Geothermal Salt Factory (GSF) Design in Parangwedang Geothermal, Bantul, Special Region of Yogyakarta
Indonesia has the largest geothermal energy potential in the world with potential value ±28 GWe, but the potential of geothermal low enthalpy is still not utilized properly. On the other hand, improvement in the salt industry needs to be done because the salt industry in Indonesia has not been able to meet domestic salt demand. Domestic salt supply deficit is caused by the salt industry in Indonesia just relies on salt traditional farmers who are very dependent on the sunlight and the absence of a modern and sustainable salt-making industry. Therefore, the authors made a salt factory design using low enthalpy geothermal by utilizing Parangwedang geothermal as a heat source energy. Parangwedang geothermal is located in the Special Region of Yogyakarta with existence manifestation as a hot spring. Based on previous research, the potential of Parangwedang geothermal was 10 MWe. The reservoir rock may have a temperature range 115 °C and the hot spring fluid temperature 43 °C. The hot spring distance from the seashore is 403 meters with elevation reach 8 meters. The method used in this study is literature study and data collection in the field. Literature data is obtained from various sources and then compiled and grouped for the design of the salt factory that utilizes low enthalpy geothermal energy. This factory system will involve two pumps, one of which will drain the hot water from the Parangwedang hot spring and the other will drain the water from the ocean to the salt production pan. A boiling tank and condenser are used to boil the sea. Hot water from the boiling tank is used for drying the salt brine and brine is dried in the salt pan. In the result, the authors calculated factory production capacity, the GSF production capacity is ±14 tons salt each year.
Akridge, G. D. (2007). Methods for calculating evaporation rates during salt production. Journal of Archaeological Science, 35, 1453-1462.
Badan Pusat Statistik. (2018). Volume dan Nilai Impor Garam Indonesia. http://databoks.katadata.co.id/datapublish/2018/03/19/kuota-impor-garam-2018-sebesar-37-juta-ton.
BMKG. (2018). Salinitas. Buletin Iklim Maritim BMKG, 2(2018), 47-49.
ESDM. (2017). Potensi Panas Bumi Indonesia (Jilid 1). Direktorat Panas Bumi, Ditjen EBTKE.
Fauzi, A. (2015). Geothermal resources and reserves in Indonesia: An updated revision. Journal Geothermal Energy Science, 3, 1-6.
Handoyo, G., Agus, A. D., & Subardjo. (2017). Peta kerawanan tsunami serta rancangan jalur evakuasi di pantai desa Parangtritis kecamatan Kretek kabupaten Bantul Daerah Istimewa Yogyakarta. Jurnal Kelautan, 10(2), 117.
Hassan, A. (2009). Mesin pengering produk pertanian bertenaga panas bumi. Jurnal Teknik Lingkungan, 10(2), 153-160.
Idral, A., E. et al. (2003). Penyelidikan terpadu geologi, geokimia dan geofisika daerah panas bumi Parangtritis. Colloquium result of inventory Event of Ministry of Mineral Resource.
Jami, A. S., Suharno, & Netty, T. (2017). Faktor-faktor yang memengaruhi permintaan dan efektivitas kebijakan impor garam Indonesia. Buletin Ilmiah Litbang Perdagangan, 11(1), 43-68.
Jeong, Chorl. (2018). Heat exchanger. https://charliestory.tistory.com/m/35.
Juliarka, Restu, B., & Niasari, S. W. (2016). Geothermal exploration using geochemical data; Study case: Parang Wedang geothermal field, Indonesia. AIP Conference Proceedings (2016).
Riley, J. P. (1975). Analytical chemistry of sea water. Chemical oceanography, (v.3., pp. 193-514). Academic Press London.
US Department of Energy (1977). Applications of geothermal resources in the evaporation and crystallization industry. Final Report October 1977