| 摘要 |
A tank (1) for wastewater treatment comprises a first treatment chamber (11), in which the waste water, or sewage, is fed through an inlet duct (12). In the first treatment chamber (11), the waste water is subject to a physical treatment for separating it into a first fraction (101) having a high concentration in solid particles, which is deposited mainly on the bottom (15) of the chamber (11), and in a second fraction (102) at high concentration of the liquid part, lighter, which is rises, instead, above the first fraction (101) up to a certain height from the bottom (15). In a first exemplary embodiment, the tank (1) comprises, furthermore, a second treatment chamber in which the liquid fraction (102) of the waste water is supplied, for example through a transfer duct (50), for being subject to a following treatment that causes the production of a clarified liquid fraction (102') drawn through an outlet (24). The clarification of the liquid fraction (102) in the second treatment chamber (21) is effected by a separation means (150) comprising at least one membrane of tubular shape (151) having an outer surface (152) equipped with a plurality of pores (156) of measured size. The, or each, membrane of tubular shape (151) is arranged in a vertical position in the treatment chamber. |
