HRT对A2O工艺中典型多环麝香迁移转化的影响

研究了不同水力停留时间(hydraulic retention time,HRT)条件下佳乐麝香(galaxolide,HHCB)与吐纳麝香(tonalide,AHTN)在A2O工艺各池水相和泥相中的变化情况.采用固相萃取与气相质谱联用的方法对水相与泥相中目标物的质量浓度进行检测.结果表明,HRT主要影响HHCB在A2O工艺中的生物降解和随剩余污泥排放的比重,影响AHTN随剩余污泥排放的比重.随着HRT的增大,HHCB、AHTN在厌氧池中的去除率与去除贡献率逐渐减小,而缺氧池与好氧池的去除率与去除贡献率相对增大.2种目标物在4个HRT工况(6、8、10、12 h)下的总去除率分别为73.93%、73.05%、75.14%、76.00%和48.76%、44.27%、57.17%、62.9%.A2O工艺对HHCB的去除效果较好,而对AHTN的去除效果较差.HRT的增大对HHCB的去除影响不大,而对AHTN的去除有促进作用.

Effects of HRT on Fate of Typical Polycyclic Musk by A2O Process

Fate of galaxolide (HHCB) and tonalide (AHTN) during the A²O process was investigated under different hydraulic retention time (HRT). Solid phase extraction (SPE) and gas chromatography mass spectrometry (GC/MS) were applied to determine the concentrations of the targets in the aqueous phase and sewage sludge. The results showed that HRT has an influence on the proportions of biodegradation and the discharge of excess sludge for HHCB by the A²O process, and it also affected the discharge of excess sludge for AHTN. With the extension of HRT, removal rates and removal contribution rates of HHCB and AHTN decreased in the anaerobic tank, while increased in the anoxic tank and aerobic tank. The final removal rates of the targets in the four operating conditions (6 h, 8 h, 10 h and 12 h) were 73.93%, 73.05%, 75.14%, 76% and 48.76%, 44.27%, 57.17%, 62.9%, respectively. The removal efficiency was good for HHCB, but the removal efficiency of AHTN was poor by the A²O process. Meanwhile, with the extension of HRT, the removal efficiency showed no significant effect on HHCB, but it promoted the removal efficiency of AHTN.