Technology Overview:
Sequoia’s Zero Liquid Discharge (ZLD) and Vapor Recompression (VR) process technologies for water treatment are designed to address the growing challenges of industrial wastewater disposal. For many utilities, oil & gas fields, refineries, and recyclers, wastewater management is both costly and complex.
These waste streams often contain:
- High total dissolved solids (TDS), including chlorides, which are difficult to treat with conventional methods.
- Near-boiler compounds such as solvents, glycols, which complicate recycle and reuse of water.
- Toxic contaminants, including volatile organics and semi-volatiles which are soluble in water and that require safe separation.
Sequoia’s water evaporation technology using mechanical vapor recompression (MVR) efficiently separates water from these contaminants, producing boiler-feed quality water and reducing the volume of waste to be disposed. By recycling the latent heat of condensation, the process achieves energy efficiency, high recovery rates, and environmental compliance—making it a sustainable solution for industries worldwide.
Principle of Vapor Compression Evaporation:
Sequoia’s evaporation technology using vapor compression is built on the principle of evaporating water by reusing energy of water vapors within the system. In this process, wastewater is evaporated, and the resulting vapor is mechanically compressed. The compression raises the vapor’s temperature and pressure, allowing its latent heat of condensation to be recycled back into the system to evaporate more water.
This continuous cycle achieves two outcomes:
- Clean water recovery: Condensed vapor produces high quality water suitable for reuse in many industrial operations including as process water, as boiler and cooling tower make-up.
- Concentrated waste stream: Dissolved salts, chlorides, glycols, and other contaminants remain behind as a concentrated brine or sludge, reducing disposal volume and cost.
- Clean water recovery: Condensed vapor produces high quality water suitable for reuse in many industrial operations including as process water, as boiler and cooling tower make-up.
What Sequoia Offers:
- Units from 250 gallons/hour to 100,000 gallons/day feed capacities, covering small to large-scale operations.
- Modularization with maximum prefabrication and minimum site work, ensuring faster installation and lower installation costs.
- Long-term technical support for safe, reliable, and efficient operation over several years.
By recycling heat energy through compression, Sequoia’s vapor recompression systems deliver energy efficiency, scalability, and environmental compliance, making them a sustainable solution for industries facing wastewater disposal challenges.
Sequoia’s Zero Liquid Discharge (ZLD) Technology:
Sequoia’s Zero Liquid Discharge (ZLD) systems are designed not only to meet regulatory requirements but also to provide an economical way of managing water resources in utilities, refineries, and oil & gas fields. By recovering clean water and minimizing liquid waste, ZLD helps industries reduce disposal costs while supporting long-term environmental compliance.
Two-step Evaporation Process:
Our ZLD technology is based on a two-step evaporation process:
- Vapor recompression unit in the first stage, which efficiently separates clean water from contaminants.
- Forced circulation reboiler in the second stage, which concentrates the remaining brine into a crystallized residue, achieving complete zero liquid discharge.
This combination ensures maximum water recovery and safe solid waste management.
What Sequoia Offers:
- Precisely designed, robust skid-mounted units for easy transport and installation.
- Flexible installation options: indoors or outdoors depending on site requirements.
- Seamless integration with existing pretreatment or post-treatment systems.
- High quality reclaimed water suitable for reuse in cooling water systems and once through steam generators (OTSGs).
Applications Across Industries:
Sequoia’s Zero Liquid Discharge (ZLD) systems can be used across a wide range of industries where wastewater disposal, water recovery, and environmental compliance are critical.
