The invention discloses a biological ventilation
system for contaminated site restoration. The biological ventilation
system is arranged at a contaminated site to be restored. The biological ventilation
system comprises a gas-liquid separating device, a gas
injection device, an extraction device, a gas
treatment unit, a liquid
treatment unit and a
pipe well extending into contaminated soil. The upper end of the
pipe well is in sealed connection with a pipeline, the lower end of the
pipe well is sealed, a plurality of through holes are formed in the well wall of the pipe well, the pipe well isinternally provided with a header pipe, and the gas
injection device and the extraction device are connected with the header pipe through a gas injection pipeline and an extraction pipeline. The gas-liquid separating device is connected with the extraction pipeline, and a liquid outlet of the gas-liquid separating device is connected with the liquid
treatment unit. An air inlet of the extraction device is connected with an air outlet of the gas-liquid separating device, and an air outlet of the extraction device is connected with the gas treatment unit. In the biological ventilation system, the pipe well serves as a gas
injection well and also serves as an extraction well and has double functions, the number of wells is reduced, the time of contact between microorganisms and air is prolonged, the contact area of the microorganisms and the air is increased, the degradation efficiency of the microorganisms to pollutants is improved, the cost is greatly reduced, and relatively high efficiency can be achieved.