IWE S.r.l.
Vacuum evaporators and concentrators
IWE (Industrial Water Evaporators) of Pantigliate near Milan has designed and manufactured energy-efficient vacuum evaporators and concentrators since 1982, including ATEX versions. The equipment is built to order, and the plant has its own laboratory with pilot units.
An evaporator separates dissolved non-volatile substances into demineralized water (distillate) and a concentrated residue. The volume of wastewater requiring disposal can be reduced by up to 99%, and the distillate often returns to the process. Evaporators can be combined with physico-chemical and biological plants, which cannot cope on their own with wastewater containing high concentrations of contaminants.
Surface treatment applications
- concentration of spent baths and wastewater from plating plants, recovery of chromium, copper and nickel baths,
- concentration of wastewater from washing, pre-paint preparation and chromate phosphating in paint shops,
- further concentration of brines after reverse osmosis and recovery of dissolved salts.
Evaporator series
| Heat pump (electric power) | capacity from 5 to 4000 l/h. HP ME series (single stage), HP DE (two stages, 33% less energy), HP DRY (shovelable concentrate), HP ME R and HP DE R (with scraper for heavily fouling products) |
|---|---|
| Thermal energy (hot water or steam) | capacity from 100 to 12,000 l/h, also from heat recovery or cogeneration. HWS ME, DE (50% less thermal energy), TE (over 66% less) series and scraper versions ME R and DE R |
| Materials | AISI 316L, duplex (SAF 2205), super duplex (SAF 2507), titanium, silicon carbide, graphite, fluorocarbon resins (Halar). CR version for highly corrosive liquids, e.g. chromium baths |
Submerged-plate heat exchangers
Tubular exchangers and coils have very small gaps between surfaces, so deposits are difficult to remove from them. IWE uses parallel submerged plates with plenty of free space: simple rinsing or quick removal through a tool-free door is enough. An automatic brush cleaning system for the exchangers is also available.
The evaporator is sized to the volume and composition of the wastewater. Please get in touch: we will prepare a proposal for your plant.