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Phosphordünger aus Klärschlamm: Evaluierung von Pyrolysekohle und Alkalipyrolyse

Bünemann-König, Else; Symanczik, Sarah; Koller, Martin; Menold, J.; Oelmann, Y. and Stemann, J. (2017) Phosphordünger aus Klärschlamm: Evaluierung von Pyrolysekohle und Alkalipyrolyse. Paper at: 14. Wissenschaftstagung Ökologischer Landbau, Campus Weihenstephan, Freising-Weihenstephan, 07.-10. März 2017.

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Phosphorus (P) in sewage sludge holds the main proportion of P currently lost in waste streams, and options to recycle it for agriculture are needed. Pyrolysis is a promising local alternative to centralized sewage sludge incineration. Pathogens and organic pollutants are destroyed and a carbon-rich substrate known as biochar is formed. We evaluated pyrolysis of sewage sludge as well as sintering of pyrolysis char with alkali salts. The products were applied in a pot experiment with calcareous and acidic soils to determine P uptake by ryegrass (Lolium multiflorum) and changes in soil
pH, available P and cation exchange capacity. Two products were also tested in a field experiment with maize (Zea mays) on a neutral soil. Cadmium and mercury were partly lost during pyrolysis. The pot experiment revealed interactions between soil pH and P use efficiency of the various products, including reference fertilizers permitted in organic farming. Pyrolysis changed plant P availability only slightly compared to the parent sewage sludge, but sintering with alkali salts increased plant P availability to
levels comparable to triple superphosphate. Potential implications for organic agriculture are discussed.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:biochar, soil pH, phosphorus, recycling
Subjects: Soil > Soil quality
Crop husbandry > Composting and manuring
Food systems > Recycling, balancing and resource management
Soil > Nutrient turnover
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Sustainability > Climate
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland
International Conferences > 2017: Scientific Conference German Speaking Countries > Soil fertility
Switzerland > Other organizations
Germany > Other organizations
Deposited By: Hasreiter, Anna
ID Code:31900
Deposited On:04 Jul 2017 17:21
Last Modified:04 Nov 2020 13:40
Document Language:German/Deutsch
Refereed:Peer-reviewed and accepted
Additional Publishing Information:Dieser Beitrag ist im Tagungsband der 14. Wissenschaftstagung erschienen.
S. Wolfrum, H. Heuwinkel, H.J. Reents, u.a. (Hrsg.) (2017): Ökologischen Landbau weiterdenken - Verantwortung übernehmen - Vertrauen stärken. Beiträge der 14. Wissenschaftstagung Ökologischer Landbau, Freising-Weihenstephan, 7.-10. März 2017
Verlag Dr. Köster, Berlin

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