Effects of microalgal (Tetradesmus obliquus MCX38) attachment on photobioreactor treatment efficiency of raw swine wastewater

[Display omitted] •A newly indigenous microalgae Tetradesmus obliquus MCX38 was isolated.•The attachment of microalgae reduced the light intensity from 2,000 lx to 936 lux.•The optimal attachment time of microalgae for swine wastewater treatment was 24 h.•The removal efficiency can reach 87% (COD) a...

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Bibliographic Details
Published in:Bioresource technology 2024-07, Vol.403, p.130866-130866, Article 130866
Main Authors: Ma, Chengxiao, Qu, Wenying, Ho, Shih-Hsin, Li, Junfeng, Li, Fadong, Yi, Lijuan
Format: Article
Language:English
Subjects:
Cell adhesion
Extracellular polymeric substances
Microalgae
Piggery wastewater
Pollutant removal
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Summary:[Display omitted] •A newly indigenous microalgae Tetradesmus obliquus MCX38 was isolated.•The attachment of microalgae reduced the light intensity from 2,000 lx to 936 lux.•The optimal attachment time of microalgae for swine wastewater treatment was 24 h.•The removal efficiency can reach 87% (COD) and close to 100% (NH4+-N and PO43--P).•The secretion of EPS was main mechanism for microalgal attachment. Attachment of microalgae on the inner surfaces of photobioreactors impacts the efficiency of swine wastewater treatment by reducing the light intensity, which has been overlooked in previous studies. This study investigated the relationship between microalgal attachment biomass and light intensity in photobioreactors, determined the optimal attachment time for effective pollutant removal, and clarified the mechanisms of microalgal attachment in swine wastewater. After 9 days of treatment, the attached biomass in the photobioreactor increased from 0 to 6.4 g/m2, decreasing the light intensity from 2,000 to 936 lux. At the 24 h optimal attachment time, the concentrations of chemical oxygen demand, ammonia nitrogen, and total phosphorus decreased from 2725.1, 396.4, and 87.2 mg/L to 361.2, 4.9, and 0.8 mg/L, respectively. Polysaccharides in the extracellular polymeric substances released by microalgae play a significant role in facilitating microalgae attachment. Optimizing the microalgal attachment time within photobioreactors effectively mitigates pollutant concentrations in swine wastewater.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2024.130866