Answers to common questions about flue gas desulfurisation (FGD) wastewater treatment, high-salinity streams, heavy metal removal, sludge handling and environmental compliance in power generation facilities.
FGD wastewater treatment removes contaminants from wastewater generated by flue gas desulfurisation systems used in coal-fired power stations. These systems capture sulphur dioxide emissions, producing wastewater streams that require treatment before discharge or reuse.
FGD wastewater is difficult to treat because it typically contains high concentrations of dissolved salts, chlorides, heavy metals, suspended solids and chemical residues. The combination of high salinity and complex contaminants requires specialised treatment processes.
FGD wastewater may contain heavy metals such as mercury, selenium and arsenic, along with chlorides, sulphates, suspended solids, gypsum particles and chemical treatment residues. The exact composition depends on fuel type, plant operation and FGD system design.
FGD wastewater treatment may include chemical precipitation, pH adjustment, clarification, filtration, sludge dewatering, chemical dosing and advanced treatment processes. In some cases, additional steps such as evaporation or zero liquid discharge systems are used to manage high-salinity streams.
Proper treatment ensures that wastewater discharged from power plants meets environmental standards and does not contaminate surrounding waterways or groundwater. It also helps maintain regulatory compliance and supports the long-term operation of emission control systems.
In some facilities, treated FGD wastewater may be reused within plant processes such as cooling systems or ash handling, depending on water quality requirements. Reuse can reduce freshwater consumption and overall discharge volumes.
Common challenges include high salinity, scaling, corrosion, complex metal removal, sludge management, variable influent quality and meeting strict discharge limits. These factors often require robust, multi-stage treatment systems.
Zero liquid discharge (ZLD) is a treatment approach where all wastewater is treated and recovered, leaving no liquid waste discharge. In FGD systems, this may involve evaporation and crystallisation processes to manage high-salinity wastewater streams.
Yes. FGD wastewater treatment systems are typically customised based on plant design, wastewater composition, regulatory requirements, flow rates and site-specific constraints. Tailored systems are essential due to the complexity of FGD wastewater.
Yes. Tasman Water Technologies provides industrial water and wastewater treatment solutions for power generation facilities, including FGD wastewater treatment, chemical treatment, filtration, sludge handling, system design and ongoing technical support.
