Microbial reactor for water treatment

The utility model discloses a microbial reactor for water treatment, which comprises a tower body, the bottom of the tower body is provided with a water outlet device; the top of the tower body is provided with a water inlet device; a filter plate is arranged above the water outlet device; filtering bed fillers are filled on the filter plate, thereby, a filter bed layer is formed; the surface of the filter bed layer is filled with superposed layer fillers; an interception plate is arranged below the water inlet device. The utility model causes the filtering bed and a downflow type fluid bed to combine into a whole. The fluid bed at the upper part adopts a suspended bed layer which is formed by particulate fillers, the particulate fillers have similar specific gravity with water and high specific surface areas, and the surfaces of the particulate fillers have multiple micropores. The utility model causes a fixing bioreactor to keep high active biomass, enhances the biochemical treatment efficiency and causes the biomass not to run off, and water which flows out from the reactor does not need solid-liquid separation. The utility model is especially suitable for treating wastewater with middle and low concentration, treating domestic sewage of cities and towns, and restoring water quality of micro-polluted source water, such as rivers, streams, lakes, etc.