Advanced CO2 ocean dissolution technology for longer term sequestration with minimum biological impacts

Among various CO2 ocean sequestration technologies, measures to restrict the increase of atmospheric CO2 concentration, releasing CO2 droplets from towed pipe of ship reduces biological impact hy the dilution of dissolved CO2 due to the motion of moving ship. CO2 droplets. released around 1500m ocean depth. rise upward due to buoyancy and dissolved CO2 at the sea depth of 500-1500m is considered to outgas to the atmosphere in 20-100 years. Here, we present a new concept of CO2 sequestration in the ocean that CO2 would dissolve at the sea depth deeper than the release point (i.e.. 1500m) and biological impact would be minimized. Before releasing CO2 droplets from the tip of towed pipe of moving ship. hydrate fine particles are formed by injecting water small droplets inside CO2 droplets. Since density of hydrate is 1.1 g/cm(3), CO2 droplets including hydrate Fine particles more than 40 vol% sink downward from release point into deep ocean that result in longer term sequestration. In addition, since depth of ocean is 4000m on an average, long travel distance for CO2 droplets dissolution enables diluted CO2 dissolution, pH profiles in most of the part of sea depth would be larger than 7.0, where biological impact would be minimized. The present concept is verified by an experiment.