To estimate how much solid and liquid human waste would accumulate daily for a community of 30 people using dry collection toilets with urine diversion, we can use average values based on human waste production. These figures vary slightly by source, but here are standard estimates: ### Solid Waste (Feces): - **Average fecal output per person per day**: ~0.3 kg (0.66 lbs) - **Average volume of solid waste per person per day**: ~0.1 gallons For a community of 30 people: - **Daily solid waste volume**: 30 people × 0.1 gallons = **3 gallons/day** - **Weekly solid waste volume**: 3 gallons/day × 7 days = **21 gallons/week** ### Urine: - **Average urine output per person per day**: ~1.5 liters (0.4 gallons) For a community of 30 people: - **Daily urine volume**: 30 people × 0.4 gallons = **12 gallons/day** - **Weekly urine volume**: 12 gallons/day × 7 days = **84 gallons/week** ### Toilet Collection System: Given the following constraints for the dry toilets: - Each toilet has a **15-gallon solid waste capacity**. - The collection bins should be changed once a week. #### Number of Toilets Required for Solid Waste: The community produces **21 gallons of solid waste per week**. If each toilet has a **15-gallon capacity**, then: - 21 gallons/week ÷ 15 gallons per toilet = **1.4 toilets** (rounded up to 2 toilets). So, **2 dry toilets** would be required to handle the community’s solid waste for a week. #### Urine Storage: For the **84 gallons of urine per week**, each toilet needs a separate urine storage system. If each toilet is shared equally, the required storage per toilet would be: - **84 gallons/week** ÷ 2 toilets = **42 gallons of urine storage per toilet** per week. ### Summary: - **Solid waste**: The community would produce about **21 gallons of solid waste per week**. With **15-gallon bins**, **2 toilets** would be required to accommodate this amount if the bins are changed weekly. - **Urine**: The community would produce about **84 gallons of urine per week**, requiring **42 gallons of urine storage per toilet**. These estimates assume an average diet and standard waste production rates for an adult population. ---