Use of activated clays in the removal of dyes and surfactants from tannery waste waters

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作者：

A.G. Espantaleon，J.A. Nieto，M. Fernandez，A Marsal

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摘要：

A method is tested to reduce the pollution of effluents produced in the hide transformation process. Adsorption processes with clays could constitute a simple, selective and economical alternative to conventional physical–chemical treatments. The adsorption capacity of natural and acid-activated bentonite and sepiolite for anionic dyes normally used in the tannery was compared with that of a conventional adsorbent such as activated carbon. Natural bentonite with a different level of acid activation was used to adsorb a non-ionic surfactant such as nonylphenol ethoxylated with 8 mol of ethylene oxide. The capacity of sepiolite and acid-activated bentonite to adsorb anionic dyes normally used in the tannery was much greater than that of conventional adsorbents. A surfactant removal of 90% was achieved in approximately 10 min because of the high affinity between surfactant and adsorbent. Natural bentonite activated with 0.5 M H 2SO 4 was the most effective adsorbent for ethoxylated nonylphenol.

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关键词：

adsorption clays dyes non-ionic surfactant tannery

DOI：

10.1016/S0169-1317(03)00153-4

被引量：

271

年份：

2003