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Bioethanol Generation Through the Fermentation Process of Pineapple and Black Grape Utilizing Saccharomyces cerevisiae and Saccharomyces bayanus Ika Nawang Puspitawati; Sintha Soraya Santi; Kindriari Nurma Wahyusi; Sani
Nusantara Science and Technology Proceedings 4th International Conference Eco-Innovation in Science, Engineering, and Technology
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2023.3609

Abstract

Bioethanol is an alcohol molecule that is derived through the process of fermentation using microorganisms. Fermentation is a biological process in which microbes metabolize fermentable sugars as a source of nourishment, resulting in the production of ethyl alcohol and various other byproducts. These microbes commonly metabolize 6-carbon carbohydrates, with glucose being one of the most prevalent examples. Hence, biomass materials rich in glucose or glucose precursors are the most readily convertible to bioethanol. The examination of bioethanols employing Saccharomyces bayanus demonstrated notable disparities in the obtained alcohol concentration. The utilization of Saccharomyces bayanus yeast, in the absence of sugar supplementation, for the conversion of grape into bioethanol, yielded a modest alcohol concentration of merely 14%. In the context of bioethanol production, pineapple was utilized as a substrate, wherein 4 grams of Saccharomyces bayanus yeast and an additional 70 grams of sugar were introduced as a nutritional supply to support yeast growth and metabolism. The present fermentation procedure resulted in an alcohol concentration of around 21%.
PENENTUAN KONDISI TERBAIK PENYISIHAN ION Ca2+ DAN Mg2+ DARI AIR LAUT MENGGUNAKAN NATRIUM KARBONAT (Na2CO3) DAN AMONIUM HIDROKSIDA (NH4OH) Septianingsih, Dilla; Zulianti, Mei Fifa; Dewati, Retno; Sani, Sani
JURNAL INTEGRASI PROSES Vol 14, No 1 (2025)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v14i1.32090

Abstract

Air laut mengandung beragam ion logam, terutama ion kalsium (Ca2+) dan magnesium (Mg2+) yang menyebabkan masalah di berbagai industri, seperti pembentukan kerak pada peralatan industri dan pengolahan air minum.  Penelitian ini bertujuan untuk menentukan kondisi terbaik dalam penghilangan ion Ca2+ dan Mg2+ menggunakan Na₂CO₃ sebagai agen pengikat kalsium dan magnesium dan penambahan NH4OH sebagai bahan pengikat magnesium pada tahap kedua. Proses penghilangan dilakukan melalui reaksi pengendapan dengan variasi konsentrasi Na₂CO₃ yaitu 0,1, 0,2, 0,3, 0,4, dan 0,5 M, serta suhu operasi 30, 45, 60, 75, dan 90 °C. Waktu pengadukan ditetapkan selama 5 menit, diikuti dengan pengendapan selama 1 jam. Konsentrasi NH4OH ditetapkan pada 6,49 M berdasarkan hasil perhitungan stoikiometri. Kadar ion Ca²⁺ dan Mg²⁺ sebelum dilakukan perlakuan dan sesudah perlakuan dianalisis menggunakan metode titrasi kompleksometri dan atomic absorption spectrometry (AAS). Hasil penelitian menunjukkan bahwa peningkatan konsentrasi Na₂CO₃ dan suhu operasi berbanding lurus dengan persen penyisihan ion Ca²⁺ dan Mg²⁺. Analisis statistik menggunakan ANOVA dua arah juga menunjukkan nilai p < 0,05. Kondisi terbaik didapatkan pada penambahan natrium karbonat pada konsentrasi 0,5 M dan suhu 90 °C, dengan persen penyisihan  ion Ca²⁺ mencapai 97,85% dan ion Mg²⁺ sebesar 96,91%. Hasil penyisihan tersebut belum memenuhi standar SNI, karena kadar ion Ca2+ dan ion Mg2+ didapatkan sebesar 180,351 mg/L dan 182,288 mg/L, sedangkan standar SNI pada air minum kadar Ca2+ sebesar 10 mg/L dan kadar Mg2+ sebesar 150 mg/L. Penelitian ini mendukung pengembangan pra-pengolahan air laut yang lebih efisien dengan menurunkan kadar ion Ca²⁺ dan Mg²⁺ dalam industri air minum.
Synthesis of Aragonite Polymorphs from Five Types of Sea Shells by Carbonation Method Prasetyo Hadi; Wahyu Hidayah; Sani Sani; Srie Muljani
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v9i3.6998

Abstract

Shell waste accumulates along the coastal areas of Surabaya and Sidoarjo, with various types of shells including blood shells, green shells, feather shells, kampak shells, and batik shells. Currently, the waste from these shells is not being utilized optimally. Marine shell waste contains more than 95% calcium carbonate (CaCO3), making it suitable for the production of aragonite crystals, which can serve as raw materials for applications such as bone regeneration, paper manufacturing, and as fillers in rubber and plastics. The objective of this research is to synthesize aragonite from five types of marine shells and to investigate the effect of carbonation temperature on the percentage of aragonite formation. The method employed for synthesizing aragonite crystals is carbonation. Initially, the CaCO3 derived from marine shells is calcined at 900°C to produce calcium oxide (CaO). This calcium oxide is then dissolved in hydrochloric acid (HCl) to form calcium chloride (CaCl2). Subsequently, sodium hydroxide (NaOH) is added to CaCl2, and carbon dioxide (CO2) gas is bubbled through the solution to precipitate CaCO3 along with by-products of NaCl and water. The variables examined include comparisons among five types of shells (blood shells, green shells, feather shells, kampak shells, and batik shells) at calcination temperatures of 30°C, 60°C, and 90°C. The best results were obtained from the synthesis using green shells, yielding an aragonite crystal polymorph percentage of 76.4% at a carbonation temperature of 90°C. Conversely, the smallest yield of aragonite crystal polymorph was observed with batik shells at 26.0%.
Co-Authors A. Fani Dwiyulianty Fariadi A. R Yelvia Sunarti A.R Yelvia Sunarti Aissyah Lathifah Adriyanti Akmalia Dinda Oktavianta Amanah Nur Febrianti AR Yelvia AR Yelvia Sunarti Ardika Nurmawati Arfinka Pinakesti Arrizal Buditama Astuti, Dwi Hery Caecillia P udjiastuti Dedin F Rosida Dewati, Retno Dwi Hery Astuti Dwi Hery Astuti Dwi Hery Astuti Dwika Mahtris Nandani Putri Ika N. Puspitawati Ika Nawang Puspitawati Isni Utami ISNI UTAMI Kindriari Nurma Wahyusi Lucky Indrati Utami Mega Rosilina Mega Rosilina Mochamad Titus Maulana Mochamad Titus Maulana Mochammad Rifqi Ardiansyah Mutasim Billah Nashrul Haqqi Nur Hapsari Prasetyo Hadi Rizka Amalia Kusuma Putri RR. Jasmine Nadya E. N. Rochadiana salma sekarningrum Septianingsih, Dilla Shiva Eric Z. Nur Sintha Soraya Santi Sri Djajati Srie Muljani Srie Muljani SRIE MULJANI Suprihatin Wahyu Hidayah Zulianti, Mei Fifa