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All Journal JURNAL NASIONAL TEKNIK ELEKTRO Sains Natural: Journal of Biology and Chemistry
Dhias Cahya Hakika
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Electrical & Electronics Engineering

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Isotherm Adsorption of Ion Phosphate from Vinasse Waste Using Quaternary Ammonium Polymer as Adsorbent in Term Effect of Temperature Veranica; Rahayu, Aster; Maryudi; Dhias Cahya Hakika; Lee Wah Lim; Lia Anggresani
Sains Natural: Journal of Biology and Chemistry Vol. 14 No. 2 (2024): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31938/jsn.v14i2.720

Abstract

Vinasse liquid waste is a waste product resulting from the ethanol distillation process. Phosphate in high concentrations can harm the environment, such as by polluting water sources and underground surfaces. In this research, adsorption of phosphate ions was carried out in vinasse waste to remove these pollutants using quaternary ammonium polymers. The study examined the effect of vinasse waste sample temperature on the adsorption of phosphate ions. The first step in this work was to create a quaternary ammonium polymer utilising a one-pot technique using 2-[methacryloyloxy)ethyl trimethylammonium chloride solution, also referred to as META. Subsequently, the adsorption process was performed using temperature variations of 25, 30, 40, 50, and 60 . Phosphate ion adsorbance was measured with UV-Vis spectrometers at a wavelength of 880 nm. The quaternary ammonium polymer succeeded in adsorbing the phosphate ion content of the vinasse waste at an optimal temperature of 40 , with an adsorption capacity of 3.78 mg/L and a removal efficiency of 75.70%.  The adsorption isotherm model for phosphate ions onto quaternary ammonium polymer was studied using the Freundlich and Langmuir equations. The obtained data indicated that the Langmuir isotherm model, with an value of 0.9921, is well-suited for describing the adsorption behaviour in this research.
Isothermic Adsorption Study of Nitrate Ion Adsorption in Bioethanol Waste Using Quaternary Ammonium Polymer Amrillah, Nafira Alfi Zaini; Rahayu, Aster; Dhias Cahya Hakika; Vivi Sisca; Veranica; Firda Mahira Alfiata Chusna; Lia Anggresani; Lee Wah Lim
Sains Natural: Journal of Biology and Chemistry Vol. 15 No. 1 (2025): Sains Natural
Publisher : Universitas Nusa Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31938/jsn.v15i1.770

Abstract

The global shift towards renewable energy sources has led to a significant increase in bioethanol production, particularly from sugar mills. Despite being an environmentally friendly alternative to fossil fuels, bioethanol production produces large amounts of waste containing dangerous contaminants such as nitrate ions (NO₃⁻). These contaminants pose severe environmental and health risks, including water pollution and eutrophication. This study explores the use of ammonium polymer as an adsorbent and the influence of pH in the adsorption process as a promising technique for removing nitrate ions from bioethanol waste. Based on the analysis that has been carried out, the optimal pH for adsorption of nitrate ions is around 9, where the removal efficiency (%RE) reaches 98.43% and the adsorption capacity (Qe) is 24.86 mg/g. These experiments show that the Freundlich model, with a heterogeneity factor (n) of 1.0947 and a Freundlich constant (KF) of 1.92 x 10³ units, provides the best fit to the adsorption data, indicating a heterogeneous adsorption process with a strong affinity for nitrate ions.
Design of Oxygen and Carbon Dioxide Monitoring System in Cocoa Fermentation with Internet of Things and Automatic Stirring System Sabila, Liya Yusrina; Linggar Rahmat Dwiyono; Agus Rahman Hakim; Abi Nazli Karuana; Dhias Cahya Hakika; Farrah Fadhillah Hanum
JURNAL NASIONAL TEKNIK ELEKTRO Vol 14, No 2: July 2025
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jnte.v14n2.1245.2025

Abstract

In some areas in Indonesia, more traditional cocoa farmers have yet to carry out special monitoring of O2 and CO2 levels during fermentation because the practices and technologies used by cocoa farmers can vary significantly in different regions and levels of development. The right amount and level of O2 and CO2  can regulate the activity of microorganisms and affect the overall fermentation process. The fermentation box is made using a wooden board measuring 50x50 cm and is equipped with a stirring blade inside. The sensors used are the Gravity O2 I2C Sensor and the CO2 Sensor MG-118, with a high torque D.C. motor as the stirring blade drive. The results of monitoring and controlling the stirrer are carried out using the Blynk IoT platform or directly on the fermentation box. The tests carried out include testing on an empty fermentation box and testing on the fermentation process of 1kg and 6kg cocoa. After carrying out the testing process, the sensors and IoT systems created can work optimally. The sensor test results in the cocoa fermentation process show a change in CO2 concentration, initially 400 ppm, increasing to a maximum of 1600 ppm. Meanwhile, the O2 concentration remains stable at 20-21% vol, and the stirrer can work optimally. The D.C. motor-driven stirrer can operate effectively with a stirrer response time of 2 seconds and a stirring efficiency of 95% at both fermentation loads (1kg and 6kg). The monitoring system integrated with the Blynk IoT platform shows a gas measurement accuracy rate of 98%, making it easier for cocoa farmers to monitor and control the fermentation process more accurately. The effectiveness of this system can improve the quality of cocoa fermentation results by optimizing fermentation conditions through the right O2 and CO2 levels.
Co-Authors Abi Nazli Karuana Agus Rahman Hakim Amrillah, Nafira Alfi Zaini Farrah Fadhillah Hanum Firda Mahira Alfiata Chusna Lee Wah Lim Lia Anggresani Linggar Rahmat Dwiyono Maryudi Rahayu, Aster Sabila, Liya Yusrina Veranica Vivi Sisca