College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University, Ministry of Education, Changsha 410082, PR China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University, Ministry of Education, Changsha 410082, PR China.
Sci Total Environ. 2021 Jul 20;779:146195. doi: 10.1016/j.scitotenv.2021.146195. Epub 2021 Mar 3.
Tonalide (AHTN), a typical polycyclic musk and an emerging pollutant, was found to be enriched in waste activated sludge (WAS). However, the research of its effect on WAS anaerobic digestion was seldom available. This research therefore investigated the effect of AHTN on WAS anaerobic digestion and the underlying mechanism through batch experiments using either real WAS or synthetic wastewaters as the digestion substrates. The results indicated that when the concentration of AHTN increased from 0 to 1000 mg/kg TSS in WAS, the methane production increased linearly from 125.0 ± 2.2 to 162.9 ± 1.6 mL/g VSS, while the AHTN concentration further increased to 2000 mg/kg TSS, the methane production decreased to 146.2 ± 2.1 mL/g VSS. At the same time AHTN can facilitate the utility of volatile fatty acid (VFAs), especially acetate and propionate. It was further found that the degradation efficiency of AHTN in anaerobic digestion was 42.7%. The mechanism investigation demonstrated that AHTN can promote the solubilization, homoacetogenesis, acetogenesis and methanogenesis processes, leading to an increase in methane production. Further analysis revealed that methanogenic archaea mainly belonged to the genera of Methanosaeta and Metheanobacterium, and their relative abundance increased accordingly with the addition of AHTN.
-tonalide (AHTN)，一种典型的多环麝香类化合物和新兴污染物，在废活性污泥 (WAS) 中被发现有富集。然而，关于其对 WAS 厌氧消化影响的研究却很少。因此，本研究通过使用真实的 WAS 或合成废水作为消化底物的批式实验，研究了 AHTN 对 WAS 厌氧消化的影响及其潜在机制。结果表明，当 AHTN 的浓度从 0 增加到 WAS 中的 1000 mg/kg TSS 时，甲烷产量从 125.0±2.2 线性增加到 162.9±1.6 mL/g VSS，而当 AHTN 浓度进一步增加到 2000 mg/kg TSS 时，甲烷产量下降到 146.2±2.1 mL/g VSS。同时，AHTN 可以促进挥发性脂肪酸（VFAs）的利用，特别是乙酸盐和丙酸盐。进一步研究发现，AHTN 在厌氧消化中的降解效率为 42.7%。机理研究表明，AHTN 可以促进污泥的溶解、同型产乙酸、乙酸生成和甲烷生成过程，从而增加甲烷产量。进一步分析表明，产甲烷古菌主要属于 Methanosaeta 和 Methanobacterium 属，随着 AHTN 的添加，它们的相对丰度相应增加。
