Question

A school in a remote area is planning to install a Dry Compost Toilet (DCT), as the school has limited access to water. The school’s gardener plans to use the compost produced in the school garden.

1. Explain how a DCT works.
2. Write any two benefits of the compost produced in the toilets to the school garden.

Answer 1

1. A Dry Compost Toilet (DCT) works by using aerobic decomposition to break down human waste without water. Waste is collected in a ventilated chamber where it is mixed with organic “bulking agents” like sawdust, wood shavings, or dry leaves. These materials manage moisture and provide carbon, allowing bacteria to turn the waste into dry, odourless compost (humus) over time. Many designs also use urine diversion to keep the compost pile dry and speed up the process.
2. Two benefits of this compost for the school garden are:
   • Soil Enrichment: It adds vital nutrients like nitrogen, phosphorus, and potassium, which improves soil fertility and promotes healthy plant growth.
   • Water Retention: The organic matter improves the soil’s structure, helping it hold onto moisture longer a huge plus for a school with limited water access.