Simultaneous recovery of ammonium sulfate and ice from aqueous solution using eutectic freeze crystallization process
This study investigated the feasibility of eutectic freeze crystallization (EFC) process for ammonium sulfate (AS) salt recovery from 41 wt% AS solution. The EFC experiments were conducted using a 1 L double-jacketed crystallizer coupled with a recirculating chiller under varying freezing time, see...
Saved in:
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | en |
| Published: |
Elsevier B.V.
2025
|
| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/46775/1/J%20Crystal%20Growth%202025.pdf http://ir.unimas.my/id/eprint/46775/ https://www.sciencedirect.com/science/article/pii/S0022024824003944 https://doi.org/10.1016/j.jcrysgro.2024.127956 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | This study investigated the feasibility of eutectic freeze crystallization (EFC) process for ammonium sulfate (AS)
salt recovery from 41 wt% AS solution. The EFC experiments were conducted using a 1 L double-jacketed crystallizer coupled with a recirculating chiller under varying freezing time, seed mass and seed size. The EFC process demonstrated successful AS salt recovery and water purification with the highest ice purity attained at 96.28 %. The construction of a binary AS-water phase diagram allowed the determination of the eutectic tem perature, which was found to be − 19.06 ◦C at 40 wt% of AS solution. The results indicated that the increase in freezing time enhanced the AS nucleation rate, growth rate, yield and mean product crystal size. The intro
duction of seeding not only provided well-controlled crystal nucleation and growth during EFC process, but also
promoted the formation of larger, well-structured crystals and reduced agglomeration. Overall, the EFC process
is a viable and promising option for recovering AS from wastewater, which offers high potential towards
achieving zero liquid discharge goal, i.e. a sustainable and efficient approach in managing industrial effluent rich
in ammonium and sulfate contaminants. |
|---|