The adsorption of phenolic compounds from olive mill wastewater (OMW) has been investigated as a ... more The adsorption of phenolic compounds from olive mill wastewater (OMW) has been investigated as a function of adsorbent dose, pH and contact time. The results showed that the increase in the banana peel dosage from 10 to 30 g/L significantly increased the phenolic compound adsorption rates from 60 to 88%. Increase in the pH above neutrality resulted in the increase in the phenolic compound adsorption capacity. The adsorption process was fast, and it reached equilibrium in 3h contact time. The equilibrium process was described well by the Langmuir and Freundlich isotherm models with maximum sorption capacity of 688.9 mg/g of phenolic compounds on banana peel at 30°C. Banana peel, an inexpensive and easily available material, can be an alternative to more costly adsorbents used for the removal of phenolic compounds from olive mill wastewater (OMW).
Olive mill wastewater (OMW) is the main pollutant from olive oil production by three-phase system... more Olive mill wastewater (OMW) is the main pollutant from olive oil production by three-phase systems and traditional mills. It is constituted by vegetable water of the fruit and the water used in different stages of oil extraction. Many management strategies such as advance oxidation processes, microfiltration, ultrafiltration, nanofiltration, reverse osmosis, anaerobic biodegradation and adsorption have been proposed for the treatment and valorization of OMW. Most of these methods aim to the reduction of the phytotoxicity of OMW effluents, which is due mainly to their high load of polyphenolic compounds, in order to reuse them for agricultural purposes. However, only recently, in relation to the major interest for the natural compounds with biological activities, researches have began to consider polyphenols recovery, as high value compounds, transforming OMW from effluents to raw material with high potential economic value. In this study, the possibility to treat and concentrate OMW...
Table olive processing wastewaters (TOPW) can cause important local environmental problems. They ... more Table olive processing wastewaters (TOPW) can cause important local environmental problems. They are characterized by seasonal peaks, very high organic load and high concentrations of phenolic compounds, which are known to cause toxic effects to living organisms. In Mediterranean countries, this type of wastewater is usually discharged untreated increasing the risk of polluting surface or ground waters. The aim of this work is the reduction of the pollution caused by table olive wastewater (TOWW) using membrane separation. A magnetic stirred unit and PES membranes of 50,000 Da (MWCO) were used. The transmembrane pressure and stirring rate were 3 bars and 250 rpm, respectively. The effectiveness of the different membranes and operating conditions was evaluated using retention coefficients of: COD, Color, Dry Residue and TPC. The effects of pH on permeate fluxes and the efficiency of separation were evaluated. The highest permeate flux (50.5 1/h.m²) was obtained at pH 8. Efficient rem...
The ultrafiltration process was applied to the treatment of Olive Mill Wastewater (OMW), the main... more The ultrafiltration process was applied to the treatment of Olive Mill Wastewater (OMW), the main pollutant of olive oil production. Magnetic stirred unit and PES membrane of 50,000 Da (MWCO) were used. The transmembrane pressure and stirring rate were 3 bar and 250 rpm, respectively. The effectiveness of the different membranes and operating conditions was evaluated using retention coefficients of : COD, Color, Dry Residue and TPC. The effects of pH on permeate fluxes and depollution of the OMW were evaluated. The highest permeate flux (29.2 l/h.m²) was obtained at pH 2, while the highest removals of COD (59.7%), Color (86.9%), Dry Residue (36.8%) and TPC (30.2%) were obtained at pH 2, pH 4, pH 6 and pH 12 respectively. The adjustment of olive mill wastewater to alkaline pH, prior to ultrafiltration, has affected the permeate fluxes. The lowest flux was registered at pH 8 (4.5 l/h.m²). The obtained results show that the ultrafiltration can be used as pretreatment at acid pH values....
The adsorption of phenolic compounds from olive mill wastewater (OMW) has been investigated as a ... more The adsorption of phenolic compounds from olive mill wastewater (OMW) has been investigated as a function of adsorbent dose, pH and contact time. The results showed that the increase in the banana peel dosage from 10 to 30 g/L significantly increased the phenolic compound adsorption rates from 60 to 88%. Increase in the pH above neutrality resulted in the increase in the phenolic compound adsorption capacity. The adsorption process was fast, and it reached equilibrium in 3h contact time. The equilibrium process was described well by the Langmuir and Freundlich isotherm models with maximum sorption capacity of 688.9 mg/g of phenolic compounds on banana peel at 30°C. Banana peel, an inexpensive and easily available material, can be an alternative to more costly adsorbents used for the removal of phenolic compounds from olive mill wastewater (OMW).
Olive mill wastewater (OMW) is the main pollutant from olive oil production by three-phase system... more Olive mill wastewater (OMW) is the main pollutant from olive oil production by three-phase systems and traditional mills. It is constituted by vegetable water of the fruit and the water used in different stages of oil extraction. Many management strategies such as advance oxidation processes, microfiltration, ultrafiltration, nanofiltration, reverse osmosis, anaerobic biodegradation and adsorption have been proposed for the treatment and valorization of OMW. Most of these methods aim to the reduction of the phytotoxicity of OMW effluents, which is due mainly to their high load of polyphenolic compounds, in order to reuse them for agricultural purposes. However, only recently, in relation to the major interest for the natural compounds with biological activities, researches have began to consider polyphenols recovery, as high value compounds, transforming OMW from effluents to raw material with high potential economic value. In this study, the possibility to treat and concentrate OMW...
Table olive processing wastewaters (TOPW) can cause important local environmental problems. They ... more Table olive processing wastewaters (TOPW) can cause important local environmental problems. They are characterized by seasonal peaks, very high organic load and high concentrations of phenolic compounds, which are known to cause toxic effects to living organisms. In Mediterranean countries, this type of wastewater is usually discharged untreated increasing the risk of polluting surface or ground waters. The aim of this work is the reduction of the pollution caused by table olive wastewater (TOWW) using membrane separation. A magnetic stirred unit and PES membranes of 50,000 Da (MWCO) were used. The transmembrane pressure and stirring rate were 3 bars and 250 rpm, respectively. The effectiveness of the different membranes and operating conditions was evaluated using retention coefficients of: COD, Color, Dry Residue and TPC. The effects of pH on permeate fluxes and the efficiency of separation were evaluated. The highest permeate flux (50.5 1/h.m²) was obtained at pH 8. Efficient rem...
The ultrafiltration process was applied to the treatment of Olive Mill Wastewater (OMW), the main... more The ultrafiltration process was applied to the treatment of Olive Mill Wastewater (OMW), the main pollutant of olive oil production. Magnetic stirred unit and PES membrane of 50,000 Da (MWCO) were used. The transmembrane pressure and stirring rate were 3 bar and 250 rpm, respectively. The effectiveness of the different membranes and operating conditions was evaluated using retention coefficients of : COD, Color, Dry Residue and TPC. The effects of pH on permeate fluxes and depollution of the OMW were evaluated. The highest permeate flux (29.2 l/h.m²) was obtained at pH 2, while the highest removals of COD (59.7%), Color (86.9%), Dry Residue (36.8%) and TPC (30.2%) were obtained at pH 2, pH 4, pH 6 and pH 12 respectively. The adjustment of olive mill wastewater to alkaline pH, prior to ultrafiltration, has affected the permeate fluxes. The lowest flux was registered at pH 8 (4.5 l/h.m²). The obtained results show that the ultrafiltration can be used as pretreatment at acid pH values....
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