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Signifikansi Kadar Kafein pada Kopi Kerinci Robusta dalam Berbagai Interval Waktu Soeswanto, Bambang; Yusuf, Yusmardhany; Sihombing, Rony Pasonang; Suryadi, Joko; Luviana, Angely; Asyari, Restu Adji Alif; Adhitasari, Alfiana
Eksergi Vol 20, No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.10353

Kopi Kerinci Robusta merupakan salah satu kopi yang digemari masyarakat Indonesia yang tumbuh di daerah Kerinci. Selama ini masyarakat hanya mengenal kopi ini untuk dinikmati saja, tanpa memperhitungkan jumlah kandungan kafein yang akan terkonsumsi. Penelitian ini bertujuan untuk mengetahui rasio terbaik pada ekstraksi kopi Kerinci Robusta menggunakan pelarut etil asetat. Rasio umpan: pelarut (b/v) yang digunakan adalah 1:5; 1:7.5; 1:10; 1:12.5. Pelarut yang digunakan dalam penelitian ini adalah etil asetat. Metode penelitian yang digunakan adalah metode ekstraksi dengan kondisi operasi 50⁰C selama 2 jam dengan interval pengambilan sampel setiap 20 menit. Kadar kafein hasil penelitian diukur dengan menggunakan spektrofotometri pada panjang gelombang 273 nm. Hasil penelitian menunjukkan bahwa rasio optimum adalah rasio 1:5 yang menghasilkan kadar kafein sebesar 3737.41 ppm.

A Comparative Study of Coconut Shell and Melinjo Shell as Carbon Sources for Bio-Briquette Production Augustina, Nadya; Manfaati, Rintis; Rizky, Alfiani; Yusuf, Yusmardhany; Adhitasari, Alfiana
Eksergi Vol 21, No 2 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i2.10180

The aim of this research was to investigate the influence of adding Melinjo shells on the quality and efficiency of charcoal-based bio-briquettes. A combination of coconut shells and Melinjo shells in various ratios was utilized in the study. The briquettes were produced through a carbonization process at a temperature of 300°C for 60 minutes, with tapioca flour used as a binder. Subsequently, the briquettes underwent testing to determine moisture content, ash content, volatile matter, and calorific value. The research findings indicated that all briquettes met the calorific value requirements set by the Indonesian National Standard (SNI), exceeding 5,000 cal/g. The addition of Melinjo shells resulted in a reduction in ash and volatile matter content but also led to a decrease in calorific value. Based on the analysis, the optimal composition obtained was 90 grams of coconut shells and 10 grams of Melinjo shells, producing briquettes with a calorific value of 5,582 cal/g, ash content of 3.76%, and volatile matter content of 6.65%. Therefore, further research is recommended to identify easily combustible components in Melinjo shells to ensure their potential in reducing the amount of ash produced when the briquettes are burned.

Risk Analysis Related to the Possibility of Using CNG in Trans Jogja Buses Perwitasari, Perwitasari; Anggorowati, Heni; Yusuf, Yusmardhany
CHEESA: Chemical Engineering Research Articles Vol. 5 No. 1 (2022)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v5i1.10824.28-39

One of the issues in urban areas such as DI Yogyakarta province is air pollution. The pollution level is high, as shown by the quality index value of about 85.25 in 2019. Vehicle emissions are the most significant source of this pollution in urban areas and can be decreased by using fuel with minimum carbon emission. Compressed Natural Gas (CNG) is an environmentally friendly fuel. However, a safety study is required because CNG is stored under high pressure. Therefore, this research aims to analyze the risk of using CNG in the Trans Jogja bus. The research method collects secondary data and then processes them using FTA, ETA, ALOHA software, and a risk matrix. The result shows that the risk value for CNG usage in the Trans Jogja bus is low to a moderate level or acceptable.

The Effect of Solvent-to-Coffee Ratio on Caffeine Content in Ethyl Acetate Extracts of Arabica Gayo Coffee Beans Soeswanto, Bambang; Sihombing, Rony Pasonang; Suryadi, Joko; Hariyadi, Tri; Paramitha, Tifa; Yusuf, Yusmardhany; -, Alfiana Adhitasari
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 3 (2023): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i3.16573

This paper studies the optimal ratio that gives the highest caffeine amount and improves the efficiency and quality of extraction from Arabica Gayo coffee beans. No previous studies have explored the best ratio of Gayo Arabica coffee beans to ethyl acetate solvent for extracting caffeine. The paper explains the method used, which has four main steps: preparing materials, extracting and measuring caffeine, and analyzing the results. The paper presents the experimental findings and discusses how different ratios affect caffeine content in Arabica Gayo coffee beans. It uses statistics to show significant differences between the ratios and compares them using Tukey tests. The paper concludes that the best solvent-to-coffee ratio for maximizing caffeine in ethyl acetate extracts is 1:5, resulting in a concentration of 1411.1 ppm. This ratio gives the best balance between caffeine yield and solvent usage.

