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Method for treating water containing organic arsenic

A treatment method and technology for organic arsenic, which are applied in the treatment of polluted groundwater/leachate, light water/sewage treatment, oxidized water/sewage treatment, etc. problem, to achieve the effect of preventing drinking water pollution

Inactive Publication Date: 2006-05-31
ASTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the technologies described in Patent Documents 1 and 2 are all methods for removing inorganic arsenic, and there is no disclosure about the removal of organic arsenic. No matter which method is used, the effective removal of organic arsenic cannot be achieved.

Method used

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  • Method for treating water containing organic arsenic
  • Method for treating water containing organic arsenic
  • Method for treating water containing organic arsenic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] (unboiled water)

[0085] Water from local wells is used as raw water. Table 1 shows the analysis results of diphenylarsinic acid, which is organic arsenic in raw water. Raw water does not contain inorganic arsenic.

[0086] Analysis value (mg / L)

Diphenylarsinic acid

0.02~0.03 (average value 0.025)

[0087] (Analysis method and lower limit of quantification of diphenylarsine)

[0088] Analytical method: analyzed by solvent extraction-GC / MS

[0089] Lower limit of quantitation: 0.001mg / L

[0090] (photooxidation treatment)

[0091] The raw water above was subjected to photooxidation treatment according to the recipes of experiments 1-1 to 10 shown in Table 2. In the photooxidation tank, air or ozone is supplied from below and aeration and stirring are performed. The supply rate of air or ozone is 2.0 L / min.

[0092] In the experiment of adding ozone, the addition amount was 0.375 mg / L, and the ozone addition amount per hour was 0.375×...

Embodiment 2

[0105] The treated water photolyzed in Example 1 was subjected to the following coagulation treatment. Treatment methods including coagulant, addition amount, coagulation time, settling time such as image 3 shown.

[0106] Next, the concentration of diphenylarsinic acid and the concentration of arsenic were measured for the treated water before the coagulation treatment after the photooxidation raw water and the treated water after the coagulation treatment. Analytical method is identical with embodiment 1. The analysis results of the treated water are shown in Table 5.

[0107] Arsenic analysis value (mg / L)

raw water

0.02~0.03 (average value 0.025)

experiment

1-1

ozone aeration

After photooxidation

Diphenylarsinic acid

Below the detection limit

Inorganic arsenic

0.030

After agglutination

Diphenylarsinic acid

Below the detection limit

Inorganic arsenic

Below the detecti...

Embodiment 3

[0112] Embodiment 1 and embodiment 2 are experiments on the treatment of raw water containing low-concentration organic arsenic (0.02-0.03mg / L), and this embodiment 3 is an experiment to study the appropriate addition amount of oxidant during medium concentration and high concentration .

[0113] In the treatment experiment, groundwater with an organic arsenic content of 0.6-0.7 mg / L was used to carry out photooxidation treatment according to the formula shown in Table 6 below. Ozone aeration and stirring are carried out in the photooxidation tank.

[0114]

[0115] Table 7 shows the results of the above processing. Table 7 shows the analysis results of the total arsenic concentration in the treated water after the photooxidation treatment.

[0116] Experiment number

[0117] From the above results, it can be seen that when the concentration of raw water increases, even if the analysis results of the treated water after photooxidation treatment are seen, ...

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Abstract

The present invention provides a method for treating water containing organic arsenic, which can remove diphenylarsinic acid, which is a representative organic arsenic contained in groundwater, and can prevent drinking water contamination. The treatment method includes a step of photooxidizing raw water containing organic arsenic having a bond formed by an organic group and an arsenic atom with light to dissociate the bond formed by the organic group and an arsenic atom. step; and a step of subjecting the arsenic or arsenic compound produced by dissociation in the photo-oxidation step to agglutination treatment, preferably, the photo-oxidation step is performed by light irradiation in the presence of ozone.

Description

technical field [0001] The present invention relates to a method for treating water containing organic arsenic, and in particular, relates to a method for treating water containing organic arsenic that can prevent contamination of drinking water by removing diphenylarsinic acid, which is a representative organic arsenic contained in groundwater. . Background technique [0002] Since January 2004, the Ministry of the Environment has analyzed the poisonous gas-related substances in the well water at the former site of the chemical experiment department of the former Sagami Naval Factory. As a result, it was reported in March that 0.001 mg / l (as converted to arsenic) of diphenylarsine was detected. Acid (DPAA), so Hiratsuka City, Kanagawa Prefecture has taken measures to suspend the drinking of well water around the former site of the chemical experiment department of the former Sagami Naval Factory and in the lower basin. [0003] In September 2004, it was also reported in Ib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/30C02F1/78
CPCC02F1/28C02F1/30C02F1/78C02F2103/06
Inventor 森本辰雄藤原务口船爱
Owner ASTEC
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