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All Journal Jurnal Teknologi Jurnal Riset, Inovasi, Teknologi & Terapan
Adlin, Irman Ansari
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Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Optimasi Suhu Pembuatan Arang Aktif Dari Ampas Kopi Terhadap Penurunan Kadar COD Dan BOD Pada Air Limbah Tahu Adlin, Irman Ansari; Ismet, Rhahmasari; Amalia, Syara; Putri, Amanda; Jufrinaldi, Jufrinaldi
Jurnal Riset, Inovasi, Teknologi & Terapan Vol 3, No 2 (2025): Juni
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/ristera.v3i2.7444

Abstract

The tofu industry in Indonesia faces significant challenges in managing liquid waste, which typically contains high levels of Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), exceeding the government-set maximum limits. This study aims to explore the optimization of activated carbon-making temperature from coffee grounds and evaluate its ability to reduce COD and BOD levels in tofu industry wastewater. The methods used in this study include the preparation and characterization of activated carbon produced from coffee grounds with temperature variations from 150°C to 550°C. The results showed that the optimal temperature for preparing active carbon was 450°C, resulting in an active carbon yield of 32.56%. At this temperature, the measured water content was 2.96%, ash content was 2.96%, and iodine absorption was 787.24 mg/g, all of which met the standards of SNI No. 06-3730-1995. Evaluation of the impact of using the resulting activated carbon on tofu industry wastewater revealed a decrease in COD levels from 373.25 mg/L to 122.86 mg/L, corresponding to a 67% decrease, as well as a decrease in BOD levels from 191.65 mg/L to 20.02 mg/L, equivalent to an 89% decrease. These findings suggest that activated carbon derived from coffee grounds can be an effective and sustainable alternative for wastewater treatment, providing a more environmentally friendly waste management solution.
Tannin Test on Celery Leaves (Apium graveolens L.) Using UV-Vis Spectrophotometry Method as an Active Ingredient in Hand Sanitizer Adelina, Dina; Adlin, Irman Ansari; S, Agustina Dyah; Junita, Rusnia
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.6845

Abstract

This study looks into whether celery leaves (Apium graveolens L.) could be used as a source of tannins for making hand sanitizer. This study attempts to find a natural antibacterial agent that can be used instead of hand sanitizers, which are in high demand during the COVID-19 pandemic. The goal was to measure the amount of tannins in celery leaves and see how well they work in hand sanitizers. We used the UV-Vis spectrophotometry approach to find out how much tannin there was, using quercetin as a benchmark. We used maceration with 96% ethanol to get the tannins out, and then we distilled them. The results showed that there was a strong linear association between absorbance and tannin concentration. The average tannin content was 0.1397 mg/g. Then, the celery leaf extract was added to hand sanitizer gels. Successful organoleptic testing showed that the composition was physically stable and had antibacterial properties. This study shows how to use local plant materials, such celery leaves, to make hand sanitizers that are good for the environment and work well. This is a better option than chemical-based solutions. The results show that this method could work on other plants with similar traits.
Konsentrasi Merkuri (Hg) pada Sedimen Amalgamasi yang Dibuang ke Badan Air dari Aktivitas Penambangan Emas Tradisional di Desa Tambang Sawah Kabupaten Lebong Mulyadi, Irwan; Indrawijaya, Budhi; Adlin, Irman Ansari
Jurnal Teknologi Vol 25, No 2 (2025): Agustus 2025
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/teknologi.v25i2.7509

Abstract

Traditional gold mining activities in Tambang Sawah Village, Lebong Regency, Bengkulu Province, produce tailings waste with high concentrations of mercury (Hg). This waste is discharged directly into the Air Putih River without prior treatment. This research aims to measure mercury levels in the tailings and analyze the relationship between the quantity of discarded tailings and the Hg contamination levels in river sediments. Sampling was conducted following the JPHA method, and Hg level analysis was based on NOAA and ASTM guidelines. The results indicate that all tailings samples from 10 discharge points exceeded the mercury contamination threshold. The total estimated tailings discharged each week reached 1,600 kg from 40 miners. The highest concentrations were found at points with the most miners. A laboratory test on 10 tailing samples collected from discharge points along the Air Putih River showed that all samples contained mercury (Hg), with the highest concentration reaching up to 266 ppm.
Co-Authors Adelina, Dina Amalia, Syara Indrawijaya, Budhi Ismet, Rhahmasari Jufrinaldi, Jufrinaldi Junita, Rusnia Mulyadi, Irwan putri, amanda S, Agustina Dyah