Terrace type composite vertical flow forest wetland and domestic sewage treatment method thereof

Abstract

The invention relates to a domestic sewage treatment method, in particular to a method for realizing a terrace type composite vertical flow forest wetland on a hillside land and applying the forest wetland to rural domestic sewage treatment. The method is characterized by comprising the following steps that: a hilly hillside land is changed into a terrace; the terrace is constructed to be a terrace type composite vertical flow constructed wetland 3; plants and fillers of the terrace wetland 3 are the same as those of the conventional constructed wetland, but an upper level of the terrace wetland 3 is communicated with a lower level of the terrace wetland 3 through a forest surface flow wetland 4; and sewage is over-flown into the forest surface flow wetland 4 through downward flow wetland 31 and upward flow wetland 32 of the upper level of the terrace wetland 3, and enters the next level of the terrace wetland 3 for further treatment through the forest surface flow wetland 4. The invention has the advantages of high purification rate and adaptability, convenience of management, low cost, is easy to implement and is particularly suitable for rural domestic sewage treatment in hilly areas.

Description

technical field [0001] The invention relates to a domestic sewage treatment method, in particular to a terraced compound vertical flow forest wetland and a method for treating rural domestic sewage. Background technique [0002] Pollution of drinking water sources is one of the major environmental and public safety issues facing our country. Most of the domestic sewage in the water source reservoir area is directly discharged into the streams entering the reservoir without any treatment, which is an important cause of water source pollution. The development of economical, effective, simple and applicable domestic sewage treatment methods suitable for water source reservoir areas has important practical significance for the protection of drinking water sources. Compared with urban domestic sewage, domestic sewage treatment in water source areas has the following characteristics: (1) There are many points, wide area, small volume, and scattered, making it difficult to achieve ...

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Problems solved by technology

[0003] (1) Constructed wetlands usually occupy a large area, but because most of the water source reservoir areas are located in hilly areas, most of the available land is slope land, and the constructed wetlands in the form of forest surface flow cannot meet the hydraulic retention time required for sewage treatment , so trying to prolong the hydraulic retention time is the primary problem faced by constructed wetlands in water sources;

[0004] (2) The main way to remove nitrogen in constructed wetlands is the nitrification and denitrification of microorganisms, but the nitrification process is often incomplete due to lack of oxygen in constructed wetlands, and the denitrification process is incomplete due to insufficient available C sources, thus Affects N removal efficiency

It is generally believed that nitrogen removal includes substrate adsorption, filtration, precipitation, and nitrogen volatilization, plant absorption, and microbial nitrification-denitrification, in which microbial nitrification-denitrification plays a major role; the DO content in sewage has an important effect on nitrification The role is very important. When dealing with sewage with high ammonia nitrogen content, insufficient DO is often caused by insufficient nitrification, and ammonia nitrogen cannot be fully converted into nitrate nitrogen and industrial nitrate nitrogen, which are raw materials for denitrification, which limits the nitrogen removal capacity of wetlands.

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