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.