A treatment module for use in an abatement system for process exhaust gases. The treatment module has a centrally located flame wall oxidizer module that cause the process exhaust gases to travel within a cylinder of gas a short distance upon exiting the exhaust conduit before the gases are oxidized. Following oxidation, two coaxial cylinders of water spray flush solid, liquid and water soluble components of the oxidation products from the resulting oxidation products stream into a bottom water reservoir. The first inner water spray cylinder coaxially surrounds the flame wall oxidizer module and flows co-currently with the downward flow of oxidation products. The gaseous oxidation products then turn 180 degrees and pass upward through a second outer water spray cylinder located coaxial to and surrounding the first water spray. Thereafter, the remaining water insoluble gaseous oxidation products exit the treatment module.