高铁酸钾强化聚合氯化铝去除水中四环素

Removal of Tetracycline from Water by Polyaluminum Chloride Coupled with Potassium Ferrate

作为一种典型的抗生素类物质,四环素在水环境中存在潜在的安全风险。本文利用高铁酸钾强化聚合氯化铝混凝去除水中四环素,研究了水体pH对四环素去除效能的影响,同时探究了钙离子、硅酸盐、磷酸盐和腐殖酸等常见共存离子对去除过程的影响。结果表明:(1)投加量为10mg/L高铁酸钾和20mg/L聚合氯化铝的组合为优选配比;(2)高铁酸钾强化混凝去除四环素的最佳pH为7,且在酸性条件下四环素的去除率更优;(3)在本研究中,钙离子、磷酸根和腐殖酸的存在会影响四环素在pH5~9下的去除率,硅酸根会影响中性和碱性条件下四环素的去除率;(4)高铁酸钾强化聚合氯化铝去除水中四环素机制为氧化作用耦合混凝沉淀作用。

As a typical antibiotic,tetracycline has potential safety risks in water environment.In this paper,the technique of polyaluminum chloride coupled with potassium ferrate was used to remove TC contaminants from water.The effect of solution pH on the removal efficiency of was studied.Meanwhile,the effects of coexisting ions(such as calcium,silicate and phosphate)and humic acid on the removal process were also explored.Results showed that(1)the optimal dosage was 10 mg/L potassium ferrate and 20 mg/L polyaluminum chloride.(2)The optimal solution pH for tetracycline removal was 7 and the removal rate of tetracycline was better under acidic condition.(3)In this study,the presence of calcium,phosphate and HA could affect the removal of TC at pH 5~9,and the presence of silicate could affect the removal of tetracycline under neutral and alkaline conditions.(4)The removal mechanism of tetracycline by PAC coupled with potassium ferrate was the combination of oxidation with coagulation.