Method for removing organic arsenic in water through synchronous oxidation and in-situ adsorption

A technology for organic arsenic and water removal, applied in chemical instruments and methods, adsorption water/sewage treatment, oxidized water/sewage treatment, etc. Large specific surface area, efficient adsorption and removal effect

Pending Publication Date: 2020-06-26
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The object of the present invention aims at the organic arsenic pollutants in water, especially the problem that the organic arsenic in the source water of a large-scale drinking water arsenic removal water plant cannot realize synchronous oxidation and in-situ ads

Method used

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  • Method for removing organic arsenic in water through synchronous oxidation and in-situ adsorption
  • Method for removing organic arsenic in water through synchronous oxidation and in-situ adsorption
  • Method for removing organic arsenic in water through synchronous oxidation and in-situ adsorption

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specific Embodiment approach 1

[0043] Specific embodiment one: a kind of synchronous oxidation and in-situ adsorption method of removing organic arsenic in the present embodiment, it is carried out according to the following steps:

[0044] Add ferrous salt and persulfate to arsenic-containing water to realize simultaneous oxidation degradation and in-situ adsorption to remove organic arsenic in water, wherein the molar ratio of ferrous salt and persulfate is: 1:0.8-4.

[0045] In this embodiment, the total arsenic concentration can be detected by an inductively coupled plasma atomic emission spectrometer (ICP-OES) or an inductively coupled plasma mass spectrometer (ICP-MS), and the separation and determination of organic arsenic and inorganic arsenic can be performed by high performance liquid chromatography. Combined with inductively coupled plasma mass spectrometry (LC-ICP-MS) detection.

[0046] This embodiment adopts divalent iron salt (Fe 2+ ) activating the persulfate to treat the organic arsenic in...

specific Embodiment approach 2

[0047] Embodiment 2: This embodiment differs from Embodiment 1 in that the arsenic-containing water is organic arsenic and / or inorganic arsenic. Others are the same as in the first embodiment.

[0048] The method in this embodiment is mainly aimed at organic arsenic, but the method is also applicable to inorganic arsenic or a mixture of the two, and can still achieve the technical effect described in the present invention.

[0049] Verify the beneficial effects of the present invention through the following examples:

Embodiment 1

[0051] A method for removing organic arsenic in water by synchronous oxidation and in-situ adsorption of the present embodiment comprises the following steps: adding 100 μmol of ferrous sulfate and 75 μmol of potassium peroxodisulfate to 1 L of water containing p-aminophenylarsine, The concentration of aminophenylarsine is 5 μmol / L, the pH is 3, and the temperature is 25°C. After stirring for 30 minutes, adjust the pH to 6, and filter through a 0.22 μm cellulose acetate membrane to complete the removal of arsenic in water. After testing, 90.3% of p-aminophenylarsine was oxidatively degraded, the removal rate of total arsenic was 99.4%, and the content of remaining total arsenic was 2.25 μg / L, which was lower than that specified in the Hygienic Standard for Drinking Water (GB5749-2006). The specified limit of arsenic concentration in water (10μg / L).

[0052] Compared with CN 109942070A patent, the condition of pH=3 in this embodiment, and the minimum pH of CN 109942070A patent ...

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Abstract

The invention relates to a treatment method of water containing organic arsenic, and discloses a method for removing organic arsenic in water through synchronous oxidation and in-situ adsorption. According to the method, organic arsenic pollutants in water are solved; particularly, a problem that organic arsenic in water source water of a large-scale drinking water arsenic removal water plant cannot be synchronously oxidized and adsorbed and removed in situ is solved. The method comprises the following steps: adding a divalent iron salt and persulfate into water containing organic arsenic to realize synchronous oxidative degradation and in-situ adsorption removal of organic arsenic in water, and the molar ratio of the divalent iron salt to the persulfate is 1:(0.8-4). The method disclosedby the invention is simple in process operation, wide in applicable water quality condition, capable of efficiently removing representative organic arsenic that is p-arsanilic acid contained in water,and particularly suitable for removing organic arsenic in water source water of large-scale drinking water arsenic removal water plants. The method is applied to the field of arsenic removal.

Description

technical field [0001] The invention relates to a treatment method for water containing organic arsenic, in particular to a method for removing organic arsenic represented by p-aminophenylarsine, especially an application method for removing trace and trace organic arsenic in drinking water. Background technique [0002] Organic arsenic such as p-aminophenylarsine acid (alsanic acid), 3-nitro-4-hydroxyphenylarsine acid (roxarsone) has been widely used as a feed additive for pigs, chickens and other livestock and poultry as synthetic antibacterial agents. They have the function of killing bacteria, protozoa and spirochetes, and can promote the growth of livestock and poultry and improve feed efficiency. However, these organic arsenic will hardly be decomposed in animals, and most of them will be excreted through feces. Most of the aquaculture wastewater is simply treated or discharged directly without treatment, resulting in the discharge of more than several thousand tons o...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/28C02F101/10C02F101/38
CPCC02F1/725C02F1/281C02F2101/38C02F2101/103
Inventor 马军王盼新江进程海军何旭纪润灵丁健
Owner HARBIN INST OF TECH
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