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Abstrak :
Lumpur merupakan produk sampingan utama yang dihasilkan dari proses pengolahan air limbah. Di Indonesia, seringkali lumpur yang dihasilkan belum terolah secara maksimal dan hanya berakhir di TPA. Penelitian ini bertujuan untuk mengolah lumpur aktif IPAL domestik (WAS) guna mengetahui potensi energi dari biogas yang dihasilkan melalui proses anaerobic digestion. Anaerobic digestion (AD) merupakan teknologi pengolahan lumpur yang terbukti efektif untuk pemulihan sumberdaya dan konversi limbah menjadi energi. Eksperimen ini dilakukan menggunakan substrat lumpur IPAL Setiabudi dan inokulum digestat sampah makanan dengan rasio 1:1 (berdasarkan VS). Reaktor yang digunakan merupakan reaktor batch sederhana dan proses berlangsung selama lebih dari 20 hari. Pengujian karakterisasi dilakukan sebelum dan sesudah proses AD untuk parameter pH, COD, TS dan VS, rasio C/N, serta biogas (CH4 dan CO2). Dalam penelitian ini, biogas yang dihasilkan sebanyak 31 ± 2,43 mL CH4/gVS, dengan komposisi biogas yang diukur menggunakan gas chromatography menunjukkan konsentrasi metana sebesar 69,06 ± 1,4%. Sementara itu, nilai energi yang dihasilkan oleh lumpur IPAL tergolong rendah bila dibandingkan dengan gas alam, yaitu sebesar ±0,00224 kWh per m3. Meskipun demikian, hasil ini masih layak untuk diimplementasikan serta diperlukan penelitian lebih lanjut menggunakan rasio S:I yang variatif, penggunaan ko-substrat hingga pre-treatment untuk meningkatkan potensi energi yang dimiliki oleh WAS. ......Sludge is a major byproduct generated from the wastewater treatment process. In Indonesia, the sludge produced often remains inadequately treated and ends up in landfills. This study aims to treat domestic wastewater treatment plant (WWTP) activated sludge (WAS) to determine the energy potential of the biogas produced through the anaerobic digestion process. Anaerobic digestion (AD) is a proven sludge treatment technology for resource recovery and waste-to-energy conversion. This experiment was conducted using sludge from Setiabudi WWTP and food waste digestate inoculum of ratio 1:1 (VS-based). The reactor used was a simple batch reactor and the process was carried out for over 20 days. Characterization tests were performed before and after the AD process for parameters such as pH, COD, TS and VS, C/N ratio, and biogas (CH4 and CO2). In this study, the biogas produced amounted to 31 ± 2.43 mL CH4/gVS, with the biogas composition measured using gas chromatography showing a methane concentration of 69.06 ± 1.4%. Meanwhile, the energy value generated by the WAS was relatively low compared to natural gas, at ±0.00224 kWh per m3. Despite that, these results are still feasible for implementation and further research is needed using varied S:I ratios, co-substrate and pretreatment methods to enhance the energy potential of WAS.

Abstrak :
[ABSTRAK
Paradoks kondisi Sumatera Utara selain sebagai penghasil minyak dan gas juga merupakan provinsi ke-2 terbesar produsen kelapa sawit yang saat ini sedang mengalami krisis energi listrik. Paradigma perhitungan jumlah potensi dari limbah cair kelapa sawit (POME) sebesar 94 MW di Provinsi Sumatera Utara yang seakan-akan bersifat terpusat, kenyataannya besar potensi tersebut tersebar dan umumnya terletak di kawasan remote area sehingga umumnya menjadi tidak ekonomis untuk membangkitkan energi listrik dari lokasi tersebut dan disalurkan kepada pengguna. Alternatif skenario lain yang lebih layak adalah pemanfaatan limbah cair kelapa sawit (POME) menjadi compress biomethane yang dapat digunakan sebagai bahan bakar untuk berbagai kebutuhan yang memiliki tingkat probabilitas kelayakan NPV>0 sebesar 94,87% dan IRR>suku bunga sebesar 95,18% lebih tinggi dibandingkan skenario pemanfaatan dalam bentuk listrik.

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ABSTRACT
The paradox of North Sumatra conditions other than as a producer of oil and gas is also the 2nd largest provincial producer of palm oil is currently experiencing a power crisis. Paradigm calculation of the potential amount of palm oil mills effluent (POME) by 94 MW in the province of North Sumatra that seemed to be centralized, in fact great potential spread and are generally located in remote areas that generally becomes uneconomical to generate electrical energy from the site and distributed to users. Another alternative scenario more feasible is the use of palm oil mills effluent (POME) into compressed biomethane which can be used as fuel for various needs that have a probability level of feasibility NPV> 0 by 94.87% and IRR> interest rate of 95.18% higher than the utilization scenarios in the form of electricity., The paradox of North Sumatra conditions other than as a producer of oil and gas is also the 2nd largest provincial producer of palm oil is currently experiencing a power crisis. Paradigm calculation of the potential amount of palm oil mills effluent (POME) by 94 MW in the province of North Sumatra that seemed to be centralized, in fact great potential spread and are generally located in remote areas that generally becomes uneconomical to generate electrical energy from the site and distributed to users. Another alternative scenario more feasible is the use of palm oil mills effluent (POME) into compressed biomethane which can be used as fuel for various needs that have a probability level of feasibility NPV> 0 by 94.87% and IRR> interest rate of 95.18% higher than the utilization scenarios in the form of electricity.]