The researchers pretreated chemical pharmaceutical wastewater with high salinity using distillation and microelectrolysis processes. They then used ferric-carbon microelectrolysis and flocculation to further treat the wastewater. The optimized conditions for microelectrolysis were pH=3.0, V(Fe)/V(C)=4∶1, and HRT=6 h, resulting in a COD removal rate of 26.5%. The optimized pH value for flocculation was 9.0, with a COD removal rate of 1.5%. After pretreatment, the COD removal rate reached 28.0%, with COD decreasing to 20,988 mg/L and the BOD5/COD ratio increasing from 0.28 to 0.41. Subsequent anaerobic digestion further reduced COD to 2,100 mg/L with a removal rate of 75.0%. Overall, the pretreatment improved the biodegradability of the wastewater, making it suitable for further treatment.