Abstract: With the deterioration of groundwater arsenic pollution problem，arsenic pollution has become an issue of common concern in the world.To seek for the economic and reasonable arsenic removal technology，Fenton reagent oxidation-flocculation method is used for As (Ⅲ) removal test.Initial wastewater As (Ⅲ) concentration is 0.5 mg/L，optimum arsenic removal condition ensured in experiment is regulating wastewater initial pH=3.0，H₂O₂ dosage of 10 mg/L，mole ratio of Fe2+ to H₂O₂ is 0.2，reaction time is 10 min，As (Ⅲ) removal rate was 95.17%.Adopt the best conditions for a actual arsenic bearing wastewater from Ganzhou removal test showed that the As (Ⅲ)) removal rate can reach 94.71%，As(Ⅲ) concentration in water is 0.0042 mg/L，below the standard of 0.01 mg/L in drinking water health standards (GB5749-2006).Fenton oxidation-flocculation arsenic removal is a method using intermediate (including H₂O₂，·OH，O₂·，·HO₂，etc.) produced in Fenton reaction to flocculation combined As (Ⅲ) and iron salt.

Key words: Fenton reagent, Oxidation, As(Ⅲ) , Flocculation