Growth optimisation of microalga mutant at high CO2 concentration to purify undiluted anaerobic digestion effluent of swine manure

Jun Cheng, Jiao Xu, Yun Huang, Yuyou Li, Junhu Zhou, Kefa Cen

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Growth rate of the microalga Chlorella PY-ZU1 mutated by nuclear irradiation was optimised for use in the purification of undiluted anaerobic digestion effluent of swine manure (UADESM) with 3745mgL-1 chemical oxygen demand (COD) and 1135mgL-1 total nitrogen content. The problem of accessible carbon in UADESM was solved by continuous introduction of 15% (v/v) CO2. Adding phosphorus to UADESM and aeration of UADESM before inoculation both markedly reduced the lag phase of microalgal growth. In addition, the biomass yield and average growth rate of Chlorella PY-ZU1 increased significantly to 4.81gL-1 and 601.2mgL-1d-1, respectively, while the removal efficiencies of total phosphorus, COD and ammonia nitrogen increased to 95%, 79% and 73%, respectively. Thus, the findings indicate that Chlorella PY-ZU1 can be used for effective purification of UADESM, while the biomass can be safely used as animal feed supplement.

Original languageEnglish
Pages (from-to)240-246
Number of pages7
JournalBioresource Technology
Volume177
DOIs
Publication statusPublished - 2015 Feb 1

Keywords

  • Anaerobic digestion effluent
  • High CO concentration
  • Microalgae
  • Nuclear irradiation
  • Pollutant removal

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Growth optimisation of microalga mutant at high CO<sub>2</sub> concentration to purify undiluted anaerobic digestion effluent of swine manure'. Together they form a unique fingerprint.

  • Cite this