Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
The performance of anaerobic digestion (AD) to process organic fraction of municipal solid waste (OFMSW) can be improved with various pre-treatments. Mechanical pre-treatments, mainly chopping, have shown to be the most economical and relatively effective method to increase contact between the substrate and microorganisms. The purpose of this research was to analyze the effect of OFMSW particle size on CH4 gas formation in a laboratory-scale Biochemical Methane Potential (BMP) assay. The research was conducted for 35 days at a temperature of 35°C with three sizes of OFMSW co-digested with cow manure. OFMSW with particle sizes of 10-13 mm, 4.76-10 mm, and 2-4.76 mm produce CH4 gas with an average of 114.7+14.7 ml, 101.7+0.5 ml, and 110.9+10.8 ml, respectively, while methane yield was 0.277 L CH4/g VS, 0.208 L CH4/g VS, and 0.229 L CH4/g VS, respectively. Particle size is more likely to have an influence on the hydrolysis and acidogenesis processes, as demonstrated by the significant difference of VFA value, but not on the biogas potential. Particle sizes of 13-15 mm produce 19.25 mg VFA/L, while the size range of 2-4.76 mm produces 118.1 mg VFA/L.

Abstrak :
Peningkatan konsentrasi karbon dioksida dapat menyebabkan berbagai masalah di bumi. Biogas menjadi salah satu sumber energi terbarukan yang dapat menggantikan bahan bakar fosil. Biogas sebagian besar terdiri atas gas metana (CH4) dan gas karbon dioksida (CO2). Keberadaan gas karbon dioksida ini dapat menyebabkan korosi, pengendapan, dan kerusakan pada mesin. Salah satu metode untuk memisahkan karbon dioksida adalah adsorpsi menggunakan material metal-organic framework (MOF). Penambahan gugus polar seperti amina ke dalam secondary building unit (SBU) menghasilkan peningkatan kapasitas adsorpsi suatu gas. Penelitian ini bertujuan untuk mengidentifikasi karakteristik dari Ni-MOF-NH2 termodifikasi etilendiamin dan sifat adsorpsinya. Modifikasi etilendiamin ke dalam Ni-MOF-NH2 berhasil dilakukan dengan metode post-synthesis yang dapat dibuktikan dengan hasil karakterisasi FTIR, XRD, dan SAA. Hasil uji adsorpsi gas menunjukkan Ni-MOF-NH2 termodifikasi etilendiamin memiliki kapasitas adsorpsi yang lebih besar dibandingkan dengan Ni-MOF-NH2 masing-masing sebesar 21,975 mmol/g dan 9,05 mmol/g. Variasi suhu yang dilakukan menunjukkan bahwa semakin tinggi suhu menyebabkan semakin besar kapasitas adsorpsinya. Selektivitas dari terhadap gas CO2 dari adsorben Ni-MOF-NH2 termodifikasi etilendiamin lebih besar dibandingkan dengan Ni-MOF-NH2 ......An increase in the concentration of carbon dioxide can cause various problems on earth. Biogas is a renewable energy source that can replace fossil fuels. Biogas mostly consists of methane gas (CH4) and carbon dioxide gas (CO2). The presence of carbon dioxide gas can cause corrosion, deposition, and damage to the engine. One method for separating carbon dioxide is adsorption using a metal-organic framework (MOF) material. The addition of polar groups such as amines into the secondary building unit (SBU) resulted in an increase in the adsorption capacity of a gas. The aim of this research to identify the characteristics of ethylenediamine-modified Ni-MOF-NH2 and its adsorption properties. The modification of ethylenediamine into Ni-MOF-NH2 was successfully carried out as evidenced by the results of FTIR, XRD, and SAA characterization. The gas adsorption test results showed that ethylenediamine-modified Ni-MOF-NH2 had a higher adsorption capacity than Ni-MOF-NH2 of 21.975 mmol/g and 9.05 mmol/g, respectively. The temperature variations carried out indicate that the higher the temperature, the greater the adsorption capacity. The selectivity of ethylenediamine-modified Ni-MOF-NH2 for CO2 gas is greater than that of Ni-MOF-NH2