Gabion construction method for subsurface flow constructed wetland

Abstract

The invention discloses a gabion construction method for a subsurface flow constructed wetland. The method comprises the following steps of (1) gabion module construction, wherein a gabion module is composed of a surrounding net and a movable bottom net, the surrounding net is defined by four side nets, the movable bottom net is arranged on the bottom of the surrounding net, the upper part of thesurrounding net is open, a vertical tie bar is arranged on the joint of the two adjacent side nets, upper-layer transverse tie bars are connected with the upper ends of the side nets respectively, bottom-layer transverse tie bars are connected with the lower ends of the side nets respectively, a middle transverse tie bar is connected between each upper-layer transverse tie bar and the corresponding bottom-layer transverse tie bar on each side net, the number of the middle transverse tie bars is at least two, the transverse tie bars are used as scale indication of padding, and the distance between each two transverse tie bars is the height of each layer of the padding; (2) laying of the gabion module and padding loading, wherein the folded surrounding net of the gabion module is pulled up,then the bottom net is placed on the bottom of the surrounding net, placement of the gabion module is conducted from the slope bottom to the slope top, and the padding in the gabion module is loaded from bottom to top layer by layer. By means of the method, deformation of a gabion and gaps of the gabion module are prevented, the engineering construction efficiency is improved, the stability of wetland running is guaranteed, manual laying is not needed, and mechanical work is feasible.

Description

technical field [0001] The invention relates to a construction method for subsurface flow constructed wetlands, belonging to the technical field of constructed wetlands. Background technique [0002] After the sewage is treated by the sewage treatment station, the COD content of the effluent that meets the first-level standard for sewage discharge is also as high as 100mg / L, which is far greater than the value of the second-level standard for drinking water sources (COD≤20mg / L). In recent years, the constructed wetland ecosystem has been widely used in the fields of treating rural domestic sewage, mining wastewater, urban storm runoff pollution, and deep purification of tail water from sewage treatment plants. Secondary water quality standards for drinking water sources. Constructed wetland technology can respond to my country's current requirements for deepening the reform of the ecological civilization system, as well as the promotion and application of comprehensive rive...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of large laying engineering quantity, low installation efficiency and poor packing bed treatment effect existing in the existing artificial wetland laying packing process, the present invention proposes a fast laying, detachable, and efficient adsorption of nitrogen, phosphorus and water in water bodies. Heavy metal pollutants, the gabion construction method of the subsurface flow constructed wetland that is beneficial to the growth of plant roots

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