HORIZONTAL-FLOW SAND FILTRATION BASIN AND WATER TREATMENT PROCESS THEREOF

A horizontal-flow sand filtration pool and a water treatment process thereof. The horizontal-flow sand filtration pool comprises a pool body (1), a raw water inlet assembly, a sand filtration bed (4), a filtered water outlet assembly, an aeration assembly, and a back washing assembly; the raw water inlet assembly comprises a water inlet pipe (2) and a water distribution device (3) that supplies raw water to the sand filtration bed (4); the water inlet pipe (2) is connected with the water distribution device (3), the water distribution device (3) is provided in the sand filtration bed (4), and a plurality of water outlet channels are uniformly distributed on the vertical surface of the water distribution device; the filtered water outlet assembly comprises a water collector (5) and a water outlet pipe (7); one side, adjacent to the sand filtration bed (4), of the water collector (5) has a water inlet channel, and the water outlet pipe (7) is communicated with the water collector (5); the back washing assembly comprises a back washing pipe (8) and a drainage pipe (9), the back washing pipe (8) is connected with the water outlet pipe (7), and the drainage pipe (9) is connected with the water distribution device (3). The horizontal-flow sand filtration pool is large in filtration area, thoroughly washes sand grains, and is water-saving and energy-saving; moreover, the horizontal-flow sand filtration pool is extended to a large variety of applications, so that the horizontal-flow sand filtration pool not only can simply serve as a filtration device, but also can be an aerobic/anoxic biological filtration pool integrating biological contact oxidation and suspended matter filtration bed intercepting functions.