A/O-MBR中硝化活性污泥的富集及其对氧氟沙星的降解作用

采用A/O-MBR系统,逐步提高进水氨氮浓度富集了硝化活性污泥(NAS),在此基础上,考察了COD、烯丙基硫脲(ATU)、氨氮初始浓度及氨氧化速率对NAS降解氧氟沙星(OFL)的影响。结果表明:富集的NAS的氨氧化速率达到了20 mg/(g SS·h)以上,对OFL具有明显降解作用;ATU存在条件下,COD对OFL的去除作用没有影响;提高初始氨氮浓度和NAS氨氧化速率均可以提高OFL降解量;初始氨氮浓度由50 mg/提升至150 mg/L时,OFL降解量由67.26 μg/g提高到82.11 μg/g;氨氧化速率由小于2.5 mg/(g SS·h)提升至大于20 mg/(g SS·h)时,OFL降解量由30.71 μg/g提高到75.16 μg/g。

Enrichment and ofloxacin degradation characteristics of nitrifying activated sludge in an A/O-MBR process

Enrichment of nitrifying activated sludge (NAS) was achieved by gradually increasing the influent ammonia concentration in an A/O-MBR system. On this basis, the effects of COD, initial ammonia concentration, and ammonia oxidation rate on the degradation of OFL by NAS were investigated. The results showed that the ammonia oxidation rate of the enriched NAS could reach 20 mg/(g SS·h), and that the NAS showed significant degradation of OFL. There was no obvious effect of COD on the removal of OFL when allylthiourea (ATU) was added. Increasing both the initial ammonia concentration and the ammonia oxidation rate of NAS could increase the amount of OFL degraded. The amount of OFL degraded, ranged from 67.26 to 82.11 μg/g when there was an increase in the initial ammonia concentration from 50 to 150 mg/L. The degraded OFL ranged from 30.71 to 75.16 μg/g with increase in the ammonia oxidation rate from 20 mg/(g SS·h).