Modular CO

1. A shippable modular unit configured for use in sequestering CO 2 from a gaseous source of CO 2 , the shippable modular unit comprising:

(a) a housing;

(b) a CO 2 gas/liquid contactor subunit associated with the housing;

(c) a carbonate production subunit associated with the housing and configured to produce a solid phase CO 2 sequestering carbonate material in association with a seed structure; and

(d) the seed structure present within the carbonate production subunit comprising at least one component selected from the group consisting of sand, a shell fragment, gravel, pulverized rock, cement kiln dust, red mud, coarse aggregate, and friable Pleistocene coral rock.

2. The shippable modular unit according to claim 1 , wherein the shippable modular unit is configured to be operatively coupled to one or more additional shippable modular units each comprising:

(a) a support; and

(b) at least one type of subunit selected from the group consisting of:

a CO 2 gas/liquid contactor subunit;

a carbonate production subunit; and

an alkali enrichment subunit;

a water softening subunit;

a cation recovery subunit;

a heat exchange subunit;

a reverse osmosis subunit;

a nanofiltration subunit;

a microfiltration subunit;

an ultrafiltration subunit; and

a purified CO 2 collection subunit;

associated with the support.

3. The shippable modular unit according to claim 1 , wherein the shippable modular unit is configured to be transported by rail.

4. The shippable modular unit according to claim 1 , wherein the shippable modular unit is configured to be transported by truck.

5. The shippable modular unit according to claim 1 , wherein the shippable modular unit is configured to be transported by boat.

6. The shippable modular unit according to claim 1 , wherein the housing has an internal volume ranging from 8 to 30,000 m 3 .

7. The shippable modular unit according to claim 1 , wherein the shippable modular unit has a mass ranging from 1 ton to 20,000 tons.

8. The shippable modular unit according to claim 1 , wherein the seed structure comprises at least one component selected from the group consisting of gravel, pulverized rock, friable Pleistocene coral rock, and coarse aggregate.

9. The shippable modular unit according to claim 1 , wherein the seed structure comprises a component comprising internal pores.

10. The shippable modular unit according to claim 1 , wherein the seed structure comprises at least one component selected from the group consisting of sand and gravel.

11. A system configured to sequester CO 2 from a gaseous source of CO 2 , the system comprising:

two or more operably coupled shippable modular units, each shippable modular unit comprising:

(a) a housing having at least one material input and least one product output;

(b) a CO 2 gas/liquid contactor subunit present in the housing;

(c) a carbonate production subunit present in the housing and configured to produce a solid phase CO 2 sequestering carbonate material in association with a seed structure; and

(d) the seed structure present within the carbonate production subunit comprising at least one component selected from the group consisting of sand, a shell fragment, gravel, pulverized rock, cement kiln dust, red mud, coarse aggregate, and friable Pleistocene coral rock.

12. The shippable modular unit according to claim 11 , wherein the seed structure comprises a component comprising internal pores.

13. A method for sequestering CO 2 from a gaseous source of CO 2 , the method comprising:

(a) introducing a gaseous source of CO 2 into a system according to claim 11 ; and

(b) obtaining a carbonate product material from the modular unit.