随着合成肥料成本持续攀升，科研人员和企业开始重新审视一种古老的资源：人类尿液。成人每年产生约500升尿液，其中富含氮、磷、钾三种植物生长的关键营养物质1。尽管尿液仅占所有污水的不足1%，但几乎含有所有的氮和一半的磷1。这使得将尿液转化为肥料（业界称为"peecycling"）成为一项潜在的可持续解决方案。
全球多个地区已经启动了相关试验项目。美国非营利组织Rich Earth Institute已运营社区尿液回收计划超过十年1。欧洲初创公司VunaNexus则利用转向的尿液生产可持续肥料，英国、瑞典和南非的体育场馆正在试验这一方法1。澳大利亚研究人员也在布里斯班和悉尼的公园进行尿液肥料试验1。
对澳大利亚等依赖进口肥料的国家而言，这项技术尤为重要。澳大利亚每年需进口350-400万吨合成肥料，几乎完全依赖全球市场1。随着国际肥料供应的不确定性增加，尿液肥料循环利用可能成为提升本土肥料自给能力的新途径。
As synthetic fertiliser costs continue to rise, scientists and researchers are reconsidering an ancient practice: recycling human urine as a nutrient source for agriculture. Adults produce approximately 500 litres of urine annually, which contains nitrogen, phosphorus, and potassium—three essential nutrients for plant growth 1. Despite urine representing less than 1% of all wastewater, it contains nearly all of the nitrogen and about half of the phosphorus typically found in sewage streams 1.
The shift towards "peecycling" holds particular significance for countries heavily dependent on imported fertilisers. Australia, for example, imports between 3.5 and 4 million tonnes of synthetic fertiliser each year and relies almost entirely on global markets to meet its agricultural needs 1. Several pilot programmes are already underway to make this concept a practical reality. In the United States, the Rich Earth Institute has been operating a community urine collection programme for over a decade 1. European start-up VunaNexus has begun producing sustainable fertiliser from diverted urine 1, while sports stadiums in the United Kingdom, Sweden, and South Africa are trialling the method 1. Australian researchers have launched experimental projects in parks across Brisbane and Sydney to test urine-based fertiliser applications 1.
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