Table 1

Properties of FGD wastewater before and after various pretreatments

 TDS (g/L)Ca2+ (ppm)Mg2+ (ppm)Na+ (ppm)pHElectrical conductivity (mS/cm)
First tranche – before pretreatment 18.1 370 404 9,648 7.88 36.1 
After Na2CO3.H2O pretreatment 17.6 91 220 9,560  35.2 
Second tranche – before pretreatment 16.9 384.4 289.4 7,273 6.7 33.6 
Second tranche – after pretreatment with Na2CO3.H2O and acidification 12.46 83.83 174.70 6,421 7.88 25.08 
Second tranche – after pretreatment with Na2CO3.H2O, NaOH and acidification + antiscalant 19 46.44 68.12 6,890 7.15 38.1 
 TDS (g/L)Ca2+ (ppm)Mg2+ (ppm)Na+ (ppm)pHElectrical conductivity (mS/cm)
First tranche – before pretreatment 18.1 370 404 9,648 7.88 36.1 
After Na2CO3.H2O pretreatment 17.6 91 220 9,560  35.2 
Second tranche – before pretreatment 16.9 384.4 289.4 7,273 6.7 33.6 
Second tranche – after pretreatment with Na2CO3.H2O and acidification 12.46 83.83 174.70 6,421 7.88 25.08 
Second tranche – after pretreatment with Na2CO3.H2O, NaOH and acidification + antiscalant 19 46.44 68.12 6,890 7.15 38.1 
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