Vacuum Crystallizer

GRELLIX design and manufacture customized industrial vacuum crystallizers for the treatment and reuse of wastewater,minimizing the liquid waste or sludge that is sent for disposal.Additionally, our wastewater crystallizers are the most efficient technology for the recovery of raw materials and by-products present in industrial effluents. Industrial crystallizers are an essential technology in circular economy and zero liquid discharge (ZLD) systems.

We have an extensive experience in the design, manufacture and installation of crystallization plants for wastewater treatment system or for zero liquid discharge (ZLD) projects. Each plant is designed to meet the specific requirements of the client and maximize its efficiency.

  • Minimize the waste volume to be managed up to 95%
  • The moisture content of the concentrate is less than 10%
  • Reduce the waste management costs significantly
  • Recover valuable raw materials and by-products dissolved in the wastewater
  • Capacity range:150L/H~1500L/H

Demonstration of Treatment Efficiency by  Vacuum Crystallizer

The vacuum crystallizer uses a vacuum pump to create a vacuum in the evaporation chamber. When the vacuum reaches -0.07MPa -0.09MPa, steam heat from an external source is introduced for heating, and the liquid starts boiling and evaporating at 55°C. The specially designed internal scraper continuously stirs the tank walls and wastewater to prevent crystallization from forming on the walls. While stirring, it effectively increases the evaporation and drying efficiency. Ultimately, the wastewater is treated into a solid or semi-solid concentrate, which is automatically discharged from the discharge port. External cooling water provides cooling for the condenser, and the steam generated during evaporation condenses into liquid water upon cooling. The distillate water is clear and transparent, meeting discharge standards or suitable for reuse.The concentrates can be disposal or recover as raw materials or by-products.

Applications of Vacuum Crystallizers

  • Treatment of effluents with a high contaminant load,such as crystallization of brines, concentration of spent working baths and concentration of extracts and fragrances, fouling liquids, brines, glues, inks and paints,etc.
  • Concentration and recovery of raw materials or by-products
  • Treatment of effluents when conventional techniques are not effective (as in the case of brines)
  • Maximum concentration of waste when external management costs are very high
  • Useful when treated effluents cannot be discharged (implementation of a zero discharge system)

Working Principle of Vacuum Crystallizer

  • The scraper evaporator starts by using a vacuum pump to extract vacuum and create negative pressure inside the cylinder. The diaphragm pump is used to pump the concentrated liquid into the scraper evaporator.
  • Live steam is used as the heating and evaporation heat source. The heat source enters the jacket layer to continuously heat and evaporate the wastewater.
  • Due to the vacuum inside the cylinder, the wastewater quickly begins to boil, generating a large amount of steam. The on-site circulating cooling water is used to exchange heat with the steam, and the steam is condensed into distilled water.
  • The scraper tightly adheres to the inner wall and continuously scrapes to prevent scaling on the wall, improving drying efficiency.
  • The wastewater is constantly evaporating, and the concentration of the residual wastewater gradually increases. As it loses water, it gradually approaches a solid state.
  • When the wastewater inside the cylinder is dried to a solid (moisture content below 10%), the equipment stops supplying heat. The physical characteristics of the paddle scraper are used to push the solid waste out of the cylinder.
  • The solid waste is collected and packaged for external disposal or recycling, and the evaporated water is discharged or reused after meeting the discharge standards.

Technical Data

Advantages of GRELLIX Vacuum Crystallizer

Industrial vacuum crystallizers allow the complete removal of liquid from an effluent, transforming the paste into a dry solid, usually crystallized. Its function is based on heat application with the aim of evaporating the liquid until a consistent solid is obtained.

Crystallization is an essential step in most resources recovery processes, as it allows the recovery and concentration of raw materials and by-products, such as fertilizers, acids, metals, minerals, salts, oils, etc. Furthermore, it contributes to reduce the final weight of the waste and thus reduce its transportation and management costs.

These are some of the main advantages of installing a crystallization plant:

  • Significant reduction in waste management costs:The vacuum crystallizer can remove over 90% of the water from the waste liquid and the moisture of the concentrated liquid/solid waste is less than 10% , minimizing the waste volume to be managed and lowering its transportation and management costs.
  • Implementation of a zero discharge system：The distilled water is clear and transparent, and can be fully reused in the production line. With low-temperature evaporation, no secondary pollution is generated, making zero discharge possible.
  • Energy-efficient: Evaporating 1 ton of waste liquid only requires approximately 1.1 tons of steam.
  • Safe and No Secondary Pollution: Physical distillation, low-temperature evaporation, no chemical additives required during the evaporation process, no secondary pollution.
  • Intelligent Design: High degree of automation, real-time monitoring of equipment operation via mobile or computer, with 24-hour operation and maintenance available in the backend. Simple operation, requiring no supervision.
  • Convenient Management: For a 5-ton daily processing capacity device, the equipment size is 4.38*1.60*3.50m, occupying a small space, easy to move, and only requires electricity and steam.
  • Reliable Quality: Heat exchangers and reactor bodies are typically made of 316L stainless steel. For special requirements, custom 2507 material can be used, ensuring reliable quality and smooth operation of the equipment.
  • Customized to Needs: Crystallizers can be customized based on the customer’s water quality and quantity requirements.
  • Durable and reliable: The core components of the equipment are sourced from leading international brands, ensuring stable and reliable operation with a service life of over 10 years.
  • Wide Applicability: The scraper evaporator is suitable for handling various high-salinity wastewater and oil-containing wastewater, with no risk of clogging or scaling.

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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 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
WeChat:13165068628