title: Feasibility of treating emulsified oily and salty wastewaters through coagulation and bio-regenerated GAC filtration.
abstract: In the present study, chemical oxygen demand (COD) removal by coagulation and packed-columns of both fresh and bioregenerated granular activated carbon (GAC) is reported as a feasible treatment for saline and oily wastewaters (slops) generated from marine oil tankers cleaning. The use of Ferric chloride (FeCl3), Aluminium sulphate (Al2(SO4)3) and Polyaluminum chloride (Al2(OH3)Cl3) was evaluated in the pre-treatment by coagulation of a real slop, after a de-oiling phase in a tank skimmer Comparison of coagulation process indicated that Polyaluminum chloride and Aluminium sulphate operate equally well (20-30% of COD removal) when applied at their optimal dose (40 and 90 mg/l respectively) but the latter should be preferred in order to significantly control the sludge production. The results from the column filtration tests indicated the feasibility of using the selected GAC (Filtrasorb 400 -Calgon Carbon Corporation) to achieve the respect of the discharge limits in the slops treatment with a carbon usage rate in the range 0.1-0.3 kg/m3of treated effluent. Moreover, biological regeneration through Alcalinovorax borkumensis SK2 was proved to be a cost-effective procedure since the reuse of spent GAC through such regeneration process for further treatment could still achieve approximately 90% of the initial sorption capacity, reducing then costs for the use of new sorbents and also the need for waste disposal.
authors.affiliation: Department of Industrial and Mechanical Engineering, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy. Electronic address: gmancini@dii.unict.it.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Mancini
authors.affiliation: Department of Industrial and Mechanical Engineering, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy. Electronic address: michelepanzica@alice.it.
authors.forename: Michele
authors.initials: M
authors.lastname: Panzica
authors.affiliation: Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy. Electronic address: debora.fino@polito.it.
authors.forename: Debora
authors.initials: D
authors.lastname: Fino
authors.affiliation: Institute for Coastal Marine Environment (IAMC) - CNR U.O.S. of Messina, Spianata San Raineri 86, 98121 Messina, Italy. Electronic address: simone.cappello@iamc.cnr.it.
authors.forename: Simone
authors.initials: S
authors.lastname: Cappello
authors.affiliation: Institute for Coastal Marine Environment (IAMC) - CNR U.O.S. of Messina, Spianata San Raineri 86, 98121 Messina, Italy. Electronic address: michail.yakimov@iamc.cnr.it.
authors.forename: Michail M
authors.initials: MM
authors.lastname: Yakimov
authors.affiliation: ENEA Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Casaccia Research Center, Via Anguillarese 301, Rome, Italy. Electronic address: antonella.luciano@enea.it.
authors.forename: Antonella
authors.initials: A
authors.lastname: Luciano
mesh_terms: D057919:Biological Oxygen Demand Analysis; D002606:Charcoal; D005374:Filtration; D012722:Sewage; D014865:Waste Disposal, Fluid; D062065:Wastewater
chemical_list: D002606:Charcoal; D012722:Sewage; D062065:Wastewater
keywords: Alcanivorax borkumensis; Coagulation; Cost reduction; GAC bioregeneration; Saline wastewaters