Nutritional Value of Struvite Deriving from Sewage Sludge
Since natural phosphorus sources are limited, recycling processes are becoming important for agriculture. A great nutrient source is given by wastewater and sewage sludge. However, besides potential recyclables, sewage sludges also often contain harmful substances. One product of sewage sludge to be evaluated is struvite, which is recovered during the treatment of municipal wastewater and sludge production. This study aims to present the groundwork for developing a new fertilizer from upgraded sewage sludge, including an evaluation of contents of nutrients and heavy metals. The struvite under study contains 10.9％ total phosphorus, but only 0.3％ of the material was found to be water-soluble phosphorus. The amount of phosphorus available after extraction in citric acid was much higher, reflecting a fertilizing potential within the range of other legally certified fertilizers. In plantpot experiments a high plant availability of the struvite phosphorus under study was confirmed. In terms of heavy metal contents struvite showed contaminant levels manifold lower than the limiting values of the German Sewage Sludge Ordinance. Thus struvite phosphorus recovered from the wastewater path may substitute existing mineral fertilizers.
wastewater sewage sludge phosphorus recovery struvite fertilizer heavy metals
KERN Jürgen MARKUS Bennar ENGELS Christof
Leibniz Institute for Agricultural Engineering Potsdam-Bornim e.V. (ATB), Max-Eyth-Allee 100, 14469 Humboldt University of Berlin, Albrecht-Thaer-Weg 4, 14195 Berlin, Germany
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）