Treatment of non-sterile biogas slurry from a pig farm using microalgae isolated from the activated sludge of sewage plants

Numerous studies have been conducted on the use of microalgae to treat sterile biogas slurry (BS). However, in large-scale applications, this approach undoubtedly results in high costs and inefficiencies. Therefore, it is crucial to identify microalgae capable of growing in non-sterilized and undiluted BS while effectively treating major pollutants. The findings of this study reveal that microalgae isolated and purified from activated sludge in sewage treatment plants can withstand crude BS containing high concentrations of ammonia nitrogen and effectively remove ammonia nitrogen and total phosphorus. Additionally, they exhibit some removal capabilities for chemical oxygen demand, heavy metals, pathogens, antibiotics, and certain antibiotic resistance genes.