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Abstrak :
[Sekitar 58,9% penduduk Indonesia bergantung pada tangki septik untuk mengolah tinja, namun 90% dari IPLT yang ada tidak beroperasi dengan baik. Anaerobic digestion (AD) adalah teknologi alternatif yang dapat menggantikan sistim saat ini, namun dibutuhkan inokulum yang sesuai agar dapat mengolah lumpur tinja. Penelitian ini bertujuan untuk mengetahui pengaruh pencampuran inokulum cairan rumen sapi (R) dan feses sapi (F) ke dalam lumpur tinja, dan penambahan co-substrat serbuk kayu (SK) dan daun kering (DK) terhadap pembentukan gas metana. Metode yang digunakan adalah biochemical methane potential (BMP). Batasan yang digunakan adalah massa inkubasi 28 hari, suhu inkubator 35oC, rasio substrat/inokulum (RSI) 1:2, sampel triplo, dan volume efektif 50%. Substrat lumpur tinja memiliki karakteristik COD 8,99 g/L, TS 8,1 g/L, VS 7,1 g/L, dan C/N 15,2. Hasil kombinasi substrat lumpur tinja dengan co-substrat SK dan DK menghasilkan nilai C/N 24,6 dan 16,8. Dari hasil uji BMP 28 hari, potensi gas metana RSK dan RDK adalah 60,5 dan 51,5 mLCH4/gVS. Kombinasi feses sapi, FSK dan FDK, menghasilkan 1,7 dan 37,7 mLCH4/gVS. Kesimpulan dari penelitian ini adalah inokulum (R) memiliki potensi menghasilkan gas metana lebih besar ketimbang (F), dan campuran co-substrat tidak memiliki pengaruh yang signifikan terhadap pembentukan gas metana. ......About 58,9% of Indonesian‟s people rely on septic tank to process fecal waste, but 90% of fecal treatment facilities doesn't function properly. Anaerobic Digestion (AD) is an alternative technology than could replace the existing system, but it requires a compatible inoculum to digest fecal sludge waste. This research aims to determine the effects of adding inoculum from cow's rumen fluid (R) and cow‟s feces (F) into fecal sludge, and also determine the effect of combination of sawdust (SK) and dried leaves (DK) to the methane gas production. The biochemical methane potential (BMP) method is used in this research. The research frameworks consist of 28 days incubation period, incubator temperature of 35oC, 1:2 substrate-to-inoculum ratios (RSI), triplicate sample and 50% effective volume. The sewage sludge characteristics are COD 8,99 g/L, TS 8,1 g/L, VS 7,1 g/L and C/N 15,2. The combination of fecal sludge substrate with sawdust co-substrate and dried leaves yields C/N value of 24,6 and 16,8 respectively. The results of this research are the combination of rumen with RSK and RDK yields 60,5 dan 51,5 mLCH4/gVS respectively. The combination of cow feces with FSK and FDK yields 1,7 dan 37,7 mLCH4/gVS. This experiment concluded that inoculum (R) has the highest methane production compare to (F) and the combination of co-substrate (SK) and (DK) has little influence in methane gas production., About 58,9% of Indonesian‟s people rely on septic tank to process fecal waste, but 90% of fecal treatment facilities doesn‟t function properly. Anaerobic Digestion (AD) is an alternative technology than could replace the existing system, but it requires a compatible inoculum to digest fecal sludge waste. This research aims to determine the effects of adding inoculum from cow‟s rumen fluid (R) and cow‟s feces (F) into fecal sludge, and also determine the effect of combination of sawdust (SK) and dried leaves (DK) to the methane gas production. The biochemical methane potential (BMP) method is used in this research. The research frameworks consist of 28 days incubation period, incubator temperature of 35oC, 1:2 substrate-to-inoculum ratios (RSI), triplicate sample and 50% effective volume. The sewage sludge characteristics are COD 8,99 g/L, TS 8,1 g/L, VS 7,1 g/L and C/N 15,2. The combination of fecal sludge substrate with sawdust co-substrate and dried leaves yields C/N value of 24,6 and 16,8 respectively. The results of this research are the combination of rumen with RSK and RDK yields 60,5 dan 51,5 mLCH4/gVS respectively. The combination of cow feces with FSK and FDK yields 1,7 dan 37,7 mLCH4/gVS. This experiment concluded that inoculum (R) has the highest methane production compare to (F) and the combination of co-substrate (SK) and (DK) has little influence in methane gas production.]

Abstrak :
Gas alam merupakan salah satu energi alternatif dalam memenuhi kebutuhan energi di Indonesia. Teknologi penyimpanan gas alam umumnya menggunakan CNG dan LNG. Teknologi tersebut memiliki kekurangan yang menyebabkan adanya masalah keamanan dan tidak ekonomis. Kekurangan ini dapat diatasi dengan menerapkan teknologi Adsorbed Natural Gas (ANG) yang menggunakan adsorben berupa karbon aktif yang terbuat dari limbah plastik jenis Poltylene terepthalate (PET). Pada penelitian ini, karbon aktif dari limbah PET melalui tahapan karbonisasi dan aktivasi. Karbonisasi dilakukan pada suhu 500 oC, aktivasi kimia dengan KOH 4 M, dan aktivasi fisika dengan gas N2 100 mL/menit. Untuk meningkatkan kemampuan adsorpsi dilakukan impregnasi dengan menggunakan Mg(NO3).6H2O dengan variasi konsentrasi 0,5%, 1%, dan 2%. Karbon aktif dengan karakteristik terbaik adalah karbon aktif termodifikasi MgO 1% b/b dengan bilangan iodin sebesar 984,51 mg/g dan luas permukaan sebesar 979,18 m2/g. Karbon aktif yang dihasilkan diuji kapasitasnya dalam menyimpan gas metana. Kapasitas adsorpsi terbesar didapatkan oleh karbon aktif termodifikasi MgO 1% b/b pada suhu 28 oC dan tekanan 9 bar yang mampu mencapai 0,148 kg/kg dengan desorpsi mencapai 76,34%. ......Natural gas is an alternative energy that meets energy needs in Indonesia. Natural gas storage technology generally uses CNG and LNG. This technology has shortcomings that cause security problems and could be more economical. This deficiency can be overcome by implementing Adsorbed Natural Gas (ANG) technology, which uses an adsorbent in the form of activated carbon made from polyethylene terephthalate (PET) plastic waste. This research shows activated carbon from PET waste through carbonization and activation stages. Carbonization was carried out at a temperature of 500 oC, chemical activation with 4 M KOH, and physical activation with N2 gas 100 mL/minute. To increase the adsorption capacity, impregnation was carried out using Mg(NO3).6H2O with varying concentrations of 0.5%, 1%, and 2%. The activated carbon with the best characteristics is MgO 1% w/w modified activated carbon with an iodine number of 984.51 mg/g and a surface area of 979.18 m2/g. The resulting activated carbon was tested for its capacity to store methane gas. The largest adsorption capacity was obtained by 1% w/w MgO modified activated carbon at a temperature of 28 oC and a pressure of 9 bar, which reached 0.148 kg/kg with desorption reaching 76.34%.