management and valorization of brines from desalination...
TRANSCRIPT
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Management and valorization of brines from
desalination plants in the Gulf
Dr. Philip Davies
Sustainable Environment Research Group,
Aston University, Birmingham, UK
Water and Energy Sustainable Innovation and Industry
University of Bahrain, 22-23rd April 2018
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Outline
Desalination: Challenge of brine disposal
Approaches to valorising brine
Water-energy-food nexus
Conclusions
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Deterioration in Gulf ecosystems
Salinity at highest level in 30 years
Correlates with Shatt Al-Arab river discharge
Diatom species decreased in coastal waters
(92 down from 243)
Less fish caughtSuboor Landings
year year
Salin
ity
Al-Said et al, Environ Monit Assess,
2017, 189-268
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Challenge of brine disposal
Desalination continues to grow
Water output now 100 million m3/day
Brine output equals/exceeds water output:
×1 to ×2 for RO plant
×3 to ×8 for thermal plant
Elevated:
Temperature (+1 to +10°C)
Salinity (up ×2)
No safe limit for concentration of brine not to disturb ocean biota*
co
nstr
uctio
nw
ee
konlin
e
*Falkenberg & Styan,
Desalination 368(2015)3-
Maalouf et al., Desalination 333(2014)134- www.panresearch.com
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Valorisation: what can we use brine for?
Nexus
LITHIUM for
ELECTRIC BATTERIES
REMOVAL of CO2
SPACE COOLING for
WATER EFFICIENT
CULTIVATION
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Valorisation: what can we use brine for?
Nexus
LITHIUM for
ELECTRIC BATTERIES
REMOVAL of CO2
SPACE COOLING for
WATER EFFICIENT
CULTIVATION
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Recovery of minerals from brine favoured by
high price and/or concentration
Concentration in seawater (mg/L)
Price (
US
D/k
g)
–2015 d
ata
Price increase
Increase concentration in seawater
Log
ana
tha
n e
t a
l., E
nv.
Sci –
Wa
ter
Re
s. &
Te
ch.,
2017
, 3, 37-5
3
Economically feasible
Economically
challenging
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Lithium price hike
2015
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Lithium price hike driven by battery demandLithiu
m d
em
and (
Li 2
CO
3)
kt
Electric
vehicles
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Estimated Li availability from Gulf desalination
Gulf plants estimated to treat ~100 million m3 of seawater/day
@ 0.17 g/m3 and 50% recovery of Li⟶ 3000 tonnes Li per year
Compare world production 36 000 tonnes in 2015 (USGS)
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Technologies to recover Li from seawater
Li adsorbed on MnO ion-
exchange resins, eluted by HCl
Resin prepared as granules
(mm size)
Slow process: requires large
amounts of resin for sufficient
residence time
150 days cycle time
~30 min residence time
Nishihama et al., Solvent Extraction and Ion Exchange,
29, 421- (2011)
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Technologies to recover Li - membranes
Electrospun polysulphone mixed-matrix nanofibre dispersed
with particulate Li ion sieves
Residence time only ~2 min, faster cycle time ~ 12 h
Repeated eluted with HCl to increase Li concentration
Park et al, J. Membrane Science, 510 (2016) 141-
Cycle numberC
(m
g L
i+ L
-1)
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Valorisation: what can we use brine for?
Nexus
LITHIUM for
ELECTRIC BATTERIES
REMOVAL of CO2
SPACE COOLING for
WATER EFFICIENT
CULTIVATION
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Remove CO2 and neutralise ocean acidity
Oceans getting more acidic because of CO2
Magnesium in brine can absorb CO2
1 m3 of seawater can absorb up to 4.8 kg of CO2
Reactions:
MgCl2 (aq) + 2H2O (l) → Mg(OH)2 (s) + 2HCl (aq)
Mg(OH)2 (s) + 2CO2(g) → Mg(HCO3)2 (aq)
RO plantBrine
treatment
1 m3
seawater
0.75 kg CO24.8 kg CO2
Mg(OH)2
OCEANS
• Absorb CO2
• Neutralise acidity
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Anion exchange
membrane
Gas diffusion
anode
H. Xie, Y. Wang, W. Chu, Chinese Science Bulletin, 59 (2014) 2882-2889
VE o 50.0
Formation of magnesium hydroxide
eHClClH 2222 eHClClH 2222
Electrolysis to yield Mg(OH)2
Prototype at
Aston University
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Electrolysis in flow-through mode
Freshwater
inputBrine from desal plant
Brine enriched with Mg(OH)2 to
ocean
Hydrochloric acid for
geological disposal
Electrical power input
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Davies, Yuan, de Richter, Env. Science: Water Research and Technology – in press
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Negative emissions from desalination
-10
-8
-6
-4
-2
0
2
4
6
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2
kg
CO
2e
mis
sio
n p
er
m3
ou
tpu
t
Carbon intensity kgCO2/kWh
With electrolysisGas Coal
Without electrolysis
Carbon intensity of
electricity kgCO2/kWh
kgC
O2
em
issio
ns p
er
m3
of w
ate
r out
RO plant powered by natural gas power plant absorbs 2.3 × amount of CO2 emitted.
Davies, Yuan, de Richter, Env. Science: Water Research and Technology – in press
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Specific energy
consumption
SEC increased by
electrolysis process
Recovery ratio
around 0.7
minimises SEC
0
2
4
6
8
10
12
14
16
18
-8
-6
-4
-2
0
2
4
6
8
10
0 0.2 0.4 0.6 0.8 1
Ene
rgy
pe
nal
ty G
J/tC
O2
Ne
t CO
2e
mit
ted
pe
r m3
of f
resh
wat
er o
utp
ut (
kg/m
3 )
or
SEC
kW
h/m
3
Recovery ratio, r
SEC
Net CO2
Energy penalty
Recovery ratio r
SEC
Net CO2
Energy
penalty
Davies, Yuan, de Richter, Env. Science: Water Research and Technology – in press
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Valorisation: what can we use brine for?
Nexus
LITHIUM for
ELECTRIC BATTERIES
REMOVAL of CO2
SPACE COOLING for
WATER EFFICIENT
CULTIVATION
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Seawater Greenhouse
Brine is used to cool a greenhouse for crop production
Demonstrated in: Tenerife, UAE, Oman, Australia and Somaliland
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Seawater Greenhouse: Somaliland, 2017
Desalination by Reverse Osmosis (RO) + photovoltaics
Wind ventilation
Low cost 1000 m2 shade net
Reject brine for cooling then salt production
Salt NaCl
Bitterns MgCl2
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Evaporative cooling pad Cucumbers
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Seawater Greenhouse: modelling & design
Summary findings:
Modelling using Computational Fluid Dynamics
8-58% reduction in land usage for brine disposal vs. evaporation ponds
Cool air 10-15 m downstream of pad
Validation against satellite data
Akinaga et al, Desalination 426(2018)135-
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Key conclusions
Nexus
LITHIUM for
ELECTRIC BATTERIES
REMOVAL of CO2
SPACE COOLING for
WATER EFFICIENT
CULTIVATION
DESALINATION
Brines mostly
dumped today
– harmful not
valuable
Increasingly promising –
membrane recovery
Negative emissons
but high SEC
Seawater Greenhouse:
Innovative approach for water
saving and improved food
security in arid countries.
High-recovery desalination complementary to brine valorisation
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Acknowledgements
Innovate-UK and Department for International Development
(Agri-Tech Catalyst Programme)
Seawater Greenhouse Ltd
University of Bahrain
Thank you for listening!