Zero liquid discharge (ZLD) FAQ for Xylem’s Vacom One-Step
Explore the most common questions about zero liquid discharge (ZLD) and how Xylem’s Vacom One-Step approach can simplify system design, reduce operational complexity, and improve total cost of ownership.
Typically installed at the end of a treatment train, Xylem’s Vacom One-Step evaporation and crystallization system can help customers achieve zero liquid discharge (ZLD) in wastewater applications. It is often paired with upstream processes such as reverse osmosis (RO) and other treatment solutions, depending on the application. Below are frequently asked questions about the Vacom One-Step system and how it works.
Frequently asked questions
Most customers justify zero liquid discharge (ZLD) by comparing it to what they're already spending on hauling, disposal, chemicals, and compliance risk. When you factor in those ongoing costs, plus future regulatory exposure, ZLD often becomes a lower total cost of ownership over time.
Traditional ZLD is a multi-unit system with separate evaporators, crystallizers, and extensive pretreatment. Xylem’s Vacom One-Step simplifies that into a single, integrated process, which means fewer components, fewer failure points, faster startup, and easier operation.
Compared to traditional ZLD, pretreatment is typically minimal. We usually recommend basic steps like pH adjustment and removal of large solids or free oil, but the system is designed to handle high TDS, suspended solids, and even oils. The exact requirements depend on your water, so we validate that through lab or pilot testing.
The system is specifically designed to avoid scaling and fouling. Internally, high velocities keep solids suspended and prevent buildup on heat transfer surfaces. That's a key difference from traditional systems that struggle with fouling. Fewer components and simpler design also improve reliability and uptime.
Because the system is modular and factory built, we can fabricate in parallel with site preparation. Once on-site, commissioning is typically measured in weeks, not months. That speed reduces project risk and gets you to operation and cost savings much faster than traditional stick-built ZLD.
That's a fair reaction, we hear it often. Xylem’s Vacom One-Step integrates many steps into a single process. The best way to validate that is through lab or pilot testing on your water, so you can see actual performance before making a decision.