URINE-DIVERTING DRY TOILETS PRODUCTS POTENTIAL FOR AGRICULTURE USE IN A VILLAGE OF COTTON PRODUCERS IN MALI

Código

XXVI-SBRH0199

Autores

Camila Silva Franco, LUCIANA SANCHES, ANDRÉA APARECIDA RIBEIRO CORRÊA, Milson Evaldo Serafim

Tema

B - Usos múltiplos da Água e Reuso

Resumo

Safe recovery of sanitation-derived resources for soil and plant benefit can enhance soil structure, microbial biodiversity, and nutrient provision. In Bandiagara II, Mali, a village of 630 residents, urine-diverting dry toilets were implemented to face water scarcity. Feces are sanitized using ammonium through a 1:1 mix of lime and ash (130 g/person) with 2% urea to elevate pH, inactivating pathogens for safe soil use. Nutrient content (N, P?O?, K?O, Ca, Mg) was assessed through agrochemicals used for cotton production in the village and a literature review for feces treated by the same method. The nutrient cost was calculated based on the cost of agricultural products in Mali and their constituent percentages. For the treated fecal material, 5% handling losses and an 85% correction factor were applied to account for the inconvenience of using sanitary products in agriculture. Annual treated feces production was estimated at 45,139 kg, yielding 227 kg/year of N, 654 kg/year of P?O?, 460 kg/year of K?O, 7109 kg/year of Ca, and 463 kg/year of Mg, sufficient to meet the nutrient demands for cotton production in 5.23, 24.22, 17.06, 107.72, and 19.23 hectares, respectively. The treatment cost ($3,767/year) was outweighed by the estimated treated material's value ($5,384/year), excluding the carbon benefits on the soil. This approach promotes sanitation, health, waste management, and nutrient cycling. However, pilot studies for field cotton production are required to understand its effects on cultivation.