Impact of sludge treatments on the extractability and fate of acetyl sulfamethoxazole residues in amended soils. (March 2018)

• Record Type: Journal Article
• Authors: Geng, Chunnu; Bergheaud, Valérie; Garnier, Patricia; Zhu, Yong-Guan; Haudin, Claire-Sophie
• Is Part Of: Chemosphere. Volume 194(2018)
• Page Start: 828
• Page End: 836
• Publication Date: 2018-03
• Subjects: Sulfonamide -- Availability -- Sorption -- Sludge organic matter -- Lime addition -- Thermal drying; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.12.003
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Sludge recycled in agriculture may bring antibiotics into cropped soils. The nature, total amount, and availability of the antibiotics in soil partly depend on the sludge treatments. Our paper compares the fate of N-acetyl sulfamethoxazole (AC-SMX) residues between soils incubated with the same sludge but submitted to different processes before being added in soil. The fate of 14 C-AC-SMX residues was studied in mixtures of soil and sludges at different treatment levels: 1) activated and 2) centrifuged sludges, both enriched with 14 C-AC-SMX, and 3) limed and 4) heat-dried sludges obtained by treating the previously contaminated centrifuged sludge. The evolution of the extractability of 14 C residues (CaCl2, methanol) and their mineralization were followed during 119 days. More than 80% of the initial 14 C-activity was no longer extractable after 14 days, except in soil with limed sludge. Liming and drying the centrifuged sludge decreased the mineralized 14 C fraction from 5.7-6.4% to 1.2–1.8% and consequently, the corresponding soils contained more 14 C residues after 119 days. Although 14 C residues were more CaCl2 -extractable in soil with limed sludge, they seemed to be poorly bioavailable for biodegradation. For all solid sludges, the mineralization rate of 14 C-AC-SMX residues was strongly correlated to that of sludge organic carbon, with a coefficient three times lower for the limed and dried sludges than for the centrifuged sludge after 14 days. Graphical abstract: Highlights: The fate of AC-SMX brought with different treated sludges was investigated in soil. The extractability of AC-SMX residues decreased most in the first 14 days. Water-extractability of AC-SMX residues in soil was the highest for limed sludge. Liming and drying sludge decreased the mineralization of AC-SMX residues in soils. The mineralization rates of 14 C-AC-SMX residues and sludge organic C were correlated.