Aqueous solutions and methods of using same for remediating contaminants in contaminated gasses

A treatment system for removing and/or remediating contaminants in a contaminated gas, comprising:

• a pipeline which is configured to receive a flowing stream of the contaminated gas therethrough;
• a portion of the pipeline having at least one injection port through which droplets of an aqueous liquid treatment composition containing one or more hydroxide compounds may be injected into the flowing the stream of the contaminated gas in the pipeline such that the aqueous liquid treatment composition mixes into the contaminated gas in the flowing stream and remediates contaminants in the contaminated gas;
• the portion of the pipeline having at least one other injection port through which droplets of water may be injected into the pipeline such that the water mixes with flowing the stream of the contaminated gas and the aqueous liquid treatment composition in the pipeline, the at least one other injection port being located downstream of a position of the at least one injection port;
• and
• a separator located downstream of a position of the at least one injection port injection port and configured to separate the flowing stream of the treated contaminated gas from any remaining amount of the liquid treatment composition, the water and any precipitates and solids released from the contaminated gas.