Sludge management in lagoons: The role of denitrification as a function of carbon biodegradation. (September 2021)

• Record Type: Journal Article
• Authors: Mutchamua, Heitor Henriques Guedes; Bolsan, Alice Chiapetti; Bonatto, Charline; Chini, Angélica; Venturin, Bruno; Hollas, Camila Ester; Bonassa, Gabriela; Antes, Fabiane Goldschmidt; Treichel, Helen; Di Luccio, Marco; Kunz, Airton
• Is Part Of: Bioresource technology reports. Volume 15(2021)
• Publication Date: 2021-09
• Subjects: Carbon removal -- Organic matter -- Nitrate -- Swine wastewater -- Sludge treatment; Biomass energy -- Periodicals; Biotransformation (Metabolism) -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Waste products as fuel -- Periodicals; Waste products as fuel; Organic wastes; Factory and trade waste; Biotransformation (Metabolism); Biomass energy; Agricultural wastes; Periodicals; Electronic journals; 662.88
• DOI: 10.1016/j.biteb.2021.100802
• Languages: English
• ISSNs: 2589-014X

Abstract

Abstract: Sludge from the bottom of an anaerobic lagoon storage system contains nutrient residues, as well as inorganic and organic matter. These wastes have polluting impacts on swine farms, and beyond the management alternatives, few studies apply economic and sustainable biological methods to reduce their effects. In this study, denitrification was proposed as an alternative sludge treatment for settling tanks (ST), biodigesters, and stabilized lagoons. The sludge sources had different deposition times and bioavailable carbon concentrations. Accordingly, the effects of agitation and carbon and nitrate concentrations were evaluated. The best removal feasibility was presented with the ST sludge, corresponding to 25% (v v −1 ) of the background volume, achieving higher total organic carbon (1342 mg L −1 day −1 ) and nitrate (279 mg L −1 day −1 ) removal. Furthermore, sludge management by denitrification was affected by carbon bioavailability and proven to be cost-effective, with 125 days required for processing. Graphical abstract: Unlabelled Image Highlights: Denitrification is a promising alternative for sludge management from lagoons. Sludge stabilization is not affected by agitation. Sludge stabilization is affected by the carbon bioavailability and NO3 − concentration. With cost-effectiveness, 125 days is required to reach sludge stabilization.