Journal
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
Volume 53, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.algal.2020.102129
Keywords
Algae; Anaerobic digestate; Inhibition; Nutrient removal; Pretreatment
Categories
Funding
- USDA National Institute of Food and Agriculture
- Alabama Agricultural Experiment Station [2020-67021-31145]
- Auburn University Offices of the Provost
- Samuel Ginn College of Engineering
- National Science Foundation, Research Experience for Undergraduates [1658694]
- Alabama Agricultural Experiment Station [Hatch Project ALAOHIGGINS]
- Div Of Biological Infrastructure
- Direct For Biological Sciences [1658694] Funding Source: National Science Foundation
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The study found that pretreatment of digestate can promote algal growth and nutrient removal. Chlorella sorokiniana showed significant improvements in growth, nitrogen assimilation, and phosphorus removal after pretreatment on high-strength digestate; while the more sensitive strain benefitted from pretreatment on both low- and high-strength digestate.
Algal growth is often inhibited in full-strength anaerobic digestate. The objective of this study was to investigate conditions under which digestate pretreatment using bacteria is effective in promoting algal growth, nutrient removal, and favorable changes in algal biomass composition. Batch culture experiments were carried out using low- and high-strength municipal sludge anaerobic digestate, two algae strains of varying sensitivity to digestate inhibitors, short and long pretreatment periods, and axenic vs. non-axenic algal cultures. Pretreatment of digestate increased algal growth up to 40%, N assimilation (up to 29%), and P removal (340%) by Chlorella sorokiniana (resilient algae) when grown on high-strength digestate. Pretreatment did not increase algal growth or nutrient assimilation when Chlorella sorokiniana was combined with low-strength digestate. The more sensitive strain, Auxenochlorella protothecoides, benefitted from pretreatment on both low- and high-strength digestate, even preventing complete cell death in the latter. Pretreatment increased starch content but not lipid content of algae.
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