소규모 해수담수화시설 물 생산량 제고 방안 - 전라남도 해수담수화시설을 중심으로 - = A Study on the Improvement of Water Production in Small-Scale Desalination Plants

다국어 초록 (Multilingual Abstract)

Desalination was a water treatment process that involved converting saline water to fresh water. Desalination generated an estimated 0.03 hundred million ㎥/day of fresh water in Korea. But, water shortage problems in the island area were not solved regarding the low capacity of desalination plants, the low amount of available salinity groundwater, etc. Furthermore, the low recovery rate of freshwater, lack of expertise of local operators, water leakage and contamination by old pipelines needed to be improved. This study used a reverse osmosis system projection program to compare compared desalination processes to improve water production and decrease electricity consumption.
It was investigated that over 80 % of small-scale desalination plants in Jeollanam-do produced 50 ㎥/day. The total dissolved solids of feed water were at least 115 mg/L, up to 28,273 mg/L, an average of 5,676 mg/L, and the water temperature of raw water was at least 5.2 ℃, up to 28.1 ℃, and the average of 17.0 ℃. Based on the investigation results, plant capacity and the total dissolved solids of the final freshwater for performance simulation were set at 50 ㎥/day, 500 mg/L, and the total dissolved solids and temperature of raw water were set at 6,500 mg/L, and 17 ℃. The process compared and analyzed changes in the quality and quantity of freshwater by designing the ‘1st RO’ process, the ‘1st RO + ERD’ process with an energy recovery device added, the ‘1st RO + Recirculation’ process, and the ‘2nd RO + Recirculation’ process.
In the ‘1st RO’ process, 200 ㎥/day of feed water was required to produce 50 ㎥/day of fresh water, but in the ‘1st RO + Recirculation’ process and the ‘2nd RO + Recirculation’ process, the amount of feed water required could be reduced to 83.3 ㎥/day and 66.7 ㎥/day. The ‘1st RO’ process consumed 1.47 kWh/㎥. However, in the ‘1st RO + ERD’ process, it is lowered to 0.45 kWh/㎥. The recovery rate was increased by 75 % in the ‘2nd RO + Recirculation’ process. Finally, reducing the electric energy consumed in freshwater production in summer was possible.
When replacing old desalination plants or installing new ones, the ‘1st RO + ERD’ process, which can lower electricity consumption, should be considered rather than the ‘1st RO’ process, the ‘1st RO + Recirculation’ process and the ‘2nd RO + Recirculation’ process, which could increase waster production.

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