Abstract
The aim of the study was to investigate the potential of microalgal cultivation on anaerobic liquid digestate as a growth medium. The two methods of liquid digestate treatment including centrifugation and distillation and the two algal strains (Chlorella vulgaris and Arthrospira platensis) were compared. Additionally, the volume of the liquid digestate used to prepare the culture medium constituted from 10 to 50% of the medium volume. The study demonstrated that the highest C. vulgaris and A. platensis biomass productions of 2490 mg TS/L and 2990 mg/L, respectively, were obtained by adding 50% of distilled digestate to a growth medium. Regarding centrifuged liquid digestate, only 10% dilution was required to obtain the maximum final biomass concentration. A. platensis removed 81.1% and 66.4% of the total nitrogen from medium prepared on distilled and centrifuged digestate, respectively, while C. vulgaris ensured 64.1% and 47.1% of removal, respectively. The phosphorus removal from both culture media was higher than 94.2% with A. platensis, while it was 70.4% from distilled and 87.4% from centrifuged media with C. vulgaris. The study confirmed a great potential of microalgal biomass production on anaerobic liquid digestate with a high treatment efficiency of digestate.
Highlights
A new 2030 Framework for climate and energy sets the targets and policy objectives aiming to help the EU countries achieve a more competitive, secure, and sustainable energy system, as well as to meet its long-term 2050 greenhouse gas reduction target
The results showed that the treatment method of digestate used to prepare a growth medium mostly influenced the nutrient removal, and A. platensis was able to accumulate more nitrogen and phosphorus than C. vulgaris
The study confirmed a great potential of microalgal cultivation on anaerobic liquid digestate for their treatment, as well as for the production of microalgae biomass
Summary
A new 2030 Framework for climate and energy sets the targets and policy objectives aiming to help the EU countries achieve a more competitive, secure, and sustainable energy system, as well as to meet its long-term 2050 greenhouse gas reduction target. To achieve these goals, significant investments need to be made in the new low-carbon technologies and the advanced technologies for energy and fuel production. The European bioenergy sector applies a wide range of technologies and processes to exploit the energetic potential of the biomass feedstocks, but anaerobic digestion (AD) is the main conversion pathway to turn wet biomass feedstocks into valuable biogas [3]. For the wider adoption of AD technology in the short term, methods for economic digestate processing and management should be developed
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