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The samples of real FGD wastewater were collected from a coal-fired power plant located in Zhanjiang city, China. Some physicochemical characteristics of raw wastewater used in this experiments are listed in Table 1. All chemicals used in the experiments were analytical grade and purchased from Sigma. The graphite, iron (≥99.9%) and aluminum (≥99.9%) plates were arranged from Shenzhen Quanfu Metal Co. Ltd, China.

Table 1

Physicochemical characteristics of FGD wastewater before and after EC treatment

ParameterRaw waterEffluentAverage removal efficiency (%)
Conductivity (μS/cm) 20,723–21,309 18,630–19,055 8–10 
pH 5.6–6.2 6.7–7.3  
Mercury (mg/L) 0.25–0.43 ≤0.03 90 
Manganese (mg/L) 2.73–3.45 ≤0.4 89 
Nickel (mg/L) 3.16–3.37 ≤0.1 98 
Lead (mg/L) 0.41–0.80 ≤0.08 92 
Cadmium (mg/L) 1.38–1.54 ≤0.2 88 
Copper (mg/L) 1.65–1.93 ≤0.1 98 
Sulfate (mg/L) 4,325–5,720 3,269–4,580 20–24 
Chloride (mg/L) 6,400–8,432 4,012–6,974 18–32 
Fluoride (mg/L) 39.7–52.2 ≤7.3 86 
SS (mg/L) 15,232–18,930 ≤3.0 99.9 
COD (mg/L) 575–827 ≤ 95 89 
ParameterRaw waterEffluentAverage removal efficiency (%)
Conductivity (μS/cm) 20,723–21,309 18,630–19,055 8–10 
pH 5.6–6.2 6.7–7.3  
Mercury (mg/L) 0.25–0.43 ≤0.03 90 
Manganese (mg/L) 2.73–3.45 ≤0.4 89 
Nickel (mg/L) 3.16–3.37 ≤0.1 98 
Lead (mg/L) 0.41–0.80 ≤0.08 92 
Cadmium (mg/L) 1.38–1.54 ≤0.2 88 
Copper (mg/L) 1.65–1.93 ≤0.1 98 
Sulfate (mg/L) 4,325–5,720 3,269–4,580 20–24 
Chloride (mg/L) 6,400–8,432 4,012–6,974 18–32 
Fluoride (mg/L) 39.7–52.2 ≤7.3 86 
SS (mg/L) 15,232–18,930 ≤3.0 99.9 
COD (mg/L) 575–827 ≤ 95 89 

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