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A method for purifying arsenic-containing micro-polluted water source in vertical flow artificial wetland

A constructed wetland and vertical flow technology, applied in chemical instruments and methods, water pollutants, biological water/sewage treatment, etc., can solve problems such as poor absorption and enrichment effects, reduce arsenic content and achieve good treatment effects , improve the effect of enrichment effect

Active Publication Date: 2020-09-22
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of the poor improvement effect of using plants to absorb, enrich and transform arsenic in water bodies in the prior art, and to provide a method for purifying arsenic-containing slightly polluted water sources in vertical flow constructed wetlands

Method used

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  • A method for purifying arsenic-containing micro-polluted water source in vertical flow artificial wetland
  • A method for purifying arsenic-containing micro-polluted water source in vertical flow artificial wetland
  • A method for purifying arsenic-containing micro-polluted water source in vertical flow artificial wetland

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Embodiment 1

[0039] This embodiment provides a method for purifying arsenic-containing micro-polluted water sources in vertical flow constructed wetlands, mainly using two-section filter tanks, such as figure 1 , including the following steps:

[0040] S101: Open a water passage in the wetland matrix to form a water absorption part, and place a filter layer at the bottom of the water passage;

[0041] Specifically, a soil column sampler with an outer diameter of 8 cm was used to drill a water channel on the wetland substrate. The water channel was a tubular channel with a diameter of about 8 cm and a depth of 20 cm, and the filter layer was gravel with a thickness of 5 cm.

[0042] S102: Place a first filter tank with holes in the bottom and side walls on the filter layer, and place a first filler in the first filter tank; the sum of the heights of the first filter tank and the filter layer is lower than the height of the water passage;

[0043] Specifically, the first filter is a ceramic...

Embodiment 2

[0062] This embodiment provides a method for purifying arsenic-containing micro-polluted water sources in vertical flow constructed wetlands, mainly using two-section filter tanks, such as Figure 5 , including the following steps:

[0063] S201: Open a water passage in the wetland substrate to form a water absorption part, and place a filter layer at the bottom of the water passage;

[0064] Specifically, a soil column sampler with an outer diameter of 8 cm was used to drill a water channel on the wetland substrate. The water channel was a tubular channel with a diameter of about 8 cm and a depth of 20 cm, and the filter layer was gravel with a thickness of 5 cm.

[0065] S202: Place a first filter tank with openings in the bottom and side walls on the filter layer, and place a first filler in the first filter tank; the sum of the heights of the first filter tank and the filter layer is lower than the height of the water passage;

[0066] Specifically, the first filter is a ...

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Abstract

The invention relates to a method of purifying an arsenic-containing micro-polluted water source of a vertical flow artificial wetland. The method comprises the following steps of: S1: forming a waterpassing channel in a wetland matrix to form a water absorption part and placing a filter layer at the bottom of the water passing channel and placing first filling at least comprising ferrihydrite inthe first filter tank, S2: placing a first filter tank on the filter layer, S3: superposing a second filter tank on the first filter tank and placing second filling in the second filter tank, and S4:transplanting ciliate desert-grass on the second filling and absorbing, enriching and converting arsenic in the water source through the ferrihydrite and the ciliate desert-grass, wherein the heightsum of the first filter tank and the filter layer is less than the height of the water passing channel; the upper part of the second filling protrudes from the water passing channel; and the second filling is a mixture of solid particles and the ferrihydrite that are used for fixing and culturing the ciliate desert-grass. The method can make full use of an enrichment of the ferrihydrite and the ciliate desert-grass to greatly reduce an arsenic content.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for purifying arsenic-containing slightly polluted water sources in vertical flow constructed wetlands. Background technique [0002] Arsenic is a chemical element that widely exists in nature, and its common forms are arsenate As(Ⅴ) and arsenite As(Ⅲ). Arsenic and its soluble compounds are highly toxic and can enter the human body through the respiratory tract, food, drinking water or skin contact, causing great harm to humans, animals and plants. [0003] With the continuous development of society and the continuous improvement of living standards, people have higher and higher hygiene requirements for drinking water. At present, my country's drinking water hygiene standard (GB5749-2006) has changed the arsenic content from 0.05 mg / L to 0.01 mg / L. Although the standards have been raised, my country is still one of the countries with the most serio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/32C02F101/10
CPCC02F3/32C02F2101/103
Inventor 李翠丹李俏雅李萍温国强
Owner DONGGUAN UNIV OF TECH
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