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All Journal JURNAL KESEHATAN LINGKUNGAN: Jurnal dan Aplikasi Teknik Kesehatan Lingkungan Jurnal Teknologi
Raudah Raudah
Politeknik Negeri Lhokseumawe
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Mechanical Engineering Public Health

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KOMPOS PELLET DARI AMPAS KOPI GAYO ESPRESSO DENGAN STARTER ALAMI Zahra Fona; Eka Maryan Putri; Ummi Habibah; Raudah Raudah; Zuhra Amalia
JURNAL KESEHATAN LINGKUNGAN: Jurnal dan Aplikasi Teknik Kesehatan Lingkungan Vol 18 No 2 (2021): Jurnal Kesehatan Lingkungan Volume 18 No. 2, Juli 2021
Publisher : Poltekkes Kemenkes Banjarmasin Jurusan Kesehatan Lingkungan Banjarbaru

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.038 KB) | DOI: 10.31964/jkl.v18i2.310

Abstract

Compost is very useful for soil improvement, maintaining soil stability and fertility, and increasing micro nutrients required by plants. This study aims to determine the effect of using natural starters:  chicken manure (A), cow dung (S), and EM4 on composting time, compost pH, and the macro nutrient content made from Gayo espresso coffee waste. The waste of Gayo espresso coffee, which is available abundantly available in coffee shops, which is used as raw material for composting. Starters the form of A, S, a mixture of A with S, and EM4 are used to shorten composting time, and improve compost characteristics to conform to SNI standards. Gayo espresso coffee waste is mixed with starter A, starter mixture S. starter mix, and EM4 then fermented in a closed container. Compost pH measurements during the composting process are carried out every day until the pH is close to neutral, which indicates the compost is ripe. After composting, the products that were quickly formed from all treatment variables were tested for macro nutrient levels in the form of N, P, K and C / N ratios. The compost is printed in the form of pellets using a pelletizer mold. The test results showed that the use of 200g starter A (cow dung) and 6 ml EM4 produced compost within 25 days. The average acidity of the compost for all treatments ranged from 6.83. Micro nutrient content in the compost is 1.11% nitrogen, 0.81% phosphorus, 1.64% potassium and C / N ratio 11.06, according to SNI standards.
Pengaruh Resirkulasi Fraksi Cair Selama Karbonisasi Hidrotermal terhadap Karakteristik Arang Hidro Kulit Tanduk Kopi T. M. Abrar Farhan Yazid; Sariadi Sariadi; Ratna Sari; Raudah Raudah
Jurnal Teknologi Vol 26, No 1 (2026): April 2026
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v26i1.8513

Abstract

This research investigates the optimization of hydrochar production from coffee husks through a microwave-assisted Hydrothermal Carbonization (HTC) process, focusing on the influence of reaction time and liquid fraction recirculation. The main objective is to evaluate how these two variables affect the characteristics of the hydrochar and the chemical composition of the liquid fraction. Hydrochar characteristics were analyzed through iodine adsorption tests and acid group density measurements, while the liquid fraction from the optimal cycle was analyzed using High-Performance Liquid Chromatography (HPLC). The results indicated that the optimal operating time was 120 minutes, which produced the highest iodine adsorption capacity of 31,034.39 mg/g. Recirculating the liquid fraction for one cycle significantly increased the iodine adsorption capacity, reaching a peak of 34,309.18 mg/g. This improvement was driven by the acid-catalytic effect of the liquid fraction, which was shown to accumulate acetic acid (0.153% v/v). However, excessive recirculation led to a decrease in hydrochar quality due to pore blocking. In conclusion, the combination of a 120-minute carbonization process with a single recirculation cycle represents the optimal condition for producing high-quality hydrochar, effectively balancing pore development with the catalytic effects of liquid fraction recirculation
Co-Authors Eka Maryan Putri Ratna Sari Sariadi Sariadi T. M. Abrar Farhan Yazid Ummi Habibah Zahra Fona Zuhra Amalia