颗粒活性炭修复了污泥厌氧消化中聚苯乙烯纳米塑料诱导的抗生素抗性传播和产甲烷抑制。
Granular activated carbon remediates antibiotic resistance propagation and methanogenic inhibition induced by polystyrene nanoplastics in sludge anaerobic digestion.
作者信息
Mohammad Mirsoleimani Azizi Seyed, Zakaria Basem S, Haffiez Nervana, Ranjan Dhar Bipro
机构信息
Civil and Environmental Engineering, University of Alberta, 116 Street NW, Edmonton, AB T6G 1H9, Canada.
Civil and Environmental Engineering, University of Alberta, 116 Street NW, Edmonton, AB T6G 1H9, Canada.
出版信息
Bioresour Technol. 2023 Jun;377:128938. doi: 10.1016/j.biortech.2023.128938. Epub 2023 Mar 21.
Nano/microplastics (NPs/MPs) in sewage sludge can induce oxidative stress to the anaerobic digestion (AD) and also proliferate antibiotic resistance genes (ARGs). Recently, granular activated carbon (GAC) has been used as an additive to enhance methane production in AD via direct interspecies electron transfer (DIET); however, its impact on AD exposed to NPs/MPs is yet to be studied. This study examined the effect of GAC (5 and 15 g/L) on sludge AD exposed to 150 µg/L of polystyrene nanoplastics (PsNPs). PsNPs decreased methane yield by 32.3% due to elevated levels of reactive oxygen species. However, GAC addition counteracted this adverse effect and improved methane production, attributed to the potential enrichment of DIET-active microbes and the adsorption of PsNPs by GAC. Moreover, GAC reduced the total abundance of ARGs, which was increased by PsNPs exposure. Thus, GAC can provide dual benefits in mitigating methanogenic inhibition caused by PsNPs and ARG spread.
污水污泥中的纳米/微塑料（NPs/MPs）会对厌氧消化（AD）产生氧化应激，还会使抗生素抗性基因（ARGs）增殖。最近，颗粒活性炭（GAC）已被用作添加剂，通过直接种间电子转移（DIET）来提高AD中的甲烷产量；然而，其对暴露于NPs/MPs的AD的影响尚未得到研究。本研究考察了GAC（5和15 g/L）对暴露于150 μg/L聚苯乙烯纳米塑料（PsNPs）的污泥AD的影响。由于活性氧水平升高，PsNPs使甲烷产量降低了32.3%。然而，添加GAC抵消了这种不利影响并提高了甲烷产量，这归因于DIET活性微生物的潜在富集以及GAC对PsNPs的吸附。此外，GAC降低了ARGs的总丰度，而PsNPs暴露会使其增加。因此，GAC在减轻由PsNPs引起的产甲烷抑制和ARGs传播方面可带来双重益处。
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