NOVELTY - Device to obtain and/or enrich biomasses from organic sewage, which passes sewage through filtering masses of flaking material comprises: treatment section (10) having percolation unit(s) (11a-11f), each present as vertically extended column structure (13), and has sewage flowpath; several containers (12) along flow-path, extending transversely to flow-path; and automated device (18, 19, 39) to displace containers to expel and/or remove in selective manner container(s) for removal and/or replacement of saturated filtering masses, and change of position, particularly height of containers.    USE - As device for obtaining and/or enriching biomass from sewage having liquid fraction and solid fraction (preferably organic sewage of zootechnic origin) (claimed), where biomass is useful in production of energy; as organic fertilizers for use in growth of crops of high sanitary quality for alimentary purposes; as amending agents for amending substances compatible for entering possible composting cycle with biogas production or in aerobic process; and for production of fuel for industrial use. The sewage of zootechnic origin is sewage from animal breeding e.g. pig or cattle breeding sewage.    ADVANTAGE - The device is capable of obtaining and/or enriching biomasses from organic sewage having a high liquid component i.e. sewage of zootechnic origin, which involves passing sewage through filtering masses made of flaking material; where the device is simple to produce and extremely compact, is distinguished by low operating cost, albeit has contained overall dimensions so that is useful in animal-breeding farms of small size, is effective and efficient in use, and is transportable in relatively simple way; where known systems are based upon flaking materials having large dimensions and are complex to produce, and hence costly and entail high levels of energy consumption and operating costs. The sewage passage reduces nitrates and other excess elements which are negative in use in agriculture from sewage by capturing, to reuse them e.g. in agriculture, in other forms that do not have harmful impact on environment e.g. as fertilizers, amending agents or energy production. The process results in solid biomasses with homogeneous characteristics and quality. The device is safe and hygienic for the personnel, in so far as single operator works in open air, and contamination is absent. Thus device and process obtain biomasses of homogeneous quality; and enable execution of process of depuration for liquid fraction of sewage at extremely contained cost, and modest occupation of space.    DETAILED DESCRIPTION - Device for obtaining and/or enriching biomasses from sewage having liquid fraction and solid fraction (preferably organic sewage comprising sewage of zootechnic origin), where device is of type that provides for sewage passage through filtering masses that is filtering and aggregating masses made of flaking material, such that filtering masses retain at least part of solid fraction of sewage, comprises: treatment section (10) including percolation unit(s) (11a-11f), each configured as percolation column having vertically extended structure (13), and to each unit there is operatively associated supplying device (14) of sewage or its liquid fraction, and collecting device (16) of at least part of liquid fraction of sewage, where each unit defines between supplying and collecting devices flow-path along which sewage or its liquid fraction, can flow; along flow-path, several containers (12) are sequentially arranged in vertically extended structure of percolation column, particularly drawer containers, where each container has wall provided with opening having dimensions such as to retain material forming respective filtering mass, and containers extend in transverse direction relative to flow-path and in such positions as to be sequentially crossed at least by liquid fraction of sewage; and further automated device (18, 19, 39) for displacing containers of percolation unit(s), arranged to expel and/or remove in a selective manner container(s) relative to vertically extended structure of percolation column of respective percolation unit, in order to carry out removal and/or replacement of filtering masses that are saturated from time to time, and change of position, particularly of height position of containers within flow-path of respective percolation unit. The device further comprises unloading section (20) of containers that comprises automated carrier device for receiving container expelled from percolation column and moving it away from corresponding percolation unit, and automated tipping device for overturning container expelled from structure and discharging its saturated filtering mass; and loading section (30) of containers that comprises store for supplying fresh filtering material, and is provided with outlet having associated with it automated dosing device of filtering material; presser device for pressing from above dosed amount of fresh filtering material loaded into container to compact dosed amount; and/or automated carrier device for leading container containing dosed amount of fresh filtering material at structure of percolation column, of which container has to be inserted. An INDEPENDENT CLAIM is included for obtaining and/or enriching biomass from the organic sewage comprising sewage of zootechnic origin, where sewage is made to pass through filtering masses, particularly made of flaking material, such that filtering masses retain at least part of the solid fraction of sewage, including part in emulsion; each filtering mass, when saturated, is removed and replaced with new filtering mass; and each saturated filtering mass constitutes biomass, involving: providing vertically extended structure of percolation column that defines flowpath for sewage between inlet and outlet; providing along flow-path several containers that are extractable from the structure, and comprise first and second end container, each container housing respective filtering mass, and are in superimposed positions within flow-path; expelling at least first end container to remove its saturated filtering mass and replace it with new filtering mass; changing position within flow-path, particularly height, of other containers including second end container; and inserting in structure further container(s) not belonging to the several containers and containing new filtering mass, in position previously occupied by second end container.    DESCRIPTION OF DRAWING(S) - The figures show cross-sectional view, and side elevation and partial cross sectional view of device to obtain and/or enrich biomasses from organic sewage.    Treatment section (10)    Percolation units (11a-11f)    Containers (12)    Percolation column (13)    Supplying device (14)    Collecting device (16)    Automated device (18, 19, 39)    Unloading section (20)    Loading section (30)