Investigation of anaerobic digestion of Chlorella sp. and Micractinium sp. grown in high-nitrogen wastewater and their co-digestion with waste activated sludge

Meng Wang, Chul Park

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

This study investigated two wildtype green algae, Micractinium sp. and Chlorella sp., for their growth in high nitrogen wastewater (mixture of sludge centrate and primary effluent wastewater) and subsequent anaerobic digestion under mesophilic conditions. Extraction and analysis of extracellular polymeric substances (EPS) in both algal species during cultivation showed that Micractinium generated larger quantity of EPS-proteins than Chlorella. Anaerobic digestion of harvested algae showed the opposite trend that Chlorella allowed a higher CH4 yield on the volatile solids fed the digester (VSfed) of 230dm3kg-1 than Micractinium (209dm3kg-1). These results suggested that different growth patterns of two types of algae, with different quantity of EPS expressed, affected anaerobic digestibility and biogas yield. Co-digestion of algae with waste activated sludge (WAS) improved the volatile solids reduction, hydrolysis efficiency as well as the biogas yields of algae.

Original languageEnglish (US)
Pages (from-to)30-37
Number of pages8
JournalBiomass and Bioenergy
Volume80
DOIs
StatePublished - Sep 1 2015

All Science Journal Classification (ASJC) codes

  • Forestry
  • Renewable Energy, Sustainability and the Environment
  • Agronomy and Crop Science
  • Waste Management and Disposal

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