Crystallizers

Crystallizers

Meeting stringent zero-liquid-discharge requirements also requires a crystallizer to reduce brine concentrate to a dry solid. Recovered water can be recycled back to plant processes, while an easy-to-handle dry solid can be safely disposed of in an approved landfill.

Crystallizer benefits include:

Ease of use - With simple color graphic controls and an automatic wash system, GE’s crystallizers are easy to operate.

Ease of installation - Skid-mounted, fully packaged systems with all auxiliary equipment and controls.

Valuable product recovery - Systems can be designed to recover specific salts from a waste stream.

Expertise in zero liquid discharge - GE has more than 35 years of experience developing and implementing thermal technologies to solve zero liquid discharge challenges for customers worldwide.

Maximized waste steam use. Crystallizer systems use mechanical vapor recompression (MVR) technology to recycle the steam vapor, minimizing energy consumption and costs.

Forced-Circulation, Vapor Compression Crystallizer Process Flow

1
 Wastewater is pumped to the crystallizer
5
 Most of the brine is recirculated back to the heater. A small stream from the recirculating loop is sent to a centrifuge or filter to separate remaining water from the crystals
2
 Wastewater joins the recirculating brine and is pumped to a shell and tube heat exchanger (heater). Because the tubes are flooded, the brine is under pressure and will not boil. This prevents scaling in the tubes.
6
 The vapor from evaporation passes through a mist eliminator to remove entrained particles.
3
 The recirculating brine enters the crystallizer vapor body at an angle, where it swirls in a vortex. A small amount of the brine evaporates.
7
 The vapor is compressed in a vapor compressor. The compressor vapor heats the recirculating brine when it condenses on the shell side of the heater. (Plant steam can also be used to heat the slurry.)
4
 As water is evaporated from the brine, crystals form.
8
 Condensate is collected and may be recycled to other processes requiring high quality water.

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