Integrated direct contact membrane distillation for olive mill wastewater treatment



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El-Abbassi, A. and Hafidi, A. and Khayet Souhaimi, Mohamed and García Payo, María del Carmen (2013) Integrated direct contact membrane distillation for olive mill wastewater treatment. Desalination, 323 . pp. 31-38. ISSN 0011-9164

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Direct contact membrane distillation (DCMD) process was applied for olive mill wastewater (OMW) treatment and its concentration using a commercial flat-sheet polytetrafluoroethylene membrane (TF200, Gelman) with 0.2 mu m mean pore size. The effects of the mean temperature and temperature difference on the DCMD permeate flux were studied. Two pre-treatment processes, coagulation/flocculation and microfiltration (MF), were considered and the effects of each one on the DCMD performance were investigated. MF was found to be the optimum pre-treatment to be integrated to DCMD for OMW. When the permeate temperature was kept constant at 20 degrees C, the DCMD permeate flux increased with the increase of the feed temperature. However, the permeate flux decreased with the feed phenol concentration of OMW. The concentration factor of each phenolic compound varied from 1.56 to 2.93. The main phenolic compound in the tested OMW samples was found to be the hydroxytyrosol, which was concentrated more than two times from 4.01 g/L to 8.16 g/L after 40 h of OMW processing by DCMD. The membrane fouling phenomenon was also studied. Results showed that the integrated MF/DCMD can be an effective process for the treatment and concentration of OMW obtaining clean water and a phenolic-rich concentrate.

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© 2012 Elsevier B.V. The authors gratefully acknowledge the financial support of AECI (Agencia Espanola de Cooperacion Internacional, Ministerio de Asuntos Exteriores y de Cooperacion) through the projects A/023127/09 and A/032278/10.

Uncontrolled Keywords:Phenolic-compounds; Anaerobic-digestion; Polyphenols; Wastewaters; Fractionation; Recovery; System; Decolourization; Antioxidants; Removal
Subjects:Sciences > Physics > Thermodynamics
ID Code:25794
Deposited On:13 Jun 2014 12:22
Last Modified:14 Mar 2016 15:10

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