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Method for processing low concentration arsenide in water

A low-concentration, arsenide technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult removal and short reaction time, and achieve short reaction time, Good effect, good removal effect

Inactive Publication Date: 2015-12-09
CHANGCHUN GOLD RES INST
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Problems solved by technology

This method lies in the hydroxyl free radical oxidation sedimentation system provided, which solves As 3+ For problems that are difficult to remove, the flocculation and sedimentation effect is good, the reaction time is short, no aeration device is required, the cost is reduced, and the environment-friendly oxidant is used. The concentration of arsenic in the treated water can reach the "Ground Water Quality Standard" (GB / T14848-93) Class III water quality requirements in

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  • Method for processing low concentration arsenide in water
  • Method for processing low concentration arsenide in water

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specific Embodiment 1

[0021] Prepare low-concentration arsenic-containing wastewater, and the water quality is shown in Table 1:

[0022] Table 1 Raw water quality test table

[0023] Pollutant name

pH value

As

COD

Concentration (mg / L)

6.24

1.65

123.5

[0024] Note: pH is dimensionless.

[0025] Flocculation co-precipitation method, preferably, take 1L water sample and place it in a stirring tank, aerate and stir, the speed of the mixer is 500r / min, add 20% lime milk 1.0ml / L waste water, the iron ion concentration is 45mg / L, and the reaction time is 10min. 30min, solid-liquid separation, water quality results are shown in Table 2.

[0026] Table 2 Water quality test table after different reaction time treatment by flocculation co-precipitation method

[0027]

[0028]

[0029] Note: pH is dimensionless.

[0030] Preferably, take 1L of water sample and put it in the stirring tank, the speed of the stirrer is 500r / min, add 1.0ml / L of 20% lime m...

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Abstract

The invention discloses a method for processing low concentration arsenide in water. The water is suitable for processing low concentration arsenide in water, or carrying out deep treatment on high concentration arsenic-containing wastewater. The method organically combines a traditional flocculation coprecipitation technology with a hydroxyl free radical oxidation system, iron ions and hydrogen peroxide form hydroxyl free radicals with extremely strong oxidizability, a Fe-(.OH) reaction system composed of the iron ions and hydroxyl groups can efficiently complete conversion of trivalent arsenic, an iron ion complex generated in the .OH generation process continuously participates in a reaction to generate FeAsO4 with very small solubility, and the arsenide is removed in a precipitate form. The method enhances the adsorption and coacervation effects of fine particles difficult to settle, and the processed arsenide concentration can meet III type water quality requirements in Underground Water Quality Standard (GB / T14848-93).

Description

technical field [0001] The invention belongs to the technical field of environmental protection and comprehensive treatment, relates to waste water treatment and groundwater restoration, mainly aims at water containing low-concentration arsenic compounds, and relates to a method for treating low-concentration arsenic compounds in water. Background technique [0002] As a common pollutant, arsenic mainly comes from the processing and production of arsenic and arsenic compounds, as well as the mining and smelting of arsenic-containing minerals. Arsenic is a highly toxic substance, and its main form is As 3+ and As 5+ Two kinds, where As 3+ The toxicity of arsenic is even greater, and the "Integrated Wastewater Discharge Standard" will stipulate that arsenic is a type I pollutant. In some areas, arsenic pollution accidents occur from time to time, so the treatment of arsenic-containing sewage has received widespread attention. [0003] Chemical precipitation is a commonly us...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 杨飞莹张灵芝杨凤萍
Owner CHANGCHUN GOLD RES INST
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