Electrochemical membrane reactor for chloramine removal from water

Overview

This solution presents an electrochemical approach to removing chloramines from water using a composite cathode membrane in a compact flow-through reactor. Chloramines are common disinfectants in water treatment and must be removed before use in applications such as dialysis and pharmaceutical manufacturing. The proposed system reduces chloramines to chloride and ammonium ions on the cathode while oxidizing water to molecular oxygen on the anode. Because the electrodes do not participate directly in the redox chemistry, side reactions and electrode degradation are minimized. The process eliminates the need for chemical additives and does not generate a waste stream, offering a cleaner alternative to existing treatment methods.

Technical specifications

• Cathode: High surface area composite cathode membrane adapted from prior dehalogenation research, enabling rapid removal of chloramines
• Anode: Inert electrode selected to oxidize water to molecular oxygen without participating in side reactions
• Operating conditions: Low applied potentials, suitable for variable temperatures and flow rates encountered in real water systems
• Reactor design: Small flow-through configuration with minimal hydraulic residence time requirements
• Performance basis: Prior work demonstrated rate constants 2 to 4 orders of magnitude higher than previously reported methods for similar halogenated compounds
• Inputs/outputs: Accepts chloramine-containing water; outputs water containing chloride and ammonium ions with no chemical additives required

Technology readiness level

This technology is at an early research and proof-of-concept stage. The hypothesis is supported by prior experimental work on electrochemical dehalogenation of haloacetic acids and by initial theoretical calculations suggesting the existing system is sufficient for chloramine removal. Future validation will involve testing synthetic and real waters across different pH values, ionic compositions, anode materials, and cell configurations. The one-year validation plan will define hydraulic residence times, reactor geometry, and electrode surface areas needed to meet treatment criteria. Commercial deployment would follow successful bench-scale validation and scale-up testing.