NOVELTY - The wood chip based bio-filtration system comprises an organic media layer with microorganisms, a unit for controlling physical characteristics of an initial point of contact, a semi-cylindrical enclosure placed exterior of a confined animal feeding operation of building, an access door (106) present in the enclosure to allow ingress of a human being into the enclosure, a unit for hydrating the initial point of contact such that the airflow tends to move moisture provided by a hydration system, when a moisture first contacts the airflow in a direction towards the initial point of contact.    USE - The wood chip based bio-filtration system is useful for removing matter such as feathers, dust and fecal matter, ammonia, hydrogen sulfide and other pollutants from an exhaust fan emissions from a confined animal feeding operation building.    ADVANTAGE - The modular wood chip based bio-filtration system is capable of effectively, mechanically and rapidly removing matter and pollutants from the airflow exhausted from the confined animal feeding operation building with less labor intensive, and allows multiple installation.    DETAILED DESCRIPTION - The wood chip based bio-filtration system comprises an organic media layer with microorganisms, a unit for controlling physical characteristics of an initial point of contact, a semi-cylindrical enclosure placed exterior of a confined animal feeding operation of building, an access door (106) present in the enclosure to allow ingress of a human being into the enclosure, a unit for hydrating the initial point of contact such that the airflow tends to move moisture provided by a hydration system, when a moisture first contacts the airflow in a direction towards the initial point of contact, a unit for mixing and blending the organic media layer with other matter, which has accumulated at the initial point of contact to increase a consumption rate of the microorganisms to balance an emission rate of an exhaust fan (101) and to increase the overall rate of air flowing past the initial point of contact, and an agitating unit for dispersing matter, which is accumulated at the point of initial contact to improve an overall rate of airflow through the organic media layer. The organic media layer: is disposed in an airflow for removing odor from air passing through the layer and in a stainless steel containment tray (100); has an initial point of contact, where the air flow first encounters a portion of the organic media layer; comprises wood chips, tree bark, peat and/or straw; forms a portion of the enclosure through which the airflow is permitted to exit the enclosure; and is further disposed in a container, which is supported on one end by the earth and at another end by an exterior portion of the confined animal feeding operation building or by a separate enclosing wall and intermediately by an adjustable leg or suitable stationary support. The initial point of contact is: located within the enclosure to allow access by a human being and partially located within the airflow to facilitate direct visual inspection of the initial point of contact; and substantially planar and parallel to the surface of the earth and placed on topside of the organic media layer. A direction of airflow through the organic media layer has an upward direction. A substantial portion of the enclosure is formed with a translucent material and a transparent material. The enclosure: confines and channels a portion of the airflow; is configured to allow ingress of a human being into the enclosure to perform the visual inspection or maintenance; is a transparent tunnel structure disposed over the organic media layer; further has an access door on an end of the enclosure opposite from the confined animal feeding operation building; is disposed adjacent to the exhaust fan of the confined bird feeding operation building; and extends orthogonally from the confined bird feeding operation building comprising a transparent polycarbonate roof panel over a skeletal frame, the stainless steel containment tray configured for holding porous organic media, a support structure to elevate the stainless steel containment tray above the surface of the earth, an end panel disposed opposite of the exhaust fan, and an automated stirring rake (114), which is sized, configured and located, when actuated by an actuating signal, to disperse matter accumulating at the initial point of contact, which is impeded airflow through the organic media layer to increase air pressure within the enclosure, and spray nozzles (113) comprising the hydration system. The agitating unit comprises an air pressure sensor for determining, when the agitating unit is actuated. The portion of the enclosure is a surface of the earth. The airflows through the organic media layer are placed in a downward direction. The transparent polycarbonate roof panel is configured to allow the human being to perform a visual inspection of the initial point of contact from outside the enclosure. The access door allows the human being to physically enter the enclosure to mix the organic media at the initial point of contact. The pressure sensor: is, disposed in, and configured for measuring air pressure, within the enclosure; and provides for the actuating signal. The automated stirring rake is configured to continue to operate until the pressure sensor determines such that the air pressure within the enclosure has dropped below a termination threshold. The hydration system of spray nozzles is disposed above the initial point of contact and sprays water on the system for maintaining a moist environment for microbial growth.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic side view of a bio-filtration system.    Porous media containment tray (100)    Exhaust fan (101)    Access door (106)    Spray nozzles (113)    Stirring rake. (114)