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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut Jurnal Teknologi Lingkungan Jurnal Bahan Alam Terbarukan
Jayanudin
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science

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Pengaruh Penambahan Kamper sebagai Aditif terhadap Karakteristik dan Emisi Gas Buang Mesin Berbahan Bakar Bensin Nuryoto; Sobarsah, G. Awaludin; Rahmayetty, Rahmayetty; Jayanudin
Jurnal Teknologi Lingkungan Vol. 25 No. 2 (2024)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jtl.2024.1055

Abstract

Abstract The automotive industry, synonymous with motorized vehicles, has experienced rapid development, and every motorized vehicle requires fuel as its power source. To ensure optimal engine performance, some individuals add additives to fuel using camphor. Research on camphor as a fuel additive is not new, as it has been studied by several researchers before, although with the use of premium gasoline in previous studies. In this study, we observed a different type of fuel, namely "pertalite," and conducted tests to assess camphor's solubility in pertalite, variations in octane number, and their impact on exhaust gas emissions. Therefore, the study aimed to understand the effects of camphor addition on the increase in octane number, changes in fuel characteristics, camphor dissolution time, and emissions from exhaust gas. The study involved varying camphor additions from 1 to 8% in pertalite fuel. The results of the study indicate that the use of camphor as a fuel additive in pertalite fuel does not have a negative impact on the environment in terms of exhaust gas emissions. However, it is not fuel-efficient due to the minimal increase in octane number, only rising from 90 to 90.4 (with an 8% camphor addition). Furthermore, it causes fluctuations in vapor pressure, ranging from 45 to 58.8 kPa, which can affect the combustion process in the chamber. On the other hand, the dissolution time of camphor is relatively long, requiring 5–26 minutes for concentrations of 1–8%, making it inefficient. The study results are expected to provide initial insights for developing other additives, such as alcohol, which is a renewable and safe chemical.   Abstrak Industri otomotif yang identik dengan kendaraan bermotor mengalami perkembangan yang sangat pesat, dan setiap kendaraan bermotor membutuhkan bahan bakar sebagai pengeraknya. Agar performa mesin tetap terjaga baik, ada sebagian masyarakat menambahkan aditif ke dalam bahan bakar menggunakan kamper. Penelitian terkait kamper sebagai aditif bahan bakar bukanlah hal baru, karena telah dilakukan riset oleh beberapa peneliti sebelumnya, tetapi menggunakan bahan bakar jenis premium. Penelitian dilakukan dengan melakukan pengamatan menggunakan bahan bakar yang berbeda yaitu jenis pertalite, serta melakukan pengujian kelarutan kamper ke dalam pertalite, perubahan karakteristik, bilangan oktana, serta pengaruhnya terhadap emisi gas buang. Oleh karena itu, penelitian ini mempunyai tujuan untuk menguji dan mengetahui pengaruh penambahan kamper terhadap peningkatan bilangan oktana, perubahan karakteristik bahan bakar jenis pertalite, waktu pelarutan kamper, dan emisi pada gas buang. Pengamatan dilakukan dengan memvariasikan penambahan kamper sebesar 1–8% pada bahan bakar pertalite. Hasil penelitian menunjukan bahwa penggunaan aditif berupa kamper pada bahan bakar pertalite tidak memiliki dampak negatif terhadap lingkungan terkait emisi gas buang, tetapi tidak ekonomis karena peningkatan bilangan oktana yang dihasilkan sangat kecil yaitu hanya meningkat dari 90 menjadi 90,4 (pada penambahan kamper sebanyak 8%). Selain itu berakibat fluaktiatif terhadap tekanan uap yaitu dari 45 menjadi 58,8 kPa, selanjutnya turun lagi dibawah 58,8 kPa, yang mana akan mempengaruhi proses pembakaran pada ruang bakar. Pada sisi yang lain, waktu pelarutan kamper tergolong lama karena membutuhkan waktu 5–26 menit untuk kadar 1–8%, sehingga menjadi tidak efisien. Hasil penelitian ini diharapkan dapat menjadi informasi awal untuk pengembangan aditif yang lain seperti alkohol yang merupakan bahan kimia yang dapat diperbarui dan aman.
MODIFIKASI DINDING BUBU LIPAT UNTUK MELOLOSKAN RAJUNGAN YANG BELUM LAYAK TANGKAP: Collapsoble Trap Wall Modification to Realease Under Size Blue Swimming Crab Susanto, Adi; Sutrawan Nurdin, Hery; Jayanudin; Irnawati, Ririn; Hamzah, Asep; Supadminingsih, Fahresa Nugraheni; Syafrie, Hendrawan; Azkia, Lana Izzul; Sucilawati, Mumung; Adisaputra, Divandra Yogi; Hikmatyar, Alfito Dicky
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 15 No. 1 (2024): Marine Fisheries: Journal of Marine Fisheries Technology and Management
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jmf.v15i1.49776

