title: A compact process for the treatment of olive mill wastewater by combining wet hydrogen peroxide catalytic oxidation and biological techniques.
abstract: A system based on combined actions of catalytic wet oxidation and microbial technologies for the treatment of highly polluted OMW containing polyphenols was studied. The wet hydrogen peroxide catalytic oxidation (WHPCO) process has been investigated in the semi-batch mode at atmospheric pressure, using aluminium-iron-pillared inter layer clay ((Al-Fe)PILC), under two different catalytic processes: ((Al-Fe)PILC/H(2)O(2)/ultraviolet radiations) at 25°C and ((Al-Fe)PILC/H(2)O(2)) at 50°C. The results show that raw OMW was resistant to the photocatalytic process. However ((Al-Fe)PILC/H(2)O(2)), system operating at 50°C reduced considerably the COD, colour and total phenolic contents, and thus decreased the inhibition of the marine photobacteria Vibrio fischeri luminescence by 70%. This study also examined the feasibility of coupling WHPCO and anaerobic digestion treatment. Biomethanisation experiments performed with raw OMW or pre-treated OMW proved that pre-treatments with ((Al-Fe)PILC/H(2)O(2)) system, for more than 2 h, resulted in higher methane production. Both untreated OMW as well as 2-h pre-treated OMW revealed as toxic to anaerobic bacteria.
authors.affiliation: Laboratoire des BioProcédés, Centre de Biotechnologie de Sfax, BP 1177, 3018 Sfax, Tunisia.
authors.forename: Samia
authors.initials: S
authors.lastname: Azabou
authors.forename: Wahiba
authors.initials: W
authors.lastname: Najjar
authors.forename: Mohamed
authors.initials: M
authors.lastname: Bouaziz
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Ghorbel
authors.forename: Sami
authors.initials: S
authors.lastname: Sayadi
mesh_terms: D000535:Aluminum; D000538:Aluminum Silicates; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D002384:Catalysis; D000077215:Clay; D005419:Flavonoids; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste / Q000517:prevention & control*; D007501:Iron; D031658:Olea; D010084:Oxidation-Reduction; D010636:Phenols; D059808:Polyphenols; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism
chemical_list: D000538:Aluminum Silicates; D005419:Flavonoids; D007220:Industrial Waste; D010636:Phenols; D059808:Polyphenols; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D000535:Aluminum; D007501:Iron; D000077215:Clay