南非港口城市德班为了鼓励民众使用节水干厕，推出了花钱收购民众尿液的创举。

Get paid to pee. That's the deal on offer in the South African city of Durban, where the city is looking to buy liquid waste to encourage residents to use dry toilets.

Aiming to improve hygiene¹（卫生） and save money, the port city has installed in home gardens about 90,000 toilets that don't use a single drop of water.

Now Durban wants to install 20-liter containers on 500 of the toilets to capture urine - rich in nitrates（硝酸盐） , phosphorus（磷） and potassium（钾） , which can be turned into fertilizer.

A municipal worker would collect the jerry cans（简便油桶） once a week and could pay around 30 rands ($4) to the family - not a small sum in a country where 43 percent of the population lives on less than $2 a day.

Currently the tanks are emptied by each household, and the waste often ends up getting dumped into the environment.

Swiss lab Eawag and the Bill and Melinda Gates Foundation are backing a study to draw up the modalities（形式，样式） for the scheme, which is already winning fans.

"If we can turn the toilets into a source of revenues, then they will want to use the toilets," said Neil MacLeod, Durban's head of water and sanitation²（环境卫生） .

Most people are reluctant to use the dry toilets. In the sprawling³ township of Inanda, residents have ripped doors and roofs off the outhouses, annexed⁴ them to the main house or completely stripped them away.

Discussing bodily fluids is so taboo⁵（禁忌） that people are reluctant to explain their discomfort⁶. One young mother accused thieves of stealing "the door and the toilet" from her outhouse, which she now uses as a garage.

"When the (city) council brings the toilets to them, they look at it as an inferior（差的，下等的） system," said Lucky Sibiya, an outreach officer with the water department.

"People don't understand how important it is," he said. "There is a belief saying that touching⁷ the faeces brings misfortune."

As soon as they can afford it, people invest in a septic tank（化粪池） and abandon the dry toilets, which require spreading a layer of sand after each use and using separate sections for the urine and the solid waste. The tanks then must be emptied regularly.

Dry toilets were invented in Yemen centuries ago.

"They work well in rural areas because the fertilizer produced from the urine and the faeces is used locally," said Pierre-Yves Oger, a water and sanitation consultant⁸ based in South Africa.

"But in urban areas, there's a dissociation between the producer (of the waste) and the user of the recycled products, and it's very hard to overcome the psychological block," he said.

That's why few cities have launched large-scale dry toilet projects. Durban began its program in 2002 when a cholera⁹ outbreak revealed the lack of hygiene in a city where more than a quarter of the 4 million residents have no sanitation.

To avoid having to install an entire sanitation system, and to save water, Durban opted¹⁰ for dry toilets. The city remains¹¹ convinced that was the right choice.

"South Africa is a water-stressed country," said Teddy Gounden, who heads the project. "With the increase in demand for drinking water, we cannot afford to flush（冲洗） this valuable resource down the sewer¹²（下水道） ."