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Abstrak :
Kinerja anaerobic digestion (AD) sebagai solusi teknologi pengolahan sampah organik dapat ditingkatkan dengan pra-pengolahan mekanis, pencacahan. Tujuan penelitian adalah menganalisis pengaruh ukuran partikel sampah organik terhadap potensi pembentukan gas CH4 serta menganalisis ukuran partikel optimumnya dalam skala laboratorium BMP. Parameter yang diuji yaitu TS, VS, COD, C/N, VFA, pH, dan alkalinitas. Penelitian dilakukan selama 35 hari dengan suhu 35°C. Hasil penelitian menunjukkan bahwa ukuran partikel memiliki pengaruh pada proses hidrolisis, tetapi tidak begitu berpengaruh pada proses metanogenesis. Partikel berukuran 13-10 mm menghasilkan gas CH4 dengan rata-rata 114,7 mL atau sebesar 72,82% dari biogas dengan potensi 0,277 L CH4/gr VS, ukuran 10-4,76 mm dengan rata-rata 101,7 mL atau sebesar 76,04% dari biogas memiliki potensi 0,208 L CH4/gr VS, dan ukuran 4,76-2 mm dengan rata-rata 110,9 mL atau sebesar 75,14% dari biogas memiliki potensi 0,229 L CH4/gr VS. Perbedaan ukuran partikel nyatanya memiliki pengaruh yang besar dalam proses hidrolisis, hal ini dibuktikan dari perbedaan nilai VFA yang dihasilkan secara signifikan. Partikel 13-10 mm menghasilkan VFA sebanyak 19,25 mg/L, sementara partikel 4,76-2 mm menghasilkan VFA sebanyak 118,1 mg/L. Dengan demikian, dapat disimpulkan bahwa ukuran partikel memberi pengaruh besar pada laju hidrolisis dan asidogenesis, namun tidak begitu berpengaruh pada potensi pembentukan gas CH4. Melihat kepada volume gas CH4 yang dihasilkan maupun potensi gas CH4 yang dapat tercipta dari VS, tidak ada satupun rentang partikel yang lebih unggul dibandingkan yang lain, sehingga tidak terdapat ukuran partikel yang optimum dalam pembentukan gas CH4. Tetapi jika melihat kepada aspek biaya dan energi yang diperlukan untuk mencacah, maka partikel dengan rentang 13-10 mm merupakan ukuran yang paling menguntungkan.

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Performance anaerobic digestion (AD) of organic waste processing technology solutions can be improved by pre-mechanical processing, chopping. The research objective was to analyze the effect of particle size of organic waste to the potential formation of CH4 and analyze the optimum particle size in a laboratory scale BMP. The parameters examined are TS, VS, COD, C/N, VFA, pH, and alkalinity. The study was conducted for 35 days with a temperature of 35°C. The results showed that the particle size has an influence on the process of hydrolysis, but not so influential in the process of methanogenesis. Particles size 13-10 mm produce CH4 gas with an average of 114.7 mL or by 72.82% of the biogas and potential of 0.277 L CH4 / g VS, size 10-4.76 mm with an average of 101.7 mL or amounting to 76.04% of the biogas has the potential of 0.208 L CH4 / g VS, and size 4.76-2 mm with an average of 110.9 mL or by 75.14% of the biogas has the potential of 0.229 L CH4 / g VS. Differences in particle size in fact has a great influence in the process of hydrolysis, it is evident from the difference in value generated significant VFA. VFA from particles 13-10 mm produce as much as 19.25 mg / L, while particles of 4.76-2 mm produce VFA as much as 118.1 mg / L. Thus, it can be concluded that the particle size to give a major influence on the rate of hydrolysis and asidogenesis, but not so influential on the potential formation of CH4. Looking at the volume of gas produced and the potential CH4 gas that can be created from VS, none of the range of particles that are superior to the others, so there is no optimum particle size in the formation of CH4. But if you look at the aspect of cost and energy needed for chopping, then the particles with a size range of 13-10 mm is the most profitable.

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.