Getting Rid of CO2 at Sea Not So Easy

In searching for ways to counter the greenhouse effect, scientists have proposed capturing the primary greenhouse gas carbon dioxide as it is emitted from power plants, then liquefying the gas and injecting it into the ocean.

But there are problems with that plan. The carbon dioxide (CO2) can rise toward the surface, turn to gas bubbles and vent into the atmosphere, defeating the purpose of the whole plan. Then, if the liquid-to-gas conversion happens suddenly, the gas can bubble up in a plume and erupt – a potential hazard.

Small-scale ocean experiments have been done to investigate how the carbon dioxide actually would behave, but such experiments are too costly and time consuming to carry out under a wide range of ocean conditions.

But a new theoretical model developed by University of Michigan researcher Youxue Zhang can be used to explore the fate of CO2 injected into oceans under various temperature and pressure conditions. Zhang’s model shows that liquid CO2 would have to be injected to a depth of at least 800 meters (about a half mile) and possibly as much as 3,000 meters (nearly two miles) to keep it from escaping.

Eruptions from injected CO2 are a serious concern, Zhang said, “because carbon dioxide is known to have driven deadly water eruptions.”

In 1986, a CO2-driven eruption in Cameroon’s Lake Nyos killed some 1,700 people, as well as animals in the area. Two years earlier, a smaller release of CO2 from Lake Monoun in Cameroon resulted in 37 human deaths.

The deaths were not directly caused by the explosions, but resulted from carbon dioxide asphyxiation. Zhang said, “Carbon dioxide is denser than air, so it settled down and flowed along the river valley, choking people and animals to death.”

The challenge in designing CO2 injection strategies is figuring out how to keep droplets of the liquid from rising to 300 meters, the approximate depth at which, depending upon temperature and pressure, liquid carbon dioxide becomes a gas. One solution is to make the droplets smaller.

“If they are small enough they should dissolve completely before reaching the liquid-gas transition depth – assuming everything works perfectly,” said Zhang, a professor of geological sciences. However, at a high injection rate, seawater full of CO2 droplets would have an average density smaller than that of surrounding seawater, creating conditions that could lead to a rapidly-rising plume.

Problems also could occur if the injection device malfunctioned, producing larger droplets. “An even safer injection scheme, Zhang said, would be to inject into a depth of more than 3,000 meters, where CO2 liquid is denser than seawater and would sink and dissolve.”

Calculations based on Zhang’s theory match observations from experiments in which remotely controlled submersibles tracked and photographed individual droplets of liquid CO2. Zhang’s work was described in a paper in the October 1 issue of the journal “Environmental Science & Technology.”

The research was partially supported by the National Science Foundation and the American Chemical Society Petroleum Research Fund.

Source: ENS