Tag Archives: Urine Diverting (UD) toilet

South Africa: Harvesting Nutrients That Are Flushed Away

Durban — It might seem unusual for a waste utility to be concerned with the goal of ending world hunger, but that’s part of the mission of the Water and Sanitation department in South Africa’s second largest city of Durban. AllAfrica’s Julie Frederikse spoke with Neil MacLeod, who heads this department for the municipality known by its Zulu name, eThekwini.

“Intensive agriculture requires fertilizers, whose main component is phosphorus, yet where does our phosphorus go after it goes into crops and is digested?” said eThekwini Municipality Water and Sanitation director Neil MacLeod. “Into a toilet. And then it goes into a treatment works, then into a river, and it gets washed into the sea.”

With an estimated 30 percent of household water used to flush Durban’s toilets – water which the city has paid to pump and purify – MacLeod sees flushing toilets as unsustainable technology. Like much of Africa, South Africa is water-scarce, with water restrictions expected soon for this city of 3.7 million, whose population is swelling by some 150,000 people per year.

MacLeod sees salvation in an alternative toilet that uses no water at all. Called the Urine Diverting (UD) toilet, it separates urine from faeces so that nutrients can be recovered and returned to the earth. Nitrogen, potassium and phosphorus – aka NPK 5:3:1 – is an excellent fertilizer for growing vegetables.

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