In-situ step enhanced combined purification system applicable to slow flow type river

Abstract

The invention provides an in-situ step enhanced combined purification system applicable to a slow flow type river. The in-situ step enhanced combined purification system is formed through the following steps: constructing a percolation dam for intercepting a water body step by step, reducing the flow velocity of the water body and promoting preliminary sedimentation of sediments, floating objectsand suspended matters in the water body; constructing a stabilization pond for settling large-particle-size suspended matters in the water body; constructing an ecological percolation island at the tail end of the stabilization pond, wherein the ecological percolation island is used for removing small-particle-size suspended matters in the water body; constructing a surface flow wetland for removing inflowing suspended matters in the water body, and increasing the transparency of the water body, wherein the percolation dam, the stabilization pond, the ecological percolation island and the surface flow wetland form a four-stage interception system; and constructing shoreside plant zones in areas at two sides of a riverway located at the tail end of the surface flow wetland, wherein the shoreside plant zones and the above four-stage interception system form the five-stage purification system. By constructing the four-stage interception system, the silting risk of the riverway is reduced,and the stability of the structure and the functions of a riverway ecological system is guaranteed; meanwhile, through the five-stage purification system, water is fully purified, the quality of water entering a river is guaranteed to reach the standard, and the purification function of the riverway is improved.

Description

technical field [0001] The invention belongs to the technical field of ecological engineering, and in particular relates to an in-situ step-enhanced purification combination system suitable for slow-flow rivers. Background technique [0002] With the rapid development of population and social economy, the problem of water pollution in our country is becoming more and more serious. Among them, in the process of urbanization, there are many artificially excavated rivers. This type of river is mainly used to receive urban life, industrial tail water, urban rainwater pipe network system, farmland irrigation around towns, and rivers that are not connected to the pipe network. The direct discharge of sewage, the inflow of non-point sources in the river bank and other water bodies, resulting in high suspended solids in the river water body, substandard water quality of the river water body, and a large amount of domestic garbage. What's more, due to the increasing discharge of pol...

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Problems solved by technology

[0004] In my country, due to the late start of theoretical research and application of constructed wetland technology, there are still many imperfections at this stage. At the same time, due to environmental differences and conditions in different regions, a set of constructed wetland construction standards cannot effectively solve various environmental pollution problems. , requiring the development of different governance and restoration models tailored to local conditions

[0005] According to patent and literature searches, the removal of suspended solids in water at home and abroad is mainly focused on device research, such as flocculants, sieve plates, filter screens, etc., which have remarkable effects on the flocculation, filtration and settlement of suspended solids, but for large-area water bodies such as rivers. limitation

At the same time, many artificial wetlands under construction at this stage do not effectively consider the removal of suspended solids, resulting in blockage of wetland systems and loss of wetland system functions.

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