Kinetics and boundary flux optimization of integrated photocatalysis and ultrafiltration process for two-phase vegetation and olive washing wastewaters treatment

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[1] Ochando-Pulido, J.M.
[2] Stoller, M.
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Ochando-Pulido, J.M. | 1600年 / Elsevier B.V., Netherlands卷 / 279期
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In many of the studies available on the treatment or fractionation by membrane technology of the effluents by-produced by olive oil factories; the problem of fouling is not correctly approached or not even addressed. In the present study; the operating framework of a spiral wound polymeric ultrafiltration (UF) membrane module was optimized by the boundary flux theory; which merges both the critical and threshold flux theories for simplification purpose and was formerly validated by the Authors. The raw wastewater; a mixture of olive washing and olive vegetation wastewaters; was pretreated by two processes developed in prior research: pH-temperature flocculation (pH-T F) and photocatalysis with lab-made ferromagnetic-core titanium dioxide nanoparticles under ultraviolet light (UV/TiO2 PC). The organic matter removal during UV/TiO2 PC fitted accurately a two-step first-order kinetic model. Also; the proposed boundary model fits the membrane experimental data with accuracy. Higher boundary flux values were confirmed for batch UF when the feedstream is further pretreated by UV/TiO2 PC (23.3-23.6% increment); and also slightly higher feed recovery and significant minor sub-boundary fouling index α. Moreover; the higher rejection of the organic pollutants (53.3%) permits achieving the standard limits to reutilize the purified effluent for irrigation purposes. © 2015 Elsevier B.V;
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