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A method for treating hexavalent chromium pollution in water

A hexavalent chromium, water treatment technology, applied in water pollutants, multi-stage water treatment, water/sewage treatment, etc. The effect of transfer efficiency

Active Publication Date: 2020-07-28
XIAN AERONAUTICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for treating hexavalent chromium pollution in water, which solves the problem that the biological method commonly used in the prior art to treat hexavalent chromium polluted wastewater has an unsatisfactory treatment effect

Method used

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  • A method for treating hexavalent chromium pollution in water
  • A method for treating hexavalent chromium pollution in water

Examples

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Effect test

Embodiment 1

[0028] A method for treating hexavalent chromium pollution in water, comprising the following steps:

[0029] Step 1, the wastewater containing hexavalent chromium is discharged into the regulating pool, and the pool water is stirred to make the water quality uniform, and the wastewater containing hexavalent chromium to be treated is obtained;

[0030] Step 2, the wastewater containing hexavalent chromium to be treated is discharged into the acidification pond, and dilute hydrochloric acid is added in the acidification pond, and the pH value of the adjustment system is 2.5;

[0031] Step 3, adding a reducing agent to the acidification pool for oxidation-reduction reaction, and the mass ratio of the reducing agent to hexavalent chromium ions is 6:1, and the oxidation-reduction reaction time is 1.5h;

[0032] Wherein, the reducing agent is formed by mixing ferrous sulfate, polyphosphorus ferric chloride and urea according to the mass ratio of 3:0.5:1;

[0033] Step 4, discharge...

Embodiment 2

[0038] A method for treating hexavalent chromium pollution in water, comprising the following steps:

[0039] Step 1, the wastewater containing hexavalent chromium is discharged into the regulating pool, and the pool water is stirred to make the water quality uniform, and the wastewater containing hexavalent chromium to be treated is obtained;

[0040] Step 2, the wastewater containing hexavalent chromium to be treated is discharged into the acidification pond, and dilute sulfuric acid is added in the acidification pond to adjust the pH value of the system to 3.0;

[0041] Step 3, adding a reducing agent to the acidification pool for oxidation-reduction reaction, and the mass ratio of the reducing agent to hexavalent chromium ions is 8:1, and the oxidation-reduction reaction time is 1h;

[0042] Wherein, the reducing agent is mixed by ferrous sulfate, polyphosphorus ferric chloride and urea according to the mass ratio of 3:0.5:1;

[0043] Step 4, discharge the waste water aft...

Embodiment 3

[0048]A method for treating hexavalent chromium pollution in water, comprising the following steps:

[0049] Step 1, the wastewater containing hexavalent chromium is discharged into the regulating tank, and the pool water is stirred to make its water quality uniform, and the wastewater containing hexavalent chromium is obtained to be treated;

[0050] Step 2, the wastewater containing hexavalent chromium to be treated is discharged into the acidification pond, and dilute sulfuric acid is added in the acidification pond to adjust the pH value of the system to be 2.8;

[0051] Step 3, adding a reducing agent to the acidification tank for oxidation-reduction reaction, and the mass ratio of the reducing agent to hexavalent chromium ions is 5:1, and the oxidation-reduction reaction time is 2h;

[0052] Wherein, the reducing agent is mixed by ferrous sulfate, polyphosphorus ferric chloride and urea according to the mass ratio of 3:0.5:1;

[0053] Step 4, discharge the waste water a...

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Abstract

The invention discloses a method for treating hexavalent chromium pollution in water. The method includes following steps: homogenizing and acidifying wastewater containing hexavalent chromium, and adding a reducing agent composed of ferrous sulfate, polyphosphorus ferric chloride and urea for redox reaction; adding alkali to redox reaction liquid for flocculation precipitation reaction, and allowing supernate after flocculation precipitation to enter a biological reaction tank for biological reaction under action of medical stone powder, lignin powder and activated sludge in the biological reaction tank to obtain wastewater after being treated. By the method, various physiochemical indexes of the wastewater after being treated can reach discharging standards, COD, BOD, SS and hexavalent chromium ion content is lowered effectively. The method is simple in treatment process, low in agent consumption, good in treatment effect, stable in performance and good in outgoing water quality andhas great application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for treating hexavalent chromium pollution in water. Background technique [0002] Chromium usually exists in the environment in the form of trivalent or hexavalent compounds. The valence state of chromium-containing compounds determines its toxicity. It is generally believed that the toxicity of hexavalent chromium is 500 times that of trivalent chromium. Wastewater containing hexavalent chromium is generally treated by biological methods. Although biological methods have the advantages of mild reaction, low energy consumption, and small impact on the environment, chromium-containing wastewater generally comes from chemical companies. The pollutants in this type of wastewater are complex. The biological treatment method is generally aimed at the removal of hexavalent chromium ions and cultivates special biological bacteria. Although this type of bacterial strai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/22
CPCC02F1/5236C02F1/66C02F1/70C02F1/72C02F1/725C02F3/02C02F3/34C02F9/00C02F2101/22C02F2301/08C02F2305/06
Inventor 李雅方向青
Owner XIAN AERONAUTICAL UNIV
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