Recovery of carbon dioxide from produced water to neutralize liquid brine

A method of sequestering hydrogen sulfide that is present in a carbon dioxide-rich gas stream that is utilized for neutralization of an alkaline liquid brine stream, comprising:

• capturing, as stored carbon dioxide-rich gas, the hydrogen sulfide, along with the carbon dioxide-rich gas stream as an off-gas or waste gas from a gas treatment system and directing the hydrogen sulfide, along with the carbon dioxide-rich gas stream to a storage vessel;
• and
• re-pressurizing, as re-pressurized carbon dioxide-rich gas, the stored carbon dioxide-rich gas, which contains hydrogen sulfide, and injecting the re-pressurized carbon dioxide-rich gas into an alkaline liquid brine stream.

A method of sequestering volatile organic compounds that are present in a carbon dioxide-rich gas stream that is utilized for neutralization of an alkaline liquid brine stream, comprising:

• capturing, as stored carbon dioxide-rich gas, the volatile organic compounds, along with the carbon dioxide-rich gas stream as an off-gas or waste gas from a gas treatment system and directing the volatile organic compounds, along with the carbon dioxide-rich gas stream to a storage vessel;
• and
• re-pressurizing, as re-pressurized carbon dioxide-rich gas, the stored carbon dioxide-rich gas, which contains volatile organic compounds, and injecting the re-pressurized carbon dioxide-rich gas into the alkaline liquid brine stream.