Zero Liquid Discharge (ZLD) and Volume Reduction Through Evaporation & Crystallization

Expertise in All Major Industries

Fresh water scarcity and concerns for environmental impact resulting from industrial use places a high degree of importance on recycling and reuse of this valuable resource.

Regulatory limits are becoming progressively strict on the limits of aqueous discharge and wastewater treatment. Management of the entire water cycle for industrial applications are driving efficiency and innovation towards zero liquid discharge (ZLD).

HPD, with decades of innovation in evaporation and crystallization technology, provides a wide array of experience in volume reduction and zero liquid discharge over many applications:

• Power generation (fossil and nuclear fuel)
• Oil & Gas field produced water
• Oil & Gas refining
• Chemical processing
• SAGD (Steam Assisted Gravity Drainage)
• Landfill leachate

Utilizing the HPD's experience with over 675 installations worldwide, waste reduction and ZLD facilities are often designed and built on a lump-sum, turnkey basis. This ensures that our customers can depend on the expertise and single point of responsibility for these large, complex projects.

HPD offers several options in designing the optimal system to achieve each unique customer requirement for achieving zero discharge or waste reduction objectives, water treatment efficiency, and energy consumption. HPD offers system capacities ranging from 50 gpm to greater than 1200 gpm.

Brine concentrators using seeded slurry or unseeded falling film evaporators are an excellent technology for energy efficiency with water recovery of greater than 90% as high-purity distillate. Recovered water in a brine concentrator is suitable as cooling tower or boiler makeup, recycled to plant processes, and in rare applications, used as potable water. These systems can be driven by mechanical vapor recompression (MVR) or with live steam if allowed by plant economies.

Further concentration of effluents or recovery of valuable byproducts are achieved using brine crystallizer systems. When used in conjunction with brine concentrators, comprise a true zero liquid discharge system. These efficient units use MVR technology to recycle the vapor to reduce energy usage and operating costs.