Bioremediation of cattle manure using microalgae after pre-treatment with  biomass ash

Viegas, Catarina; Gouveia, Luisa; Margarida Gonçalves, Maria

http://hdl.handle.net/10400.9/3642

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Authors

Viegas, Catarina

Gouveia, Luisa

Margarida Gonçalves, Maria

Abstract(s)

ABSTRACT: In this work, cattle manure was diluted and pre-treated with biomass ash to yield a liquid fraction and a solid precipitate. Microalgae grown in the liquid fraction, in batch and semi-continuous mode, achieved maximum biomass productivities of 522.9 and 554.3 mg L−1 day−1 (12 days) for Chlorella protothecoides and Tetradesmus obliquus, respectively. Nutrient removal efficiency was highest for the semicontinuous mode with replacement of 10% of reactor volume every 48 h. The produced algal biomass was characterized for its nutrient composition. Both, algal biomass, and precipitate aqueous extracts, were evaluated as biostimulants for wheat and watercress seeds Increments in the germination index were 177% for wheat with Chlorella protothecoides and 34% for watercress with Tetradesmus obliquus. The strategy adopted in this work is coherent with circular economy principles, combining effluent treatment with the production of added-value materials that could be used as biostimulants or animal feed additives.

Keywords

Microalgae Wastewater treatment Biomass Pre-treatment Fertilizers

URI

http://hdl.handle.net/10400.9/3642

Citation

Viegas, Catarina... [et.al.] - Bioremediation of cattle manure using microalgae after pre-treatment with biomass ash. In: Bioresource Technology Reports, 2021, Vol. 14, article nº 100681