Vacuum Evaporation Crystallization Process Diagram
High-concentration feed liquids can be directly fed into the GRELLIX Vacuum Crystallizer without pretreatment. Powered by steam and operating at 55°C under negative pressure, the system achieves boiling evaporation, separating 95% of clear distillate (meeting discharge standards or reusable) from the feedstock. Only <10% moisture-content solid/semi-solid residues remain, which can be safely disposed as hazardous waste or repurposed for raw material recovery/by-product extraction. This process slashes operational costs while delivering unmatched efficiency, transforming wastewater treatment into a value-driven operation for industries.
The Types of Wastewater Suitable for Vacuum Crystallizers Include:
1. High-Salinity Wastewater：Wastewater containing high concentrations of soluble inorganic salts (such as chlorides, sulfates, nitrates, etc.), which are prone to crystallization or scaling.
Examples:
NaCl, Na₂SO₄, KNO₃ wastewater (e.g., inorganic salt production)
Concentrated brine from reverse osmosis (RO) systems
MVR/Multi-effect evaporation mother liquor.
2. High-Concentration Organic Wastewater：Wastewater with high COD, high viscosity, and a tendency to coke, requiring the prevention of organic matter from adhering to the heat transfer surface.
Examples:
Cutting fluid wastewater, emulsified fluid wastewater, and cleaning wastewater generated in the machining industry.
3. Crystallizable Substance-Containing Wastewater：Wastewater in which solutes can crystallize and precipitate during evaporation, requiring simultaneous solid separation.
Examples:
Titanium Dioxide Industry: Ferrous sulfate (FeSO₄) wastewater from sulfuric acid process.
Lithium Battery Recycling: Lithium sulfate (Li₂SO₄) solution crystallization.
Fertilizer Production: Ammonium chloride (NH₄Cl) wastewater for salt recovery.
4. High-Viscosity Wastewater:Colloidal or viscous liquids with poor fluidity and low heat transfer efficiency.
Examples:
Petrochemical: Heavy oil wastewater, polymer-containing wastewater.
Adhesive/Gelatin Production: Colloidal wastewater (e.g., gelatin, resin synthesis).
Biofuel Industry: Viscous waste streams from biodiesel production.
5. Heavy Metal-Containing Wastewater:Wastewater that requires concentration of heavy metal ions to a crystalline state for subsequent recovery or solidification treatment.
Examples:
Electroplating: Nickel (Ni²⁺), chromium (Cr⁶⁺) wastewater.
Mining/Metallurgy: Acidic wastewater with copper (Cu²⁺), zinc (Zn²⁺).
Battery Manufacturing: Lead (Pb²⁺), cadmium (Cd²⁺) wastewater.
6. Mixed Complex Wastewater:Composite wastewater containing salts, organic matter, and suspended solids, requiring efficient separation.
Examples:
Landfill Leachate: High TDS, organic matter, and ammonia mixture.
Oil & Gas: Produced water with salts, oils, and dissolved organics.
Pulp & Paper: Black liquor with lignin, salts, and alkaline components.
Key Benefits of GRELLIX Scraped Crystallization Evaporation System
1、High-Efficiency Concentration & Volume Reduction
- Reduces wastewater volume by 95% with crystallized salt moisture content below 10%, achieving Zero Liquid Discharge (ZLD) and lowering disposal costs.
2、Resource Recovery & By-Product Generation
- Recovers raw materials (e.g., salts, heavy metals) or produces marketable by-products (e.g., Na₂SO₄, NH₄Cl) for added revenue.
3、Compact & Energy-Efficient System
- Integrated design with minimal footprint and low energy consumption, suitable for space-limited industrial plants.
4、High-Purity Treated Water
- Generates clear, reusable water compliant with discharge standards or applicable for process recycling.
Why Choose GRELLIX?
1、20+ Years of Expertise
- Proven solutions in wastewater treatment engineering, covering design, manufacturing, and commissioning.
2、End-to-End Service
- Customized equipment, on-site training, and lifelong technical support to maximize operational efficiency.
Contact US
With 20 years of proven expertise in industrial wastewater treatment engineering, we can customize vacuum evaporators/crystallizers, and provide comprehensive solutions for wastewater treatment, liquid waste minimization and zero liquid discharge systems for all industrial activities.
If you have any related needs, please contact us immediately. We can provide you with a free technical solution.
Phone:+86 13165068628
E-mail:grellix2005@gmail.com
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