Innovative plant for the Conservative Removal of Nitrogen from livestock slurries and digestate
The project aims to develop an innovative technology for the removal of nitrogen from livestock manure and to create a pilot plant that can demonstrate the possibility of introducing the system in livestock farms. The technology to be developed involves the removal of nitrogen in the form of gaseous ammonia which is removed in an air stream. The subsequent passage of the air in sulfuric acid allows to obtain ammonium sulphate which can be easily transported and used as a mineral fertilizer.
The project plans to use a simplified nitrogen stripping technology based on a process tested in the laboratory with good results and which has been shown to have the characteristics suitable for introduction into livestock farms. The process involves the permanence of slurry or digestate in a container in which the surface of the liquid is lapped by a flow of air which is charged with ammonia which is subsequently sent to a scrubber where ammonium sulphate is formed. On this basis, a pilot plant will be built and the possibility of introducing the technology to livestock farms will be evaluated and demonstrated.
In Lombardy, many livestock farms produce livestock manure with nutrient content in excess of regulatory constraints (170 kg / ha of livestock nitrogen in vulnerable areas and 340 kg / ha in non-vulnerable areas). For this they must find land on which to distribute tha manure or treat the effluents by removing nitrogen. Most of the farms that have nitrogen excesses according to the legislation, are at the same time having to purchase mineral nitrogen fertilizers to meet the nutritional needs of crops that require nitrogen inputs well above the 170 kg / ha provided for by the standard. The possibility of extracting nitrogen in mineral form from the effluents therefore constitutes a significant possibility of using the product obtained as a fertilizer. Pending the possibility of using it in livestock farms (currently the legislation classifies it as livestock manure, but an opening to the use of these products is foreseeable in the next few years) it is still possible to transport it easily and use it in agricultural areas with low livestock load.
The project aims to develop an innovative technology for the removal of nitrogen from livestock slurries by means of a simplified ammonia stripping technology. The technique already tested in the laboratory for the volatilization of ammonia from mixed and heated containers to then form an ammonium salt to be used as fertilizer will be developed.
A pilot plant will be built capable of treating a significant amount of product (1-2 cubic meters per day) which will be used with different types of sewage (in particular those of the partner farm of the project. The plant will consist of 4 reactors that will treat the slurries in batch mode in order to volatilize the ammonia and then convey it to a scubber who washes it with a solution of sulfuric acid to form ammonium salts.
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Brochure informativa del progetto
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Scheda tecnica dell’impianto pilota
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Presentazione del progetto e delle prestazioni dell’impianto
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Pubblicazione scientifica sul processo di strippaggio
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