Fenton法对沼液中三种四环素类和三种磺胺类抗生素氧化去除的研究

近年来各类抗生素广泛地用于畜禽养殖,经动物代谢后随粪便和尿液排出体外。代谢物通过沼气工程处理后,得到的沼液又多用于灌溉,使得抗生素进入环境被农作物吸收,通过食物链的传递对人体产生危害。因而沼液中抗生素的去除尤为重要。采用Fenton氧化技术去除沼液中的三种四环素类和三种磺胺类抗生素,通过设置单因素实验考察了pH值、H_2O_2浓度、摩尔比n(H_2O_2)/n(Fe~(2+))对抗生素去除的影响。结果表明,最佳反应条件为pH=4,H_2O_2浓度为0.4 mol·L~(-1),n(H_2O_2)/n(Fe~(2+))=10∶1,在此条件下,四环素、土霉素、金霉素去除率分别为91.83%、92.38%、80.52%,磺胺甲恶唑、磺胺甲基嘧啶、磺胺嘧啶去除率分别为93.60%、91.97%、91.60%。同时TN、TP、TK的保留率分别为96.0%、97.7%、97.2%。可见,Fenton氧化法对沼液中抗生素的去除有良好的效果,同时又保证其养分的保留,为沼液中抗生素的去除提供了一条可能的途径。

Removal of three kinds of tetracycline antibiotics and three kinds of sulfa antibiotics in biogas slurry by Fenton oxidation

In China, different kinds of antibiotics have been widely used in poultry production. In most cases, animal wastes are treated using biogas plants, and then the biogas slurry is used for irrigation. Consequently, antibiotics may be discharged into the environment and be absorbed by crops, which is dangerous to organisms and human beings through food chain transmission. Therefore, antibiotics should be removed to ensure the safe use of biogas slurry. In this study, fenton oxidation was employed to remove three kinds of tetracycline antibiotics and three kinds of sulfa antibiotics in biogas slurry, in which the effects of pH, H₂O₂ dosage, and mole ratio of n (H₂O₂)/n (Fe²⁺)on the removal rates were investigated. The results showed that the optimal reaction condition was pH 4.0, 0.4 mol·L^-1 H₂O₂, and 10:1 of n (H₂O₂)/n (Fe²⁺). Under this condition, the removal rate of tetracycline, oxytetracycline, chlorotetracycline, sulfamethoxazole, sulfamerazine, and sulfadiazine was 91.83%, 92.38%, 80.52%, 93.60%, 91.97%, and 91.60%; The retention rate of nutrients TN, TP, and TK was 96.0%, 97.7%, and 97.2%, respectively. In summary, Fenton oxidation offers an effective way to remove antibiotics in biogas slurry.