CrossTek Membrane Technology LLC

Membrane-Based Technology for Flue Gas Desulfurization (FGD) - Air and Climate

FGD is Key to Coal-Fired Power Generation: Wet Flue Gas Desulfurization (FGD) is a process by which coal-fired power plants remove sulphur dioxide (SO2) before emitting their flue gas into the atmosphere. The water intensive scrubbing process requires a durable treatment technology as FGD blowdown wastewaters are highly contaminanted.

Highly Contaminated Wastewater

FGD scrubber liquor has very high levels of chlorides (4,000 – 25,000 mg/L), trace concentrations of heavy metals (e.g., chromium, mercury, and selenium), high levels of nitrates (10-700 mg/L) and very high levels of total dissolved solids (15,000 to 60,000 mg/L).

Difficult Composition

Effluent is particularly contaminated with suspended solids, chlorides, and organics

Effects on Process

Treatment of complex, high TDS wastewater will result in more processes and require more durable materials of construction.

Multiple Unit Operations

Conventional processes, like coagulation/flocculation, softening and ultrafiltration are used as pre-treatment to the RO in order to achieve Zero Liquid Discharge.  

AquaZoom RO Enhances Process

Our AquaZoom™ ST+ or DTG modules can be used to desalinate the wastewater and cost effectively reduce the volume prior to evaporation. A typical FGD water treatment process is illustrated to the right.

AquaZoom RO Modules for Large Flows

As a large membrane area solution for high-volume applications, the ST+ and ST++ modules can be used to significantly reduce treatment plant footprint and overall CAPEX.