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All Journal JURNAL TEKNOLOGI LINGKUNGAN Bio-Lectura Jurnal Rekayasa Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis
Suciati, Fuzi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science

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POTENSI PAJANAN POLYBROMINATED DIPHENYL ETER DALAM EKONOMI LINGKAR WASTE FROM ELECTRICAL AND ELECTRONIC EQUIPMENT Suciati, Fuzi; Aviantara, Dwindrabata Basuki; Herlambang, Arie
Jurnal Rekayasa Lingkungan Vol. 14 No. 2 (2021): JURNAL REKAYASA LINGKUNGAN
Publisher : BPPT

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Abstract

Bahan penghambat nyala telah diketahui lazim ditambahkan dalam produk perangkat listrik dan elektronik. Polybrominated diphenyl ethers (PBDEs) merupakan bahan penghambat nyala (flame retardant) yang lazim digunakan. Karena sifatnya yang tidak mudah terurai secara alami PBDEs merupakan persistent organic pollutants (POPs) yang keberadaannya dapat membahayakan manusia dan lingkungan. Limbah perangkat listrik dan elektronik (WEEE/E-waste) diketahui memiliki material yang masih memiliki nilai ekonomi. Kegiatan daur ulang maupun pemanfaatan WEEE dalam koridor ekonomi lingkar memiliki potensi hambatan akibat adanya PBDEs. Bukti bahwa PBDEs terdapat pada kompartemen udara, air, tanah dan biota termasuk ASI mengindikasikan bahwa PBDEs dapat menjalani proses pelipatan biologik melalui jalur jejaring makanan dan rantai makanan. Status WEEE sebagai limbah spesifik memerlukan pengawasan pengelolaan E-waste agar pajanan kronik PBDEs terhadap manusia dan mahluk hidup lainnya dapat diminimalkan. Kata kunci: WEEE, PBDEs, circular economy, pajanan, nasib lingkungan
KARAKTERISASI MORFOLOGI DAN FISIOLOGI MIKROB PELARUT FOSFAT DAN MIKROB PENAMBAT N2 (AZOTOBACTER) DARI RHIZOSFER TANAMAN PADI DAN TANAH HUTAN CIFOR DRAMAGA BOGOR Maatoke, Cornelia Dolfina; Dewani, Zahriska; Suciati, Fuzi
Bio-Lectura : Jurnal Pendidikan Biologi Vol. 11 No. 1 (2024)
Publisher : Universitas Lancang Kuning

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/bl.v11i1.19518

Abstract

This study aims to determine the morphological and physiological properties of Phosphate Solubilizing Microbes (MPF) and Azotobacter. The method used was to test morphological properties using gram staining and physiological properties tests using biochemical tests based on cell activity by looking at the interaction of bacterial metabolism with the test reagent media. Data analysis examined the reaction to the isolated morphological and physiological test media. The results showed that based on the morphological observations of the MPF, the colonies showed a slightly milky white color, round, convex, slimy shape, 1-2 mm in diameter and flattened, and Gram-positive. Azotobacter shows the characteristics of transparent color, convex, flat edges, slightly slimy, an average diameter of 1 mm, and is Gram-negative; whereas based on the results of physiological test observations for catalase and oxidation tests, the characteristic of MPF and Azotobacter, each showed a positive (+) effect, as seen from the formation of bubbles in the test results. Tests for motility and O2 requirements show that both bacteria are motile, mobile and aerobic or require oxygen for growth. The observations of resistance in the pH range showed that Azotobacter was more resistant to extreme acid-base pH with a pH range of 3-9, while MPF could only survive in a pH range of 5-9. Tests of glucose and sucrose fermentation showed that MPF did not form gas bubbles (-) and no color change(-). At the same time, Azotobacter showed the formation of gas bubbles (+) but no color change (-).
Use of Sulfuric Acid-Impregnated Biochar Catalyst in Making of Biodiesel From Waste Cooking Oil Via Leaching Method Sofyan, Muhammad Ihsan; Mailani, Putri Julpa; Setyawati, Avi Waras; Sulistia, Susi; Suciati, Fuzi; Hauli, Latifah; Putri, Reza Audina; Ndruru, Sun Theo C. L.; Mawarni, Rista Siti; Meliana, Yenny; Nurhayati, Nurhayati; Joelianingsih, Joelianingsih
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 1 Year 2024 (April 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20113

Abstract

The biodiesel synthesis of waste cooking oil (WCO) over a impregnated biochar catalyst was systematically studied. This research aimed to prepare Biochar-based material that comes from coconut coir, activate it, and apply it as a catalyst to the esterification reaction of high-FFA waste cooking oil. Activation of the catalyst was done by impregnation H2SO4 solution in Biochar. The obtained catalyst was characterized by FTIR, XRF, XRD, surface area analyzer, and SEM-EDS. The esterification process was conducted by varying the catalyst weight (5, 7, and 10 wt%) and the reaction temperature (55 and 60 °C). The obtained liquid yields were characterized by GC-MS. The study found that the esterification process worked best with 10 wt% catalysts, a 1:76 mole ratio of oil to alcohol, and a reaction temperature of 60 °C. The waste cooking oil was successfully converted into biodiesel, reaching 84.50% of yield and 77.30% of purity (methyl ester content). Meanwhile, testing using national biodiesel standards with parameter limits of density, viscosity, iodine number, and acid number shows results that meet the requirements. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Arie Herlambang Aviantara, Dwindrabata Basuki Aviantara, Dwindrata Aviantara, Dwindrata B Cornelia Dolfina Maatoke Dewani, Zahriska Hanies Ambarsari Hauli, Latifah Joelianingsih . Mailani, Putri Julpa Manurung, Brian Saputra Mawarni, Rista Siti Meliana, Yenny Ndruru, Sun Theo C. L. Nurhayati Nurhayati Putri, Reza Audina Rudi Nugroho Setyawati, Avi Waras Sofyan, Muhammad Ihsan Susi Sulistia, Susi Syah, Iman