Desain Pabrik Garam Industri Dari Garam Rakyat K-3 Menggunakan Metode Teknologi Membran Nanofiltrasi

Valentina, Kelly and Claresta, Tania Farrel (2026) Desain Pabrik Garam Industri Dari Garam Rakyat K-3 Menggunakan Metode Teknologi Membran Nanofiltrasi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia has significant potential for community-based salt production due to its favorable geographical conditions. However, the quality and quantity of domestic salt production have not yet met national industrial demand. The country's dependence on imported industrial salt, which exceeds 2.7 million tons annually, represents a strategic challenge that must be addressed by improving domestic production capacity and product quality. This plant is designed to produce industrial-grade salt from K-3 quality community salt using nanofiltration membrane technology as the primary purification process. Nanofiltration is selected because of its ability to selectively remove divalent ions, including Ca²⁺, Mg²⁺, and SO₄²⁻, thereby producing high-purity salt under relatively mild operating conditions. Compared with the vacuum pan process, nanofiltration is more energy-efficient and produces higher-quality products than conventional brine washing. The plant is designed with a production capacity of 50,000 tons per year and operates for 330 days annually using K-3 quality community salt as the primary raw material. This production capacity is expected to substitute approximately 1.7% of Indonesia's annual industrial salt imports, supporting the government's target of achieving industrial salt self-sufficiency by 2027. The plant is planned to be located in Sumenep Regency, East Java, due to the abundant availability of raw materials and adequate supporting infrastructure. The production process begins with dissolving community salt, followed by a pretreatment stage in which the brine is purified using Na₂CO₃ and NaOH solutions to precipitate CaCO₃ and Mg(OH)₂, which are subsequently separated from the brine. The pretreated brine then undergoes nanofiltration to remove sulfate and potassium ions, producing a cleaner and more purified salt solution. The purified brine is subsequently fed into a Circulating Magma Vacuum Crystallizer, where salt crystals are formed and separated using a centrifuge. The resulting salt slurry is dried in a rotary dryer to remove residual moisture, producing solid salt crystals. Finally, the dried crystals undergo size reduction in a hammer mill to obtain a final product with a particle size of 50 mesh and a NaCl purity of 99%. Based on the plant design and economic evaluation, the required Fixed Capital Investment (FCI) is Rp546,008,029,785.66, the Working Capital Investment (WCI) is Rp96,354,358,197.47, resulting in a Total Capital Investment (TCI) of Rp642,362,387,983.13. The estimated annual Total Production Cost (TPC) is Rp221,001,194,100.77. Economic analysis indicates an Internal Rate of Return (IRR) of 16.31%, a Pay Out Time (POT) of 5.83 years, and a positive Net Present Value (NPV) of Rp354,232,250,642.16, demonstrating that the proposed industrial salt plant is economically feasible for implementation.
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Indonesia has a significant potential for the production of community-based salt due to its favorable geographical conditions, however, the quality and quantity of domestic production have not yet met national industrial demand. Dependence on imported industrial salt, which exceeds 2.7 million tons per year, represents a strategic issue that must be addressed through improvements in domestic production capacity and quality. This plant is designed to produce industrial-grade salt from K-3 quality community salt using nanofiltration membrane technology as the primary purification method. This technology is selected due to its ability to selectively remove divalent ions (Ca²⁺, Mg²⁺, and SO₄²⁻), thereby producing high-purity salt under relatively mild operating conditions. Consequently, nanofiltration is more energy-efficient than the vacuum pan method and yields higher product quality compared to conventional brine washing. The plant capacity is set at 50,000 tons per year, operating for 330 days annually, with K-3 quality community salt as the main raw material. This capacity is intended to substitute approximately 1.7% of the national industrial salt import demand, in line with the government’s program to achieve self-sufficiency in industrial salt by 2027. The plant is planned to be located in Sumenep Regency, East Java, due to the abundant availability of raw materials and adequate supporting infrastructure. The production process begins with the dissolution of community salt, followed by a pretreatment stage to purify the brine using Na₂CO₃ and NaOH solutions, resulting in the formation of CaCO₃ and Mg(OH)₂ precipitates, which are subsequently separated from the salt solution. The pretreatment is followed by a nanofiltration process that removes sulfate and potassium ions, producing a clearer and more purified brine. The purified brine is then fed into a crystallization process using a Circulating Magma Vacuum Crystallizer, producing salt crystals that are separated using a centrifuge. The separated salt slurry is subsequently dried in a rotary dryer to remove residual moisture, yielding solid salt crystals. The dried crystals are then subjected to size reduction using a hammer mill to obtain a final product size of 50 mesh with a NaCl purity of 99%. Based on the plant design and economic analysis conducted, the required Fixed Capital Investment (FCI) is Rp546.008.029.785,66; while the Working Capital Investment (WCI) amounts to Rp96.354.358.197,47; resulting in a Total Capital Investment (TCI) of Rp642.362.387.983,13. The annual Total Production Cost (TPC) is estimated at Rp221.001.194.100,77. With the estimated annual sales revenue, the project yields an Internal Rate of Return (IRR) of 16,31%, a Pay Out Time (POT) of 5,83 years, and a positive Net Present Value (NPV) of Rp354.232.250.642,16 indicating that the industrial salt plant is economically feasible to be established.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Industrial salt, import substitution, local salt, nanofiltration, Sumenep, Garam industri, garam rakyat, nanofiltrasi, substitusi impor
Subjects:	T Technology > TP Chemical technology > TP155.5 Chemical plants--Design and construction
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Chemical Engineering > 24201-(S1) Undergraduate Thesis
Depositing User:	Kelly Valentina
Date Deposited:	20 Jul 2026 08:55
Last Modified:	20 Jul 2026 08:55
URI:	http://repository.its.ac.id/id/eprint/135736

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