Abstract

Increasing of fishing pressure poses a serious threat to the sustainability of blue swimminng crab resources. Trap design modifications are needed to improve size selectivity and to release under size crabs. This study aimed to determine the type of wall modification of collapsible trap that is effective in excluding under size blue swimming crab. Laboratory observations were conducted using four escape vents treatments and three different mesh sizes. The escape gap used are rectangular, square, circular and oval respectively. Moreover, the mesh sizes used are 2.0 inches, 2.5 inches and 3.0 inches. Descriptive analysis and scoring were used to determine the most effective type of wall trap modification to be used in the blue swimming crab fishing. The results showed that the rectangular escape gap has better effectiveness than other shapes with the percentage of crabs that pass through at 86.7%. The wall modification using a 3.0-inch mesh size had better performance than the other modification types with a total score of 19. Collapsible trap with a 3.0-inch mesh wall was able to escape 86.7% of the crabs with an escape time of only 11.2 seconds and an average escaped crab carapace width of 78 mm. Keywords: Collapsible trap, escape gap, environmentaly-frendly fisheries, mesh size of trap wall
The Influence of The Weight of N,N’-Methylene-bis-Acrylamide as Crosslinker on The Ability of Chitosan-Graft-Poly (Acrylic Acid) Superabsorbent to Water Retention in Sandy Soil Amin Yulianto; Jayanudin; Heri Heriyanto; Dimas Prasetyo
Jurnal Bahan Alam Terbarukan Vol. 13 No. 2 (2024): December 2024 [Nationally Accredited Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v13i2.11245

Abstract

Enhancing the agricultural productivity of sandy soil can be achieved by incorporating a superabsorbent material that serves dual purposes: improving water retention and gradually releasing fertilizer nutrients. The objective of this study is to determine the influence of the weight of N,N’-methylene-bis-acrylamide (MBA) as a crosslinker in chitosan-graft-poly(acrylic acid) superabsorbent on water holding and water retention in sandy soil. The superabsorbent was prepared by mixing a chitosan solution with ammonium persulfate as a catalyst and acrylic acid, which had been neutralized with KOH. Subsequently, the mixture was cross-linked using MBA. The resulting superabsorbent indicated that an increase in the weight of MBA decreased the swelling ratio and increased water retention due to a denser network structure. The water holding capacity for superabsorbent prepared with all MBA weights was nearly the same. The highest swelling ratio and water retention were 167.552 g/g and contained 7.6% water on day 7 for the superabsorbent crosslinked with 0.015 g of MBA.
Co-Authors Adi Susanto Adisaputra, Divandra Yogi Amin Yulianto Dimas Prasetyo Fahresa Nugraheni Supadminingsih, Fahresa Nugraheni Gustiana Awaludin Sobarsah Hamzah, Asep Hendrawan Syafrie Heri Heriyanto Hikmatyar, Alfito Dicky Lana Izzul Azkia, Lana Izzul Nuryoto Rahmayetty Rahmayetty Ririn Irnawati Sucilawati, Mumung Sutrawan Nurdin, Hery