Nickel behavior of olivine. As presented by Joshi Lenferink at the AGU Fall Meeting.

1. •AGU Fall meeting
•Titel: GC43G-1611
Olivine weathering, the release of
Nickel and practical implications for
CO2 sequestration
•Date: Thursday, 13 December 2018
•Locatie: Washington DS
•Authors: Joshi Lenferink
Pol Knops

2. Shrink
More information:
Jos.vink@deltares.nl
Joshilenferink@gmail.com
Planbco2@gmail.com
Joshi Lenferinka, Jos Vinka, Pol Knopsb
Olivine weathering, Nickel release and practical implications
for CO2 sequestration
Olivine is one of the most common silicate minerals in the Earth’s
surface. Its capability to bind CO2 and convert it into (bi)carbonate
makes it a powerful and natural means of capturing greenhouse
gas from the atmosphere.
Deltares and Green Minerals developed a model to calculate the
weathering rate of olivine (as a function of time, pH, grainsize and
dosage), cumulative sequestration of CO2 and release of Ni into
the environment based on the speciation and application.
According to Dutch regulations:
- Civil uses is allowed
- Agricultural use (more sensitive to Nickel) exceeds the
regulation only for very fine olivine in the first month of dosage.
Thus, this model shows that olivine can be used for both civil and
agricultural applications.
Weathering of olivine
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 10 20 30 40 50 60 70 80 90 100 110
Olivinedissolved(%)
Time (year)
Olivine dissolved
0
100000
200000
300000
400000
500000
600000
700000
800000
900000
1000000
0 10 20 30 40 50 60 70 80 90 100110
CO2sequestred(kg)
Time (year)
CO2 sequestred
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
0 50 100 150
Mgreleased(g/m2/yr)
Time (year)
Mg released
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
0 50 100 150
Mgreleased(mg/m2/yr)
Time (year)
Ni released
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Potatoe
Carrot
Tomatoe
Red&Whitecabbage
Cauliflower
Cabbage
Beans
Creepingbentgrass
Foxtail
Catgrass
Couchgrass
Tallfescue
Ryegrass
Reedcanarygrass
Commonreed
Annualmeadowgrass
Bluegrass
Cat'stail
Redclover
Whiteclover
Vetch
Creepingthistle
Watermint
Ribwortplantain
Broadleafplantain
Silverweed
Creepingcinquefoil
Creepingbuttercup
Yellowcress
Creepingyellowcress
Bitterdock
Elderberry
Charlockmustard
Whitewillow
Basketwillow
Wheat
Barley
Onion
Greenpepper
Ethiopiankale
Swisschard
Pumpkin
Niconcentration[ug/kg]
Ni concentration in different plants over time [years]
0,2
0,5
1
10
50
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
0.05 0.15 0.25 0.35 0.45 0.75 2 4 6 8 10 15 25 35 45
RCR
Duration [years]
RCR over time
0.00
10.00
20.00
30.00
40.00
50.00
60.00
0.05 0.15 0.25 0.35 0.45 0.75 2 4 6 8 10 15 25 35 45
Niinsolution[ug/L]
Duration [years]
Ni in solution over time
In the presence of excess (sea)water:
Mg2SiO4 + 4 CO2 + 4 H2O  2 Mg2+ + 4 HCO3
- + H4SiO4
In closed systems or dry climates:
Mg2SiO4 + 2 CO2 + 2 H2O  2 MgCO3 ⬇ + SiO2 ⬇ + 2 H2O
Figure 2. Startscreen
of the Olivine
weathering and CO
sequestration
module, based on the
principles of the
shrinking core model
(see left image)
Figure 4. OWCS model output,
modelled for the input
variables indicated in figure 3
Figure 1. The boxes show the metal concentration of 75 olivine samples of different origin (data from:
De Hoog et al., 2010). The lines indicate the target and intervention value for the soils, as indicated by
Dutch law. Other images show examples of olivine on the earth’s surface
INPUT - Olivine weathering rate
Variables in this box can be changed dependend on the location, soil type and olivine application type
Site specific information
Enter soil pH* Enter lifetime olivine (years)*
6,0 100
Select grainsize olivine* Enter correction factor k
Very fine Standard set to 1 (based on literature)
Ultra fine 1,0
Medium
Coarse
Very fine Olivine composition data
Enter DOC value (mg/L) Enter olivine dissolution rate (kg CO2/kg olivine)
Standard values is 5 mg/L Standart set to 1,25 kg CO2/kg olivine (based on literature)
5 1,25
Enter olivine dosage (ton/ha)* Enter amount olivine to mixture (percentage of total feedstock)
10 Standard set to 100%
Enter application area (ha)* 100%
100 Enter nickel content of olivine
Enter annual rainfall (mm/yr) Standard set to 0,3%
Annual rainfall 2017 was 847 mm (from RIVM) 0,30%
847 Enter magnesium content of olivine
Standard set to 30%
30,0%
Figure 5. Output from the aquatic module which
calculates the Ni speciation , Ni in solution and the
Risk Characterization Ratio (RCR) over time
Figure 3. OWCS model input parameters, divided in site specific
information and olivine composition data
Figure 6. Output from the terrestrial module which calculates the Ni speciation and the Ni uptake in different plant species based on
the bioconcentration values (BCF) for each species.
a
b
Olivine weathering and CO2 sequestration module
© Copyright Deltares Foundation and Innovation concepts. Nothing of this module
may be used, distributed or copied without the prior written consent of the copyright
holders.
START
TDI is 2,8 g Ni/kg bodyweight (EFSA, 2015)
Thanks for sponsoring by Nuova Cives