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Method for removing heavy metals from water body by composite wetland vegetation

A wetland vegetation and heavy metal technology, applied in the field of wastewater ecological treatment and mineral resource development, can solve the problems of affecting stability and long stability period of the artificial wetland vegetation system, and achieve a good tolerance, good adaptability and strong pertinence. Effect

Inactive Publication Date: 2012-07-18
靖德兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the vegetation system of constructed wetlands has a long stable cycle, and individual wetland plants may compete for ecological factors (such as light, heat, water, air, and fertilizer) and release allelochemicals through root exudates and litter. Affects the stability of the entire vegetation community and often requires years of operation to reach maturity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the optimized formula, build a hydroponic wetland system, and the composite wetland vegetation is as follows: 100 reeds / m 2 , 20 cattails / m 2 , 80 willows / m 2 , mixed evenly. The hydroponic wetland adopts pure hydroponics, and the water intake design is shown in Table 1 below.

[0020] Table 1 Water intake design of composite wetland vegetation (refer to the third-level standard of GB 8978-1996 comprehensive sewage discharge standard)

[0021] the element

[0022]Change the water once a week, and collect samples for inspection. After one year of operation, the results are as follows. After optimized composite vegetation wetland treatment, the content of heavy metals in the effluent was significantly reduced, and the concentrations of Cu, Zn, Ni, Mn, and Cd were all controlled by the third-level standard of the "Integrated Wastewater Discharge Standard (GB 8978-1996)" (planned to be discharged into the second-level sewage treatment plant Sewage...

Embodiment 2

[0024] According to the optimized formula, build a hydroponic wetland system, and the composite wetland vegetation is as follows: 26 reeds / m 2 , 80 cattails / m 2 , 94 willows / m 2 , mixed evenly. The hydroponic wetland adopts pure hydroponics, and the influent concentration is designed as: A1 3+ 3mgL -1 、Ag 2+ 0.5mgL -1 . Change the water once a week, and collect samples for inspection. After one year of operation, the results are as follows.

[0025] After optimized composite vegetation wetland treatment, the removal rate of aluminum and silver reached about 80% or more, and the content of heavy metals in the effluent was significantly reduced (Ag 2+ Concentration decreased to about 0.1mg L -1 ); the total metal content in the aboveground biomass of the harvested vegetation was close to 0.1%.

[0026] Air-dried, incinerated, dissolved in water, and filtered the adsorbed aboveground biomass, and obtained most of the heavy metals adsorbed on it and enriched in it through...

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Abstract

The invention relates to a method for removing heavy metals from a water body by composite wetland vegetation. The method is characterized in that a wetland system is built on the water body; and the composite wetland plants in the wetland system are reed, cattail and willow, the hydraulic retention time is 5-10 days, 10-100 plants of reeds are planted on each square meter, 10-150 plants of cattail are planted on each square meter, and 20-100 plants of willow are planted on each square meter. According to the plant density of three types of wetland plants, the removal capacities of the three types of plants are complementarily collocated and are mutually accelerated; meanwhile, because of the mutual action of the three types of wetland plants, the composite wetland vegetation has strong vitality, good tolerance and high competitiveness, the formed composite vegetation can be stable for a long term, and therefore, the higher removal efficiency can be kept for a long term within the loading capability range of the heavy metals; and the composite wetland vegetation with the optimized formula is applied to obviously lower the heavy metal content of effluent, the heavy metal content in the biomass of the composite wetland vegetation can be expected to reach 0.5-1% or above, and the composite wetland vegetation has the value of a mineral resource.

Description

technical field [0001] The invention relates to the fields of waste water ecological treatment and mineral resources development, in particular to a method for removing and recycling heavy metals from water bodies by applying optimized composite wetland vegetation. Background technique [0002] As early as the beginning of the 20th century, Britain and the United States had precedents for using cattail swamps to treat sewage. In the 1970s, the artificial wetland sewage treatment system was popular all over the world because of its simple engineering, convenient management, low operating costs, and good treatment effects. It is widely used in domestic sewage and even industrial wastewater treatment. Water purification in a wetland system is the result of a combination of physical, chemical, and biological mechanisms, depending on vegetation, substrate, water depth, and microbial communities. Vascular plants in general wetlands can fix the substrate and precipitate suspended ...

Claims

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Application Information

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IPC IPC(8): C02F3/32C25C1/00
CPCY02P10/20Y02W10/10
Inventor 靖德兵
Owner 靖德兵
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