[Treatment of olive mill wastewater by a process combining an intensive treatment (Jet-Loop reactor) followed by an extensive treatment (stabilization ponds)].
Olive oil mill wastewater (OMW) is generally recognized as an environmentally troublesome by-product of the olive oil industry as its disposal without any treatment is known to cause serious environmental problems. However, this effluent has a high fertilizing power and constitutes, with urban wastewater, an important low-cost source. Biological treatment of OMW, with a process combining an aerobic reactor, 'Jet-Loop', and waste stabilization ponds, was investigated for possible agricultural reuse. The focus of the present study was to evaluate the contribution and the complementarity of the two systems in the total OMW treatment. Bio-treatment was performed using a 100-litre Jet-Loop reactor working volume achieving a chemical oxygen demand (COD) and phenolic compounds maximum removal rate of 72% and 68%, respectively, at a hydraulic retention time of 10 days. Co-treatment of OMW and domestic wastewater in waste stabilization ponds, with a hydraulic retention time of 22 days, reached a global removal rate of 66% for COD while no trace of phenolic compounds was detected on this level during the entire treatment period. Dynamics of faecal coliforms in stabilization ponds showed a total removal rate of 99.9% (3 logarithmic units (Log.U)). Preliminary results of agronomic tests on the ray-grass have evaluated the fertilizing effect of the final effluent resulting from the co-treatment.
Jail
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Laboratoire de Biologie et Biotechnologie des Microorganismes, Pôle d'Excellence Régionale AUF, Faculté des Sciences Semlalia, Université Cadi Ayyad, Marrakech, Maroc.
Boukhoubza
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F
Nejmeddine
A
A
Duarte
J C
JC
Sayadi
S
S
Hassani
L
L
D000383:Agriculture / Q000379:methods; D001420:Bacteria, Aerobic / Q000737:chemistry; D001673:Biodegradation, Environmental; D019149:Bioreactors; D004867:Equipment Design; D007220:Industrial Waste; D031658:Olea / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D019800:Phenol / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods
D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D019800:Phenol; D010100:Oxygen