Removal of High-Concentration Sulfate Ions from the Sodium Alkali FGD Wastewater Using Ettringite Precipitation Method: Factor Assessment, Feasibility, and Prospect

Table 2

Results of heavy metal ions removal.

	Cr^2+	Mg^2+	Mn^2+	Ni^2+	Pb^2+	Zn^2+
Actual wastewater, mg/L	3.55	15.48	22.76	5.53	5.15	5.29
Purified wastewater, mg/L	—	0.0102	0.0019	—	—	—
Average removal efficiency, %	100	99.93	99.99	100	100	100