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All Journal JURNAL NASIONAL TEKNIK ELEKTRO Indonesian Journal of Chemical Engineering
Farrah Fadhillah Hanum
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Chemical Engineering, Chemistry & Bioengineering Chemistry Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology

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Utilization of Coal Ash as an Ameliorant to Enhance Growth and Nutrient Availability for Chili Plants (Capsicum annuum L.) on Peat Soil Farrah Fadhillah Hanum; Budi Setya Wardhana; Imran; Annisa Vada Febriani
Indonesian Journal of Chemical Engineering Vol. 2 No. 2 (2024)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/ijce.v2i2.1412

Abstract

Peat soil has limitations in nutrient content and low pH, thus requiring improvement efforts to support optimal plant growth.This study aims to examine the effect of adding coal ash (fly ash and bottom ash) on the growth of chili plants in peat soil media.The research design uses a combination of peat soil, manure, and coal ash from the power plant, which are tested under several treatments.The main parameters observed were plant height and nutrient analysis in the growing medium.The results show that the combination of peat soil, manure, and bottom ash from PLTU 2 (GA-B2B) produced the highest plant growth (26.3 cm).The addition of coal ash increases the CaO content in the growing medium, which plays a role in improving the chemical properties of the soil.However, nitrogen levels tend to decrease with the increase in coal ash dosage.Thus, coal ash has the potential to act as an ameliorant to improve the productivity of peat soil, especially when combined with organic fertilizers.
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 ANNISA VADA FEBRIANI Budi Setya Wardhana Dhias Cahya Hakika Imran Linggar Rahmat Dwiyono Sabila, Liya Yusrina