A2O活性污泥工艺去除污水中雌激素的试验

Lab Scale Study on Removal of Estrogen from Sewage by A2O Activated Sludge Process

摘要:

试验研究了厌氧—缺氧—好氧(A2O)活性污泥工艺对雌二醇(E2)和乙炔雌二醇(EE2)的去除性能.基于同时去除雌激素和脱氮除磷的考虑,对A2O工艺的部分运行参数如水力停留时间、污泥龄和混合液回流比进行优化.试验结果表明,A2O工艺对污水中雌激素有较强的去除能力.在温度为20 ℃、污泥回流比为100%的情况下,除磷脱氮和去除雌激素最佳的工艺运行参数为:水力停留时间8 h,污泥龄20 d,混合液回流比300%.此时,总氮,PO3-4-P,COD的去除率分别达到81%,95%,84%;E2降到检测限以下,厌氧、

Abstract:

Lab scale experiments were conducted to investigate the degradation potential of 17β estradiol (E2) and 17α ethinyl estradiol (EE2) by anaerobic anoxic oxic (A2O) activated sludge process.Based on the removal of nutrients and estrogen,the operational parameters such as hydraulic retention time (HRT),sludge retention time (SRT) and the recycle ratio of mixed liquor (r) were optimized.The results indicate that estrogens are dramatically removed by the A2O process.At the fixed temperature of 20℃ and sludge recycle ratio of 100%,the optimum operational parameters for HRT,SRT and r are 8 h,20 d and 300%,respectively.Under the above optimum conditions,the removal efficiencies of TN,PO3-4-P and COD are 82%,95% and 84%,respectively.E2 in the final effluent is below the detection limit; of the totally removed E2,72%,6% and 22% are removed in the anaerobic,anoxic and oxic tanks,respectively.EE2 removal efficiency is more than 80%; the anaerobic,anoxic and aerobic tanks contribute 45%,21% and 34% of the totally removed EE2,respectively.