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A method for purifying and treating cadmium-contaminated irrigation water in riverside constructed wetlands

A technology for artificial wetlands and purification treatment, applied in chemical instruments and methods, water pollutants, sustainable biological treatment, etc., can solve the problems of large floor space, poor stability, secondary pollution, etc., and achieve low construction costs and cost. Low, the effect of improving the ecological environment

Active Publication Date: 2021-02-09
INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Aiming at the current technical difficulties in the treatment of cadmium-contaminated irrigation water, such as large area, high cost, poor stability, and easy to cause secondary pollution, the purpose of the present invention is to provide a riverside constructed wetland system for purifying and treating cadmium-contaminated irrigation water. The method does not occupy farmland, has high removal efficiency, low operating cost, and is easy to operate and manage, and meets the need for purification of irrigation water sources in the restoration of heavy metal pollution in cultivated land

Method used

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  • A method for purifying and treating cadmium-contaminated irrigation water in riverside constructed wetlands
  • A method for purifying and treating cadmium-contaminated irrigation water in riverside constructed wetlands
  • A method for purifying and treating cadmium-contaminated irrigation water in riverside constructed wetlands

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Embodiment 1

[0027] A method for purifying and treating cadmium-contaminated irrigation water in a riverside constructed wetland, the steps of which are:

[0028] (1) Location selection: select a section of the river downstream of Ronghe Bridge with relatively gentle water flow, the length is about 85m, and the silted beach area is about 600 square meters. The end of the wetland is the intake of irrigation water.

[0029] (2) The river channel 8 is reinforced; according to the width of the water surface in the dry season, along the contour lines of the left and right sides of the river channel 8, the second retaining wall 7 is constructed with hemp stones and M7.5 mortar masonry according to the longitudinal slope of 1 / 400 to prevent flooding Scouring of constructed wetlands.

[0030] (3) Bank slope improvement; earthwork on the left bank to build a levee 1 to prevent flood overflow, with a length of 85m and a cross-section of 1m×1.5m. The slope on the left bank is 1:0.7; 2.5m×0.305m, us...

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Abstract

The invention discloses a method for purifying and treating cadmium-contaminated irrigation water in a riverside artificial wetland. The steps are: A. location selection; selection of a river section with relatively gentle water flow and relatively close to the irrigation water intake; B. river channel reinforcement; On the left and right sides of the river channel, masonry is used for reinforcement to retain the flood discharge function of the original channel; C, bank slope improvement; foundation reinforcement for the left and right embankments with masonry retaining walls; D, dredging of the river channel; Basement reconstruction; E. Wetland bed filling; layer-by-layer filling of quicklimestone, clinoptilolite, slag, river sand and soil from bottom to top; F. New submerged dam; build a submerged dam at the end of the artificial wetland and connect downstream Install prefabricated sand discharge holes in the middle of the river course and submerged dam; G, plant configuration; H, artificial wetland maintenance and management. It does not occupy farmland, has high removal efficiency, low operating cost, and is easy to operate and manage, meeting the needs for purification of irrigation water sources in the restoration of heavy metal pollution in cultivated land.

Description

technical field [0001] The invention belongs to the field of heavy metal pollution restoration and water purification treatment, and more specifically designs a method for purifying and treating cadmium-contaminated irrigation water in riverside artificial wetlands, which is suitable for the restoration of heavy metal-polluted cultivated land in southern my country, before the irrigation water enters the paddy fields It is an effective method to reduce heavy metal pollution such as cadmium in irrigation water with low cost, easy operation and management, through matrix adsorption and aquatic plant purification in constructed wetlands in the riverside zone. Background technique [0002] On April 17, 2014, the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that the rate of soil points exceeding the standard in cultivated land in my country was 19.4%, and the proportion of points w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F101/20
CPCC02F3/32C02F2101/20Y02W10/10
Inventor 陈心胜黄道友朱捍华许超李旭谢永宏
Owner INST OF SUBTROPICAL AGRI CHINESE ACAD OF SCI
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