Novel in-situ double-sealing treatment process for full-amount recycling of landfill leachate

Abstract

The invention belongs to the technical field of harmless treatment of refuse landfills, and particularly relates to a novel in-situ double-sealing treatment process for full-amount recycling of landfill leachate. The in-situ double-sealing treatment process comprises a sealing slurry, a mixing ratio of the sealing slurry, and a slurry preparation and spraying sealing process. The sealing slurry comprises power plant furnace bottom slag or mineral slag, mixed grinding ash, cement and curing agent powder. The slurry preparation and spraying sealing process comprises the following steps: S1, pre-drying the power plant furnace bottom slag or mineral slag, and adding the pre-dried power plant furnace bottom slag or mineral slag into a large stirrer of a stirring station arranged at a proper position of a refuse landfill; S2, extracting the landfill leachate from a landfill leachate pool, adding the landfill leachate into a stirrer, and stirring for 3-6 min; S3, sequentially adding the mixed grinding ash, the cement and the curing agent into a stirrer through automatic metering according to the matching amount, and stirring for 2-3 min; and S4, unloading the uniformly stirred slurry into a spraying vehicle through the stirrer, and pulling to a garbage yard for spraying and covering the garbage.

Description

technical field [0001] The invention belongs to the technical field of innocuous treatment of landfills, and particularly relates to a new process for in-situ double-sealing treatment for full-quantity recycling of landfill leachate. Background technique [0002] Landfill leachate is a kind of water containing a large amount of heavy metals, ammonia nitrogen, organic matter, harmful bacteria and other substances formed by the water contained in the garbage itself in the landfills, rainwater and other water entering the landfill garbage through landfill infiltration. Hazardous wastewater has the characteristics of large amount, strong hazard and difficult to treat, which has caused serious threat to the environment; however, there is no technology that can fully quantify, harmless and recycle it; how to develop it as soon as possible It has become a top priority to develop new technologies that can fill this gap to meet the urgent needs of environmental protection. [0003] ...

AI Technical Summary

Problems solved by technology

Its serious shortcomings are: large investment, large land occupation, high operating costs, long construction period, limited treatment capacity, and cannot handle the increasing amount of landfill leachate, resulting in a large accumulation of landfill leachate.

Although this patent application uses the solidified base material and the concentrated landfill leachate to make slurry and spray to cover the working surface of the landfill, the formed hard film reduces the infiltration of rainwater into the garbage and reduces the generation of a certain amount of landfill leachate , has certain technical progress, mainly solves the problem of treating the landfill leachate concentrate and makes the landfill leachate have a reduction effect, but this patent obviously has the following major shortcomings: First, it can only deal with landfill leachate concentration However, the raw liquid of landfill leachate cannot be treated, and the raw liquid still needs to be filtered by traditional biochemical and membrane methods, which has not fundamentally solved the problem of landfill leachate treatment, and has not achieved full quantitative treatment.

The second is that it violates the principle of in-situ treatment of landfill leachate, and adopts the method of transporting to a membrane filtration plant for off-site treatment, which causes new pollution during transportation and treatment.

The third is that its solidification coverage of the garbage dump is limited to part of the working surface, but it cannot fully cover the slope surface and the storage area over the years to prevent rain, and the reduction of landfill leachate is limited.

The reason is that the amount of concentrated liquid is small, and the slurry made to cover the garbage is also small, which is not enough to cover a large area of ​​garbage, and it does not solve the problem of landfill leachate increasing due to rainwater and the problem of full resource utilization of landfill leachate

The fourth is that the core material posi-shell and the slurry spraying machine in its curing base material are supplied by the American LSC company, which is controlled by foreign countries. Once a neck jam like Huawei chips occurs, production will stagnate, and the core technology is not available. Localization

To sum up, this patent cannot fully recycle landfill leachate in situ, nor can it reduce the amount of landfill leachate on a large scale, and has many shortcomings.

Images