Integrated exhaust gas systems, methods, and processes are disclosed that includes pretreatment, treatment and post-treatment processes arranged in a variety of reaction environments to address varied application requirements and end product requirements is described in this disclosure. In addition, a contemplated ballast water treatment system—that can be used in combination with the integrated exhaust gas systems can treat seawater and return it to storage within the vessel or send treated water back to the sea. This system can be sized to treat the seawater as it is leaving the ship without prior treatment, while the seawater is aboard or treat the seawater that is within the ship and add any additional treatment to the water, as the seawater leaves the ship. This system is not involved with pumping the seawater into the ship or filtering the water prior to storage as ballast water.