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<p>The effects of titanium dioxide (TiO<sub>2</sub>) nanoparticles with different diameters (40&#xa0;nm and 70.31 ± 10.07&#xa0;nm) on the anaerobic co-digestion of hybrid <i>Pennisetum</i> and sludge were investigated through a 36-day fermentation experiment. The results showed that biogas production in a wet AD process improved when the diameter of the TiO<sub>2</sub> nanoparticles increased. Digesting using TiO<sub>2</sub> nanoparticles with a diameter of (70.31 ± 10.07) nm (T2 system) demonstrated a 162.6% higher biogas production compared to digestion with the 40&#xa0;nm TiO<sub>2</sub> nanoparticle system. Moreover, the impact of the TiO<sub>2</sub> concentration on anaerobic digestion (AD) was also investigated. The T2 system biogas production was increased by 76.95%, 49.80%, 45.45%, and 5.88% in a wet AD process. Moreover, although the addition of T<sub>2</sub> did not shorten the lag phase of the process, it significantly affected the microbial community of the AD system. 16S RNA amplicon sequencing data demonstrated that hydrogenotrophic methanogens, such as <i>Methanobacterium</i> sp. and <i>Methanobrevibacter</i> sp., played a key role in methane production of the system. The addition of T<sub>2</sub> increased the microbial community diversity and richness.</p>

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Effect of TiO2 nanoparticles on anaerobic co-digestion of hybrid Pennisetum and sludge

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Shaomei Wang,
  • Li Li,
  • Congqi Zhao,
  • Siwen Xiong,
  • Mengjie Zhong,
  • Ce Li,
  • Xiangdong Qin,
  • Hongmei Zhao

摘要

The effects of titanium dioxide (TiO2) nanoparticles with different diameters (40 nm and 70.31 ± 10.07 nm) on the anaerobic co-digestion of hybrid Pennisetum and sludge were investigated through a 36-day fermentation experiment. The results showed that biogas production in a wet AD process improved when the diameter of the TiO2 nanoparticles increased. Digesting using TiO2 nanoparticles with a diameter of (70.31 ± 10.07) nm (T2 system) demonstrated a 162.6% higher biogas production compared to digestion with the 40 nm TiO2 nanoparticle system. Moreover, the impact of the TiO2 concentration on anaerobic digestion (AD) was also investigated. The T2 system biogas production was increased by 76.95%, 49.80%, 45.45%, and 5.88% in a wet AD process. Moreover, although the addition of T2 did not shorten the lag phase of the process, it significantly affected the microbial community of the AD system. 16S RNA amplicon sequencing data demonstrated that hydrogenotrophic methanogens, such as Methanobacterium sp. and Methanobrevibacter sp., played a key role in methane production of the system. The addition of T2 increased the microbial community diversity and richness.