Reverse osmosis (RO) membrane desalination of brackish groundwater is employed to generate freshwater. 15% to 60% of the feed water becomes the RO concentrate waste, known as brine. However, the management of a RO concentrate stream remains challenging due to high costs and adverse environmenal impacts, especially in inland regions. In order to minimize the inland brine management cost and the negative environmental effects, additional water recovery from brine is needed. The major limitation to achieving high water recovery from the brine is mineral scaling by sparingly soluble salts on the membrane surface.
Prof. Haizhou Liu and his team have developed an inland desalination brine treatment technology that uses:
Normalized permeate flux decline as a function of cumulative normalized volume throughput. The brine without the UV/PS pre-treatment has a severe decline in permeate flux due to fouling.
Calcite saturation index revealing the pre-treatment with anti-scalant significantly increases the freshwater recovery.
The significant benefits of this technology are:
In water desalination for brine treatment to increase water recovery.