Wind-Powered Reverse Osmosis Water Desalination for Pacific Islands and Remote Coastal Communities

SPONSOR:
US Bureau of Reclamation (USBR)

PROJECT PERIOD:
10/01/04 – 06/30/06

ABSTRACT:
Water and energy are closely linked natural resources – the transportation, treatment, and distribution of water depends on low-cost energy; while power generation requires large volumes of water. Seawater desalination is a mature technology for increasing freshwater supply, but it is essentially a trade of energy for freshwater and is not a viable solution for regions where both water and energy are in short supply. This project discusses the development and application of a renewable-energy-driven reverse osmosis (RO) system for water desalination and the treatment and reuse of aquaculture wastewater. The system consists of (1) a wind-driven pumping subsystem, (2) a pressure-driven RO membrane desalination subsystem, and (3) a solar-driven feedback control module. The results of the pilot experiments indicated that the system, operated under wind speeds of 3 m s-1 or higher, can be used for brackish water desalination by reducing the salinity of feedwater with total dissolved solids (TDS) of over 3 000 mg L-1 to product water or permeate with a TDS of 200 mg L-1 or less. Results also indicated that the system can remove up to 97% of the nitrogenous wastes from the fish pond effluent and can recover and reuse up to 56% of the freshwater supply for fish pond operation.

View the related publications: CP-2013-07CP-2006-04

PRINCIPAL INVESTIGATOR

Clark C. K. Liu

Researcher (Emeritus), Water Resources Research Center
Professor, Civil and Environmental Engineering

Office: POST Building 203F
Phone: (808) 956-7658
Fax: (808) 956-5014
E-mail: liu@wiliki.eng.hawaii.edu