Effect Of The Utilization Of Chicken Egg Shell Waste As A Lime Mixture On Ph Parameters In Mine Acid Water Saputro, Kristanto Jiwo; Suharyadi, Heru; Yusuf, Yusmardhany; Khalilullah, Hanif; Sari, Sindi Mutika; Muhammad, Bagoes Nur; Yusuf, Nur Reza Muhammad
Eduvest - Journal of Universal Studies Vol. 4 No. 11 (2024): Journal Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v4i11.44760

Acid mine drainage (AMD) is a significant environmental impact of coal mining, particularly in open-pit mining systems. To neutralize AMD acidity, the commonly used method involves adding quicklime (CaO). This study aims to evaluate the effectiveness of using eggshells, which contain calcium carbonate (CaCO3), as an additive to quicklime in AMD treatment. Experiments were conducted with varying doses of ground and calcined eggshells at 150°C and 300°C. The results indicate that calcining eggshells at higher temperatures enhances their effectiveness in increasing AMD pH. Without calcination, the pH increased by 1.87%, while calcination at 150°C and 300°C resulted in pH increases of 1.87% and 8.6%, respectively. However, excessive doses of eggshells may decrease pH. Therefore, using calcined eggshells as an additive to quicklime offers a more economical and environmentally friendly solution for AMD treatment.

Characterization of Coffee Business Waste in the form of Robusta Coffee Dregs as Adsorbent: A Preliminary Study Sihombing, Rony; Soeswanto, Bambang; Adhitasari, Alfiana; Yusuf, Yusmardhany; Putri, Alifhah Ananda; Fatah, Khalaida Fania; Clarisa, Shintiya; Gunawan, Sinna Chaerunnabila; Leoanggraini, Unung; Muhari, Emma Hermawati; Kurnia, Dianty Rosirda Dewi
Journal of Green Science and Technology Vol 9 No 1 (2025): Journal of Green Science and Technology Vol. 9 No. 1 March 2025
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i1.9104

Robusta coffee grounds are widely produced in several types of businesses, one of which is the coffee industry (coffee shop). This pulp can be reused by business people by being used as an adsorbent and paired with the industrial waste. The purpose of this research is to identify the carbon of Robusta coffee grounds between before and after chemical activation. The methods used were sieving, drying at 25°C to 110°C, carbonization at 600°C, immersion in 0.1M HCl solution. Carbonization of Robusta coffee grounds was carried out using BET, FTIR and SEM. The results showed an increase in carbon surface area from 0.588 m2/g to 14.609 m2/g. The results of the FTIR method showed a change in functional groups on several peaks between pre- and post-activation conditions. The results of the SEM method showed an increase in pore size from 5.5 µm (before activation) to 11 µm (after activation). Keywords: Robusta coffee, Coffee grounds, FTIR, Adsorbent

Enhancing Hard Anodization ff Aluminum 1100 using Variated Concentration and Aeration in 20% Sulfuric and Phosphoric Acid Electrolytes Leoanggraini, Unung; Yusuf, Yusmardhany; Nugraha, Ganjar; Samuel, Samuel; Sarip, Fahmi Haddad; Trirahayu, Dhyna Analyes; Sihombing, Rony
Journal of Green Science and Technology Vol 8 No 2 (2024): Journal of Green Science and Technology Vol.8 No.2 September 2024
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v8i2.9424

Aluminum is widely used in manufacturing, especially in automotive and aerospace, due to its light weight and easy form, although it is worn. The purpose of this research is to get the highest layer formation efficiency. During the application, hard anodizing creates a new layer in the form of a anatural protective layer on the metal surface. In hard anodized aluminum, the specimen sanded, degreasing with base, and acid neutralization. Then, hard anodizing is performed by connecting the workpiece to the positive pole and the cathode to the negative pole with a current density of 3A/dm² for 30 minutes in an electrolyte solution at a temperature of 5°C. The variations used are the mixture composition between sulfuric acid (concentration 15% - 20%) and low concentration phosphoric acid (0%, 1%, 2%, 3%, 4%, 5%) which are differentiated into aerated and non-aerated systems. Then weigh the anodized work piece to determine the weight gain of the metal due to the formed layer. The weight of the obtained layer is used to determine the efficiency of the formation of oxide layer. The best layer formation efficiency is found in the sulfuric acid - phosphoric acid concentration variation (15% - 1%) in the aerated system at 73.47%. While the non aerated system at 73.28%. The aerated condition shows superior results compared to the non-aerated system, yielding better efficiency values than the non-aerated system. Keywords: Aluminum 1100, Hard Anodizing, Mechanical Properties, Aeration, Electrolyte

