Method for reducing nitrogen and phosphorus pollution of water body by transforming marsh lands in riparian zones and reservoir bank zones

A technology for riparian zones and depressions, applied in the field of river ecological restoration, can solve problems such as danger, impact on the landscape and ecosystem functions of riparian zones and reservoir zones, and achieve the goals of convenient operation, improvement of biodiversity and ecological functions, and optimal configuration Effect

Inactive Publication Date: 2017-12-26
WUHAN BOTANICAL GARDEN CHINESE ACAD OF SCI
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Problems solved by technology

These depressions are mostly composed of exposed gravel and river sand, which not only seriously affects the landscape and

Method used

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  • Method for reducing nitrogen and phosphorus pollution of water body by transforming marsh lands in riparian zones and reservoir bank zones

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Embodiment 1

[0034] A method for transforming riparian and reservoir bank depressions to reduce nitrogen and phosphorus pollution in water bodies, the steps of which are:

[0035] 1. Depression shape transformation: select 5 depressions 2 that are relatively close to each other on the reservoir bank, and keep the average depth of depressions 2 at about 1m through excavation or landfilling. The deepest depression 2 does not exceed 1.5m, and the average area of ​​depressions 2 55m 2 .

[0036] 2. Connection of depression water system: connect depression 2 with adjacent river channels by digging ditches or laying concrete culverts, so that the river water flowing in by gravity can flow freely in depression 2 system and be discharged into the reservoir through ditch 1. Ditch 1 has a width of 50cm and a depth of no more than 0.5m; the inner diameter of the culvert is 40cm.

[0037] 3. Restoration of the base of the depression: Lay a gravel layer 5 with a thickness of about 10cm in the lower l...

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Abstract

The invention discloses a method for reducing nitrogen and phosphorus pollution of a water body by transforming marsh lands in riparian zones and reservoir bank zones. The method comprises the following steps: S1, transforming landform of marsh lands, namely selecting multiple marsh lands, excavating or landfilling to enable the average depth of the marsh lands to be 0.8-1.0m; S2, communicating water systems of the marsh lands, namely communicating adjacent marsh lands, and communicating the marsh lands with the upstream of a river channel; leading river water to freely flow into the marsh lands, and draining the marsh land purified river water into the downstream of the river channel; S3, repairing the substrates of the marsh lands, namely laying gravel layers and fine sand layers sequentially from bottom to top in the marsh lands, and uniformly adding denitrified long-acting carbon source and phosphorous adsorbent in the fine sand layers; S4, restoring the aquatic plant community; and S5, dosing benthonic animals. The method is simple and feasible, has the advantages of low energy consumption, low cost and the like, and can be widely applied to the technical field of river ecology restoration.

Description

technical field [0001] The invention relates to the technical field of river ecological restoration, and more specifically, the invention relates to a method for transforming depressions in riparian zones and reservoir bank zones to reduce nitrogen and phosphorus pollution in water bodies. Background technique [0002] With the rapid development of industrialization and urbanization in recent decades, most of the rivers in the central and eastern regions of my country have been polluted to varying degrees, and all rivers are facing ecological problems such as deterioration of water environment quality, decline of aquatic biodiversity, and decline of ecosystem functions. . Nitrogen and phosphorus pollutants are currently the main pollutants in most rivers in China. Excessive nitrogen and phosphorus concentrations in the water body will lead to a decline in river water quality, endanger the quality of the aquatic ecological environment, and have a high risk of eutrophication a...

Claims

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Application Information

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IPC IPC(8): C02F9/14E02B3/00
CPCY02A20/402C02F9/00C02F1/281C02F3/327C02F3/34C02F2101/105C02F2101/16C02F2103/007C02F2209/16C02F2305/06E02B3/00
Inventor 刘文治王娟刘贵华
Owner WUHAN BOTANICAL GARDEN CHINESE ACAD OF SCI
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