猪场废水抗生素类新型污染物控制关键技术研究成果

Research Achievement of Key Technologies of Emerging Contaminants Treatment for Antibiotics in Piggery Wastewater

针对畜禽废水还田利用潜在的抗生素残留风险,以高有机负荷低浓度抗生素含量的废水中抗生素高效选择性去除为目标,以资源化利用畜禽养殖废水中营养物质为导向,研发了猪场废水抗生素类新型污染物控制关键技术。结果表明,通过在废水常规处理工艺基础上增加好氧生物处理单元,并投加硝化抑制剂或控制好氧污泥的泥龄抑制氨氮硝化,可去除90%以上抗生素类新型污染物,并能够有效抑制氨氮的硝化作用。为应对冬季低温环境下好氧生物处理对抗生素降解效果差,以及生猪疫病暴发期间兽药用量大而导致残留抗生素浓度偏高的问题,开发了O3氧化、柠檬酸助类Fenton氧化和UV/H2O2高级氧化等二级生化出水深度处理技术,保障了猪场废水抗生素类新型污染物的降解效果。

To reduce the risk of antibiotic residues in piggery wastewater when returned to farmland as fertilizer and to increase nutrient utilization rates of livestock wastes,this study aims to selectively reduce antibiotics contents in wastewater with high organic loads and low antibiotic concentrations.Here,a series of techniques to control antibiotic contents in piggery wastewater was developed.Results indicated that by integrating an aerobic biological treatment unit with current anaerobic-based treatment system,adding nitrification inhibitor or monitoring sludge retention time(SRT),our improved system was able to remove 90%of emerging contaminants of antibiotics and effectively inhibit the nitrification of ammonia nitrogen.Additionally,coping with the issues of poor degradation efficiency of antibiotics in aerobic biological process during winter time,or the high residual antibiotic concentrations caused by increased uses of drugs during infection outbreaks,a series of advanced treatment processes of secondary effluent,including O3 oxidation,citric acid assisted Fenton oxidation and UV/H2O2 advanced oxidation,was furtherly developed.This series of techniques together secure a satisfactory removal efficiency of emerging contaminants of antibiotics in our improved piggery wastewater treatment system.