Active-matrix-reinforced underflow constructed wetland device

Abstract

The invention provides an active-matrix-reinforced sub-surface flow constructed wetland device and belongs to the technical field of environmental protection. The device comprises a wetland groove and a water-drop aeration step, wherein an opening which is arranged at the front end of the wetland groove is used as a water inlet, an opening which is arranged at the rear end of the wetland groove is used as a water outlet, and the upper end of the water-drop aeration step is connected with the water outlet of the wetland groove. Different pollutant purification functional regions are arranged in the device by segments, and different segments are filled with different active matrixes and equipped with corresponding process conditions so as to comprehensively and greatly improve the efficiency of treating pollutants in slightly-polluted water.

Description

technical field [0001] The invention relates to a device in the technical field of environmental protection, in particular to an active matrix reinforced artificial subsurface flow wetland device. Background technique [0002] With the continuous and rapid development of our country's social economy, the environmental problems are becoming more and more serious. The protection of water environment and the safety of drinking water sources are already a very urgent task in our country. In this context, the environmental protection department currently requires sewage treatment plants in various places to be upgraded to the first-class A standard, so that the treated tail water can be discharged into non-closed water bodies, such as the Yangtze River. However, even if the tail water reaches the first grade A standard, it is still inferior to the fifth grade water quality according to the national surface water standard, which will cause eutrophication of closed water bodies. I...

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Problems solved by technology

The disadvantages of this technology are: 1) there is no active matrix for adsorbing nitrogen in the filled matrix layer, and a high-concentration zone of nitrogen cannot be formed, so the nitrogen removal rate is slow; 2) although the coarse-grained layer with high permeability coefficient is easy to form aerobic environment, and the medium particle size layer with low permeability coefficient is easy to form an anaerobic environment, but because there is no artificial oxygen supply, the coarse particle size layer behind the medium particle size layer will not actually show a good aerobic state ; 3) The matrix layers of different particle sizes and materials are filled in layers and the filling methods of different shapes (trapezoidal and inverted trapezoidal) are used to bring inconvenience to the construction and maintenance after construction; 4) Although the high-efficiency dephosphorization layer is kneaded, the Relying on the rich iron and aluminum ions contained in it to promote the formation of flocculation and precipitation of phosphorus in sewage, the flocculation and precipitation will soon cause clogging as the operation time goes by

Moreover, the formation of flocculation precipitation requires a high concentration of reactants. If the concentration of phosphorus in sewage is low, but it still pollutes the environment, the effect of phosphorus removal is bound to be limited.

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