PROCESS OF AMMONIUM RECOVERY FROM LEVIGATES AND SLUDGE

PROCESS OF AMMONIUM RECOVERY FROM LEVIGATES AND SLUDGE

The invention relates to a process for treating municipal fermented sludge with a view to obtaining products to be used as fertilizers and alkalinizing soil improvers. According to the invention, the process consists in precipitating ammonium ion with hot-hydrated calcined dolomite, in the presence...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: PASCU LUOANA FLORENTINA, PĂTROESCU ION VIOREL, DAMIAN CONSTANTIN, DINU LAURENŢIU RĂZVAN, BĂDESCU VALERIU ROBERT, BUMBAC COSTEL, ŞTEFĂNESCU MIHAI, CRISTEA NICOLAE IONUŢ
Format: Patent
Sprache:eng ; rum
Schlagworte:
CHEMISTRY
FERTILISERS
MANUFACTURE THEREOF
METALLURGY
ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:The invention relates to a process for treating municipal fermented sludge with a view to obtaining products to be used as fertilizers and alkalinizing soil improvers. According to the invention, the process consists in precipitating ammonium ion with hot-hydrated calcined dolomite, in the presence of phosphoric acid, from municipal anaerobically fermented sludge, or sludge water, from the anaerobically fermented sludge dehydration, as double ammonium and magnesium phosphate, struvite, after which the mixture of anaerobically fermented sludge and struvite is conditioned with a flocculant cationic polymer and dehydrated at a pressure of 5...8 bar, up to a solid concentration of 15...35%, to result in a dehydrated sludge which is applied onto the soil as pH regulating improver and multi-component N-P-Ca-Mg fertilizer.