Construction method of high-efficiency denitrification type horizontal underflow wetland

Abstract

The invention discloses a construction method of a high-efficiency denitrification type horizontal underflow wetland. The construction method comprises the steps of cleaning a riverbed, mixing materials, paving the materials, cultivating plants, inserting ventilating pipes and the like. The construction method comprises the detailed steps of leveling a river channel which is used for discharging sewage previously, then paving a mixture layer of marble cobbles and iron-ore slag, planting willows or metasequoia on the mixture layer, then paving a layer of rubber particles, and finally inserting a plurality of ventilating pipes to finish construction of the high-efficiency denitrification type horizontal underflow wetland. The construction method disclosed by the invention has the advantages that a better oxygen supplying mechanism is provided and is beneficial to growth and propagation of aerobic bacteria and ammonia-nitrogen transformation; simultaneously, a low-oxygen growth environment is provided for anaerobic bacteria by utilizing a saturated layer, and a carbon source is provided for bacteria by a developed root system of woody plants, therefore, by function combination of the saturated layer and the woody plants, the denitrifying function of the wetland is enhanced; in addition, the iron-ore slag at the lower layer can be used for adjusting pH of a waste water system; and since the willows or the metasequoia are also planted, the absorbing capability and the purifying capabilities of nitrogen-phosphorus waste water are further improved.

Description

technical field [0001] The invention relates to the field of environmental science and engineering, in particular to a construction method of a high-efficiency denitrification horizontal subsurface flow wetland. Background technique [0002] The production and use of a large amount of nitrogen- and phosphorus-containing fertilizers in agricultural production, as well as the discharge of industrial wastewater such as food and animal product processing and urban domestic wastewater, especially the sewage generated by phosphorus-containing detergents are discharged into rivers without treatment, making river water Rich in nitrogen, phosphorus and other plant nutrients, resulting in eutrophication of water bodies. In eutrophic water bodies, due to sufficient nutrients, algae and other phytoplankton multiply, thereby excessively consuming oxygen in the water, causing the death of other aquatic plants and animals, and destroying the ecological balance. Therefore, measures must be...

AI Technical Summary

Problems solved by technology

In the Chinese patent CN104032707A "a construction method for high-efficiency nitrogen and phosphorus removal horizontal subsurface flow wetlands", marble shavings, middle matrix and marble shavings are laid in sequence from bottom to top, and aquatic plants reed or cattail perennial root are planted to remove nitrogen and phosphorus pollution The patent provides an environment for the growth and reproduction of microorganisms by laying three layers of substrates, uses nitrifying bacteria and nitrosating bacteria to remove nitrogen, and uses aquatic plants to further improve the treatment capacity of nitrogen and phosphorus wastewater. However, this patent is actually applied to constructed wetlands During construction, there are still the following disadvantages: the aerobic environment for the growth and reproduction of microorganisms is not ideal, and they are often under anaerobic conditions; the pH value of the wastewater system is not suitable for the growth and reproduction of microorganisms; the nitrogen and phosphorus wastewater treatment capacity of aquatic plant reeds or cattail perennial roots weak