title: Polyphenolic compounds progress during olive mill wastewater sludge and poultry manure co-composting, and humic substances building (Southeastern Tunisia).
abstract: In Mediterranean areas, olive mill wastes pose a major environmental problem owing to their important production and their high polyphenolic compounds and organic acids concentrations. In this work, the evolution of polyphenolic compounds was studied during co-composting of olive mill wastewater sludge and poultry manure, based on qualitative (G-50 sephadex) and quantitative (Folin-Ciocalteu), as well as high pressure liquid chromatography analyses. Results showed a significant polyphenolic content decrease of 99% and a noticeable transformation of low to high molecular weight fraction during the compost maturation period. During this step, polyphenols disappearance suggested their assimilation by thermophilic bacteria as a carbon and energy source, and contributed to humic substances synthesis. Polyphenolic compounds, identified initially by high pressure liquid chromatography, disappeared by composting and only traces of caffeic, coumaric and ferulic acids were detected in the compost. In the soil, the produced compost application improved the chemical and physico-chemical soil properties, mainly fertilising elements such as calcium, magnesium, nitrogen, potassium and phosphorus. Consequently, a higher potato production was harvested in comparison with manure amendment.
authors.affiliation: University of Sfax, Research unit: Study and Management of Coastal and Urban Environments, Sfax, Tunisia Faculty of Sciences of Sfax, Sfax, Tunisia hafedhrigane@yahoo.fr.
authors.forename: Hafedh
authors.initials: H
authors.lastname: Rigane
authors.affiliation: University of Sfax, Research unit: Study and Management of Coastal and Urban Environments, Sfax, Tunisia Faculty of Sciences of Sfax, Sfax, Tunisia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Chtourou
authors.affiliation: University of Sfax, Research unit: Study and Management of Coastal and Urban Environments, Sfax, Tunisia Faculty of Sciences of Sfax, Sfax, Tunisia.
authors.forename: Imen
authors.initials: I
authors.lastname: Ben Mahmoud
authors.affiliation: University of Sfax, Research unit: Study and Management of Coastal and Urban Environments, Sfax, Tunisia Preparatory Institute of Engineering Studies of Sfax, Sfax, Tunisia.
authors.forename: Khaled
authors.initials: K
authors.lastname: Medhioub
authors.affiliation: University of Sfax, Research unit: Study and Management of Coastal and Urban Environments, Sfax, Tunisia National Engineering School of Sfax, Sfax, Tunisia.
authors.forename: Emna
authors.initials: E
authors.lastname: Ammar
mesh_terms: D000383:Agriculture; D000818:Animals; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D006812:Humic Substances / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D008372:Manure; D008982:Molybdenum; D031658:Olea; D059808:Polyphenols / Q000032:analysis*; D011200:Poultry; D059027:Recycling; D012722:Sewage; D017973:Tungsten Compounds; D014416:Tunisia; D062065:Wastewater
chemical_list: D006812:Humic Substances; D007220:Industrial Waste; D008372:Manure; D008982:Molybdenum; D059808:Polyphenols; D012722:Sewage; D017973:Tungsten Compounds; D062065:Wastewater; C029556:Folin's phenol reagent
keywords: Polyphenols; composting; high pressure liquid chromatography; humic substances; olive mill wastewater sludge