Safe to spread

时间:2019-03-07 05:07:04166网络整理admin

By Debora MacKenzie THE Danish government is launching a campaign to dissuade consumers from buying products containing detergents called linear alkylbenzene sulphonates (LAS). After soap, these are the world’s most widely used cleaning agents. The campaign is designed to reduce the level of LAS in sewage sludge so that it can be spread on fields as fertiliser. In 1997, Denmark decided that the amount of LAS permitted in sewage sludge spread on fields should be halved to 1.3 grams per kilogram by 2000. To help achieve this, the government will urge consumers to buy only detergents carrying the Nordic “Blue Angel” guarantee, which will be denied to products containing LAS. However, the Council for LAB/LAS Environmental Research, an industry group based in Washington DC, says there is no evidence that the detergents cause any environmental harm. And even at levels of up to 16 grams per kilogram, oxygen breaks down LAS in less than six months,