Abstract: A process of treating a wastewater stream containing an ammonia and carbon dioxide comprising: feeding the wastewater stream into a carbon dioxide degasser column; withdrawing a gaseous carbon dioxide rich stream as a first overhead fraction and a liquid carbon dioxide depleted stream as the first bottom fraction from the carbon dioxide degasser column; feeding the liquid carbon dioxide depleted stream into an ammonia stripper column; withdrawing a gaseous ammonia rich stream as a second overhead fraction and a purified wastewater stream containing at most 1,000 ppm dissolved ammonia as a second bottom fraction from the ammonia stripper column; feeding the gaseous ammonia rich stream and separately therefrom water into a quencher column; and withdrawing a gaseous vent gas stream as a third overhead fraction and the concentrated aqueous ammonia solution containing at least 5% by weight of dissolved ammonia as a third bottom fraction from the quencher column.

Abstract: A system 1 for the purification of an organic solvent, preferably an alcohol, comprising a first distillation column 10, a second distillation column 20, a vapor permeation unit 30 suitable for the dehydration of an organic solvent, wherein the system 1 further comprises a first heat integration sub-system 100 for exploiting both a sensible heat and optionally a latent heat, a second and a third heat integration sub-systems 200 and 300 for exploiting a latent heat, and wherein there is either a parallel configuration of the system 1 with a split feeding into both the first and the second distillation columns 10 and 20, or there is a series configuration of the system 1 in which there is feeding into only the first distillation column 10.