Nutrient recovery from ethanol co-products by a novel mycoalgae biofilm: attached cultures of symbiotic fungi and algae

Aravindan Rajendran, Tyler Fox, Bo Hu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

BACKGROUND: Fungal and algae treatment of food-industry waste opens a new avenue for valorizing waste to valuable products through the production of desirable cell biomass. A novel mycoalgae biofilm (symbiotic growth of algae and fungi) was developed in ethanol co-products, the profuse remains from the ethanol distillation process. RESULTS: The mycoalgae biofilm flasks produced more biomass compared with pure fungal cultures under all the conditions tested. The total microbial biomass concentration in mycoalgae biofilm increased from 5.998 g L−1 at 4 d (98.81% fungal biomass and 1.19% algae biomass) to 9.358 g L−1 at 12 d (97.2% fungal biomass and 2.8% algae biomass) with a drop in attached residual solids from 6.304 g L−1 at 4 d to 3.349 g L−1 at 12 d in 10× condensed distillers solubles medium. The high nutrient concentration of P (818 mg L−1) and N (924 mg L−1) in the samples was recovered in the attached mycoalgae biomass at 55.7% and 74%, respectively, with a reduction in COD of up to 65.6%. CONCLUSION: The results show that ethanol co-products support excellent mycoalgae biofilm growth. The nutrients in ethanol co-products can be efficiently recovered and recycled for agricultural applications and better nutrient management.

Original languageEnglish (US)
Pages (from-to)1766-1776
Number of pages11
JournalJournal of Chemical Technology and Biotechnology
Volume92
Issue number7
DOIs
StatePublished - Jul 2017

Keywords

  • Chlorella vulgaris
  • Mucor circinelloides
  • condensed distillers soluble (CDS)
  • ethanol co-products
  • mycoalgae biofilm

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