Development of minimum-salinity feedwater for reduction of unit production cost of reverse-osmosis desalination plants

Namsik Park; Chi Woong Jang; Roshina Babu

doi:10.3741/JKWRA.2016.49.5.431

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Development of minimum-salinity feedwater for reduction of unit production cost of reverse-osmosis desalination plants 역삼투 담수화 시설의 생산단가 절감을 위한 저 염도 지하 기수 개발

31 May 2016. pp. 431-438

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Abstract

Large energy consumption is one of the main weaknesses of RO desalination. A new method is proposed to reduce the energy consumption of RO desalination which depends on the salinity of the feedwater. Low salinity feedwater can be obtained using groundwater wells which extracts both fresh groundwater and subsurface sea water. Subsurface feedwater is advantageous in overcoming other problems associated with surface seawater intakes. Salinities of groundwater depend on a number of factors. In this work a new simulation-optimization model is proposed to identify well locations and pumping rates with would provide the required design flow rate with the minimum salinity. When groundwater is developed in a coastal area, the saltwater wedge advances inland and may contaminate existing groundwater wells, which must be prevented. The model can protect existing wells while developing minimum salinity feedwater. Examples are provided to demonstrate the usage of the model.

Keywords

RO desalination

energy consumption

minimum salinity feedwater

simulation-optimization model

역삼투 해수 담수화 공법의 주요 단점으로 여겨지고 있는 에너지 소비량을 줄이기 위한 방편으로 해안선을 통하여 바다로 유출되는 담수 지하수를 활용하여 낮은 염도의 원수를 확보하는 방안을 제시하였다. 저 염도 지하 염수는 담수화 비용 뿐 아니라 표류 해수 취수의 알려진 단점을 극복하는 데도 유리하다. 지하 염수의 염도는 해안선을 통하여 바다로 유출되는 담수 지하수량의 영향을 크게 받는다. 본 연구에서는 담수화 시설에 필요한 수량을 최저 염도로 충족시킬 수 있는 지하 염수 관정의 위치 및 양수량 분포를 산정할 수 있는 최적 전산설계모델을 개발하였다. 해안 지역에서 지하 염수를 개발하면 대수층으로 해수가 추가 침투하여 다른 사용자의 지하수 관정을 오염시킬 수 있다. 본 모델은 지하 염수 관정의 최적 설계 시에 기존 지하수 관정을 해수 침투로부터 보호할 수 있도록 구성되었다.

키워드

역삼투 해수담수화

에너지 소비량

최저염도 원수

최적설계 전산모델

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Information

Publisher :KOREA WATER RESOURECES ASSOCIATION
Publisher(Ko) :한국수자원학회
Journal Title :Journal of Korea Water Resources Association
Journal Title(Ko) :한국수자원학회 논문집
Volume : 49
No :5
Pages :431-438
Received Date : 2016-03-31
Revised Date : 2016-04-07
Accepted Date : 2016-04-07
DOI :https://doi.org/10.3741/JKWRA.2016.49.5.431

Journal of Korea Water Resources Association ISSN:2799-8746(Print) 2799-8754(Online) 한국수자원학회 논문집

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