Zero Liquid Discharge for Environmental Protection
15 Jan 2018
Stricter regulations on the use and discharge of industrial water require advanced processing solutions. GEA's zero liquid discharge (ZLD) technologies provide efficient wastewater processing systems that improve in-plant water reuse, enhance product recovery, and convert fluid discharge into manageable solid waste.
GEA developed a hybrid ZLD process for a molybdenum production facility. The wastewater contains various sulfates and sodium chloride. With a wastewater capacity of up to 110 cubic meters per hour, the process consists of a brine purification pretreatment section. That is followed by a reverse osmosis pre-concentration unit and subsequent concentration in a falling film evaporator driven by mechanical vapor recompression. Crystallization and solid separation completes the process, which produces pure water for reuse in the production.
Water Recycling and Conservation
Operating successfully with verified results, critical compound concentrations (such as fouling and incrustation-forming components like colloidal SiO2, Mn, and Fe) have been reduced below critical operational thresholds.
Water use and conservation are key considerations for global processing industries, particularly those affected by the scarcity of available water sources or suitable wastewater recipients. We supply complete Zero Liquid Discharge (ZLD) lines comprising centrifugal separation, membrane filtration, evaporation, crystallization, and drying technologies, offering the following benefits:
- Meeting stringent discharge regulations
- Treating and recovering valuable product from waste streams
- Improving management of internal process water streams
- Reducing the need to draw fresh water
- Minimizing energy consumption, transportation, and disposal costs
- Utilizing corrosion-resistant materials
- Integrating advanced automation systems
