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Method for oxidizing and absorbing As(III) in water by water hyacinth root

A technology of water hyacinth and root, which is applied in the direction of adsorbed water/sewage treatment, etc., can solve the problems of deterioration of ecological environment and unfavorable industrialization operation.

Inactive Publication Date: 2008-01-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] At present, the research on water hyacinth enrichment pollutants is mainly aimed at the living plants of the plant, but the use of living water hyacinth to treat sewage is affected by the plant's growing season, region and water body (the quality of sewage water may affect the growth of water hyacinth), and It may lead to the deterioration of the local ecological environment, which is not conducive to industrial operation

Method used

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  • Method for oxidizing and absorbing As(III) in water by water hyacinth root

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Ordinary tap water is mixed with sodium arsenite to make the concentration of As(III) reach 150μg / L, hereinafter referred to as polluted water.

[0036]Treatment method: collect water hyacinth, wash and dry, intercept its root hair, and crush it to a powder with a length of no more than 0.5 cm; combine the contaminated water 1 and water water hyacinth root powder 2 into the In the premix tank 3, the usage amount of water hyacinth hyacinth root powder and the mass ratio of As(III) polluted water body is 1: 100. In the premix tank, a mechanical stirring device 4 is used to intermittently stir mechanically for about 8 hours. 5-10 minutes for 36 hours. Then the pre-mixed water and root hair mixture 5 are passed through the 200 mesh 7 through the pipeline 6 with a valve, and the filtered water 8 enters the collecting tank 9 . The above treatments were all carried out at ambient temperature.

[0037] Ordinary tap water contains As(III) up to 150μg / L. Add root hairs accordin...

Embodiment 2

[0039] Common tap water was mixed with sodium arsenite to make the concentration of As(III) up to 60 μg / L, in order to investigate the treatment effect of reducing the amount of root hairs of the plant under the condition of lower arsenic concentration.

[0040] Processing method is with embodiment 1.

[0041] Ordinary tap water contains As(III) up to 60μg / L. Add water hyacinth root root powder according to 1 / 250 of the water mass, stir intermittently for 5-10 minutes every 8 hours, and continue to balance for 36 hours. After filtering through sand tanks and purifying The concentration of As(III) in the water was 12.8μg / L, the removal rate was 79%, and As(III) was converted into As(V).

Embodiment 3

[0043] Ordinary tap water was mixed with sodium arsenite to make the concentration of As(III) up to 30 μg / L, in order to investigate the treatment effect of reducing the amount of root hairs of the plant under the condition of lower arsenic concentration.

[0044] Processing method is with embodiment 1.

[0045] Ordinary tap water contains As(III) up to 30μg / L. Add water hyacinth root root powder according to 1 / 250 of the water quality, stir intermittently for 5-10 minutes every 8 hours, and continue to balance for 36 hours. After filtering through sand tanks and purifying The concentration of As(III) in the water was 7.2μg / L, the removal rate was 76%, and As(III) was converted into As(V).

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Abstract

This invention relates to the treatment of arsenic-containing wastewater. In this invention, the procedures are: collecting water hyacinth, and then washing, drying and cutting the roots, crushing roots into powder. Said powder and arsenic-containing water are fed into a vessel, agitating them intermittently. Finally, the powder and water are separated, to fulfil the treatment. The advantages of this invention are: simple operation, low cost, short treatment period, wide field of application, safety and suitable for commercialized treatment of wastewater.

Description

technical field [0001] The invention belongs to the field of pollution prevention and control, and relates to a method for oxidizing and adsorbing As(III) in water body by using water hyacinth root hair. Background technique [0002] Arsenic is located in the fifth main group of the periodic table and ranks twentieth in abundance in the earth's crust. It is one of the constituent elements of about 245 minerals. In nature, arsenic can exist in many different forms of compounds. The main arsenic compounds found in water bodies are arsenous acid, As(III), arsenic acid, As(V) and their salts, and inorganic arsenic The compounds can be converted into organic arsenic compounds such as monomethyl arsenic acid (MMA) and dimethyl arsenic acid (DMA) through the action of microorganisms. There are two reasons for the high concentration of arsenic in water bodies: first, natural factors, such as volcanic eruptions, and the low-temperature volatilization of certain arsenic-containing mi...

Claims

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Application Information

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IPC IPC(8): C02F1/28
Inventor 郑建中陈建王静谢显传殷俊崔皓葛磊陈欢唐荣
Owner NANJING UNIV
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