In many geographic locations, wastewater from Flue Gas Desulphurization (FGD) scrubbers can no longer be discharged. Treating FGD wastewater requires the removal of emission contaminants including selenium, mercury, arsenic and nitrate, which can be challenging.
A compliant solution for coal fired power plants is Zero Liquid Discharge (ZLD), a proven process which totally eliminates FGD wastewater discharge through the recovery of clean water for reuse, and converting suspended solids and emission content into dry solids suitable for disposable.
Aquatech has vast, unparalleled experience with FGD wastewater, having designed, installed, and operated a number of proven ZLD systems at coal-fired power plants throughout the world.
FGD scrubber systems create a wastewater stream that is difficult to handle because of its high suspended solids, metals and chlorides content. Due to the high dissolved solids content of this wastewater stream, recycling for reuse internally in the power plant is normally quite challenging. The only options available for the final disposal of this wastewater are discharge under specified limitations or crystallization/solidification in a ZLD system. Zero-liquid discharge (ZLD) is a water treatment process in which all wastewater is completely recycled; therefore, discharging no liquid at the end of the treatment cycle. ZLD is an advanced wastewater treatment method that can include clarification (lime softening), ultrafiltration, reverse osmosis, and evaporation/crystallization.
FGD/ELG Solutions For Coal Power Plants
In 2015, the United States EPA issued both final Coal Combustion Rules (CCR’s) and revised Effluent Limitation Guidelines (ELG’s). Both of these regulations impact the water balance of power plants throughout North America. One of the primary challenges to coal-fired power plants is to meet new discharge requirements for Flue Gas Desulfurization (FGD) purge streams. Aquatech provides proven solutions to coal-fired power plants that are in compliance with ELG’s for wastewater discharge.
FGD/ELG Zero Liquid Discharge Advantages
- Five-year extension for compliance
- No future concerns on NPDES permitting
- Cost competitive to Phys/Chem + Bio
- Reuse of wastewater from plant discharge
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