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

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