Augmentation of biodegradability of olive mill wastewater by electrochemical pre-treatment: Effect on phytotoxicity and operating cost

Hanafi, F.; Belaoufi, A.; Mountadar, M.; Assobhei, Omar

doi:10.1016/j.jhazmat.2011.02.087

Cited by 40 publications

(12 citation statements)

References 35 publications

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“…Some constituents such as tannins, polyalcohols, lipids and phenolic compounds are toxic or recalcitrant, thus rendering the development of alternative treatments to reduce the environmental impact of OMW in natural waters an urgent issue. Many physicochemical treatments, such as ozonation, coagulation, ultrafiltration, electrochemical oxidation, and biological process, using fungi and bacteria were developed and applied for the decolorization, degradation of organic compounds and removal of chemical oxygen demand (COD) from OMW (Mantzavinos and Kalogerakis 2005;Borja et al 2006;Roig et al 2006;McNamara et al 2008;Morillo et al 2009;Cassano et al 2011;Hanafi et al 2011;Michailides et al 2011;Nieto et al 2011,;Oller et al 2011;Scoma et al 2011;Justino et al 2012). Aerobic biological treatments such as activated sludge appeared to be very effective against some low molecular mass phenolic compounds but are relatively ineffective against the more complex polyphenolics responsible for the dark colouration of OMW (McNamara et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites

Duarte

Justino

Panteleitchouk

et al. 2013

Int. J. Environ. Sci. Technol.

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This study aims to attempt a treatment strategy based on fungi immobilized on silica-alginate (biocomposites) for removal of phenolic compounds in olive oil mill wastewater (OMW), OMW supplemented (OMWS) with phenolic compounds and water supplemented (WS) with phenolic compounds, thus decreasing its potential impact in the receiving waters. Active (alive) or inactive (death by sterilization) Pleurotus sajor caju was encapsulated in alginate beads. Five beads containing active and inactive fungus were placed in a mold and filled with silica hydrogel (biocomposites). The biocomposites were added to batch reactors containing the OMW, OMWS and WS. The treatment of OMW, OMWS and WS by active and inactive biocomposites was performed throughout 28 days at 25°C. The efficiency of treatment was evaluated by measuring the removal of targeted organic compounds, chemical oxygen demand (COD) and relative absorbance ratio along the time. Active P. sajor caju biocomposites were able to remove 64.6-88.4 % of phenolic compounds from OMW and OMWS and 91.8-97.5 % in water. Furthermore, in the case of OMW there was also a removal of 30.0-38.1 % of fatty acids, 68.7 % of the sterol and 35 % of COD. The silica-alginate-fungi biocomposites showed a high removal of phenolic compounds from OMW and water. Furthermore, in the application of biocomposites to the treatment of OMW it was observed also a decrease on the concentration of fatty acids and sterols as well as a reduction on the COD.

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Section: Introductionmentioning

confidence: 99%

Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites

Duarte

Justino

Panteleitchouk

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Therefore, if additional electric charges are supplied to the charged particles via appropriate electrodes, the surface charge of the particles is neutralized and several particles combine into larger and separable agglomerates [15]. Coupling different coagulants with biological processes has received a lot of attention in recent years as a promising treatment alternative for effluents that are too toxic to be treated biologically [16].…”

Section: Introductionmentioning

confidence: 99%

Improvement of biological process using biocoagulation–flocculation pretreatment aid in olive mill wastewater detoxification

