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ID321 Ashes from natural wood chip under fireplace

Webinar: The Nutriman Project and Platform: Accessible products to recycle nutrients - organic nitrogen and phosphorus fertilizers

May 13, 2021

The webinar (06 May, 2021) aimed to inform participants about the Nutriman project and to present the farmers' platform and examples of the products and technologies it contains. In addition, this was the perfect opportunity to explain to farmers and field specialists how to search and find the information that the Nutriman farmers' platform offers (e.g.

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Thematic training material for the use of struvite as fertilizer has been published

May 13, 2021

Struvite is an ammonia and magnesium phosphate hexahydrate (NH4MgPO4·6H2O). When ammonia and phosphate are found in solution, they can be removed by adding a magnesium salt, under controlled conditions, and white glowing crystals of struvite can then be recovered. One of the main advantages of recovering struvite from waste flows is the high selectivity of the reaction therefore the recovered product will not contain heavy metals either organic residues at significant concentrations. Struvite has low solubility in water but a high solubility in acidic solution, thus the humic acids are very efficient in increasing the solubility of struvite in the soil and this genuine slow-release fertiliser character prevents plant’s roots from burning even if applied in excess. Besides, the low solubility in water will prevent P losses due to filtrations or runoffs. In addition, conventional fertiliser manufacturing processes are energy-intensive involving mining, long transport distances, thermal processes, and in some cases direct combustion of fossil fuels for product manufacture (e.g. urea production). In contrast, struvite recovery facility operates on a total installed electrical capacity of around 25 horsepower.

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ID448

Thematic training material for the use of precipitated calcium phosphate as fertilizer has been published

May 13, 2021

Precipitated calcium phosphate refers to a phosphorus-calcium rich product (Ca5(PO4)3OH) with a very low content of heavy metals. It is a white powder or granule fertilizer. Precipitated calcium phosphate is obtained by Ash2Phos technology. The process consists of 3 sequential steps: a first acidic step, a second alkaline step (where intermediate products are produced), and finally a conversion step where the intermediates are processed into final products. A clean precipitated calcium phosphate can be recovered from sewage sludge. More than 90% of P in the ash is recovered.

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