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Menampilkan 1–4 dari 4 artikel
Valorizing Boiler Combustion Residue into Activated Carbon for Tofu Effluent Treatment
Ahmad Taufikul Hidayat
; Rita Dwi Ratnani
; Indah Riwayati
Journal of Chemical Process and Material Technology
Vol 4
, No 2
(2025)
Tofu-processing wastewater is known for its high chemical oxygen demand (COD), strong color and odor, and acidic pH, making it unsuitable for direct discharge. This study assesses the effectiveness of a circular adsorptive treatment using activated carbon derived from boiler combustion residues (500–600 °C) and identifies contact time (t) as the critical kinetic variable for four key parameters: COD, color, odor, and pH. Batch tests were conducted with 200 mL of effluent, 25 g of adsorbent, and...
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Rice-Adulterated Roasting: How Traditional Practices Alter Acidity and Caffeine in Indonesian (Sumowono) Robusta Coffee (Coffea Canephora)
Gigih Ami Septiyana
; Indah Riwayati
; Laeli Kurniasari
Journal of Chemical Process and Material Technology
Vol 4
, No 2
(2025)
Coffee is a globally significant commodity, with Coffea canephora (robusta) accounting for 40–43% of production. Recent climate-induced yield declines have raised concerns about coffee quality and affordability. Traditional Indonesian practices, such as adding rice during roasting, offer potential solutions to modulate flavor and chemical composition. This study investigates the effects of rice adulteration (0–30% w/w) on the acidity and caffeine content of Sumowono Robusta coffee using UV-VIS s...
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FOAM MAT DRYING of RED SPINACH (Amaranthus tricolor L.)
Muhammad Iqbal Najih
; Indah Riwayati
; Indah Hartati
Journal of Chemical Process and Material Technology
Vol 4
, No 1
(2025)
Red spinach is a plant that provides various essential vitamins and minerals beneficial to human health. Creating red spinach powder as a convenient product can enhance its shelf life and ease of use while preserving its nutritional value and health benefits. The production of red spinach powder can be achieved through the foam mat drying technique. This research aims to evaluate the impact of different temperatures and maltodextrin concentrations on the production of spinach powder utilizing th...
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Effect of Extraction Variables on Phenolic Content and Antibacterial Activity of Frangipani (Plumeria alba) Leaf Extract by Microwave-Assisted Extraction (MAE)
Sekar Apriana
; Farikha Maharani
; Indah Riwayati
Journal of Chemical Process and Material Technology
Vol 4
, No 1
(2025)
Antimicrobial resistance is a significant global health issue, prompting the search for new antibacterial sources. This study aimed to evaluate the impact of extraction parameters, such as substrate-to-solvent ratio, extraction time, and microwave power, on the yield and total phenolic content (TPC) of Plumeria alba L. leaf extracts using Microwave-Assisted Extraction (MAE) and to assess their antibacterial activity against Escherichia coli. Optimization of the extraction process involved varyin...
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