Device and method for processing waste firedamp liquid

The invention relates to a device and a method for processing waste firedamp liquid, belonging to the field of sewage treatment. The invention solves the problems of high cost of purifying the waste firedamp liquid and easy secondary pollution of the traditional processes for treating the waste firedamp liquid. A separation device is arranged under a firedamp fermentation cylinder, the side wall at the lower end of the firedamp fermentation cylinder is communicated with the separation device by a waste firedamp liquid outlet pipe, a liquid outlet on the side wall of a fermentation tank is communicated with one end of an outlet pipe by a sewage pump, and the other end of the outlet pipe is communicated with the upper end of the firedamp fermentation cylinder. The method comprises the following steps: after filtrated, residuals generated after firedamp fermentation is fermented and then completely flows back to be used for fermenting the firedamp, thereby finishing treatment of the waste firedamp liquid. The device for processing the waste firedamp liquid has the advantages of simple structure, low manufacturing cost, little ground occupation, high strength and convenient construction; the method for processing the waste firedamp liquid by the device is simple and convenient to operate and reduces the purification cost, and the generated firedamp is used as energy, which purifies the environment.