Wastewater Recovery & Reuse - A Zero Liquid Discharge Study

There is a strong incentive in the state of California for commercial and industrial facilities to practice zero liquid discharge (ZLD) in the design and operation of water purification systems. This means that only solids leave the treatment system.

This presentation addresses the challenges presented in treating the wastewater from an EDR (electrodialysis reversal) treatment system utilized by a large recreational facility. The EDR system was installed to treat wellwater for all the water requirements in the facility.

The EDR treated effluent meets the quality requirements of the Safe Drinking Water Act, but generates approximately 60,000 gpd of wastewater particularly high in calcium, magnesium and silica compounds. After pilot testing, a treatment system was designed as follows: ...