Abstract:
Water reclamation systems based on dense membrane treatment such as reverse osmosis (RO) are being progressively
applied to meet water quantity and quality requirements for a range of urban and environmental applications. The RO concentrate
usually represents 25% of the feed water flow and contains the organic and inorganic contaminants at higher concentrations. The
amount of RO concentrate waste water requiring disposal must be as minimal as possible (near zero-discharge); the recovery of
high quality water should be as high as possible. Management issues related to proper treatment and disposal of RO concentrate
are an important aspect of sustainable water reclamation practice. The RO concentrate is a significant component of water
treatment process and poorly managed treatment and disposal of RO concentrate causes significant consequences. Even in a
small to medium size water reclamation plant in Sydney, 2000 kL of water is treated by RO and around 300 kL of RO
concentrate is produced daily. This RO concentrate consists of a high level of organics (25-30 mg/L of DOC which is mainly
refractory organics) and inorganic salts (Cl- = 400-650 mg/L, Na+ = 400-500 mg/L, Ca2+ = 93-200 mg/L, K+ = 63-100 mg/L). The
RO concentrate waste disposal cost can be minimized and made valuable by reclaiming the RO concentrate with the aim of
producing salts from the solutes and recycling the water to the treatment system. Technologies for recovery of high salt
concentration from the RO concentrate such as forward osmosis (FO) and membrane distillation (MD) are either energy intensive
or not developed in large scale. In this study, we highlight a sustainable membrane adsorption hybrid system in treating this RO
concentrate.
