ZLD Power Plant Saves Millions With Rental Equipment

Zld Power Plant Project Start Up

ZLD Power Plant Project Summary

A zero liquid discharge (ZLD) power plant in the western United States was experiencing problems with their cold lime softening system resulting in an inability to send cooling tower blowdown water to the evaporator. As a result, four millions gallons of untreatable water had accumulated and needed offsite disposal or treatment onsite. Cost estimates for hauling and offsite disposal of the water was approximately $1.00 per gallon for a total of $4,000,000. WaterSurplus was contracted to help mitigate the problem by reducing the volume of untreatable water by 85%.


Within two weeks of being contacted, the WaterSurplus Rental Division mobilized a temporary water treatment plant consisting of three 125 GPM multimedia filter tanks, three 125 GPM activated carbon filter tanks, two 150 GPM brackish reverse osmosis skids, and one 75 GPM reject recovery reverse osmosis skid. The WaterSurplus Service Division provided startup and initial operating services. Surplus brackish reverse osmosis membrane elements were used in the two 150 GPM primary RO units. Surplus desalination membrane elements were used in the 75 GPM reject recovery RO unit. Learn more about the significant Opex savings this customer realized by utilizing surplus membranes here.


After six months of operation at the ZLD power plant, the mobile water treatment plant successfully reduced the volume of untreatable water by 85% or 3,400,000 gallons. The remaining 600,000 gallons of untreatable water was hauled away for disposal.

Project Savings Summary

Initial disposal quote: $4,000,000
Final disposal cost after onsite treatment: $600,000
Disposal cost savings: $3,400,000
Cost of equipment rental: $250,000
Total hauling and disposal savings: $3,150,000

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