Landfill cluster well air injection regulation and control method

Abstract

The invention belongs to the technical field of contaminated site repair, and particularly relates to a landfill cluster well air injection regulation and control method. The regulation and control method includes the steps that the density of a waste pile body at the dumping deep position is acquired according to the formula (1); the air injection pressure of the waste pile body at the dumping deep position is acquired according to the formula (2); and air is injected into the waste pile body at the dumping deep position in accordance with the acquired air injection pressure of the waste pilebody at the dumping deep position. By adoption of the regulation and control method disclosed in the invention, after the air is injected into the waste pile body at the dumping deep position, gas concentration stability can be guaranteed, the covering area of the air is effectively increased, and the requirement for the air amount by different burying depths at the waste dumping area can be met;and moreover, the aerobiotic environment formed in the pile body is good and the reliability is high.

Description

technical field [0001] The invention belongs to the technical field of remediation of contaminated sites, and in particular relates to a gas injection control method for cluster wells in a landfill. Background technique [0002] Ventilation into landfills has become the mainstream method for in-situ rapid restoration of old landfills. In this method, air is injected into the landfill through the air well to form an aerobic environment in the landfill, so that the organic matter in the landfill can be rapidly degraded under aerobic conditions until it is stabilized. [0003] At the beginning of the operation of the landfill, the garbage is usually filled in layers. Generally, the thickness of each layer of landfill is about 3-4m, and the landfill starts from the bottom layer until the reservoir area is filled with garbage. This leads to the consolidation of the underlying landfill under the load of the upper layer of landfill. After a long period of compression, the densit...

AI Technical Summary

Problems solved by technology

Under such working conditions, when the pressure of air injected into the upper and lower landfills is equal, the flow performance of the gas in the upper layer is better than that in the lower layer, resulting in inconsistent oxygen concentrations in the upper and lower landfills, making the lower landfill The effective aerobic zone formed is lower than that of the upper landfill, and the degradation rate of these areas of the lower landfill that did not form an aerobic environment decreased significantly, or returned to an "anaerobic" environment-methane concentration between 3-5% or Higher, if the oxygen concentration is lower than or close to 16%, the degradation and stabilization of some areas in the reservoir area will be delayed

At the same time, when the concentration of methane is close to 5%, it is very easy to cause fire accidents