Carrousel氧化沟工艺去除污水中雌激素中试研究

ON THE REMOVAL OF ESTROGENS IN SEWAGE BY CARROUSEL PILOT SCALE OXIDATION DITCH TREATMENT PROCESS

研究了雌酮(E1)、17β-雌二醇(E2)和17α-乙炔基雌二醇(EE2)在Carrousel 2000型氧化沟中试工艺中的去除率及其主要影响因素。考察的运行参数包括污泥停留时间(SRT)、水力停留时间(HRT)和曝气量。结果表明,该中试工艺对雌激素去除效果较好,雌激素的去除与SRT、HRT和曝气量均呈正相关关系,而与TN去除率呈一定负相关关系。综合考虑常规水质指标的去除率,实验中去除雌激素的最优条件为25 d的SRT、20 h的HRT和2.2 m3/h的曝气体积流量,此时E1、E2和EE2的去除率分别为93.4%、94.7%和78.8%。

The removal rates of oestrone （E1）, β-estradiol （E2） and 17α-ethinyl estradiol （EE2） and their main factors were investigated in the Carrousel 2000 pilot scale oxidation ditch process. The effects of different operation conditions on the removal of estrogens were discussed, including solid retention time （SRT）, hydraulic retention time （HRT） and aeration conditions. Results showed that higher SRT, HRT and aeration conditions could facilitate the removal of estrogens in oxidation ditch process. A negative correlation was observed between the removals of estrogens and that of total nitrogen. The optimized operation condition for the studied oxidation ditch bioreactor were 25 d for SRT, 20 h for HRT and aeration condition being 2.2 m3/h, where the removal rates of El, E2 and EE2 were 93.4%, 94.7% and 78.8%, respectively.