Department of Environmental Science and Engineering, Fudan University, Shanghai, 200438, China.
Department of Environmental Science and Engineering, Fudan University, Shanghai, 200438, China.
Chemosphere. 2022 Sep;303(Pt 3):135100. doi: 10.1016/j.chemosphere.2022.135100. Epub 2022 May 26.
Antibiotics had attracted more and more attention in recent years due to their harmfulness. Fluoroquinolones (FQs), one class of antibiotics widely used in human and veterinary medicine, were found in various water bodies in China. Therefore, in order to found an efficient method for removing FQs in rural domestic wastewater and optimize the process parameters, ceramsite and soil were applied in vertical flow constructed wetlands (VFCWs) to study the effects of different hydraulic loads and different substrates on the removal of FQs and conventional pollutants. The results showed the VFCW-D filled with 45 cm soil layer and 15 cm ceramasite layer had the highest removal efficiency of conventional pollutants and FQs under low hydraulic load. Nevertheless, the removal efficiency of conventional pollutants was significantly declined for the VFCWs which contained soil substrates under high hydraulic load due to the soil pores were clogged by the accumulation of organic matter. Finally, VFCW-A filled with 60 cm ceramasite layer revealed good ability to remove conventional pollutants and FQs under high hydraulic load. Deinococcus played a vital role here due to its excellent removal effect on conventional pollutants. The microbial composition in the substrate changed greatly after adding antibiotics under high hydraulic load. Devosia, Pseudorhodoferax, Cellvibrio, Bosea, Caulobacter, Acinetobacter, Zoogloea, Arcobacter, Dechloromonas, Flavobacterium, Nakamurella, Chloroplast, Clostridium_sensu_stricto_1, Pelosinus, UTCFX1 and Hypnocyclicus became the new dominated genera and were essential to remove pollutants. In summary, VFCW was an effective system to remove fluoroquinolones in rural domestic wastewater.
近年来，由于抗生素的危害性，抗生素越来越受到关注。氟喹诺酮类（FQs）是一类广泛应用于人类和兽医医学的抗生素，在中国的各种水体中都有发现。因此，为了找到一种有效去除农村生活污水中 FQs 的方法，并优化工艺参数，采用陶粒和土壤填充垂直流人工湿地（VFCWs），研究不同水力负荷和不同基质对 FQs 和常规污染物去除的影响。结果表明，在低水力负荷下，填充 45cm 土层和 15cm 陶粒层的 VFCW-D 对常规污染物和 FQs 的去除效率最高。然而，在高水力负荷下，含有土壤基质的 VFCWs 由于有机物的积累堵塞了土壤孔隙，常规污染物的去除效率显著下降。最后，在高水力负荷下，填充 60cm 陶粒层的 VFCW-A 对常规污染物和 FQs 具有良好的去除能力。耐辐射球菌因其对常规污染物的优异去除效果在此过程中发挥了重要作用。在高水力负荷下添加抗生素后，基质中的微生物组成发生了很大变化。Devosia、Pseudorhodoferax、Cellvibrio、Bosea、Caulobacter、Acinetobacter、Zoogloea、Arcobacter、Dechloromonas、Flavobacterium、Nakamurella、Chloroplast、Clostridium_sensu_stricto_1、Pelosinus、UTCFX1 和 Hypnocyclicus 成为新的优势属，对污染物的去除至关重要。总之，VFCW 是一种有效去除农村生活污水中 FQs 的系统。
