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All Journal Jurnal Ilmiah Teknik Kimia Serambi Engineering
Ketut Sumada
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Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Industrial & Manufacturing Engineering

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Studi Kuantitas dan Kualitas Biogas dari Berbagai Jenis Limbah Organik dan Waktu Fermentasi Zahran William Dzulfiqar; Muhammad Miftahul Rizki; Ketut Sumada
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Biogas is a renewable energy obtained from the fermentation process or decomposition of organic materials by microorganisms in an environment without oxygen (anaerobic). This study aims to analyze the quantity and quality of biogas generated from various types of organic waste, including mustard greens, water spinach, cabbage, raja banana peels, and Medan orange peels, with fermentation periods of 10, 12, 14, 16, and 18 days. The quantity of biogas was measured based on the volume produced, while its quality was determined by the methane (CH₄) content using the Orsat Gas Analysis Apparatus. The results showed that raja banana peels produced the highest quantity and quality of biogas, with a maximum volume of 1393.2 ml and the highest methane content at 70.39% among all samples. These findings indicate that raja banana peels have significant potential as a substrate for biogas production. This research is expected to serve as a foundation for the development of technologies that utilize organic waste as an efficient, environmentally friendly, and sustainable alternative energy source.
Pembuatan Pupuk Organik Cair Berbahan Dasar Limbah Batang Tembakau Secara Fermentasi Anaerob Yasmiati; Nadya Lenvylea Laras; Ketut Sumada
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Tobacco is a widely cultivated agricultural commodity in Indonesia, producing significant waste in the form of stalks and roots. Currently, these wastes have not been widely utilized and are only dumped into the environment. Tobacco stalks contain essential nutrients and can potentially be used as raw material for liquid organic fertilizer (LOF). Therefore, research was conducted on the manufacture of liquid organic fertilizer from tobacco stem waste and evaluating the effect of tobacco stem weight and fermentation time on the quality of the LOF produced. The weights used were 25 g, 50 g, 75 g, 100 g, and 125 g, with fermentation times ranging from 1 to 5 weeks. The fermentation process was carried out in sealed bottles with additional coconut water, palm sugar, and EM-4, after cutting the stalks into small pieces (0.5–1 cm). The quality of the LOF was assessed based on organic carbon and nitrogen content using titrimetri and Kjeldahl methods. Results showed that increasing stalk weight elevated both organic carbon and nitrogen levels. Longer fermentation reduced organic carbon but increased nitrogen content up to an optimal point. Optimization of both variables is crucial to improve LOF quality.
Model Matematis Bioadsorben dari Tongkol Jagung Termodifikasi Belimbing Wuluh sebagai Pengolahan Limbah Logam Cu Artifisial Novan Sandhi Pradana; Firly Firmalya; Ketut Sumada
Jurnal Ilmiah Teknik Kimia Vol. 10 No. 1 (2026): JURNAL ILMIAH TEKNIK KIMIA
Publisher : Program Studi Teknik Kimia, Universitas Pamulang

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Abstract

Harmful pollutants found in waste include the heavy metal Cu (Copper). Methods that can be used to reduce the heavy metal content of copper include the adsorption process. This adsorption methods was chosen because this process does not produce toxins and the raw materials for adsorbent are more economical such as corn cobs. Corn cobs have a carbon content of 43,42% and have a sufficiently high porous structure. This research aims to determine a compatible mathematic model on the process of adsorption of Cu waste with corn cobs bioadsorbent. The process of making bioadsorbents uses star fruit organic matter as an activator to increase absorption of copper heavy metals. The copper heavy metal adsorption process is carried out by adding the bioadsorbent to artificial liquid waste with adsorbent mass variations of 2.5, 5, 7.5, 10, 12.5 grams and varying harvesting times from 40 to 120 minutes. The results of the analysis using the Atomic Absorption Spectrophotometry (AAS) method revealed that the percentage of copper metal absorption by the best bioadsorbent is 89.55%. This percentage was observed with an adsorbent mass addition of 12.5 grams and a contact time of 120 minutes. Based on the calculations of the mathematical model of heavy metal Cu adsorption by activated carbon from corn cobs using the Langmuir Isotherm model, the resulting equation is y = 0.5497x + 9.968 with a value of R²= 0.994.
Co-Authors Firly Firmalya Muhammad Miftahul Rizki Nadya Lenvylea Laras Novan Sandhi Pradana Yasmiati Zahran William Dzulfiqar