A unit wastewater treatment small-scale unit comprising treatment an Prompter series of trays (1, 9) solid background arranged together downwardly in the direction of ater flow to be treated and containing a filler replaceable or cleanable, the tilt trays witha 0-10% being positioned and having containers (1, 9) at least one end wall or skirt that has deaberturas (4, 13) for passing water in each series of trays always from a higher tray (1, 9) to lasiguiente tray below it, the waste water being forced to try to flow through cadabandeja and a layer of filling material contained therein in a substantially horizontal flow to at least one end wall or skirt of the tray (1, 9), providing openings (4, 13) present in lamisma a passageway for water to flow into the next tray in the series, so that elagua residual treated is forced to flow through all trays in each series of trays detratamiento unit and discharged through openings (4, 13) provided in the skirt or end wall labandeja lower series of trays, characterized in that the discharge openings (4, 13) proporcionadasen one or more flaps or end walls of the trays (1, 9) used in the treatment unit are estándiseñadas as a toothing cut in V for uniform distribution of water throughout laanchura tray (1, 9).
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