Heidirahman, Puguh (2019) Pengaruh Penambahan Ekstrak Rumput Laut Cokelat Sargassum Polycystum Terhadap Stabilitas Biodiesel. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penerapan biodiesel sebagai bahan bakar menimbulkan beberapa permasalahan. Karakteristik biodiesel berkaitan dengan kandungan asam lemak tidak jenuh yang tinggi membuat biodiesel rentan terjadi oksidasi. Oksidasi biodiesel dipengaruhi beberapa faktor seperti kontak udara, kontak cahaya, suhu dan kandungan air selama masa penyimpanan biodiesel. Kandungan air dapat menjadi media pembentukan mikroba yang dapat mendegradasi biodiesel. Proses oksidasi pada biodiesel menghasilkan senyawa asam yang mengakibatkan kenaikan nilai bilangan asam. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan ekstrak rumput laut cokelat Sargassum polycystum terhadap stabilitas biodiesel. Aktivitas penghambatan oksidasi diamati saat penyimpanan selama enam minggu dengan pengujian nilai bilangan asam total setiap dua minggu. Pengamatan faktor pendegradasi biodiesel dilakukan dengan pengujian Total Plate Count (TPC) untuk mengetahui pertumbuhan mikroba dalam biodiesel. Pengamatan dilakukan pada perlakuan biodiesel dengan penambahan ekstrak rumput laut cokelat pada konsentrasi 500 ppm dan 1000 ppm, biodiesel dengan penambahan antioksidan sintetis BHT (butylated hydroxytoluene) pada konsentrasi 1000 ppm, dan biodiesel tanpa penambahan. Biodiesel dengan penambahan ekstrak rumput laut cokelat pada konsentrasi 1000 ppm menunjukkan aktivitas penghambatan laju degradasi terbaik.
Kata kunci : biodiesel, BHT, ekstrak rumput laut cokelat, stabilitas biodiesel
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The application of biodiesel as fuel bring several problems. Characteristics of biodiesel related to high content of unsaturated fatty acids make biodiesel suspectible to oxidation. Biodiesel oxidation is influenced by several factors such as air contact, light contact, temperature and water contamination during the biodiesel storage period. Water contamination can lead to microbial formation that can degrade biodiesel. The oxidation process on biodiesel produces acidic compounds which increase total acid number of biodiesel. This study investigates the effect of brown macro-algae Sargassum polycystum extract biodiesel stability. Oxidation inhibition activity was observed during storage for six weeks by testing the total acid number every two weeks. Observation of biodiesel degradation factor was carried out by testing Total Plate Count (TPC) to determine microbial growth in biodiesel. Observations were made on the treatment of biodiesel with the addition of brown seaweed extract at concentrations of 500 ppm and 1000 ppm, biodiesel with the addition of synthetic antioxidant BHT (butylated hydroxytoluene) at a concentration of 1000 ppm, and biodiesel without addition. Biodiesel doped with brown seaweed extract at a concentration of 1000 ppm shows the best improvement of biodiesel stability.
Keywords : biodiesel, BHT, brown macroalgae extract, biodiesel stability
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | biodiesel, antioksidan, rumput laut cokelat, sargassum, stabilitas biodiesel |
| Subjects: | T Technology > TJ Mechanical engineering and machinery V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering |
| Divisions: | Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis |
| Depositing User: | Puguh Heidirahman |
| Date Deposited: | 03 Jul 2024 02:49 |
| Last Modified: | 03 Jul 2024 02:49 |
| URI: | http://repository.its.ac.id/id/eprint/69314 |
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