摘要
      再生水中的抗生素抗性基因（ARGs）和溶解出水有机物（dEfOM）是景观再利用或生态水补偿的潜在风险。吸附法在污水深度处理中显示出很高的优势。为了提高吸附剂在应用过程中的回收率，通过在粉末活性炭上负载铁磁性氧化物成功制备了磁性活性炭（MAC），并将其用作超滤（UF）的预处理，以同时降低dEfOM和ARGs。同时，进一步研究了MAC对膜污染的缓解机理。结果表明，MAC-UF混合工艺对dEfOM和ARGs的去除效率优于单独工艺。dEfOM的去除率超过60%，sulI、sulII、sulIII、tetM、tetQ和tetW的最大去除率分别达到3.09、3.77、1.96、4.33、3.85和2.75 log单位。它们的减少主要归因于MAC的表面吸附以及UF的物理保留。基于相关性分析，tetM、tetQ、tetW的减少与黄腐酸、可溶性微生物产物和腐殖酸的减少密切相关（p<0.01）。标准堵塞和滤饼过滤是整个过滤过程中主要的膜污染机制。MAC预处理后，膜污染显著减少，特别是不可逆水力阻力（88.9%）。总之，本研究为降低dEfOM和ARGs提供了一种新的途径，可能对中水安全和UF技术推广具有重要意义。
Abstract
Antibiotic resistance genes (ARGs) and dissolved effluent organic matter (dEfOM) in reclaimed water are potential risks for landscape reuse or ecological water compensation. Adsorption process showed high advantage during advanced wastewater treatment. To improve the recovery of adsorbent during application, magnetic activated carbon (MAC) was successfully prepared by loading ferromagnetic oxide on powder activated carbon and used as pre-treatment for ultrafiltration (UF) to simultaneously reduce dEfOM and ARGs. Meanwhile, the mitigation mechanism of membrane fouling by MAC was further investigated. Results showed that the removal efficiency of dEfOM and ARGs by a hybrid process of MAC-UF was superior to the individual process. dEfOM reduction was more than 60%, and the maximum removal of sulI, sulII, sulIII, tetM, tetQ and tetW reached 3.09, 3.77, 1.96, 4.33, 3.85 and 2.75 log units, respectively. Their reduction was mainly attributed to the surface adsorption of MAC as well as physical retention by UF. Based on correlation analysis, the reduction of tetM, tetQ, tetW were strongly correlated with that of fulvic acids, soluble microbial products and humic acids (p < 0.01). Standard blocking and cake filtration were the dominant membrane fouling mechanisms throughout the filtration process. After MAC pretreatment, membrane fouling was significantly reduced, especially for the irreversible hydraulic resistance (88.9%). In a word, this study provided a new approach for dEfOM and ARGs reduction, and may have important significance for reclaimed water security and UF technology promotion.

https://www.sciencedirect.com/science/article/abs/pii/S1383586622017828