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Aquatic plant collocation planting method to reduce heavy metals in river surface runoff

An aquatic plant and surface runoff technology, applied in the treatment of polluted waterways/lakes/ponds/rivers, water pollutants, sustainable biological treatment, etc. Nutritious, high aesthetic value effects

Active Publication Date: 2017-01-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the face of large flowing area sources and complex ecosystems, the physical method has exposed its limitations.

Method used

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  • Aquatic plant collocation planting method to reduce heavy metals in river surface runoff
  • Aquatic plant collocation planting method to reduce heavy metals in river surface runoff
  • Aquatic plant collocation planting method to reduce heavy metals in river surface runoff

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The test platform is built to simulate static shallow water, the length and width are 3×2(m), the bottom sediment depth is 0.5m, and the water depth is 0.7m. The planting density of emergent plants is 16 plants / m 2 , the planting ratio of calamus and reed is 1:2; the planting density of submerged plants is 48 clumps / m 2 , the planting ratio of Echinacea microphylla, black algae, chrysanthemum, and foxtail algae is 1:2:3:1; the planting density of water hyacinth is 15 plants / m 2 . Cultivate the selected aquatic plants, and transplant them to the experimental platform when they are mature.

[0016] Taking heavy metals Cr, As, Cd, Pb, Hg and V as test objects, heavy metal mixed solutions A and B were prepared. A, B solution contains each metal concentration:

[0017]

[0018] After cultivating for 50 days, use the graphite furnace atomic absorption method to measure the concentration of each metal in the water. The heavy metal contents of solutions A and B are as fo...

Embodiment 2

[0023] Select the watershed 20 meters from the intersection of a certain stone coal vanadium mine sewage outlet and the upper reaches of the river as the implementation site, plant emergent plants calamus and reeds on the shore, with a planting ratio of 1:1; plant water hyacinth on the river surface, and use ecological floating beds Fixed, the planting distance is 45cm; the river bottom is planted with submerged plants, such as submerged plants, black algae, chrysanthemum, and foxtail, and the planting ratio is 1:1:4:2; the planting density is 35 clumps / m 2 . Take raw water samples and use graphite furnace atomic absorption method to measure the content of heavy metals Cr, As, Cd, Pb, Hg, V. After two months of testing, take water samples again to measure the heavy metal content in the treated water. The result is as follows:

[0024] heavy metal As (μg / L) Cd (μg / L) Cr (μg / L) Pb (μg / L) V(μg / L) Hg(μg / L) before processing 7.9 17.8 1.7 3.7 18.6 8....

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Abstract

The invention provides a method for reducing heavy metals in river-going overland runoff by aquatic plant matched growth, belonging to the technical field of heavy-metal-polluted river course restoration. According to the method, emerging plants calamus and reed, submerged plants Potamogeton pusillus, hydrilla, curly pondweed and watermilfoil, and floating plant common waaterrthacinth are grown from the riverbank to the river center. The growth density of the emerging plants is 10-20 plants / m<2>, and the growth proportion of the calamus and reed is 1:(1-3); the growth density of the submerged plants is 30-50 clumps / m<2>, and the growth proportion of the Potamogeton pusillus, hydrilla, curly pondweed and watermilfoil is 1:(1-2):(3-5):(1-2); and the growth density of the floating plant common waaterrthacinth is 10-20 plants / m<2>. The plant growth process is utilized to absorb and enrich heavy metal ions in water, thereby achieving the goal of restoring the river-going multi-heavy-metal combined pollution river course. The method has the advantages of small secondary pollution, simple restoration process, low cost and the like, and can maintain the balance of the ecological system in water. The method for treating the polluted river course has environmental value, ecological value and ornamental value.

Description

technical field [0001] The invention relates to the technical field of heavy metal-polluted river course restoration, in particular to a method for reducing heavy metals in river surface runoff by planting aquatic plants together. Background technique [0002] With the rapid development of high-tech fields, the demand for vanadium is increasing, and the harm to the environment is also becoming more and more prominent. At present, the production wastewater and waste residue in the process of extracting vanadium will contain a certain concentration of high-priced vanadium, which will be directly discharged into the water body, causing serious pollution to the surrounding water environment, and causing harm to animals, plants, and human health. [0003] The problem of heavy metal pollution in my country's water is very prominent, and the discharge sources of water pollutants are mainly concentrated in large and medium-sized cities and industrially developed areas. The increasi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32
CPCC02F3/327C02F2101/20C02F2103/007Y02A20/402Y02W10/10
Inventor 董颖博林海陈思王亮
Owner UNIV OF SCI & TECH BEIJING
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