Pengaruh variasi asam dalam fermentasi biomassa berbahan baku alga spirogyra sp. Terhadap kadar etanol. Telusuri pengaruh variasi jenis dan konsentrasi asam pada fermentasi biomassa alga Spirogyra sp. untuk produksi bioetanol sebagai bahan bakar alternatif. Temukan hasilnya!
Bahan Bakar Minyak (BBM) merupakan salah satu sumber energi penting yang digunakan oleh seluruh masyarakat dunia disamping energi listrik. Keberadaan bahan bakar minyak semakin lama semakin menipis bahkan pada tahun 2025 diperkirakan ketersediaan minyak bumi akan habis. Sebagai pengganti BBM, saat ini mulai dikembangkan Bahan Bakar Nabati (BBN). Saat ini pengembangan bioetanol berpusat pada bahan pangan yang banyak mengandung glukosa, seperti jagung dan kedelai. Jika bahan bakar nabati terus menerus dibuat dari bahan pangan, maka akan terjadi persaingan antara penyediaan pangan dan energi. Alga memiliki prospek yang sangat baik untuk dikembangkan sebagai bahan baku bioetanol. Penelitian ini bertujuan untuk mengetahui pengaruh variasi jenis dan konsentrasi asam terhadap kadar etanol yang dihasilkan dari fermentasi alga Spyrogyra sp. Jenis penelitian ini adalah penelitian eksperimen dengan 2 jenis asam, 3 variasi konsentrasi, dan 3 kali pengulangan. Tahap penelitian yang dilakukan adalah mulai dari preparasi bahan baku, sterilisasi alat, hidrolisis alga, fermentasi, destilasi dan terakhir adalah penentuan kadar etanol. Berdasarkan hasil penelitian yang dilakukan, adanya variasi jenis dan konsentrasi asam tidak berpengaruh terhadap kadar etanol yang dihasilkan dari fermentasi alga Spirogyra sp. Tidak adanya pengaruh pengaruh jenis dan konsentrasi asam terhadap kadar etanol yang dihasilkan disebabkan oleh beberapa faktor. Fermentasi alga Spirogyra sp. menggunakan Saccaromicces cerevisei selama 10 hari menghasilkan etanol tertinggi 7,537% pada perlakuan hidrolisis HCL 0,5 M, sedangkan kadar etanol terendah dihasilkan dari fermentasi alga Spirogyra sp. menggunakan jenis sam HCl 0,1 M.Kata kunci: etanol, Spirogyra sp., variasi asam.
This study addresses a critical global challenge: the depletion of fossil fuels and the urgent need for sustainable energy alternatives. The authors wisely pivot away from traditional food-based feedstocks like corn and soybeans, which present a "food-versus-fuel" dilemma, by investigating the promising potential of *Spirogyra sp.* algae as a raw material for bioethanol production. The specific objective of this experimental work was to evaluate the influence of varying acid types and concentrations during the hydrolysis phase on the ultimate ethanol yield from *Spirogyra sp.* fermentation, contributing to the development of more sustainable biofuel sources. The methodology employed utilized an experimental design with two types of acid at three distinct concentrations, each replicated three times. The research followed a standard sequence from feedstock preparation and sterilization through algal hydrolysis, fermentation (using *Saccharomyces cerevisiae* for 10 days), distillation, and finally, ethanol content determination. While the experimental setup was clearly outlined, the primary finding presented in the abstract is notable: the authors conclude that "adanya variasi jenis dan konsentrasi asam tidak berpengaruh terhadap kadar etanol yang dihasilkan." However, the abstract then reports a specific highest ethanol yield of 7.537% under hydrolysis with HCl 0.5 M and a lowest yield when using HCl 0.1 M. The strength of this research lies in its timely contribution to the bioenergy field by exploring a non-food, rapidly renewable feedstock, and the experimental design appears sound in its basic steps. However, the abstract's core finding regarding the non-influence of acid variations, juxtaposed with numerically distinct highest and lowest ethanol yields, is a significant point of concern for a reviewer. This suggests either a lack of statistical significance despite observed numerical differences, or an incomplete interpretation of the data. For a full publication, the authors would need to thoroughly discuss the statistical analysis supporting the "no effect" conclusion, elaborate on the "several factors" attributed to this lack of influence, and clearly identify the second acid type used. Future work could benefit from exploring a broader range of hydrolysis conditions, including enzymatic methods, and deeper analysis into the biochemical mechanisms at play within *Spirogyra sp.* that might render it less sensitive to acid variation under these conditions, ultimately enhancing the reproducibility and impact of the findings.
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