Biological trickling filter

The utility model provides a bio-trickling filter which comprises a tower body with a working inner cavity, and an air inlet, an air outlet and a liquid outlet which are formed in the tower body and communicated with the working inner cavity, and a sprayer is further arranged at the top of the working inner cavity of the tower body; the tower body is also provided with a circulation channel communicated to the working inner cavity, and an outer port of the circulation channel is connected with a biological incubator. Through the arrangement, organisms in the biological culture box can enter the working inner cavity of the tower body through the circulation channel, excessive microorganisms on the surface of the filler are loosened by utilizing the activity behavior of the organisms, so that the pressure drop of the bio-trickling filter is kept at a lower level for a long time, and the operation cost is reduced. 本实用新型提供一种生物滴滤塔，包括具有一工作内腔的塔体以及开设在塔体上并连通工作内腔的进气口、出气口和出液口，所述塔体的工作内腔的顶部还设置有喷淋器；所述塔体上还开设有连通至工作内腔的流通通道，所述