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All Journal CHEESA: Chemical Engineering Research Articles
Muhammad Haviz
King Fahd University Petroleum and Mineral
Chemical Engineering, Chemistry & Bioengineering Chemistry

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Coffee Waste as a Potential Adsorbent for Peat Water Treatment Rahma Amalia; Sarah Fiebrina Heraningsih; Oki Alfernando; Sri Mundarti; Muhammad Haviz; Nadia Elvina; Sonia Nizal Putri; Resi Lisma Kinasih; Asmara; Yuzi Chantika Pratama; Ahmad Fadhilah Ashidiqie
CHEESA: Chemical Engineering Research Articles Vol. 8 No. 1 (2025)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v8i1.22320.23-34

Abstract

Peat water is characterized by high acidity, turbidity, and poor sensory qualities, which limit its usability. This study evaluated the effectiveness of thermally activated coffee waste adsorbent (CWA) for peat water treatment. CWA was prepared by heating coffee waste at 250°C, followed by washing and drying at 60°C. Batch adsorption experiments were conducted using 1–3 g of CWA in 200 mL of peat water at 30°C, stirred at 150 rpm for 30 minutes. The results revealed significant improvements in water quality: pH increased from 3.85 to 4.62; turbidity was reduced by 99.37% (from 75 to 0.47 NTU); conductivity decreased by 30.7% (from 424 to 294 ?S/cm); and total dissolved solids (TDS) dropped by 93.3% (from 208 to 14 ppm). The Langmuir isotherm model (R² = 0.7297) provided a better fit than the Freundlich model (R² = 0.5845), indicating monolayer adsorption behavior with a maximum capacity of 0.1634 mg/g and a favorable separation factor (RL = 0.0057). Sensory evaluation confirmed enhanced color and odor. These findings support the use of CWA as a sustainable and low-cost adsorbent for improving peat water quality.
Evaluation of Heat Loss Effect on Package Boiler Performance (5007-U) in the Utility Unit of Urea Fertilizer Industry Rizka Wulandari Putri; M. Fabian Merdeka; Rona Alisya; Rahmatullah Rahmatullah; Muhammad Haviz
CHEESA: Chemical Engineering Research Articles Vol. 7 No. 2 (2024)
Publisher : Universitas PGRI Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/cheesa.v7i2.19292.67-74

Abstract

Package boiler (PB) is a utility unit essential for producing steam by heating Boiler Feed Water (BFW) through the combustion of natural gas with air. Therefore, this study aimed to investigate the effect of heat loss on PB efficiency. To achieve this, direct and indirect methods were adopted, with data collected between 4 July and 29 August 2023. The results showed that PB efficiency in the fertilizer industry during this period ranged from 76.06% to 80.71%. On August 29, 2023, under optimal conditions, an efficiency of 80.71% was achieved, while a significant drop to 65.44% occurred during the 6th week on August 8, 2023, due to low oxygen (O2) levels. Flue gas analysis on August 29, 2023, obtained 3.64% excess O2, 11.17% carbon dioxide (CO2), and 0.04% carbon monoxide (CO). PB performance was influenced by heat loss from the dry flue gas, hydrogen (H2) content on flue gas, moisture in air and fuel, incomplete combustion, as well as radiation and convection phenomena.
Co-Authors Ahmad Fadhilah Ashidiqie Asmara M. Fabian Merdeka Nadia Elvina Oki Alfernando Rahma Amalia Rahmatullah Rahmatullah Resi Lisma Kinasih Rizka Wulandari Putri Rona Alisya Sarah Fiebrina Heraningsih Sonia Nizal Putri Sri Mundarti Yuzi Chantika Pratama