重污染型河水中典型内分泌干扰物的臭氧氧化去除研究

Direct Removal of Typical Endocrine Disruptors from Heavily Polluted River Water by Ozonation

研究了臭氧直接氧化黑臭河水对于常规污染物和典型内分泌干扰物的去除效果.从南方某条污染严重的黑臭河涌中采集原水,臭氧投加浓度分别为28 mg·L1和42 mg·L-1、对应曝气时间30 min和80 min,考察臭氧氧化对黑臭河水中化学需氧量(COD)、氨氮、色度和浊度,以及正壬基酚(4-n-NP)、叔辛基酚(4-t-OP)、双酚A(BPA)、雌激素酮(E1)、雌二醇(E2)、17α-雌二醇(17α-E2)、雌炔醇(EE2)和雌三醇(E3)等8种典型内分泌干扰物(EDs)的去除效果.臭氧直接氧化可以在5min内使原水色度由30倍降至17倍;浊度分别上升36%和53%,随着臭氧投加时间延长浊度重新降低至原水水平;COD和氨氮的去除率为3%～7%;8种EDs的整体去除率为87%～96%;含量较高的BPA、OP和EE2在前30 min被大部分去除,去除率分别为89%～98%、82%～96%和82%～90%;含量较低的E3浓度呈现出先升高后降低的趋势,并最终得到100%完全去除;臭氧投加对于E1和E2去除率稍低,分别为41%～70%和62%～85%;延长臭氧接触时间并不能有效改善EDs的去除率.

Ozone was applied to study the removal of conventional pollutants and typical endocrine disrupters（EDs）,including bisphenol A（BPA）,4-n-nonylphenol（NP）,4-tert-octylphenol（OP）,estrone（E1）,estradiol（E2）,17α-estradiol（17α-E2）,estriol（E3） and ethinylestradiol（EE2）,from heavily polluted river water.The O3 dose was designed at 28 mg·L-1 for 30 min and 42 mg·L-1 for 80 min.Pollutants in terms of chemical oxygen demand（COD） and ammonia nitrogen can not be removed efficiently,ranged from 3% to 7%.The colority of the black water was quickly reduced in the first 5 minutes,while the turbidities increased first and then decreased gradually.It showed that three EDs with relatively high level including BPA,OP and EE2 could be removed efficiently in thirty minutes.Concentrations of E3 increased first then decreased to be lower than the detection limit.Removal efficiencies of E1 and E2 were 41%-70% and 62%-85% respectively.Extension of ozone exposure time can not improve the efficiency of EDs removal any more.