured by CH<sub style="text-wrap-mode: wrap;">4</sub> production and fluxresults. The results showed that the co-digestion of rumen wastewith dairy cattle feces increased CH<sub style="text-wrap-mode: wrap;">4</sub> production 2-3 timeshigher than rumen waste only, and it depended on the ratio ofdairy cattle feces to rumen waste. We concluded that rumenwaste can be an alternative raw material for biogas production.Optimal biogas production from rumen waste can be achievedif rumen waste is digested together with dairy cow feces (codigestion)with a composition of 25:75. Optimal conditions referto both results in CH₄ yield and flux differing significantly fromthe digestion of rumen waste alone.