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All Journal BERKALA SAINSTEK Jurnal Teknik Kimia
Dyah Retno Sawitri
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Mathematics Physics

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Pembuatan Bio-Komposit Dari Ampas Tebu dengan Matrik Karet Jenis Ribbed Smoked Sheet Grade Cutting Arifianto Adi Wibowo; Dyah Retno Sawitri; Arif Hidayat
Jurnal Teknik Kimia Vol. 21 No. 01 (2026): JURNAL TEKNIK KIMIA
Publisher : Department of Chemical Engineering, Universitas Pembangunan Nasional Veteran Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/jurnaltekkim.v21i01.68

Abstract

Penelitian ini bertujuan untuk mengembangkan bio-komposit dari ampas tebu dengan matriks karet jenis ribbed smoked sheet (RSS) grade cutting, menggunakan variasi perbandingan massa serat dan perlakuan NaOH untuk meningkatkan sifat mekanik komposit. Metode yang digunakan meliputi preparasi serat ampas tebu dengan perlakuan NaOH untuk menghilangkan lignin dan hemiselulosa, serta proses cetak tekan panas dalam pembuatan komposit. Variasi dilakukan pada perbandingan massa serat terhadap matriks dan jenis serat (serat panjang dan serat serbuk). Hasil pengujian menunjukkan bahwa perlakuan NaOH pada serat secara signifikan meningkatkan kekuatan tarik dan tegangan bending komposit. Kekuatan tarik tertinggi diperoleh pada perbandingan serat 1:5 untuk serat yang diperlakukan dengan NaOH, sedangkan tegangan bending tertinggi diperoleh pada perbandingan 1:8 dengan serat serbuk. Secara keseluruhan, penggunaan serat serbuk menunjukkan peningkatan yang lebih besar pada sifat lentur, sementara serat panjang memberikan kekuatan tarik yang lebih baik. Perlakuan NaOH meningkatkan adhesi antara serat dan matriks, yang berkontribusi terhadap peningkatan sifat mekanik. Penelitian ini menunjukkan potensi besar ampas tebu sebagai bahan penguat yang ramah lingkungan dalam pembuatan komposit
Harnessing Chicken Eggshells as a Natural Coagulant for Palm Oil Refinery Wastewater Treatment Bimmo Dwi Hartono; Dyah Retno Sawitri; Sholeh Ma’mun
BERKALA SAINSTEK Vol. 13 No. 4 (2025)
Publisher : University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v13i4.60004

Abstract

The increasing production of palm oil refineries in Pontianak, West Kalimantan, Indonesia has resulted in a significant rise in wastewater generation containing high levels of Total Suspended Solids (TSS), Chemical Oxygen Demand (COD), and phosphate (PO43-). This study aims to evaluate the effectiveness of chicken eggshell powder as a natural coagulant in reducing these pollutants. Wastewater samples were collected from PT Wilmar Cahaya Indonesia Tbk., Pontianak, and treated using eggshell powder calcined at 900 °C and sieved into 20, 30, and 50 mesh sizes. The experimental design was conducted to examine the effects of varying coagulant concentrations (5, 8, and 11% w/w) in combination with different mixing durations (30, 60, and 90 minutes). The results show that the optimal TSS reduction reached 35.31 mg/L, corresponding to a removal efficiency of 91.28%, achieved at 50 mesh particle size, 11% dosage, and 60 minutes of mixing. COD reduction was most effective at 64.36 mg/L, with a removal efficiency of 90.56%, obtained under the conditions of 30 mesh, 5% dosage, and 30 minutes of mixing. Meanwhile, phosphate removal reached 6.80 mg/L, equivalent to a removal efficiency of 69.78%, at 11% dosage and 60 minutes of mixing. Although TSS and COD levels met environmental quality standards, phosphate concentrations remained above permissible limits, indicating the need for further process optimization. These findings highlight the potential of eggshell powder as a low-cost, eco-friendly alternative for palm oil refinery wastewater treatment in Indonesia.
Co-Authors ARIF HIDAYAT Arifianto Adi Wibowo Bimmo Dwi Hartono Sholeh Ma’mun