A system for treating a contaminated fluid to generate a treated fluid having a reduced hardness and contaminant content, the system comprising: a feed stream fluidly connected to an aeration unit and configured to provide the contaminated fluid to the aeration unit ; the aeration unit comprising a compressed gas inlet connected to a dry side of a dissolved oxygen addition device, wherein the dissolved oxygen addition device comprises a substrate comprising the dry side and a wet side, and having pores less than 1 micron in diameter; wherein the aeration unit is configured to generate an aerated fluid at a flow rate by releasing a gas through the compressed gas inlet at a pressurized gas rate such that the gas travels through the substrate creating bubbles in the contaminated fluid travelling along the wet side; a chemical inlet disposed downstream of the aeration unit and configured to meter an additive into the aerated fluid, wherein the additive comprises at least one of a coagulant and a hydroxide precipitating agent; a reactor tank disposed downstream of the chemical inlet and configured to receive and retain the aerated fluid stream comprising the additive for a retention time generating a retained fluid; and a filtration unit comprising a ceramic membrane and disposed downstream of and in fluid communication with the reactor tank such that the filtration unit is configured to receive and filter the retained fluid generating the treated fluid . a feed stream fluidly connected to an aeration unit and configured to provide the contaminated fluid to the aeration unit ; the aeration unit comprising a compressed gas inlet connected to a dry side of a dissolved oxygen addition device, wherein the dissolved oxygen addition device comprises a substrate comprising the dry side and a wet side, and having pores less than 1 micron in diameter; wherein the aeration unit is configured to generate an aerated fluid at a flow rate by releasing a gas through the compressed gas inlet at a pressurized gas rate such that the gas travels through the substrate creating bubbles in the contaminated fluid travelling along the wet side; wherein the dissolved oxygen addition device comprises a substrate comprising the dry side and a wet side, and having pores less than 1 micron in diameter; wherein the aeration unit is configured to generate an aerated fluid at a flow rate by releasing a gas through the compressed gas inlet at a pressurized gas rate such that the gas travels through the substrate creating bubbles in the contaminated fluid travelling along the wet side; a chemical inlet disposed downstream of the aeration unit and configured to meter an additive into the aerated fluid, wherein the additive comprises at least one of a coagulant and a hydroxide precipitating agent; a reactor tank disposed downstream of the chemical inlet and configured to receive and retain the aerated fluid stream comprising the additive for a retention time generating a retained fluid; and a filtration unit comprising a ceramic membrane and disposed downstream of and in fluid communication with the reactor tank such that the filtration unit is configured to receive and filter the retained fluid generating the treated fluid . <EOS>