A coal gangue-automatically modified zeolite composite filler artificial wetland system

Abstract

The invention relates to a coal gangue and automatic modified zeolite composite filler artificial wetland system. Artificial wetland composite filler containing coal gangue, zeolite and gravel filler is adopted, the thickness of the filler layer is 1.0 m or more, and the filler sequentially comprises planting soil, coal gangue, zeolite, gravel and a geomembrane. The pH value index of coal gangue filler layer filtered water is controlled by adjusting retention time and flow speed of sewage in the coal gangue filler layer on different water quality conditions, weak-acid filtrate directly acts on a lower zeolite filler layer, zeolite filter can be modified automatically, and the pollutant removal effect of the zeolite filler layer is effectively improved. A large-particle-diameter reverse grading filler technology is adopted, while surface layer filler blocking is effectively relieved, the capacity for treating and containing pollutants in the sewage of the modified zeolite layer is improved, the anti-blocking period of an artificial wetland is prolonged, and the use ratio of coal gangue is increased.

Description

technical field [0001] The invention relates to a coal gangue-automatically modified zeolite composite filler artificial wetland system, which can realize the resource utilization of coal gangue while alleviating the blockage problem of the underflow artificial wetland filler layer. Background technique [0002] Constructed wetland technology has been widely used in various sewage treatment and river ecological improvement projects due to its advantages such as low construction and operation costs and simple management, and has achieved good operational results. However, after many years of operation of constructed wetlands, it has been found that the wetland filling layer will gradually clog with the operation time, resulting in the reduction of the wetland cross-section, the reduction of the treatment water volume and the decline of wetland treatment efficiency. One of the main factors of application and promotion in our country. [0003] Zeolite, especially modified zeol...

AI Technical Summary

Problems solved by technology

However, after many years of operation of constructed wetlands, it has been found that the wetland filling layer will gradually clog with the operation time, resulting in the reduction of the wetland cross-section, the reduction of the treatment water volume and the decline of wetland treatment efficiency. One of the main factors of application and promotion in our country

[0003] Zeolite, especially modified zeolite, has been widely used in various water treatment projects due to its good porous physical structure, but it cannot be used in constructed wetlands due to its high engineering cost and complicated prefabricated modification process. wide application

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