Removal of vegetable tannins to recover water in the leather industry by ultrafiltration polymeric membranes

Comparison of the performance of ultrafiltration and nanofiltration membranes for recovery and recycle of tannins in the leather industry

“…These results confirmed that the OT050 membrane had a greater level of fouling due to its higher MWCO, structure, porosity and hydrophobicity of the membrane material favoring the adsorption of organic matter inside the membrane and on its surface (Koo et al, 2012). A similar behavior was observed in preliminary tests conducted by this research group (Romero-Dondiz et al, 2015) using the same membranes, but a synthetic solution feed. Table 4 Fouling index (I f ) and water permeability of UF and NF membrane before the treatment of wastewater (L pi ) and after the membrane cleaning (L pf ) for the same accumulated volume of permeate (185 mL).…”

“…According to the literature, membrane processes driven by a pressure gradient: microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO), have been used for wastewater treatment of leather industry for the separation, purification, and recovery and reuse of chemicals products and water (Brites Alves and Norberta de Pinho, 2000;Fababuj-Roger et al, 2007;Romero-Dondiz et al, 2015). The results showed that it is feasible to recover the chemicals; however, the efficiency of the process depends on the M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 5 type of membrane used and the operating conditions of the system.…”

Fungi from industrial tannins: potential application in biotransformation and bioremediation of tannery wastewaters

“…Moreover, filamentous fungi capable of degrading tannins could have a strong environmental impact as bioremediation agents. Tannins are indeed one of the major components of tannery, which may ultimately cause serious environmental pollution (Cassano et al 2003;Romero-Dondiz et al 2015), having for instance cytotoxic effects in Australian parakeets (de Souza et al 2017). However, biodegradation of tannins is in an incipient stage and further studies have to be carried out to exploit the potential for large-scale application in food, fodder, medicine, and tannery effluent treatment (Aguilera-Carbo et al 2008;Govindarajan et al 2016).…”

Studies on enhancing the biodegradation of tannins by ozonation and Fenton's oxidation process

“…Removal of vegetable tannins to recover water in the leather industry by ultrafiltration polymeric membranes was investigated and reported 83% of tannin retention and a recovery of the water flux of 41-45% after cleaning the membrane [6]. To deal with wastewater that contains soluble organic compounds that are either toxic or non-biodegradable, application of various oxidation technologies were tried to mineralize or reduce the toxicity of the compounds.…”