A Comparative Study of Coconut Shell and Melinjo Shell as Carbon Sources for Bio-Briquette Production Augustina, Nadya; Manfaati, Rintis; Rizky, Alfiani; Yusuf, Yusmardhany; Adhitasari, Alfiana
Eksergi Vol 21 No 2 (2024)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v21i2.10180

The aim of this research was to investigate the influence of adding Melinjo shells on the quality and efficiency of charcoal-based bio-briquettes. A combination of coconut shells and Melinjo shells in various ratios was utilized in the study. The briquettes were produced through a carbonization process at a temperature of 300°C for 60 minutes, with tapioca flour used as a binder. Subsequently, the briquettes underwent testing to determine moisture content, ash content, volatile matter, and calorific value. The research findings indicated that all briquettes met the calorific value requirements set by the Indonesian National Standard (SNI), exceeding 5,000 cal/g. The addition of Melinjo shells resulted in a reduction in ash and volatile matter content but also led to a decrease in calorific value. Based on the analysis, the optimal composition obtained was 90 grams of coconut shells and 10 grams of Melinjo shells, producing briquettes with a calorific value of 5,582 cal/g, ash content of 3.76%, and volatile matter content of 6.65%. Therefore, further research is recommended to identify easily combustible components in Melinjo shells to ensure their potential in reducing the amount of ash produced when the briquettes are burned.

Signifikansi Kadar Kafein pada Kopi Kerinci Robusta dalam Berbagai Interval Waktu Soeswanto, Bambang; Yusuf, Yusmardhany; Sihombing, Rony Pasonang; Suryadi, Joko; Luviana, Angely; Asyari, Restu Adji Alif; Adhitasari, Alfiana
Eksergi Vol 20 No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.10353

Kopi Kerinci Robusta merupakan salah satu kopi yang digemari masyarakat Indonesia yang tumbuh di daerah Kerinci. Selama ini masyarakat hanya mengenal kopi ini untuk dinikmati saja, tanpa memperhitungkan jumlah kandungan kafein yang akan terkonsumsi. Penelitian ini bertujuan untuk mengetahui rasio terbaik pada ekstraksi kopi Kerinci Robusta menggunakan pelarut etil asetat. Rasio umpan: pelarut (b/v) yang digunakan adalah 1:5; 1:7.5; 1:10; 1:12.5. Pelarut yang digunakan dalam penelitian ini adalah etil asetat. Metode penelitian yang digunakan adalah metode ekstraksi dengan kondisi operasi 50⁰C selama 2 jam dengan interval pengambilan sampel setiap 20 menit. Kadar kafein hasil penelitian diukur dengan menggunakan spektrofotometri pada panjang gelombang 273 nm. Hasil penelitian menunjukkan bahwa rasio optimum adalah rasio 1:5 yang menghasilkan kadar kafein sebesar 3737.41 ppm.

Utilization of Coffee Grounds and Fly Ash as Adsorbents to Reduce Phosphate Content in Laundry Wastewater Yusuf, Yusmardhany; Fatah, Khalaida Fania; Gunawan, Sinna Chaerunnabila; Soeswanto, Bambang; Sihombing, Rony Pasonang; Adhitasari, Alfiana
Eksergi Vol 22 No 1 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i1.12880

Industrial laundry wastewater contains 70-80% phosphate which can cause environmental pollution and trigger the growth of algae blooms or eutrophication if it is discharged into the environment. The adsorption method was chosen to reduce the phosphate content in laundry waste because it is relatively simple and low cost. The adsorbent used can use coffee grounds and fly ash, where coffee grounds have 47.8-58.9%. The composition used for the adsorption process is a ratio of coffee grounds: fly ash (w/w) of 1:0 and 1:1. Contact time in the adsorption process varies between 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes. Based on research results, the best reduction in phosphate levels from laundry waste was 45.88%, where the initial phosphate level in the waste was 10.2 mg/L. Apart from that, the efficiency of reducing COD levels with the best removal efficiency was 80.39% with the initial COD content in the waste being 4080 mg/L. The best composition for testing laundry waste is 1:1 coffee grounds and fly ash (w/w) and the best contact time for testing laundry waste is 150 minutes

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