Co-digestion of chicken manure and microalgae Chlorella 1067 grown in the recycled digestate: Nutrients reuse and biogas enhancement

Ruirui Li, Na Duan, Yuanhui Zhang, Zhidan Liu, Baoming Li, Dongming Zhang, Haifeng Lu, Taili Dong

Research output: Contribution to journalArticle

Abstract

The present investigation targeted on a sustainable co-digestion system: microalgae Chlorella 1067 (Ch. 1067) was cultivated in chicken manure (CM) based digestate and then algae biomass was used as co-substrate for anaerobic digestion with CM. About 91% of the total nitrogen and 86% of the soluble organics in the digestate were recycled after the microalgae cultivation. The methane potential of co-digestion was evaluated by varying CM to Ch. 1067 ratios (0:10, 2:8, 4:6, 6:4, 8:2, 10:0 based on the volatile solids (VS)). All the co-digestion trials showed higher methane production than the calculated values, indicating synergy between the two substrates. Modified Gompertz model showed that co-digestion had more effective methane production rate and shorter lag phase. Co-digestion (8:2) achieved the highest methane production of 238.71 mL⋅(g VS)−1 and the most significant synergistic effect. The co-digestion (e.g. 8:2) presented higher and balanced content of dominant acidogenic bacteria (Firmicutes, Bacteroidetes, Proteobacterias and Spirochaetae). In addition, the archaea community Methanosaeta presented higher content than Methanosarcina, which accounted for the higher methane production. These findings indicated that the system could provide a practicable strategy for effectively recycling digestate and enhancing biogas production simultaneously.

Original languageEnglish (US)
Pages (from-to)247-254
Number of pages8
JournalWaste Management
Volume70
DOIs
StatePublished - Dec 2017

Keywords

  • Biogas
  • Chicken manure
  • Chlorella 1067
  • Co-digestion
  • Digestate

ASJC Scopus subject areas

  • Waste Management and Disposal

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