Traitement des margines par électrocoagulation avec des électrodes plates en aluminium

Abstract

Cet article est diffusé et préservé par Érudit. , la réduction des orthophosphates est 94-99 %, la réduction de l'ammonium est 80-85 %,la réduction du zinc -3 . Ces niveaux opérationnels optimaux permettent d'avoir une bonne dégradation des margines.Traitement des margines par électrocoagulation 474 est 70-75 %, la réduction du fer est 71-76 %, la masse perdue des électrodes est 0,6-0,7 kg•m -3 et l'énergie consommée est 12-14 kWh•mMots clés : Margine, caractérisation, électrocoagulation, électrodes en aluminium, décoloration, DCO, polyphénols. ABSTRACTOlive mill wastewater (OMWW) generated by the olive oil extraction process is the main waste product of this industry. These effluents have been characterized, followed by an experimental study of the elimination of organic matter (chemical oxygen demand (COD), phenolic compounds, suspended solids (SS) and colour), mineral matter (phosphate and ammonium nitrogen) and heavy metals (zinc and iron) using an electrocoagulation technique with aluminum electrodes. It was found that an increase in electrolysis time and voltage improved treatment significantly. However, a simultaneous increase in electrode and energy consumption was observed.The results of these analyses showed that the olive mill wastewater (OMWW) effluent, diluted five times, is acidic (pH 4.2), has a very high organic matter concentration , the reduction of orthophosphates was 94-99% and the reduction of ammonium was 80-85%. The reduction of zinc was 70-75%, the reduction of iron was 71-76%, the electrode consumption was 0.6-0.7 kg•m -3 and the amount of energy consumed was [12][13][14] . Under these optimal operational conditions, acceptable degradation of the OMWW was achieved.

Characterization of Two Olive Mill Wastewater and Its Effect on Fenugreek (<i>Trigonella foenum-graecum</i>) Germination and Seedling Growth

“…The orthophosphate concentration in both OMW types (29 mg/l) surpasses the values reported by [Bouknana et al, 2014] (ranging from 3.83 to 5.75 mg/l) and remains below the levels described by Ena et al, (2009) and Rajib et al, (2015) for OMW-CS, which were 926.3mg/l and 54mg/l respectively [Bouknana et al, 2014;Ena et al, 2009;Rajib et al, 2015]. It depends on climatic conditions and whether fertilizers are used or not [Hanafi et al, 2009]. However, polyphenol levels remain relatively low compared to those reported in the literature (0.1 to 17.…”

Effet de margines traitées par infiltration-percolation sur la germination et la croissance de quatre espèces végétales

“…Leur pH est de 5,9. Celle-ci est comparable aux valeurs comprises entre 4,2 et 5,9 trouvées par plusieurs auteurs (EROGLU et al, 2008;HANAFI et al, 2009;BOUKNANA et al, 2014;OUABOU et al, 2014;EL HERRADI et al, 2016 (2014).…”

Biodegradation of Toxic Compounds in Olive Mill Wastewater by a Newly Isolated Potent Strain: &lt;i&gt;Aspergillus niger&lt;/i&gt; van Tieghem

“…These values are 200 to 400 times higher than municipal water [2]. The major components in the colored fraction are substances of polymeric nature, derived from several low molecular weight phenolic compounds, chemically related to lignin and humic acids [3]. OMW phytotoxicity is essentially linked to its high phenolic compounds content that are the modified forms of phenols of the olive fruit [4].…”

“…OMW phytotoxicity is essentially linked to its high phenolic compounds content that are the modified forms of phenols of the olive fruit [4]. Because of its special characteristics, OMW treatment and valorization are serious problems for Mediterranean countries producing annually around 30 million·m 3 of OMW [4]. Many processes have been developed to treat this effluent: The currently employed systems for OMW treatment can be classified as biological, physicochemical, or combined processes.…”