Neffa¹,

Hanine

Lekhlif

et al. 2013

Desalination and Water Treatment

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Olive mill wastewaters (OMWW) are a significant source of potential or existing environmental pollution in the Mediterranean countries. Treatment and reuse of OMWW present significant challenges, both due to the nature of olive oil production (seasonal and concentration in a small scale) and due to the characteristics of the wastewater (high chemical oxygen demand (COD) and high phenolic content). In the present work, experiments of different pretreatment methods were undertaken and compared in order to select the most adequate process to be applied before biological treatment of OMWW. In fact, three different pretreatments were tested and compared: two different coagulants (alginate and Kim2120) and electrocoagulation (EC) process. At the second stage, biological treatment (using whiterot fungus) was investigated. Tests were conducted with raw OMWW and with OMWW diluted in 50% tap water and adjusted to a neutral pH with lime. The raw effluent presents high COD (178 g O 2 l À1 ), about 6.4 g l À1 of total suspended solids (TSS), a high conductivity (29 mS cm À1 ), acidic pH 4.8, and turbidity of 90 NTU. Results show that after 90 min of EC process, using 15 V/m 2 voltage, a maximum of 49% of organic matter removals was achieved. The optimum removals of COD and turbidity obtained were 39 and 75%, respectively when 20 mg l À1 dose of alginate is used, especially at pH 7. Coagulation using Kim2120 at 10 mg l À1 applied on diluted OMWW showed reduction reaching 52.3% of COD and 85% of turbidity. The maximum removal of total polyphenols, tyrosol and hydroxytyrosol obtained were 60.1, 23.1, and 59.1% with lime/alginate and 64.2, 67.8, and 76.3% with lime/kim2120, respectively. Only 57% of polyphenols was removed by EC. The pretreated effluents by different physicochemical processes tested showed that the best yields were obtained with lime/kim2120. The pretreated olive mill wastewater was then treated *Corresponding author.

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“…This was most likely a result of the activity of A. niger. Indeed, previous works showed that this fungus is known for the production of acid metabolite products [20]. At the end of treatment the pH values was 6.23.…”

Section: Biodegradation Of Omw With Aspergillus Niger Van Tieghemmentioning

confidence: 90%

Biodegradation of Toxic Compounds in Olive Mill Wastewater by a Newly Isolated Potent Strain: <i>Aspergillus niger</i> van Tieghem

Hanafi¹,

Mountadar²,

Etahiri³

et al. 2013

JWARP

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Thirty-two strains isolated from olive oil production plants were screened for their tolerance to the polyphenols and their ability to grow in olive oil mill wastewaters (OMW). An Ascomycete isolate that grew best on OMW was selected for further study to evaluate its effect on removal of organic pollutants, phenolic compounds and OMW toxicity. This strain was identified by DSMZ as Aspergillus niger van Tieghem. The growth of Aspergillus niger van Tieghem on stored OMW decreased pH and led to the reduction of phenolic compounds with a resultant discoloration of OMW and significant reduction of chemical oxygen demand (COD), in proportion to the dilution of OMW. The reduction of the COD, phenolics and color exceeded 50%. Tannase, the enzyme detected in the growth medium of Aspergillus niger van Tieghem was produced during primary metabolic growth. The maximal enzyme activity attaining 0.68 EU/ml was achieved in 3rd days of cultivation. The phytotoxicity of the stored OMW was reduced to about 40% after 4 days' incubation with Aspergillus niger van Tieghem.

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Augmentation of biodegradability of olive mill wastewater by electrochemical pre-treatment: Effect on phytotoxicity and operating cost

Cited by 40 publications

References 35 publications

Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites

Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites

Improvement of biological process using biocoagulation–flocculation pretreatment aid in olive mill wastewater detoxification

Biodegradation of Toxic Compounds in Olive Mill Wastewater by a Newly Isolated Potent Strain: <i>Aspergillus niger</i> van Tieghem

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Augmentation of biodegradability of olive mill wastewater by electrochemical pre-treatment: Effect on phytotoxicity and operating cost

Cited by 40 publications

References 35 publications

Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites

Removal of phenolic compounds in olive mill wastewater by silica–alginate–fungi biocomposites

Improvement of biological process using biocoagulation–flocculation pretreatment aid in olive mill wastewater detoxification

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

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Biodegradation of Toxic Compounds in Olive Mill Wastewater by a Newly Isolated Potent Strain: <i>Aspergillus niger</i> van Tieghem