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本文采用两种混凝剂—氯化铁和硫酸铝对两种水质中两种价态的砷进行了除砷试验。结果表明:1.氯化铁去除很软水和硬水中0.34±0.01mg/L As~(5+)的适宜剂量分别为10和20mg/L左右;硫酸铝分别为40和60mg/L左右;2.氯化铁去除两种水质中0.33±0.01mg/L As~(3+)的适宜剂量分别为20和65mg/L左右;硫酸铝除As~(3+)的效率极低;3.As~(3+)用2.5mg/L的氯氧化后,其去除率与As~(5+)相似;4.两种混凝剂的除砷吸咐容量与砷平衡浓度的关系非常符合弗兰德利希吸咐等温式,说明其除砷机理是以吸咐沉淀为主。
In this paper, two kinds of coagulants, ferric chloride and aluminum sulfate, were used for the arsenic removal test of two valence arsenic in the two kinds of water quality. The results showed as follows: 1. The appropriate dosages of 0.34 ± 0.01 mg / L As ~ (5+) for iron chloride removal in soft and hard water were about 10 mg / L and about 20 mg / L respectively; aluminum sulfate was about 40 mg / L and 60 mg / L respectively; The appropriate dosages of ferric chloride to remove 0.33 ± 0.01 mg / L As ~ (3 +) were 20 and 65 mg / L, respectively; the efficiency of aluminum sulfate except As ~ (3 +) was extremely low; ~ (3+) with 2.5mg / L of chlorine oxidation, the removal rate and As ~ (5+) similar; 4. The two coagulants in addition to arsenic adsorption capacity and the equilibrium concentration of arsenic in line with the very Fran Derlich isotherm wasotherm, indicating that the mechanism of arsenic removal is based on the adsorption of precipitation.