Modified biofiltration tower

The utility model belongs to environmental protection equipment and application especially indicate a modified biofiltration tower. Including the tower body, locate the air inlet and the gas outlet ofits lower extreme and upper end respectively, lie in the tower body of air inlet top and the packing layer that the bottom was supported by gas permeable plate, the interval locate the packing layertop and with the nutrition fluid reservoir body spray set that the way feeds through that is in charge of, total two tunnel outputs of gas outlet are wherein run in all the way and are put, and another way is offered in tower body side wall and is retrieved the pipeline with the tail gas of packing layer intercommunication through exhaust gas collection pipeline and longitudinal separation and connects in parallel. Accessible tail gas recovery pipeline carries out retreatment to tail gas when the exhaust emissions is not up to standard. The utility model provides a not up to standard, the equipment of tail gas technolo