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Libertus Darus
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Biochemistry, Genetics & Molecular Biology Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Immunology & microbiology Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Effect of Substrate Concentration to Anode Chamber Performance in Microbial Electrolysis Cell Libertus Darus
Indonesian Journal of Biotechnology Vol 16, No 1 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (796.268 KB) | DOI: 10.22146/ijbiotech.7832

Abstract

Microbial electrolysis is a promising process for bio-hydrogen production which might be implemented in waste water treatment in a near future. Unfortunately substrate could be converted into methane by acetoclastic methanogens and will reduce the coulombic efficiency (CE). The research objective was to study the competition between electrogens and methanogens for substrate in a continuous Microbial Electrolysis Cell (MEC).The competition was studied in relation to controlling acetate influent concentration (Cin) from 35 to 1 mM with a fixed anode potential -350 mV, by assessing activity of electrogens as current density (CD), activity of acetoclastic methanogens as methanogenic consumed acetate (Cmeth), and CE and by measuring anolyte protein content to confirm a steady state condition. Controlling Cin from 35 to 1 mM resulted in tendency of both CD and Cmeth to decrease and CE to increase. At decreasing Cin from 35 to 5 mM which left excess acetate concentration in anolyte, the CEs were between 36.4% and 75.3%. At further decreasing Cin to 1 mM the acetate concentration was limited (Cef 0 mM), but the CE only reached 95.8%. Methanogenesis always occur and electrogens were not able to outcompete the acetoclastic methanogens even though the substrate concentration was limited.Keywords : microbial electrolysis cell, bio-hydrogen, metanogenesis, substrate concentration
Pengaruh Variasi Waktu Dan Jenis Limbah Padat Kelapa Sawit Pada Pirolisis Menjadi Asap Cair Sahmoen Gunawan Bancin; Amaliyah Rohsari Indah Utama; Libertus Darus
eProceedings of Engineering Vol 8, No 5 (2021): Oktober 2021
Publisher : eProceedings of Engineering

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Abstract

Kelapa sawit menjadi sektor perkebunan utama di Kalimantan Barat dan penyumbang devisa terbesar di Indonesia. Industri ini semakin berkembang dalam produksinya diiringi pertambahan volume limbah. Diantaranya Limbah padat belum dimanfaatkan secara optimal dan dapat diolah (dipirolisis) menjadi produk bernilai ekonomis (asap cair) yang selanjutnya menjadi bahan baku kimia dan bahan bakar. Pada penelitian pirolisis limbah padat kelapa sawit menjadi asap cair menggunakan variabel waktu operasi (60, 90, 120, 150, 180 menit) dan jenis limbah padat (cangkang, pelepah dan tandan kosong) pada suhu tetap 350°C. Hasil pirolisis (asap cair) dengan rendemen tertinggi 17,43% terdapat pada pelepah dengan lama pirolisis yaitu 120 menit dengan pH terendah 2,66. Total fenol asap cair yang tertinggi dihasilkan oleh cangkang yaitu 15,35%. Hal tersebut membuktikan jika semakin lama waktu pirolisis semakin tinggi juga nilai rendemen asap cair, begitu pula variasi limbah padat mempengaruhi nilai pH dan fenol asap cair. Kata Kunci: Asap Cair, Limbah Kelapa Sawit, Pirolisis, Rendemen
Co-Authors Amaliyah Rohsari Indah Utama Sahmoen Gunawan Bancin