Liquid waste—including urine and small amount of solid waste that is transferred to the liquid waste upon flushing—will be disinfected through electrochemical processes using economically priced and commercially available mixed metal oxide electrodes. The disinfected water will be suitable for use as flush water for the toilet or as a fertilizer supplement.
The module is a three tank system consisting of a baffled buffer tank to promote settling and dissolution of large particles prior to undergoing electrochemical treatment, a preprocess tank where settled liquid is held until it can be processed, and a central processing tank where electrochemical disinfection takes place. Once disinfection is complete the process tank contents are transferred to a holding tank where the sterile liquid is stored until needed for flushing.
In the central processing tank mixed metal oxide electrodes convert the natural salts found in urine into oxidants such as chlorine. The electrochemically generated oxidants disinfect the liquid by destroying the pathogens that come from exposure to the solid waste during flushing. Residual chlorine levels present at the completion of a processing provide further disinfection capabilities.