雌情活力最强的炔雌醇(EE2)难于生物降解,且具有较强的憎水性,可通过吸附将其从水中去除。为研究羊毛纤维这一新型填料对EE2的吸附特性,比较了活性炭、二氧化锰和羊毛纤维3种吸附剂对EE2的吸附去除作用。含炔雌醇5.0μg/L的溶液经分别填充有活性炭、二氧化锰和羊毛纤维的上向流反应器,活性炭反应器的去除率为99.8%,而且实验期间没有穿透饱和;二氧化锰反应器8d后开始穿透。虽然羊毛纤维的吸附能力强于二氧化锰,但因羊毛纤维的容积密度远远小于二氧化锰,所以在实验后12h开始穿透逐渐饱和。由于实际中EE2浓度远远小于实验浓度,所以采用羊毛纤维作为反应器的吸附剂不存在短时间达到饱和问题,这也在后续的中试实验中得到了验证。
17α-ethynylestradiol(EE2) is the strongest estrogenic endocrine disrupting chemical,and it is hardly biodegradable.It can be removed by adsorption due to its hydrophobic property.The absorptive removal of EE2 is comparatively studied by pumping EE2 solution(5.0 μg/L) into upstream reactors,packed with granular activated carbon(GAC),manganese oxide(MnO2) and wool fiber respectively.The GAC reactor removes 99.8% EE2 without breakthrough,and the breakthrough in the MnO2 reactor happens after 8 days.Although the absorbability of wool fiber is higher than MnO2,the breakthrough in the wool fiber reactor happens after 12 hours.This lies in that the bulk density of wool fiber(10~20 kg/m3) is lower than that of MnO2(1 900~2 000 kg/m3).A practically used wool fiber reactor may take more time to breakthrough due to the approximately three orders of magnitude lower EE2 concentration in the secondary effluent than that in these experiments,which is proved by the following pilot-scale experiments.