Progressive waste management transforming biogas and microalgae into nutrient-rich feed for pigs

Abstract

This study examines the effectiveness of microalgae biomass in removing nutrients and its nutrient content when cultivated in anaerobic digestate at various dilution ratios (1:10, 1:15, and 1:20). The study specifically focuses on the potential use of microalgae biomass in pig feed. The findings indicate that a dilution ratio 1:10 produces the most effective results in eliminating crucial nutrients, namely ammonium nitrogen (NH4-N) and phosphorus (P), with removal rates of 85% and 80%, respectively. When the dilution ratio reached 1:15 and 1:20, nutrient removal efficiency decreased, emphasizing nutrient availability's significance in the digestate for successful microalgae production. A closer look at the macro and micronutrient content of the microalgae biomass showed that the 1:10 dilution ratio consistently produced the most nutrients. The biomass has 45-50% protein, which helps pigs grow and develop muscles. The 1:10 dilution increases calcium, phosphorus, and magnesium concentrations, improving bone health, metabolic processes, and pig vigor. This ratio boosts pig feed nutrition and supports sustainable waste management. Future research should examine the long-term impacts of adding microalgae biomass to pig feeds and its economic viability for widespread agricultural application.