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Method of mixing natural pyrrhotite and zero-valent iron to treat wastewater containing heavy metal ions

A technology of heavy metal ions and pyrrhotite, applied in water/sewage treatment, chemical instruments and methods, reduced water/sewage treatment, etc., to achieve mild reaction conditions, low energy consumption, and reduced production

Active Publication Date: 2020-04-14
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no literature reports or patent publications on mixing natural pyrrhotite with zero-valent iron to remediate heavy metal ion pollution in wastewater.

Method used

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  • Method of mixing natural pyrrhotite and zero-valent iron to treat wastewater containing heavy metal ions
  • Method of mixing natural pyrrhotite and zero-valent iron to treat wastewater containing heavy metal ions
  • Method of mixing natural pyrrhotite and zero-valent iron to treat wastewater containing heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, in Example 1, zero-valent iron and pyrrhotite are mixed to treat Cr(VI)-containing wastewater (concentration is 50ppm, pH 3.0), according to the following steps:

[0027] (1) Zero-valent iron screens iron powder with a particle size of 50-100 mesh, and leaks out the fresh surface of zero-valent iron through washing and pickling for use. The natural pyrrhotite is pulverized by a ball mill, and the particle size is screened to be 50-100 mesh, and the fresh surface of the pyrrhotite is leaked out by water washing or acid washing for use.

[0028] (2) Weigh 0.3g of zero-valent iron, 0.3g of pyrrhotite, 0.3g of zero-valent iron and 0.3g of pyrrhotite after treatment in step (1), and add them to 100mL of Cr-containing ( Ⅵ) In the wastewater, the concentrations of zero-valent iron and pyrrhotite are both 3g / L, and the ratio is 1:1.

[0029] (3) React for 14 hours in a shaker with a rotating speed of 100r / min and 25°C. Samples were taken after the ...

Embodiment 2

[0032] Such as figure 2 As shown, the mixed treatment of zero-valent iron and pyrrhotite in Example 2 containing Se(VI) wastewater (concentration is 10ppm, pH 5.0) is carried out according to the following steps:

[0033] (1) The treatment steps are different from Example 1 in that the screening particle size of zero-valent iron and pyrrhotite is 100-200 mesh, the added concentration is 15g / L and 5g / L respectively, and the ratio is 3:1. React for 24 hours in a shaker with a rotating speed of 160r / min and 30°C. After the reaction, the concentration of residual Se(VI) in the sample was determined by graphite furnace atomic absorption spectrophotometry.

[0034] (2) The results show that the removal rate of Se(VI) treated by zero-valent iron alone is 36.7%, the removal rate of Se(VI) by pyrrhotite alone is 7.9%, and the mixed treatment of zero-valent iron and pyrrhotite The removal rate of (VI) was 69.2%, which was greater than the sum of 44.6% of the removal rates of Se(VI) t...

Embodiment 3

[0036] Such as image 3 As shown, in Example 3, zero-valent iron and pyrrhotite are mixed to treat Se(IV)-containing wastewater (concentration is 60ppm, pH 7.0), according to the following steps:

[0037] (1) The treatment steps are different from Example 1 in that the screening particle size of zero-valent iron and pyrrhotite is 150-200 mesh, the added concentration is 4g / L and 16g / L respectively, and the ratio is 1:4. React for 20 hours in a shaker with a rotating speed of 180r / min and 35°C. After the reaction, the concentration of residual Se(IV) in the sample was measured by graphite furnace atomic absorption spectrophotometry (measurement wavelength: 196nm).

[0038] (2) The results show that the removal rate of Se(IV) treated by zero-valent iron alone is 11.7%, the removal rate of Se(IV) by pyrrhotite alone is 34.6%, and the mixed treatment of zero-valent iron and pyrrhotite The removal rate of (IV) was 73.9%, which was greater than the sum of 46.3% of the removal rate...

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Abstract

The invention relates to a method for treating heavy metal ion containing wastewater through mixed natural pyrrhotite and zero-valent iron. The method includes the following steps that 1, the zero-valent iron is smashed into iron powder with the grain diameter ranging from 50 mesh to 300 mesh, and the zero-valent iron fresh surface is exposed through water washing and acid washing for use; 2, the natural pyrrhotite is smashed to be at the grain diameter ranging from 50 mesh to 300 mesh through a ball mill, and a pyrrhotite fresh surface is exposed through water washing for use; 3, the pH value of the heavy metal ion containing wastewater is adjusted to range from 2 to 10; 4, the treated zero-valent iron and pyrrhotite are mixed with the heavy metal ion containing wastewater in the same oscillator, the mass concentration of the mixed zero-valent iron and pyrrhotite is not smaller than 5 g / L, and the mixing ratio ranges from 10:1 to 1:10. The reduction removal efficiency of heavy metal ions in the wastewater can be remarkably improved, the reduction stability of the zero-valent iron can be further enhanced, and the method for treating the heavy metal ion containing wastewater is simple, effective and low in cost.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method of using natural pyrrhotite and zero-valent iron to mix wastewater containing heavy metal ions (including Cr(VI), Se(VI), Se(IV) and U(VI) etc.) method. Background technique [0002] With the development of industry and agriculture in my country and the acceleration of urbanization, a large amount of untreated industrial and agricultural wastewater, urban garbage, and atmospheric sediment are continuously discharged into water bodies, causing serious water pollution, among which heavy metal water pollution is the most serious. serious. Therefore, the effective removal of heavy metal pollutants that are highly toxic and difficult to metabolize in groundwater is one of the environmental problems that need to be solved urgently. The remediation technology of heavy metal pollution in water body can be divided into: physical method, biological method, chemical metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/62
CPCC02F1/705C02F2101/20C02F2101/22
Inventor 李益民栗占锋董华平
Owner SHAOXING UNIVERSITY