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All Journal Jurnal Teknik Kimia dan Lingkungan
Noor Isnaini Azkiya
Department of Chemical Engineering, Politeknik Negeri Malang, Jl. Soekarno Hatta No. 9, Malang 65141, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Materials Science & Nanotechnology

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Utilization of Yellow Shells (Cypraea moneta) in the Treatment of Cadmium Heavy Metal (Cd) Waste Noor Isnaini Azkiya; Rosita Dwi Chrisnandari; Wianthi Septia Witasari
Jurnal Teknik Kimia dan Lingkungan Vol. 7 No. 1 (2023): April 2023
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (350.217 KB) | DOI: 10.33795/jtkl.v7i1.327

Abstract

Cadmium (Cd) metal is a heavy metal that can cause environmental pollution if its levels are above the environmental quality standard value. Generally, industrial wastes such as paper industry waste contain heavy metal Cd with levels reaching 0.026 ppm. Meanwhile, the quality standard for Cd metal in the environment is 0.005 ppm. For this reason, it is necessary to process it to reduce the levels of Cd metal in the waste before being discharged into the environment. One way that can be used to reduce the levels of Cd metal is by adsorption method using Cypraea moneta clamshells containing chitin. This study used variations in the particle size of the shellfish adsorbent of 6 and 12 mesh. In addition, the ratio of the amount of adsorbate and adsorbent (mg:mg) is 1 : 0.5x106; 1 : 1x106; and 1 : 1.5x106. Based on the results obtained, it showed that the use of shellfish as an adsorbent was able to reduce Cd metal content up to 89%.
Xylanase Production by Aspergillus niger Using Agro-Industrial Residues and Tween Surfactants: A Non-Parametric Analysis Arif Rahman Hakim; Noor Isnaini Azkiya; Wahyuni Ningsih; Mufid Mufid; Arum Kusuma Wardani; Nisa’ Ulana Al Mukharromah
Jurnal Teknik Kimia dan Lingkungan Vol. 10 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v10i1.8854

Abstract

Xylanase plays a key role in hydrolyzing xylan, yet large-scale enzyme production remains limited by the high cost of purified xylan substrates. Although lignocellulosic agricultural residues offer a promising low-cost alternative, their effectiveness as substrates for Aspergillus niger and the influence of process additives on enzyme performance are not fully understood. This study addresses this gap by evaluating sugarcane bagasse and palm kernel cake as economical substrates and examining how substrate type, substrate concentration, and surfactant selection affect xylanase specific activity. Fermentation experiments were conducted using substrate concentrations of 1.5–3.0% (w/v) supplemented with Tween 20, Tween 60, or Tween 80, followed by statistical analysis using the Kruskal–Wallis test and Bonferroni-corrected Mann–Whitney U tests. Substrate concentration (p = 0.016) and surfactant type (p < 0.001) significantly influenced specific activity, whereas substrate type did not (p = 0.224). The highest activity (4.380 ± 0.052 IU/mg; median = 1.9113) was achieved using 3.0% palm kernel cake with Tween 20. These findings demonstrate that optimizing substrate load and surfactant choice is crucial for enhancing xylanase production from low-cost agro-industrial residues, providing practical insights for cost-efficient enzyme bioprocess development.
Producing Precipitated Calcium Carbonate (PCC) from CO2 Emissions during OFMSW Bio-Drying through Carbonation: A Preliminary Study Eko Naryono; Cucuk Evi Lusiani; Mochammad Agung Indra Iswara; Abdul Chalim; Noor Isnaini Azkiya; Amalia Dwi Ardini Putri; Allivia Retnaning Tyas; Kaliawan Kaliawan
Jurnal Teknik Kimia dan Lingkungan Vol. 10 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v10i1.9573

Abstract

Capturing CO₂ emissions during the bio-drying process of organic fraction municipal solid waste (OFMSW) presents an alternative approach to reducing CO₂ emissions in municipal solid waste (MSW) management. Absorption using an aqueous solution of Ca(OH)₂ is a viable CO₂ capture technology that produces precipitated calcium carbonate (PCC), a value-added product. The objectives of this study are to assess the impact of bio-drying aeration flow rate and absorption time in the Ca(OH)₂ solution on CO₂ absorption efficiency, the conversion of Ca(OH)₂, and the mass of the PCC product. The absorption process was performed in a semi-continuous bubble reactor with 15 L of 0.019 M Ca(OH)₂ aqueous solution. At bio-drying aeration flow rates of 5.1, 4.6, and 3.9 L/min/kg of waste, with CO₂ concentrations ranging from 1286 to 4395 ppm and temperatures between 23 to 30°C over a bio-drying period of 96 hours, it was observed that higher flow rates resulted in lower conversion rates of Ca(OH)₂ and reduced CO₂ absorption efficiency. The highest recorded conversion rates for Ca(OH)₂ and CO₂ absorption were 97.3% and 16.4%, respectively, yielding a PCC product of 4.8 g/kg of waste at an aeration flow rate of 3.9 L/min/kg waste and an absorption duration of 48 hours. FTIR and SEM analysis confirmed the presence of both calcite and aragonite crystal forms in the PCC product, as well as hydrated CaCO₃.
Co-Authors Abdul Chalim Allivia Retnaning Tyas Amalia Dwi Ardini Putri Arif Rahman Hakim Arum Kusuma Wardani Cucuk Evi Lusiani Eko Naryono Kaliawan Kaliawan Mochammad Agung Indra Iswara Mufid Mufid Nisa’ Ulana Al Mukharromah Rosita Dwi Chrisnandari Wahyuni Ningsih Wianthi Septia Witasari