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

JOURNAL OF CLEANER PRODUCTION

卷:135

Article

Maria Romero-Dondiz, Estela¹  Emilio Almazan, Jorge¹  Beatriz Rajal, Veronica¹  Fani Castro-Vidaurre, Elza¹ 

[1] Univ Nacl Salta, Fac Ingn, Inst Invest Ind Quim INIQUI CONICET, Av Bolivia 5150,A4408FVY Salta Capital, Salta, Argentina

关键词: Leather industry;    Wastewater treatment;    Tannin recovery;    Clean technology;    Membrane;   

DOI  :  10.1016/j.jclepro.2016.06.096

来源: Elsevier

【 摘 要 】

The tanning industries are characterized by generating large volumes of wastewater. The largest volume of effluents comes from the tanning stage and has a high concentration of tannins and a low ratio tannin/non-tannin (TINT). Membrane processes are appropriate technologies for treating these effluents. The aim of this study was to evaluate the performance of polymeric membranes in the treatment of exhausted vegetable tannin liquor from a tanning industry for its reuse. Different ultrafiltration (UF) and nanofiltration (NF) membranes were tested. Permeate flux decline, fouling resistances, fouling index, rejection for tannin (T) and non-tannin (NT) and increasing of the T/NT ratio in the retentate stream were evaluated. NF membranes had better characteristics than those of UF. The MPF-34 membrane showed the best separation properties with an increasing of the T/NT ratio from 1.68 to 1.80, for a volume reduction factor of 1.04. DK presented the best permeation properties and the lowest fouling, with an average permeate flux of 17.17 L/(m(2) h) and a fouling index (I-f) of 27.3%. The results were promising, so this clean technology could be implemented to minimize the negative environmental impact caused by tanning industry. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free