Efficient use of liquid digestate in microalgae cultivation for high biomass production and nutrient recovery

Akkaya E. , Can-Güven E.

WATER SCIENCE AND TECHNOLOGY: WATER SUPPLY, vol.0, pp.1-10, 2022 (Peer-Reviewed Journal)

  • Publication Type: Article / Article
  • Volume: 0
  • Publication Date: 2022
  • Doi Number: 10.2166/ws.2022.301
  • Journal Indexes: Science Citation Index Expanded, Scopus, PASCAL, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Compendex, EMBASE, Environment Index, Geobase, ICONDA Bibliographic, Pollution Abstracts, Veterinary Science Database, Directory of Open Access Journals
  • Page Numbers: pp.1-10


Abstract In this study, different pretreatment methods were applied to liquid digestate (LD) for the growth of the mixed microalgal culture. In addition, nutrient removal in the LD was investigated. Dilution, filtration, and centrifugation were applied as pre-treatment methods. Microalgal growth was evaluated as dry weight (DW) and nutrient removal was investigated with the analysis of ammonium (NH4+-N) and phosphate (PO4−3-P). Microalgal DW constantly increased throughout the experiment and reached the maximum values of 4.24 g/L, 4.02 g/L, and 1.47 g/L in centrifuged, diluted, and filtered medium, respectively. Maximum NH4+ (97.7%) and PO4−3 (50.4%) removal efficiency were observed in the centrifuged LD. Based on the results of this study, the optimum growth medium for microalgal growth was centrifuged LD but this culture can be cultivated in diluted LD up to 40 fold. Results also showed that using LD for microalgae production is a suitable application for both nutrient supply for microalgal growth and nutrient recovery from LD.