Biogas is a raw material utilized to produced biogas. Biogas is renewable energy source produced by the anaerobic activity of organic matter through the fermentation process. Quality of biogas is determined by its main composition, such as methane (CH4). In addition, the composition of biogas also contains impurities such as unburnt carbon dioxide (CO2) so that it reduces the heating value, hydrogen sulfide (H2S) and water vapor (H2O) which are corrosive as well as Nitrogen (N2). Adsorption method on the impurity compositions can be used to improve biogas quality. This research used a column purifier containing four adsorbents in the form of calcium hydroxide Ca(OH)2, iron gram (Fe2(O3)), zeolite and activated carbon with three volume variations 600 cm3, 900 cm3 and 1200 cm3. The results of biogas testing using gas chromatography showed that the best quality obtained from the 1200 cm3 volume of adsorbent. Methane content was increased up to 17.985% and the impurity gases were decreased, such as carbon dioxide in as much as 18.15%, hydrogen sulfide and water vapor in as much as 0.182%. The heat produced by unpurified biogas was 1518.312 kJ/m3 and the highest heating value after purification was 2108.22 kJ/m3. The biogas combustion resulted in a dominant blue flame color.The most optimum effectiveness of the technology resulted in an increase of the methane content up to 64.275%. Based on this research, the utilization of column purifier with the adsorption method was able to improve the quality of biogas
Jumlah masyarakat Indonesia setiap tahun mengalami peningkatan, peningkatan jumlah masyarakat akan mengakibatkan meningkatnya kebutuhan konsumsi energi seperti bahan bakar untuk memasak sehingga dibutuhkan energi alternatif yang berkelanjutan yang mampu memenuhi kebutuhan konsumsi energi. Energi alternatif yang dapat digunakan oleh masyarakat sebagai bahan bakar pengganti bahan bakar konvensional untuk memasak adalah biogas. Biogas merupakan energi alternatif berfasa gas yang dihasilkan dari kotoran hewan sehingga dapat diperbarui (renewable) secara berkelanjutan, biogas termasuk energi yang ramah lingkungan dan tidak beracun. Produksi biogas memiliki sisa slurry yang dapat mencemari lingkungan, diperlukan mengkarakterisasi sisa slurry pada produksi biogas berbahan kotoran sapi. Penelitian ini menggunakan perbandingan campuran air dan kotoran sapi sebesar 1: dengan menggunakan jenis reaktor tangki 1000 liter, pada saat produksi biogas dilakukan pengukuran tekanan biogas, volume slurry, pengukuran temperatur, dan pengukuran pH. Data yang didapatkan akan dilakukan analisis karakteristik sisa slurry pada biogas. Pada hasil penelitian ini didapatkan volume slurry selama produksi yaitu 900-980 liter dengan nilai pH rata-rata 6-7, hasil unsur hara sisa slurry cair pada penelitian ini belum dapat langsung digunakan sebagai pupuk cair organik perlu ditambahkan substrat lainnya agar dapat menaikkan unsur hara N, P, dan K yang terkandung pada sisa slurry cair tetapi untuk sisa slurry padat dapat digunakan sebagai pupuk kompos karena telah memenuhi standar kualitas pupuk kompos. The number of Indonesian people is increasing every year, and an increase in the number of people will increase the need for energy consumption such as fuel for cooking so sustainable alternative energy is needed that can meet energy consumption needs. The alternative energy that can be used by the community as a substitute for conventional fuel for cooking is biogas. Biogas is alternative energy in the gas phase produced from animal waste so that it can be renewed sustainably, biogas is environmentally friendly and non-toxic energy. Biogas production has residual slurry that can pollute the environment, it is necessary to characterize the remaining slurry in biogas production made from cow dung. This study uses a mixture of water and cow dung ratio of 1: using a 1000 liter tank reactor type, at the time of biogas production, biogas pressure, slurry volume, temperature measurement, and pH measurements are measured. The data obtained will be analyzed for the characteristics of the residual slurry in biogas. In the results of this study, the volume of slurry during production was 900-980 liters with an average pH value of 6-7, the results of the remaining nutrients from the liquid slurry in this study could not be directly used as organic liquid fertilizer, it was necessary to add other substrates to increase the nutrients. N, P, and K are contained in the remaining liquid slurry but the remaining solid slurry can be used as compost because it meets the quality standards of compost fertilizer.
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