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Recovery and reuse of chromium from tannery wastewaters using Turbinaria ornata seaweed
Author(s) -
Aravindhan Rathinam,
Madhan Balaraman,
Rao Jonnalagadda Raghava,
Nair Balachandran Unni
Publication year - 2004
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1119
Subject(s) - chromium , freundlich equation , biosorption , chemistry , sulfate , chloride , sulfuric acid , magnesium , nuclear chemistry , wastewater , langmuir , adsorption , environmental chemistry , pulp and paper industry , environmental engineering , inorganic chemistry , sorption , environmental science , organic chemistry , engineering
Brown seaweed ( Turbinaria spp) was pre‐treated with sulfuric acid, calcium chloride and magnesium chloride and tested for its ability to remove chromium from tannery wastewater. Protonated seaweeds gave better uptake of chromium compared with calcium and magnesium treatments. Chromium uptake was optimal at pH 3.5. Turbinaria weed exhibited maximum uptake of about 31 mg of chromium for one gram of seaweed at an initial concentration of 1000 ppm of chromium. Freundlich and Langmuir adsorption isotherm models were used to describe the biosorption of chromium(III) by Turbinaria spp. The chromium‐loaded seaweed was reused as a reductant in the preparation of the tanning agent basic chromium sulfate (BCS). Leathers made from this tanning agent had properties comparable to conventionally processed chrome‐tanned leathers. Copyright © 2004 Society of Chemical Industry