Using sludge on arable land - effect based levels and long-term accumulation for certain organic pollutants
Hide / Show Abstract

Using sludge on arable land - effect based levels and long-term accumulation for certain organic pollutants

In the waste water treatment process in sewage treatment plants, sewage sludge is produced as a by-product. The sludge contains nitrogen and phosphorus that originate from the waste water. In addition to these nutrients, sludge also contains micronutrients and organic matter. Many of these substances are required for the production of food and they can be recycled by using sludge as a fertiliser on farm lands. Phosphorus is the nutrient that is of primary interest at present. This is due to the fact that phosphorus is a finite resource that is mined and has various levels of unwanted impurities. In the foreseeable future, there will be a shortage of phosphorus ore with low levels of impurities. Ores with higher levels of impurities may also be used in the production of mineral fertilisers in the future, but it may require that energy demanding cleaning techniques are used. Such a scenario will lead to higher market prices for phosphorus fertilisers, which may have social consequences on a global scale. It is therefore crucial that the available phosphorus is used efficiently, from an economic, environmental and social perspective.

Click to Access: 
    http://oecd.metastore.ingenta.com/content/tn2011-506.pdf
  • PDF
  • http://www.keepeek.com/Digital-Asset-Management/oecd/environment/using-sludge-on-arable-land-effect-based-levels-and-long-term-accumulation-for-certain-organic-pollutants_tn2011-506
  • READ
 
Chapter
 

Methods and data You do not have access to this content

English
Click to Access: 
    http://oecd.metastore.ingenta.com/content/9789289330916-4-en.pdf
  • PDF
  • http://www.keepeek.com/Digital-Asset-Management/oecd/environment/using-sludge-on-arable-land-effect-based-levels-and-long-term-accumulation-for-certain-organic-pollutants/methods-and-data_9789289330916-4-en
  • READ
Author(s):
Nordic Council of Ministers

Hide / Show Abstract

The evaluative step is critically dependent on pertinent data on current levels of organic pollutants in sludge in the nordic countries. Data on sewage sludge has been compiled by using open sources (databases and reports) and scientic papers. National experts were also contacted in all nordic countries in order to identify all available data. It is assumed that all studies from which data were compiled used sufficient QA/QS on the analytical methods used. Quality check in this study was constrained to identifying obvious outliers in datasets.