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Abstract
ABSTRACT Osmotic dilution is an environmentally benign natural process where a fertiliser solution is used in forward osmosis as a draw solute to pull water from a feed solution. Good-quality water can be drawn out of seawater (desalination) and/or wastewater (dewatering), thus generating a nutrient-rich stream which can be used for irrigation purposes in agriculture. The problem of regeneration of draw solutes, which is energy-intensive, can be avoided to a great extent. This work focuses on the performance of a few inorganic fertilisers such as ammonium sulphate, magnesium sulphate and potassium chloride as draw solutions for drawing pure water from wastewater using two Indigenous thin film composite (TFC) membranes. Performance parameters like water flux and reverse solute flux are studied. Partial recovery of the resultant fertiliser solution is attempted by nanofiltration to achieve nutrient balance for possible large-scale application in a sustainable manner.
Published Version
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