Refuse landfill sealing top layer and preparation method and application thereof

Abstract

The invention discloses a refuse landfill sealing top layer and a preparation method and application thereof, and belongs to the technical field of landfill. The sealing top layer comprises at least three functional layers, the functional layers comprise a water storing layer, a guiding discharging layer and a low-permeability layer which are successively stacked from outside to inside, and the water storing layer is mainly composed of recycled fine aggregates with the particle size less than 5 mm; the guiding discharging layer is mainly composed of recycled coarse aggregates with the particlesize between 10 mm-40 mm; the low-permeability layer is mainly composed of natural soil; the processing of building rubbish is conducted to obtain the recycled fine aggregates and the recycled coarseaggregates. The sealing top layer is composed of the above particle size combinations of the recycled building rubbish aggregates and the natural soil, the seepage-proofing and leakage stopping functions are effectively achieved, rubbish is filled with rubbish, the recycle of the building rubbish is achieved, the capacity occupied by the building rubbish in a landfill is released, and compared with a traditional soil sealing top layer, the refuse landfill sealing top layer has the advantages that the consumption of soil resources is greatly reduced, the construction is simple, raw materials can be conveniently obtained, the cost is low, and the durability is good.

Description

technical field [0001] The invention relates to the field of landfill technology, in particular to a landfill topping layer and a preparation method and application thereof. Background technique [0002] In recent years, with the continuous and rapid development of my country's national economy and the acceleration of urbanization, urban solid waste has also shown a sharp increase. According to the "Report on the Implementation of the Law of the People's Republic of China on the Prevention and Control of Environmental Pollution by Solid Wastes", my country's urban solid waste generation continues to grow, and the situation of solid waste pollution prevention and control is becoming increasingly severe. Among them, construction waste alone produces about 1.8 billion tons in my country every year. , 2 / 3 of the large and medium-sized cities in the country are in a situation of "garbage siege". [0003] The treatment methods of municipal solid waste are mainly divided into landf...

AI Technical Summary

Problems solved by technology

The covering layer needs to use a large amount of natural soil or artificial soil materials, which will cause difficulties in obtaining materials and exacerbate the shortage of soil resources; in addition, a large amount of soil resources need to be transported and allocated from outside, which increases the construction cost of the covering layer

[0009] (2) The covering material is not green and environmentally friendly, and the construction waste in the landfill cannot be fully utilized

A large amount of solid waste in the landfill is construction waste, and construction waste is simply landfilled instead of recycled. On the one hand, it causes a lot of waste of resources. On the other hand, a large amount of construction waste occupies the storage capacity of the landfill and reduces the economy of the landfill. benefit and social benefit

[0010] (3) Occupying the storage capacity of the landfill

Obviously, the soil cover will greatly occupy the storage capacity of the landfill, thereby reducing the actual amount of landfill waste and reducing the economic and social benefits of the landfill.

[0011] (4) Affect the stability of garbage body

[0014] However, in this patent, domestic waste incineration slag and gravel are used as materials for the exhaust layer and drainage layer, and the exhaust layer and drainage layer are not functional layers for preventing seepage and air sealing, but only for dredging. Therefore, the domestic waste incineration in this patent Slag is not the main functional material for constructing the covering layer. In practice, the patented solution still needs to use a large amount of natural soil resources

On the other hand, domestic waste incineration slag and gravel are used as materials for the exhaust layer and drainage layer. In terms of functional requirements, only the permeability coefficient is required, and there are no other special requirements; It is extremely complex, and the morphology, composition, physical, mechanical, chemical and other characteristics of the slag produced after incineration are not good, and the final field covering system obtained by the construction is not good in anti-seepage and air-tight effect

On the other hand, in this scheme, the vegetation layer is included in the functional layer of the covering layer, and the thickness is relatively thin (vegetation layer is only 20-30cm), so the water storage capacity of the vegetation layer is small, and then causes this patent scheme to have more rainfall. Not suitable for wet areas

Images