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Comprehensive role of thermal combined ultrasonic pre-treatment in sewage sludge disposal

Liu, Hongbo ; Wang, Xingkang ; Qin, Song ; Lai, Wenjia ; Yang, Xin ; Xu, Suyun ; Lichtfouse, Eric

The Science of the total environment, 2021-10, Vol.789, p.147862-147862, Article 147862 [Periódico revisado por pares]

Elsevier B.V

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  • Título:
    Comprehensive role of thermal combined ultrasonic pre-treatment in sewage sludge disposal
  • Autor: Liu, Hongbo ; Wang, Xingkang ; Qin, Song ; Lai, Wenjia ; Yang, Xin ; Xu, Suyun ; Lichtfouse, Eric
  • Assuntos: Antibiotics ; Dissolved organic matters ; Earth Sciences ; Geochemistry ; Sciences of the Universe ; Sewage sludge ; Thermal pre-treatment ; Ultrasonic pre-treatment
  • É parte de: The Science of the total environment, 2021-10, Vol.789, p.147862-147862, Article 147862
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Thermal/ultrasonic pre-treatment of sludge has been proven to break the hydrolysis barriers of sewage sludge (SS) and improve the performance of anaerobic digestion (AD). In this study, the objective was to investigate whether the combination of two pre-treatment methods can achieve better results on the AD of SS. The results indicated that, compared with the control group and separate pre-treatment groups, the thermal combined ultrasonic pre-treatment presented more obvious solubilization of soluble proteins, polysaccharides, and other organic matters in SS. The combined method promoted the dissolution of protein-like substances more effectively, with biogas production increased by 19% and the volatile solid (VS) removal rate improved to above 50% compared with the control group. The capillary suction time is reduced by about 85%, which greatly improved the dewatering performance of SS. In addition, the combined method has advantages in degrading sulfonamide antibiotics, roxithromycin and tetracycline. Particularly, by analyzing the interaction between the degradation of different antibiotics and the composition of dissolved organic matters (DOMs), it was found that the composition of DOMs could affect the degradability of different antibiotics. Among them, the high content of tyrosine-like and tryptophan-like was conducive to the degradation of sulfamethoxazole, and the high content of fulvic acid-like and humic acid-like was conducive to the degradation of roxithromycin and tetracycline. This work evaluated the comprehensive effect of thermal combined ultrasonic pre-treatment on SS disposal and provided useful information for its engineering. [Display omitted] •Combined thermal and ultrasonic pre-treatment was proposed to enhance AD performance.•The combined method significantly enhanced the dissolution of DOMs in SS.•The combined method increased biogas production and degradation of antibiotics.•The correlation between DOMs and the degradation of antibiotics was discussed.•The comprehensive role of this combined method in SS disposal has been elucidated.
  • Editor: Elsevier B.V
  • Idioma: Inglês
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