The effluent treatment process neutralises blowdown from wet flue gas scrubbers or from fly ash washing and removes contaminants such as heavy metals, ammonia and persistent organic pollutants (POPs). Depending on the plant configuration, some contaminants such as mercury or zinc can be recovered for recycling. The only remaining components in the cleaned effluent are naturally occurring salts such as sodium and calcium chlorides and sulphates.
Residue Treatment
Effluent treatment
Capture and recycle contaminants
Set the pH
Often lime slurry is used to neutralise acidic scrubber effluents. The first step is to control the pH to transform dissolved heavy metals into less soluble complexes. Induced flocculation enhances the precipitation of fine particulates, gypsum and metal complexes, which allows separation in a sedimentation tank or a filter. Thereafter the pH is adjusted to the neutral range and a second purification is carried out with specific ion exchangers and activated carbon beds. After a final quality control, the clean effluent is discharged. The precipitated sludge is dewatered in a filtration system for final disposal.
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