Potentials of anaerobic treatment for catalytically oxidized olive mill wastewater (OMW) |
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| Authors: | F El-Gohary A Tawfik M Badawy MA El-Khateeb |
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| Institution: | 1. Department of Research & Innovation, Galanakis Laboratories, Skalidi 34, GR-73131, Chania, Greece;2. Food Waste Recovery Group, ISEKI Food Association, Vienna, Austria;1. Instituto de la Grasa (CSIC), Avda. Padre García Tejero, 4.41012 Sevilla, Spain;2. Departamento de Ingeniería Química y Química Inorgánica, Facultad de Ciencias, Universidad de Córdoba, Campus Universitario de Rabanales, Edificio C-3, Ctra. Madrid-Cádiz, km 396, 14071 Córdoba, Spain;1. Molecular Biology and Biochemical Engineering Department, Pablo de Olavide University, 14013 Seville, Spain;2. Chemical Engineering Department, Granada University, 18071 Granada, Spain;1. Università degli Studi di Catania – DISPA – Via Valdisavoia 5, 95123 Catania, Italy;2. Consiglio Nazionale delle Ricerche-Istituto per i Sistemi Agricoli e Forestali del Mediterraneo (ISAFOM), U.O.S. di Catania. Zona Industriale Blocco Palma 1, str.le V.Lancia, 95121 Catania, Italy |
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| Abstract: | The catalytically oxidized olive mill wastewater (OMW) was subjected to continuous anaerobic treatment using two treatment schemes. The 1st step in both schemes was an up-flow anaerobic sludge blanket (UASB) reactor (2 0 l). The 2nd step was either a hybrid UASB reactor or a classical one (1 0 l, each). The 1st stage was operated at constant hydraulic retention time (HRT) of 24 h. The organic loading rate (OLR) varied from 3.4 to 4.8 kgCOD/m3 d depending on the quality of the pretreated wastewater. The results obtained indicated that, the 1st step UASB reactor achieved a COD percentage removal value of 53.9%. Corresponding total BOD5 and TSS removal were 51.5% and 68.3%, respectively.The results obtained indicated that the hybrid UASB reactor as a 2nd step produced better quality effluent as compared to the classical one. This could be attributed to the presence of the packing curtain sponge with active biomass in the sedimentation part of hybrid UASB reactor which minimizes suspended solids washout, consequently enhancement of the efficiency of the reactor.Available data showed that a two stage system consisting of a classical and a hybrid UASB reactor operated at a total HRT of 48 h and OLR of 2.0 kgCOD/m3 d provided promising results. Removal values of CODtotal, BOD5 total, TOC, VFA, oil and grease were 83%, 84%, 81%, 93% and 81%, respectively. Based on the available data, the use of a two stage anaerobic system consisting of a classical UASB reactor followed by a hybrid UASB as a post-treatment step for catalytically oxidized OMW is recommended. |
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