Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Hohai University, Nanjing, 210098, China.
College of Environment, Hohai University, Nanjing, 210098, China.
Environ Sci Pollut Res Int. 2017 Nov;24(31):24261-24271. doi: 10.1007/s11356-017-0022-2. Epub 2017 Sep 9.
Considering the increasing incorporation of manufactured nano-material into consumer products, there is a concern about its potential impacts in biological wastewater treatment. In this study, the response of anaerobic sludge to the presence of BiWO nano-particles (NPs) was investigated in the anaerobic membrane bioreactor (AnMBR). As the concentration of BiWO in the reactor was controlled around 1 mg/L, there was no significant difference in effluent water quality or bacterial activities before and after NP exposure, partially due to the microbial-induced NP aggregation and stable complex formation. However, with the increasing dosage of BiWO from 5 to 40 mg/L, great influences on the AnMBR performance were observed, including the reduction of COD removal efficiency, inhibition of the mechanization step, increased production of soluble microbial products, and enhanced secretion of extracellular polymer substrates. Additional investigation with high-throughput sequencing was conducted, clearly demonstrating that BiWO NPs induced changes in the bacterial community.
考虑到越来越多的人造纳米材料被纳入消费产品，人们担心其对生物废水处理的潜在影响。在这项研究中，考察了厌氧污泥对存在的 BiWO 纳米颗粒（NPs）的反应在厌氧膜生物反应器（AnMBR）中。由于反应器中 BiWO 的浓度控制在 1mg/L 左右，因此在 NP 暴露前后，出水水质或细菌活性没有明显差异，部分原因是微生物诱导的 NP 聚集和稳定的复合物形成。然而，随着 BiWO 剂量从 5mg/L 增加到 40mg/L，对 AnMBR 的性能产生了重大影响，包括 COD 去除效率降低、机械化步骤受阻、可溶性微生物产物增加以及细胞外聚合物基质的分泌增强。通过高通量测序进行了进一步的调查，清楚地表明 BiWO NPs 诱导了细菌群落的变化。
