Method for repairing heavy metal pollution in culture pond bottom mud

A technology for breeding ponds and heavy metals, applied in the restoration of polluted soil, etc., can solve problems such as poor results, and achieve remarkable effects, low cost, and simple operation methods

Inactive Publication Date: 2018-11-02
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a method for repairing the heavy metal pollution in the bottom mud of the breeding pond, so as to solve the problems of poor effect in the prior art

Method used

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  • Method for repairing heavy metal pollution in culture pond bottom mud
  • Method for repairing heavy metal pollution in culture pond bottom mud
  • Method for repairing heavy metal pollution in culture pond bottom mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Use passivation agent to restore heavy metals Cd, Cu, As in sediment, the specific method is as follows:

[0035] The first step is to drain the pond water, remove the sundries in the bottom mud, and keep the bottom mud flat.

[0036] The second step is to evenly spread nano-iron oxide on the surface of the bottom mud, and the content of nano-iron oxide is 40g / m 2 , Stir the bottom mud to mix the nano-iron oxide and the bottom mud evenly.

[0037] The third step is to turn the bottom mud every other week, and keep the water content of the bottom mud between 50% and 95%, and the passivation time is 21 days.

[0038] The results after the sediment restoration are shown in Table 1:

[0039] Table 1 Bioavailable heavy metal content in sediment

[0040]

[0041] Before restoration, the contents of bioavailable Cu, As, and Cd were 1.81, 1.79, and 0.15 mg / kg, respectively. After passivation restoration, the contents of bioavailable Cu, As, and Cd were reduced to 0.054, 0...

Embodiment 2

[0043] Use passivation agent to restore heavy metals Cd, Cu, As in sediment, the specific method is as follows:

[0044] The first step is to drain the pond water, remove the sundries in the bottom mud, and keep the bottom mud flat.

[0045] The second step is to evenly spread nano-iron oxide on the surface of the bottom mud, and the content of nano-iron oxide is 200g / m 2 , Stir the bottom mud to mix the nano-iron oxide and the bottom mud evenly.

[0046] The third step is to turn the bottom mud every other week, and keep the water content of the bottom mud between 50% and 95%, and the passivation time is 21 days.

[0047] The results after sediment repair are shown in Table 2:

[0048] Table 2 Bioavailable heavy metal content in sediment

[0049]

[0050]

[0051] Before restoration, the contents of biologically available Cu, As, and Cd were 1.81, 1.79, and 0.15 mg / kg, respectively; Respectively reduced 97.73%, 46.37%, 98.87%.

Embodiment 3

[0053] Use passivation agent to restore heavy metals Cd, Cu, As in sediment, the specific method is as follows:

[0054] The first step is to drain the pond water, remove the sundries in the bottom mud, and keep the bottom mud flat.

[0055] The second step is to evenly spread nano-iron oxide on the surface of the bottom mud, and the content of nano-iron oxide is 1000g / m 2 , Stir the bottom mud to mix the nano-iron oxide and the bottom mud evenly.

[0056] The third step is to turn the bottom mud every other week, and keep the water content of the bottom mud between 50% and 95%, and the passivation time is 21 days.

[0057] The results after the sediment repair are shown in Table 3:

[0058] Table 3 Bioavailable heavy metal content in sediment

[0059]

[0060] Before restoration, the contents of bioavailable Cu, As, and Cd were 1.81, 1.79, and 0.15 mg / kg, respectively. After passivation restoration, the contents of bioavailable Cu, As, and Cd were reduced to 0.013, 1.00...

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Abstract

The invention discloses a method for repairing heavy metal pollution in culture pond bottom mud. According to the method, nano ferric dioxide is adopted as a passivator for passivating and immobilizing biological effective state heavy metals, and heavy metals in pond sides and water area bottom mud are enriched by using artemisia selengensis and myriophyllum verticillatum. Therefore, potential risks of heavy metals in bottom mud can be reduced, diffusion of heavy metals in the bottom mud into water bodies and aquatic organisms can be reduced, and in addition, the risk that the heavy metals aretaken into human bodies from food chains can be reduced. The method has the advantages of being remarkable in effect, simple and convenient in operation, economic and environmentally friendly, and the like, in heavy metal repairing.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal pollution, and in particular relates to a method for remediating heavy metal pollution in bottom mud of breeding ponds. Background technique [0002] The problem of heavy metal pollution in sediment has been widely concerned. Sediment is an important part of the water environment, and it is also the living environment for most benthic organisms. Sediment is a reservoir of pollutants such as heavy metals in the water environment, which can record the change history of heavy metals in a specific area on a long-term scale. Pollutants such as heavy metals mainly enter the water body environment through atmospheric deposition and pollutant discharge. Pollutants in the water body can also enter the sediment through sedimentation. potential source of heavy metal pollution to aquatic organisms. Therefore, its heavy metal content is also an important indicator of water environment quality. Onc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00
CPCB09C1/08B09C1/105B09C2101/00
Inventor 缪爱军李嘉明邹勇郑浩杨柳燕
Owner NANJING UNIV
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