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All Journal Jurnal Kedokteran Brawijaya JPKMI (Jurnal Publikasi Kesehatan Masyarakat Indonesia) Sebatik Journal of Community Based Environmental Engineering and Management PREPOTIF : Jurnal Kesehatan Masyarakat Jurnal ABDINUS : Jurnal Pengabdian Nusantara Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal Pengabdian kepada Masyarakat Nusantara JEMSI (Jurnal Ekonomi, Manajemen, dan Akuntansi) Journal of Clinical Microbiology and Infectious Diseases
Lidya Handayani
School Of Medicine, Universitas Ciputra
Humanities Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Medicine & Pharmacology Neuroscience Nursing Public Health Social Sciences Other

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Cost-Efficient Treatment of Acidic Spent Electrolyte Using Alkaline Neutralization and Pressure Filtration in Precious-Metal Refining Handayani, Lidya; Andarista, Oktaviani
Journal of Community Based Environmental Engineering and Management Vol. 10 No. 1 (2026): March 2026
Publisher : Department of Environmental Engineering - Universitas Pasundan - Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jcbeem.v10i1.35888

Abstract

This study aims to evaluate the technical performance and cost efficiency of an integrated alkaline neutralization and pressure filtration system for eliminating hazardous liquid waste generated from acidic spent electrolyte in a precious-metal refining facility operating under a zero-liquid-discharge configuration. A field-scale quasi-experimental study was conducted at PT X, Indonesia, using NaOH conditioning followed by constant-pressure filtration at approximately 7000 psi. The objective was to determine the optimum operating conditions capable of transforming hazardous liquid waste into a stable solid residue while minimizing waste volume and handling costs. Results show that a NaOH dosage of 100 kg per batch produced a dense, filterable sludge, and that a filtration time of 60 minutes yielded the best dewatering performance. The initial sludge moisture content exceeded 20%, while the optimized process reduced the final moisture content to 14.36%, forming a compact and mechanically stable cake suitable for safe handling. On a system level, the treatment converted 730 m³/year of liquid hazardous waste into only 45.1 m³/year of dewatered sludge, representing a 94% reduction in off-site waste volume. Laboratory analysis confirmed effective metal immobilization, with sludge containing 23.64% Cu, 463 mg/kg Ag, and 1 mg/kg Au. The findings demonstrate that the NaOH-assisted filter press functions not only as a dewatering unit but as a strategic hazardous waste minimization tool. By eliminating the liquid phase and stabilizing metal-bearing residues, the system improves operational safety, regulatory compliance, and economic performance.
Co-Authors Adhitya Ginting Andarista, Oktaviani ANGGERAINI OKTARIDA Antonius Yansen Suryadarma Areta Idarto Ariesta Andriani, Nathania Disa Attliantika W, Firzhoneinsky Arsyahera Bainil Yulina Banjarnahor, Dharma Putra Perjuangan David Sukardi Kodrat Desak Nyoman Surya Suameitria Dewi Dewi Mayasari Erik Jaya Gunawan Florence Pribadi Gonaldy, Vincent Aurelius Hanna Tabita Hasianna Silitonga Hebert Adrianto I Putu Mahendra Keith, Jennifer Kencanawati, Nathania Dwi Minarni Wartiningsih Natalia Yuwono Saputra, I Wayan Agus Gede Manik Siahaan, Salmon Charles Siahaan, Salmon Charles P.T. Siahaan, Salmon Charles Pardoman Tua Sri Kusuma Dewi, Ida Ayu Suameitria, Desak Nyoman Surya Susanto, Vincentia Amaranggana Zebada Tanaya, Putu Wahyu Dyatmika Tangkas, Made Refika Widya Apsari Tanzillia, May Fanny Victor Setiawan Tandean Viena, Windi Clara