Integrated anaerobic digestion and algae cultivation for energy recovery and nutrient supply from post-hydrothermal liquefaction wastewater

Libin Yang, Buchun Si, Xiaobo Tan, Huaqiang Chu, Xuefei Zhou, Yuanhui Zhang, Yalei Zhang, Fangchao Zhao

Research output: Contribution to journalArticle

Abstract

Post-hydrothermal liquefaction wastewater (PHWW), which contains approximately 80% of original feedstock resources, shows great potential to achieve sustainable development of an environment-enhancing energy system. A combination of anaerobic digestion and algae cultivation was proposed for methane recovery and nutrient supply from PHWW. Granular activated carbon (GAC) and ozone were used to enhance energy recovery from the PHWW. The results indicated that with GAC addition, the maximum methane yield increased by 67.7%–228 mL/g CODremoval. In addition, Chlorella vulgaris displayed optimal growth in a 5-fold diluted digestate with a 2.32 g/L maximum biomass content and 180 mg/(L·d) biomass production rate. The total energy yield was 565 kJ/g COD, which was 27.4 times higher than that without GAC. Integration of anaerobic digestion and algae cultivation, particularly with GAC addition during fermentation, is a feasible and advantageous process for energy recovery from PHWW.

Original languageEnglish (US)
Pages (from-to)349-356
Number of pages8
JournalBioresource Technology
Volume266
DOIs
StatePublished - Oct 2018

Keywords

  • Energy recovery
  • Environment-enhancing energy
  • Granular activated carbon
  • Nutrient supply
  • Post-hydrothermal liquefaction wastewater (PHWW)

ASJC Scopus subject areas

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

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