Evaporators are a key technology in ZLD (Zero Liquid Discharge) processes, i.e. systems designed to completely eliminate liquid discharge at the end of a water treatment cycle. In these plants, the evaporator is responsible for processing the final concentrate from other processes (such as reverse osmosis, nanofiltration or ultrafiltration), further concentrating the salts and separating a fraction of pure water, which can be reused in the production cycle.
In a ZLD process, the evaporator is often the final stage of physico-chemical separation, capable of handling wastewater with high salinity, high concentrations of organic or inorganic contaminants, and residues that cannot be treated using other technologies. Depending on the type of wastewater and energy requirements, mechanical vapour compression (MVC) evaporators, vacuum evaporators or multi-effect evaporators may be used, all of which are designed to optimise energy consumption and ensure maximum operational reliability.
The main advantages stem from the ability to recover up to 95–98% of the treated water, leaving behind a minimal amount of solid residue or concentrate, which can be easily managed through crystallisation, storage or controlled disposal facilities. This not only eliminates discharges into the environment, but also enables the recovery of raw materials (salts, metals, water) and significantly reduces wastewater management costs.
Uberplants Italia designs and supplies bespoke evaporators for both small-scale industrial plants and large-scale facilities, offering stand-alone solutions or systems integrated into complete ZLD plants. All systems can be supplied with heat recovery, advanced automation, corrosion-resistant materials and modular configurations. The entire process is designed to ensure high energy efficiency, low reagent consumption and reduced operating costs, making the solution sustainable in the long term as well.
The use of evaporators in ZLD processes is now a strategic choice for industrial sectors subject to stringent environmental constraints or seeking to achieve water self-sufficiency. In particular, they prove to be essential in the treatment of complex wastewater from chemical, pharmaceutical, food and metallurgical sources, or from landfill sites and waste treatment facilities. Uberplants Italia supports its customers every step of the way: from the initial consultation to bespoke design, right through to after-sales support.
