Co-pyrolysis of biomass with magnesium and phosphorus: effect of magnesium content on phosphate release from biochar-based fertilizers

The disposal of vinasse, a nutrient-rich by-product of ethanol production, is challenging because of the low pH and emissions of harmful gases and smells. Here, biochars were produced by pyrolysis of mixtures of filter cake and vinasse (0.25 w/v to 1 w/v) at 550℃. The effects of filter cake to vinasse ratios on the biochar yield, pH, ash content, total nutrient (P, K, Ca, and Mg) content, and nutrient availability were investigated. Increasing the filter cake to vinasse ratio increased the biochar yield and ash content and lowered the biochar pH from 10.3 for 0.25-BC to 8.2 for filter cake biochar (FC-BC). Lower filter cake to vinasse ratios increased the total K content from 7.9 g∙kg‒1 for FC-BC to 75.9 for 0.25-BC. Nutrient recovery in the biochars was high (79.5% to 130.2%). Whereas P, Ca, and Mg extractability in water was <5%, the K extractability was 80% for 0.25-BC and decreased to 7.6% for FC-BC. Extractability of K, P, Ca, and Mg in 2% formic acid from vinasse-containing biochars was high (>50%). These results highlight the potential suitability for use in agricultural applications. Conversion of vinasse into value-added biochar could reduce waste treatment cost and improve soil health.

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Co-pyrolysis of biomass with magnesium and phosphorus: effect of magnesium content on phosphate release from biochar-based fertilizers

Cited by 2 publications

References 50 publications

Temperature-Dependent Phosphorus Speciation and Release from Magnesium-Rich Biochars

Temperature-Dependent Phosphorus Speciation and Release from Magnesium-Rich Biochars

Nutrient retention and availability of biochars prepared by co-pyrolysis of vinasse with sugarcane filter cake

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