Abstract
<p align="center"><strong>Abstrak</strong></p><p>Ketersediaan energi alternative merupakan tantangan yang harus dihadapi sebagai solusi adanya krisis energi Sumber energi alternatif yang mudah untuk dikembangkan di masyarakat salah satunya adalah biogas, sebagai hasil dekomposisi bahan organik dengan proses fermentasi anaerob. Pada penelitian ini biogas diibuat dari kombinasi antara kotoran sapi dan limbah cair rumah pemotongan ayam sebagai substrat bahan biogas. Biogas yang dihasilkan dapat diketahui komposisi yang optimal, volume biogas terbanyak, dan uji nyala api yang dihasilkan. Penelitian dilaksanakan di Jetis Prenggan, Sidokarto, Godean, Sleman, Yogyakarta. Metode penelitian adalah analisa deskriptif dengan tahapan persiapan digester, pembuatan substrat, proses fermentasi anaerob, analisa pH, analisa suhu, analisa tekanan biogas, analisa volume biogas, dan uji nyala biogas. Variasi yang digunakan adalah campuran kotoran sapi dan limbah cair rumah pemotongan ayam yaitu digeter A (5 liter : 2 liter), digeter B (3,5 liter : 3,5 liter), digester C ( 2 liter : 5 liter) dilakukan pengulangan dengan kapasitas digester 25 liter dan lama waktu fermentasi 30 hari. Hasil yang diperoleh menunjukan bahwa digester B merupakan komposisi yang optimal dan menghasilkan volume biogas tercepat pada hari ke-4 dengan volume tertinggi sebesar 11,32 liter dengan hasil uji nyala api yang berwarna biru.</p><p align="center"><strong><em>Abstrack</em></strong></p><p><em>The energy crisis is a challenge to develop alternative energy sources to support the availability of existing energy sources. One of the energy sources that is easy to develop in the community is biogas. It is the result of decomposition of organic matter through anaerobic fermentation process which produces bio gas in the form of combustible methane gas. This study used cow dung and a mixture of liquid chicken slaughterhouse waste as a substrate for biogas with the aim of knowing the optimal composition, the largest volume of biogas, and the resulting flame test. The research was located in Jetis Prenggan, Sidokarto, Godean, Sleman, Yogyakarta. This is a descriptive analysis with research stages including preparation of anaerobic fermentation digester, manufacture of substrate, fermentation process in the digester, pH analysis, temperature analysis, biogas pressure analysis, biogas volume analysis, and biogas flame test. This study used 3 variations of a mixture of cow dung and liquid waste of a chicken slaughterhouse, namely digeter A (5 liters: 2 liters), digeter B (3.5 liters: 3.5 liters), digester C (2 liters: 5 liters) and repeated. with a digester capacity of 25 liters and a long fermentation time of 30 days. The results obtained show that digester B is the optimal composition and produces the fastest volume of biogas on day 4 with the highest volume of 11.32 liters with a blue flame test result.</em></p>
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