Impermeable material based on flue gas desulfurization byproduct and usage in garbage landfill thereof

Abstract

The invention discloses an impermeable material based on flue gas desulphurization by-product and the usage in trash burying. The impermeable material is compounded evenly according the weight by 60-90 percent of circulating fluidized bed flue gas desulphurization dreg and 10-40 percent of chemical additive under the dried powder ugh condition. The chemical additive is the one kind or two kinds of combination of bentonite and kleit at random proportion, and the impermeable material can be applied to be used as an anti-seepage layer in trash burying, wherein, the anti-seepage layer used as the underlay of the trash burying field has a thickness of 80cm to 120cm; the anti-seepage layer used as the intermediate coating has a thickness of 15cm to 30cm; and the anti-seepage layer used as the full closure field has a thickness of 60cm to 100cm. The impermeable material can not only prevent from polluting the underground water of the trash burying field, reduce the treatment of trash infiltrated liquid and ensure that the trash buried gases are collected orderly, but also make full use of the huge desulphurization dreg and change waste into resources, thereby realizing the win-win benefit.

Description

technical field [0001] The invention relates to the resource utilization of by-products of flue gas desulfurization in a circulating fluidized bed, in particular to an anti-seepage material based on the by-products of flue gas desulfurization in a circulating fluidized bed and its use in landfills. technical background [0002] The circulating fluidized bed flue gas desulfurization technology has the advantages of adapting to a wide range of coal types, low investment and operating costs, small footprint, and low water consumption, and its popularization and application are becoming more and more widely used. However, how to utilize the desulfurization residue, the by-product of desulfurization, has always been a major problem in circulating fluidized bed flue gas desulfurization technology. [0003] At present, the treatment of by-products of CFB FGD in China is still dominated by discarding and stacking, which not only occupies a large amount of land resources, but also wa...

AI Technical Summary

Problems solved by technology

The cost of high-density polyethylene film is relatively high, and the price per square meter is about 40 yuan, which has caused a great economic burden on the huge landfill

If natural clay is used as the anti-seepage layer, the amount of clay required for a large and medium-sized landfill is too large, and it is difficult to obtain a sufficient amount of natural clay

In the actual landfill process, some landfills are covered with gravel soil stored during liquidation, but the permeability coefficient of gravel soil is about 1.0×10 -4 cm / s, which is far greater than that stipulated in the "Technical Specifications for Domestic Garbage Sanitary Landfill" that "the permeability coefficient of natural clay and modified clay anti-seepage layers should not be greater than 1.0×10 -7 cm / s", causing a large amount of rainwater to seep into the landfill leachate, resulting in a substantial increase in the amount of landfill leachate that needs to be treated

[0006] It can be seen that, in the treatment of the by-products of CFB flue gas desulfurization and the construction of the anti-seepage layer of sanitary landfills, on the one hand, there is no effective resource utilization method for the by-products of CFB flue gas desulfurization. As a result, a large amount of desulfurization slag is discarded and piled up; on the other hand, the sanitary landfill of garbage cannot obtain sufficient and cheap anti-seepage materials

So far, there is no recycling treatment plan for the by-products of circulating fluidized bed flue gas desulfurization that combines the above two factors