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Integrated ultrafiltration-nanofiltration membrane processes applied to the treatment of gold mining effluent: Influence of feed pH and temperature

2016; Taylor & Francis; Volume: 52; Issue: 4 Linguagem: Inglês

10.1080/01496395.2016.1262419

1520-5754

Laura Hamdan de Andrade, Alice Aguiar, Wadson L. Pires, Gisele Alves Miranda, Míriam Cristina Santos Amaral,

Mine drainage and remediation techniques

This study aimed to evaluate the effect of feed pH (2.2 - original effluent pH – up to 6.0) and temperature (20 up to 40°C) on the performance of integrated ultrafiltration (UF) and nanofiltration (NF) applied to gold mining effluent. pH increase led to a significant decrease in UF permeate flux. NF showed high retention efficiencies of ions when temperature was below 30°C. Retention of high-valence counter-ions to balance the charge of retained co-ions seemed to be the strongest NF mechanisms. Process performance at feed pH of 5.0 was superior in terms of fouling, retention efficiency, and investment cost.