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Remediation of direct blue 71 wastewater by salting out processes using
inorganic salt solutions and seawater
Journal of Environment & Biotechnology Research, Vol. 6, No. 1, Pages 53-57, January 2017
Muhammad Raziq Rahimi Kooh, Muhammad Khairud Dahri, Linda B. L. Lim, Lee Hoon Lim
ABSTRACT
This study investigates an alternative simple low-cost method of removing a hazardous dye, direct blue 71 (DB71),
by changing the ionic strength of the aqueous solution (salting-out) via addition of various salt solutions of
different concentrations as well as using seawater. This led to formation of dye aggregations which can be
filtered. Investigation with inorganic salts revealed high removal efficiency with 0.6 M monovalent salts (KNO3, KCl
and NaCl), while for divalent salts (Mg(NO3)2 and CaCl2) only 0.001 M was required. High removal efficiency of 93%
was achieved with 40x diluted seawater. Scanning electron microscopy reveals thread-like structure of the
aggregated DB71.
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Journal of Environment and Biotechnology Research
Volume 6, Number 1, 2017, pp. 53-57
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