Kualitas Sludge Hasil Ikutan Proses Pembuatan Biogas dari Feses Sapi Perah dengan Berbagai Kadar Air

This research aims to study the influence of water content in the production of biogas from dairy cattle feces to the quality of sludge. The method used in this study is the experimental method using a completely randomized design, with three treatments (P1 = substrate water content of dairy cow feces 40%, P2 = substrate water content of dairy cow feces 60%, P3 = substrate water content of dairy cow feces 80% ) with six replications. Variables measured were levels of N total, P2O5, K2O. The results showed that 1) the treatment did not significantly affect total N concentration, but significantly different levels of P2O5 and K2O, 2) substrate water content 60% (P1) and 80% (P2) generate levels of P2O5 and K2O are highest, ie 1.03% and 1.13% (P2) and 0.84% and 1.00% (P3)