A review on facilitating bio-wastes degradation and energy recovery efficiencies in anaerobic digestion systems with biochar amendment

Gaojun Wang, Yu Li, Li Sheng, Yao Xing, Guohao Liu, Gaofei Yao, Huu Hao Ngo, Qian Li, Xiaochang C. Wang, Yu You Li, Rong Chen

Research output: Contribution to journalReview articlepeer-review

3 Citations (Scopus)

Abstract

In this review, progress in the potential mechanisms of biochar amendment for AD performance promotion was summarized. As adsorbents, biochar was beneficial for alleviating microbial toxicity, accelerating refractory substances degradation, and upgrading biogas quality. The buffering capacity of biochar balanced pH decreasing caused by volatile fatty acids accumulation. Moreover, biochar regulated microbial metabolism by boosting activities, mediating electron transfer between syntrophic partners, and enriching functional microbes. Recent studies also suggested biochar as potential useful additives for membrane fouling alleviation in anaerobic membrane bioreactors (AnMBR). By analyzing the reported performances based on different operation models or substrate types, debatable issues and associated research gaps of understanding the real role of biochar in AD were critically discussed. Accordingly, Future perspectives of developing biochar-amended AD technology for real-world applications were elucidated. Lastly, with biochar-amended AD as a core process, a novel integrated scheme was proposed towards high-efficient energy-resource recovery from various bio-wastes.

Original languageEnglish
Article number123777
JournalBioresource Technology
Volume314
DOIs
Publication statusPublished - 2020 Oct

Keywords

  • Adsorption behaviors
  • Anaerobic digestion
  • Biochar
  • Energy recovery
  • Syntrophic metabolism

ASJC Scopus subject areas

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

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