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Eksergi: Chemical Engineering Journal
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 1410394X     EISSN : 24608203     DOI : https://doi.org/10.31315
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology
Eksergi is an open-access, peer-reviewed scientific journal that focuses on research and innovation in the fields of energy and renewable energy. The journal aims to provide a platform for scientists, researchers, engineers, and practitioners to share knowledge and advancements that contribute to sustainable development and energy transition. In addition to energy topics, the journal also accepts high-quality manuscripts related to, but not limited to, the following areas: Separation processes Bioprocesses related to food, energy, and environmental applications Wastewater treatment and resource recovery Process optimization and intensification Carbon capture, utilization, and storage (CCUS) Chemical reaction engineering and reactor design Life cycle assessment (LCA) and sustainability evaluation Process Design and Control Engineering Process Simulations Process System Engineering The journal welcomes original research articles, reviews, and short communications that demonstrate novelty, scientific rigor, and relevance to chemical engineering and interdisciplinary applications.
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 301 Documents
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Mechanistic Modeling of a Spiral-Wound Nanofiltration Module using DSPM-DE for High-Purity Salt Recovery from Desalination Brine Sugianto, Mohamad; Altway, Ali; Susianto
Eksergi Vol 23 No 1
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v23i1.15947

Abstract

Rejected brine is a concentrated NaCl stream whose elevated Ca²⁺, Mg²⁺, and SO₄²⁻ depress the quality of industrial salt. We built a mechanistic model of a spiral-wound KeenSen NF1-4040F nanofiltration (NF) element using the Donnan–Steric Pore Model with Dielectric Exclusion coupled to the Extended Nernst–Planck equations. Radial transport is coupled to axial mass balances and solved at steady, isothermal conditions over  bar and . Water flux  increases almost linearly with ; along the module  falls and  rises nearly linearly. Recovery increases with  but decreases with . Flux decomposition shows cations are convection-dominated, whereas anions carry larger shares of diffusion and electromigration. Predicted end-of-module rejections are ≈ 99.0-99.3%, ≈ 97.6-98.1%, ≈ 96.0-96.6%, ≈ 88-89%, and ≈ 74-75%, confirming divalent ≫ monovalent selectivity. Linking to product quality, the simulated permeate at  bar and  yields a conservative dry-salt purity of ~96.9 wt% NaCl when all non-halite salts co-precipitate. Under halite-first crystallization with a gypsum pre-step and bittern purge, only a minor fraction co-crystallizes, giving ≥98.5 wt% (≈99.5 wt% for a 20% co-crystallization assumption). Thus, operating at moderate-to-high  with moderate cross-flow not only maximizes recovery and divalent rejection but also supplies a permeate that can be crystallized to SNI-compliant high-purity salt.

Page 31 of 31 | Total Record : 301

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