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Journal of Environmental Waste Management and Recycling | Volume 1
March 05-06, 2018 | London, UK
Recycling & Waste Management
5
th
International Conference on
Valorisation of industrial brines into value-added products (acids and bases) through selectrodialysis
and bipolar membrane electrodialysis: A step towards circular economy approach
Oriol Gibert
1,2
, Mònica Reig
1,2
, César Valderrama
1
, José Luis Cortina
1,2
1
Universitat Politècnica de Catalunya, Spain
2
CETaqua, Spain
H
igh salinity waste water effluents originated from
different industrial processes are normally considered
as last-resort sources because their high contents of ions
make necessary the use of complex and costly treatment
systems. For this reason, generated brines have traditionally
been discharged into natural water bodies, although this
method is not environmentally friendly and represents a loss
of potential resources (salts and water). Undoubtedly the
selective recovery and revalorisation of salts contained in
brines would permit their reusability as well as a reduction
of the environmental impact caused by their disposal,
contributing to the development of circular economy.
Within this framework, the present study intended to
treat an industrial brine rich in NaCl and Na
2
SO
4
through a
combination of membrane-based technologies to convert
its ions into valuable chemical products. The involved
technologies consisted in 1) electrodialysis (SED) to separate
NaCl from Na
2
SO
4
, and 2) electrodyalisis with bipolar
membranes (EDBM) to produceHCl andNaOH fromNaCl, and
H
2
SO
4
and NaOH from Na
2
SO
4
. Experiments were performed
under different Cl- and SO
4
2-
concentrations in feed solution
and carrier solutions to be enriched in Cl- and SO
4
2-
. Results
indicated that it was possible to separate Cl− and SO
4
2−
by
SED (purities up to 98%) and to produce pure NaOH and HCl
and H
2
SO
4
by EDBM. Optimal operation conditions were also
determined with regard to energy consumption.
Speaker Biography
Oriol Gibert is an environmental chemist at Technical University of Catalonia (UPC) with
more than 10 year’s experience in the field of contaminated land and groundwater and
of process separation (adsorption, membranes) applied to water treatment. He has 50
ISI-indexed publications and his publication H-index is 18.
e:
oriol.gibert@upc.edu