A mobile modular and scalable processing system for removing radioactive contaminants from nuclear process wastewater, the processing system comprising a plurality of modules, the plurality of modules including: a control module including a control system; a solids feed module; a feed and blend module, the solids feed module configured to, in use, feed a powdered sorbent additive or powdered ion exchange material into the feed and blend module, the feed and blend module configured to, in use, mix the powdered sorbent or powdered ion exchange material into influent nuclear process wastewater so as to provide mixed process wastewater, wherein the feed and blend module is further configured to, in use, allow the powdered sorbent or powdered ion exchange material to absorb a radioactive contaminant from the nuclear process wastewater; a solids removal filter module including a solids removal filter for filtering the mixed process wastewater, wherein the solids removal filter is configured to, in use, collect sorbent solids and waste solids; an ultrafilter module including an ultrafilter for filtering the mixed process wastewater filtered by the solids removal filter, wherein the ultrafilter is configured to, in use, collect colloid suspended solids; and an ion specific media module including ion specific media vessels for removing specific ions from the ultrafiltered water that is passed through the ion specific media vessels, wherein the processing system further includes: a first monitoring means configured to monitor automatically chemical properties of the influent nuclear process wastewater, wherein the control system is configured to adjust stoichiometrically the amount of powdered sorbent additive or powdered ion exchange material; or a second monitoring means configured to monitor automatically chemical properties of the ultrafiltered water going into the ion specific media vessels, wherein the control system is configured to adjust incrementally the amount of powdered sorbent additive or powdered ion exchange material to stabilize any fluctuations in the chemical properties of the ultrafiltered water. a control module including a control system; a solids feed module; a feed and blend module, the solids feed module configured to, in use, feed a powdered sorbent additive or powdered ion exchange material into the feed and blend module, the feed and blend module configured to, in use, mix the powdered sorbent or powdered ion exchange material into influent nuclear process wastewater so as to provide mixed process wastewater, wherein the feed and blend module is further configured to, in use, allow the powdered sorbent or powdered ion exchange material to absorb a radioactive contaminant from the nuclear process wastewater; a solids removal filter module including a solids removal filter for filtering the mixed process wastewater, wherein the solids removal filter is configured to, in use, collect sorbent solids and waste solids; an ultrafilter module including an ultrafilter for filtering the mixed process wastewater filtered by the solids removal filter, wherein the ultrafilter is configured to, in use, collect colloid suspended solids; and an ion specific media module including ion specific media vessels for removing specific ions from the ultrafiltered water that is passed through the ion specific media vessels, wherein the processing system further includes: a first monitoring means configured to monitor automatically chemical properties of the influent nuclear process wastewater, wherein the control system is configured to adjust stoichiometrically the amount of powdered sorbent additive or powdered ion exchange material; or a second monitoring means configured to monitor automatically chemical properties of the ultrafiltered water going into the ion specific media vessels, wherein the control system is configured to adjust incrementally the amount of powdered sorbent additive or powdered ion exchange material to stabilize any fluctuations in the chemical properties of the ultrafiltered water. a first monitoring means configured to monitor automatically chemical properties of the influent nuclear process wastewater, wherein the control system is configured to adjust stoichiometrically the amount of powdered sorbent additive or powdered ion exchange material; or a second monitoring means configured to monitor automatically chemical properties of the ultrafiltered water going into the ion specific media vessels, wherein the control system is configured to adjust incrementally the amount of powdered sorbent additive or powdered ion exchange material to stabilize any fluctuations in the chemical properties of the ultrafiltered water.