Anaerobic and photocatalytic treatments of post-hydrothermal liquefaction wastewater using H2O2

Diana Quispe-Arpasi, Raquel de Souza, Michael Stablein, Zhidan Liu, Na Duan, Haifeng Lu, Yuanhui Zhang, Alessandra Lopes de Oliveira, Rogers Ribeiro, Giovana Tommaso

Research output: Contribution to journalArticlepeer-review


Hydrothermal liquefaction (HTL) of cyanobacteria is a promising process for energy generation. However, post-HTL wastewater (PHWW) contains high amounts of organic matter and toxic compounds. This study investigated photocatalysis and anaerobic digestion (AD) for the treatment of PHWW from Spirulina conversion. H2O2 was used as an external oxidant in the photocatalysis or as a pretreatment in the AD process. The effect of different concentrations of H2O2 was evaluated. Greater CH4 production and higher COD reduction were observed when pre-treated PHWW was used. In the photocatalytic treatment, color and COD reduction reached 93.1% and 23.4%, respectively, with the addition of H2O2. When a combination of the oxidative pretreatment and AD was applied, a maximum energy recovery of 66.7% was reached, while the photocatalysis reached a maximum of 61.5%. Use of the best conditions with proper dilutions resulted in higher growths of the Spirulina cultivation compared to that with conventional algal media.

Original languageEnglish (US)
Pages (from-to)247-255
Number of pages9
JournalBioresource Technology Reports
StatePublished - Sep 2018


  • Anaerobic digestion
  • Energy recovery
  • Hydrogen peroxide
  • Hydrothermal liquefaction
  • Photocatalysis

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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