Disinfection of pathogens in urine will occur using passive solar heating to a target of 70° C for a minimum of 30 minutes. Urine contains nitrogen and phosphorus, both of which are valuable as a liquid fertilizer. The urine will be minimally diluted based on the local salt content in the soils in order to make it an effective fertilizer. Another option is the adsorption of treated urine into the fecal char, making the fertilizer easier to transport, and enhancing the value of the char for agricultural purposes.