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

Table 1

Results of anions removal.

	SO4^2−	Cl^−	F^−	NO3^−	pH
Actual wastewater, mg/L	15,274.8	205.56	101.43	58.30	7.8
Purified wastewater, mg/L	172.61	199.71	7.95	54.94	13.1
Average removal efficiency, %	98.87	2.85	92.16	5.76	—