Leaky recycling

时间:2019-03-07 10:12:02166网络整理admin

By Barry Fox Human urine could replace a quarter of the commercial fertiliser currently used for food crop production, estimates A+ Science of Gothenburg, Sweden. But health authorities worry about hygiene. The company has tested a system which purifies human urine by removing all traces of solid excrement. The urine is cooled until half is frozen. The remaining liquid, which contains most of the nutrients,