Nutrient recycle from defatted microalgae (Aurantiochytrium) with hydrothermal treatment for microalgae cultivation

Taku Michael Aida, Ryouma Maruta, Yuuhiko Tanabe, Minori Oshima, Toshiyuki Nonaka, Hiroki Kujiraoka, Yasuaki Kumagai, Masaki Ota, Iwane Suzuki, Makoto M. Watanabe, Hiroshi Inomata, Richard L. Smith

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Defatted heterotrophic microalgae (Aurantiochytrium limacinum SR21) was treated with high temperature water (175–350 °C, 10–90 min) to obtain nitrogen and phosphorous nutrients as a water soluble fraction (WS). Yields of nitrogen and phosphorous recovered in WS varied from 38 to 100% and from 57 to 99%, respectively. Maximum yields of nitrogen containing compounds in WS were proteins (43%), amino acids (12%) and ammonia (60%) at treatment temperatures of 175, 250 and 350 °C, respectively. Maximum yield of phosphorous in WS was 99% at a treatment temperature of 250 °C. Cultivation experiments of microalgae (A. limacinum SR21) using WS obtained at 200 and 250 °C showed positive growth. Water soluble fractions from hydrothermal treatment of defatted microalgae are effective nitrogen and phosphorous nutrient sources for microalgae cultivation.

Original languageEnglish
Pages (from-to)186-192
Number of pages7
JournalBioresource Technology
Volume228
DOIs
Publication statusPublished - 2017 Jan 1

Keywords

  • Amino acid
  • Biosolid treatment process
  • Internal recycle
  • Phosphorous
  • Protein

ASJC Scopus subject areas

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

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