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Method for remediating heavy metal cadmium contaminated water by using clonality of wetland clone plant

A technology for cadmium pollution and heavy metals, applied in the field of environmental ecology, can solve problems such as unsatisfactory restoration results, and achieve the effects of restoring and protecting river ecology and service functions, improving ecological environment, and beautifying landscapes

Active Publication Date: 2017-01-04
BEIJING FORESTRY UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a large number of researches at home and abroad use cloned plants to restore and rebuild wetland vegetation, the technology used does not fully consider the special life history characteristics of cloned plants, so the restoration effect is not ideal.

Method used

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  • Method for remediating heavy metal cadmium contaminated water by using clonality of wetland clone plant
  • Method for remediating heavy metal cadmium contaminated water by using clonality of wetland clone plant
  • Method for remediating heavy metal cadmium contaminated water by using clonality of wetland clone plant

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0030] Experimental Example 1 Determination of target species

[0031] Through greenhouse control experiments, a wetland plant with strong tolerance and enrichment ability to the heavy metal cadmium in water was screened out, and the species could spread and multiply rapidly in the shallow water area of ​​the river (lake) bank. We collected a total of 15 species of native wetland plants with wide natural distribution in typical wetlands in Beijing (Beisha River, Miyun Reservoir, Jinniu Lake, etc.), brought them back to the greenhouse for cultivation, and artificially added cadmium solution (4 mg L -1 ) for 1 month. After treatment, the survival rate of each species was recorded, and the cadmium enrichment in the aerial parts of the plants was determined.

[0032] Experimental results: as shown in Table 1. Paspalum chinensis, cocklebur, reed, cress, foxtail, Digi, sorrel, oxtenoid, etc. have higher enrichment amounts of cadmium, and at low concentrations (4 mg L -1) under ca...

experiment example 2

[0037] We further carried out the following greenhouse experiments to answer the three key questions in "Example 1" through reasonable experimental design and accurate experimental analysis. The specific experimental steps are as follows:

[0038] (1) intercepting the branches formed by clonal plant Paspalum bisplenica through asexual reproduction, and adopting the method of layering to cultivate, cultivate 8 mature nodes and the stolon fragments of the young apex, so that each mature node grows roots ;

[0039] (2) Construction of a net-type floating bed: Use ordinary fishing nets (mesh type: 6 strands of 2 cm) as the floating bed net, the floating bed frame is composed of rigid pvc pipes with a hole diameter of 1 cm, hollow and sealed, and each floating bed unit is 32 × 20 cm long. In practical large-area applications, the four corners of the bed should be fixed with a sealed hollow plastic floating box, and the floating box should be fixed on the shore pile;

[0040] (3) ...

Embodiment 1

[0063] Simulation of remediation of cadmium-contaminated wastewater discharged from industry. Use CdCl 2The solution is configured with industrial wastewater, and the industrial wastewater is isolated into a wastewater pool, where the concentration of cadmium is 4 mg L -1 .

[0064] Make the cloned plant Paspalum chinensis cultivated to produce a large number of branches through asexual reproduction; cut off the branches, and carry out layering planting on the pond bank of the waste water pond with a plant spacing of 15cm, until it grows 20 cm on the pond bank. The stolon fragments of each mature node and the young apex, after each mature node grows roots and forms a network structure, guide the plant apex to crawl to the water surface of the waste pool, and construct a net floating bed on the water surface: use ordinary fishing nets (mesh type : 6 strands of 2 cm) as a floating bed net, the floating bed frame is composed of rigid pvc pipes, hollow and sealed. Make the plan...

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Abstract

The invention belongs to the field of environmental ecology and particularly relates to a method for remediating heavy metal cadmium contaminated water by using clonality of a wetland clone plant. The method comprises steps as follows: the clone plant, namely, paspalum paspaloides, is planted on the bank side of the cadmium contaminated water, the tip of the plant is placed in the cadmium contaminated water after being planted, so that the plant grows in a creeping manner and branches on the water surface to form a netted structure; the plant and ramets on the bank side form a connected stolon network system; the paspalum paspaloides plant on the water surface is mowed regularly. With the adoption of the method, under the clone integration action of ramets on the bank side and ramets on the water surface, cadmium ions in the cadmium contaminated water can be removed effectively, the heavy metal cadmium contamination condition of wetland water is relieved, the ecological environment of wetland is improved, the wetland landscape is beautified, and the wetland ecology and service functions are restored and protected effectively.

Description

technical field [0001] The invention belongs to the field of environmental ecology, and in particular relates to a method for utilizing the clonal traits of cloning plants in wetlands to promote their rapid propagation in heavy metal cadmium-polluted water bodies for vegetation restoration and reconstruction, and the method can reduce the heavy metal cadmium pollution in wetland waters. , improve the wetland ecological environment, beautify the wetland landscape, and effectively restore and protect the wetland ecology and service functions. Background technique [0002] Wetlands are known as the "kidneys of the earth" and have many ecological and service functions such as regulating climate, purifying water bodies, conserving water sources, beautifying the environment, and maintaining biodiversity. However, in recent years, with the rapid development of society and economy, the interference of human activities on the wetland ecosystem has become increasingly intensified, the...

Claims

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Application Information

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IPC IPC(8): C02F3/32C02F101/20
CPCC02F3/32C02F2101/20C02F2103/007Y02W10/10
Inventor 罗芳丽于飞海邢亚萍魏冠文董必成冀春雷张春禹赵晋灵王自力蔡飞徐军
Owner BEIJING FORESTRY UNIVERSITY
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