도서지역「해수담수화시설」 농축수 활용 방안 연구 - 저염분 해수담수화시설을 중심으로 - = The Utilization of Desalination Brine in Island Areas - A Focus on Low-Salinity Desalination Plants -

다국어 초록 (Multilingual Abstract)

Desalination plants in South Korea were installed with government aid from the mid-1990s. Furthermore, most of the plants were small scale to produce under 100 m3/day. Generally, brine produced by desalination plants was recognized as being twice as concentrated as seawater. Also, the discharging of brine into the ocean can have adverse impacts on the wider environment and marine ecosystem. However, many of the domestic desalination plants used low-salinity groundwater, so low-salinity brine with salt concentration lower than seawater was produced.
The largest number of desalination plants in Jeollanam-do have been installed and operated in Sinan-gun. The average total dissolved solids of feed water in 13 low-salinity desalination plants was 821 mg/L. The capacity of low-salinity desalination plants was from 6 m3/day to 300 m3/day. The desalination plants on Jara island and Ock island were invested as the oldest low-salinity desalination plant in Shinan-gun. 13 low-salinity desalination plants used 1,588 m3/day of low-salinity groundwater. And 691 m3 of low-salinity brine was released from desalination plant for a day.
This study investigated the characteristic of low-salinity brine in Shinan region and analyzed water quality to compare groundwater quality standard. In addition, growth rates and mineral contents of microgreens(Brassica oleracea var. gongylodes, Raphanus sativus L., Hordeum vulgare) were evaluated using low-salinity brine.
The total dissolved solids of low-salinity brine was 1,975 mg/L, which was about 2.2 times higher TDS than feed water. Moreover, the brine meets the needs for the water quality standard as microorganism, organic matters, heavy metals, agricultural pesticides, volatile organic compounds in 「Groundwater Act」except for chlorine. However, chlorine standard could not be applied according to the exception clause, so brine could be used as domestic water, Agricultural water and etc. The growth rates of Raphanus sativus L. growing low-salinity brine were higher than general groundwater. Furthermore, mineral contents of micro-greens could be increased when the higher salinity brine was used. The results show a need for greater support and improved public relations are needed to reuse low-salinity brine in island areas.

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