17β-Estradiol removal routes by moving bed biofilm reactors (MBBRs) under various C/N ratios
17β-Estradiol removal routes by moving bed biofilm reactors (MBBRs) under various C/N ratios
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不同 C/N 比下移动床生物膜反应器 (MBBR) 的 17β-雌二醇去除路线
DOI：
10.1016/j.scitotenv.2020.140381
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发表时间：
2020
影响因子：
9.8
通讯作者：
Dezhao Liu
中科院分区：
文献类型：
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作者：
Changwei Li;Zhefeng Gu;Songming Zhu;Dezhao Liu
本研究评价了生物和非生物途径对移动床生物膜反应器（MBBR）去除17β-雌二醇（E2）的贡献，揭示了E2去除途径与生物膜特性之间的相关性。以连续模式操作具有不同C/N比（C/N 0为0; C/N2为2; C/N5为5）的三个MBBR。65天的降解表明，无论C/N如何，MBBR都有很高的去除E2的潜力（所有MBBR的E2去除率均大于99%; P > 0.05）。进一步的批式试验表明，所有MBBR对E2的去除主要来自异养活动，约占85%（P > 0.05），其次是硝化作用（10-11%）和吸附作用（4-5%）。重要的是，较低的粘附力可能导致较高的E2吸附到生物膜上。此外，提高氨氧化速率（AOR）是一致的硝化作用的E2衰减的高贡献。重要的是，异养活性与其对E2去除的贡献呈正相关（r = 0.99，P < 0.05）。综上所述，本研究的结果有助于了解硝化生物膜系统中E2的去除途径。
This study evaluated the contribution of biotic and abiotic routes to the 17β-estradiol (E2) removal in moving bed biofilm reactors (MBBRs), and uncovered the interrelation between the E2 removal routes and biofilm characteristics, which was not researched in previous literature. Three MBBRs with different C/N ratios (0 for C/N0; 2 for C/N2; and 5 for C/N5) were operated in continuous mode. A 65-day degradation demonstrated that the MBBRs had high potential to remove E2 regardless of the C/N (E2 removal greater than 99% for all MBBRs; P > 0.05). Further batch tests showed that the E2 removal mainly resulted from heterotrophic activities for all MBBRs, accounting for approximately 85% for all MBBRs (P > 0.05), followed by nitrification (10–11%) and adsorption (4–5%). Importantly, lower adhesive force likely led to higher E2 adsorption onto biofilms. Besides, enhanced ammonia oxidizing rate (AOR) was consistent with the high contribution of nitrification to the E2 attenuation. Importantly, heterotrophic activity was positively correlated with its contribution to E2 removal (r = 0.99, P < 0.05). To sum, the results obtained in this study helped to understand the E2 removal routes in nitrifying biofilm systems.