Field evaluation of the fertilizing potential of biologically treated sanitation products

Among different approaches of treating source-separated urine and feces for agronomic utilization, the treatment by addition of nitrifying bio-seeds seems to be useful in increasing the fertilizing potential of these sanitation products by modifying and stabilizing the nitrogen profile. In this study, biological treatment was applied to an onsite resource-oriented sanitation system by adding nitrifying microorganism bio-seeds. Further, the potential of the sanitation products to be utilized as fertilizer for white radish (Raphanus sativus var. longipinnatus) cultivation was examined and compared with that of a commercial fertilizer. This was done through the measurement of nutrients released in soil samples as well as measurements of root mass, root length, and the measurement of accumulated nitrogen, sugar, and water content in plant tissues. Our results show that soil fertilized with a mixture of biologically treated urine and feces exhibits a statistically similar nutrient release trend to soil fertilized using a commercial fertilizer. Moreover, soil fertilized with a mixture of biologically treated urine and feces yielded larger white radishes with a higher sugar and water content, as well as a higher accumulation of nutrients in the plant tissues, than soil fertilized with a commercial fertilizer.