A switchable forward osmosis system, and processes thereof

The present application provides a switchable forward osmosis system, and processes thereof. In particular, this application provides a process for treating an aqueous feed stream, comprising: forward osmosis using an aqueous draw solution having a draw solute concentration of 20 wt%, the draw solute comprising ionized trimethylamine and a counter ion; wherein, the feed stream: (i) comprises 5wt% total dissolved solids; (ii) is at a temperature of 520°C; (iii) is at a temperature between 30°C - 560°C; (iv) has an acidic pH or a basic pH; (v) comprises organic content; (vi) comprises suspended solids; (vii) or any combination of two or more of i) - v). Also provided herein are the related system and draw solution for performing the process, and various uses thereof for treating typically difficult to dewater feed streams.