title: Phosphogypsum biotransformation by aerobic bacterial flora and isolated Trichoderma asperellum from Tunisian storage piles.
abstract: Aerobic microorganisms able to grow on phosphogypsum (PG), characterized by heavy metals accumulation and high acidity were investigated by enrichment cultures. The PG was used at different concentrations, varying from 20 to 200 g/L in the enrichment culture medium supplemented with compost and Tamarix roots. This treatment reduced COD and heavy metals PG concentration. An efficient isolated fungus, identified by molecular approach as Trichoderma asperellum, was able to grow on PG as the sole carbon and energy sources at the different experimented concentrations, and to increase the culture media pH of the different PG concentrations used to 8.13. This fact would be the result of alkaline compound released during the fungus PG solubilization. Besides, the heavy metals and COD removal exceeded 52% after 7 days culture. At 200 g/LPG concentration, the experimented strain was able to reduce COD by 52.32% and metals concentrations by 73% for zinc, 63.75% for iron and 50% for cadmium. This exhibited the T. asperellum efficiency for heavy metals accumulation and for phosphogypsum bioremediation.
authors: Research Unit "Coastal and Urban Environments" National Engineering School of Sfax, BP 1173, 3038 Sfax, Tunisia; Tunisian Chemical Group, M'Dhilla-Gafsa factory, B.P. 215, 2100 Gafsa, Tunisia.
authors: Jihen
authors: J
authors: Jalali
authors: Research Unit "Coastal and Urban Environments" National Engineering School of Sfax, BP 1173, 3038 Sfax, Tunisia.
authors: Salwa
authors: S
authors: Magdich
authors: Research Unit "Coastal and Urban Environments" National Engineering School of Sfax, BP 1173, 3038 Sfax, Tunisia.
authors: Raja
authors: R
authors: Jarboui
authors: Tunisian Chemical Group, M'Dhilla-Gafsa factory, B.P. 215, 2100 Gafsa, Tunisia.
authors: Mouna
authors: M
authors: Loungou
authors: Research Unit "Coastal and Urban Environments" National Engineering School of Sfax, BP 1173, 3038 Sfax, Tunisia. Electronic address: ammarenis@yahoo.fr.
authors: Emna
authors: E
authors: Ammar
mesh_terms: D001420:Bacteria, Aerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D001711:Biotransformation; D002133:Calcium Sulfate / Q000378:metabolism*; D004271:DNA, Fungal / Q000235:genetics; D019216:Metals, Heavy / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism*; D014242:Trichoderma / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D014416:Tunisia
chemical_list: D004271:DNA, Fungal; D019216:Metals, Heavy; C077769:phosphogypsum; D010758:Phosphorus; D002133:Calcium Sulfate
keywords: Aerobic bacteria; COD Reduction; Heavy metals; Phosphogypsum; Trichoderma asperellum