| 摘要 |
The invention relates to a septic tank for fluids, the inlet of which can be loaded at the lower part thereof and which employs biological backflow. According to the invention, free ducts are used to remove intermediate liquid from the upper part, thereby creating more space for the aforementioned processes, and the trapped filtered material is recirculated with that from the inlet, providing recirculation or backflow that improves the processes. The invention includes a slow-speed outlet that prevents short circuits. The invention is self-cleaning since it also allows the trapped material to be discharged. The filtering material is contained in the filter and is preferably stratified.
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