A method of using deep mineralized obsolete waste to compound for landfill coverage

Abstract

The invention belongs to the technical field of garbage treatment, and in particular relates to a method for compounding deep mineralized stale garbage for landfill coverage. In the present invention, the deeply mineralized obsolete waste is used for the daily covering, intermediate covering and closure repair covering of the landfill respectively. The anti-seepage layer and function adjustment layer are laid in order from top to bottom; the filling materials for closure and restoration cover are vegetation layer, drainage layer, anti-seepage layer and exhaust layer from top to bottom. The invention gives full play to the physical, microbial activity and hydraulic properties of the deeply mineralized old garbage humus, accelerates the biodegradation and stabilization process of the landfill, effectively improves the internal biodegradation environment of the landfill, and at the same time strengthens the protection of the landfill. The ecological restoration function of the field. The deep mineralization of old waste humus can realize local materials, realize the reduction and reuse of solid waste in landfills, and can also save landfill operating costs.

Description

technical field [0001] The invention relates to the technical field of garbage treatment, in particular to a method for compounding deep mineralized stale garbage for landfill coverage. Background technique [0002] At present, sanitary landfill is still the main treatment method for domestic waste in my country. Although the number of waste incineration plants and the proportion of waste incineration in my country have grown rapidly in recent years. But in the future, landfill will still be the main way of domestic waste disposal in our country. The landfill process will involve daily coverage, intermediate coverage and closure restoration coverage. Relevant national technical standards require that the paving, compaction and covering of the garbage should be completed within 24 hours after the garbage enters the site. The thickness of the covering layer should be determined according to the covering material, and the thickness of the soil covering layer should be 20-25cm...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, sandy soil and clay are mainly used as covering materials for daily covering, and there are many adverse effects: (1) Since sandy soil and clay are inert materials, they will not degrade with the passage of time, and the landfill (2) Since the sandy soil and clay are purchased from different places and transported to the landfill site, it is easy to cause economic waste such as operating costs; (3) To prevent the surface of the daily covering material from collecting water The daily coverage requires good permeability to the covering material, while the clay has a low permeability coefficient, which is not conducive to the infiltration of leachate during recharging. In addition, a stagnant layer of leachate is easy to form on the clay layer, which will increase The large pressure acting on the anti-seepage layer may also cause problems such as uneven settlement and landfill slope collapse.

At present, the materials of the intermediate covering layer are mainly clay and synthetic geotextile membrane, which have the following disadvantages: (1) clay has a large volumetric occupancy rate, which easily causes pressure on the storage capacity of the landfill; (2) the synthetic geotextile membrane and clay are purchased in different places And transported to the landfill site, it is easy to cause economic waste such as operating costs; the use of synthetic geotextile membranes requires higher construction technology and greater economic costs

In the prior art, the function of the filling for the closure and restoration of the landfill is single: the filling used in the exhaust layer is only porous and helps the function of gas inversion, the drainage layer only has water conductivity, and the function of the vegetation layer is mainly to utilize Vegetative growth provided by the enclosure cover provides a substrate

The overall ecological restoration function of the landfill has not been strengthened

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