Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for removing high-valence chromium from wastewater

A technology for high-priced chromium and wastewater, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of consuming large reducing agents, acid-base solutions, etc.

Inactive Publication Date: 2019-01-04
YANGTZE NORMAL UNIVERSITY
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical reduction precipitation method is the most traditional method. This method has the advantages of mature technology, simple operation, low equipment investment and low operating cost. However, this method consumes a large amount of reducing agent, acid-base solution, and produces a large amount Chromium sludge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for removing high-priced chromium in waste water, comprising the steps of:

[0016] S1, adding a small amount of sulfuric acid to the wastewater to adjust the pH of the wastewater to 0-4.0;

[0017] S2. Insert the cleaned stainless steel electrode into the waste water tank, turn on the power, adjust the voltage, and the current density at the electrode is 0.01A / cm 2 , after 60 minutes of electrolysis at a temperature of 70°C, stop the electrolysis;

[0018] S3, add appropriate amount of sodium hydroxide in the waste water after finishing electrolysis, stirring reaction 30-90min, pressure filtration obtains chromium-free waste water and chromium hydroxide slag; The amount ratio of chromium ion substance in sodium hydroxide and waste water is 3: 1;

[0019] S4. Discharge the chromium-free wastewater after treatment, and reuse the chromium hydroxide slag as a chromium resource after simple treatment.

Embodiment 2

[0021] A method for removing high-priced chromium in waste water, comprising the steps of:

[0022] S1, adding a small amount of sulfuric acid to the wastewater to adjust the pH of the wastewater to 0-4.0;

[0023] S2. Insert the cleaned quaternary alloy electrode into the waste water tank, turn on the power, adjust the voltage, and the current density at the electrode is 0.05A / cm 2 , after 10 minutes of electrolysis at a temperature of 30°C, stop the electrolysis;

[0024] S3, add appropriate amount of sodium hydroxide in the waste water after finishing electrolysis, stirring reaction 30-90min, pressure filtration obtains chromium-free waste water and chromium hydroxide slag; The amount ratio of chromium ion substance in sodium hydroxide and waste water is 3: 1;

[0025] S4. Discharge the chromium-free wastewater after treatment, and reuse the chromium hydroxide slag as a chromium resource after simple treatment.

Embodiment 3

[0027] A method for removing high-priced chromium in waste water, comprising the steps of:

[0028] S1, adding a small amount of sulfuric acid to the wastewater to adjust the pH of the wastewater to 0-4.0;

[0029] S2. Insert the cleaned quaternary alloy electrode into the waste water tank, turn on the power, adjust the voltage, and the current density at the electrode is 0.03A / cm 2 , after 35 minutes of electrolysis at a temperature of 50°C, stop the electrolysis;

[0030] S3, add appropriate amount of sodium hydroxide in the waste water after finishing electrolysis, stirring reaction 30-90min, pressure filtration obtains chromium-free waste water and chromium hydroxide slag; The amount ratio of chromium ion substance in sodium hydroxide and waste water is 3: 1;

[0031] S4. Discharge the chromium-free wastewater after treatment, and reuse the chromium hydroxide slag as a chromium resource after simple treatment.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for removing high-valence chromium from wastewater. The method comprises the following steps: S1, a small amount of sulfuric acid is added to the wastewater to regulate pH of the wastewater to 0-4.0; S2, a cleaned electrode is inserted into a wastewater tank, a power supply is on, voltage is regulated, and electrolysis is performed under the current density of theelectrode being 0.01 A / cm<2>-0.05 A / cm<2> at 30-70 DEG C and stopped; S3, a proper amount of sodium hydroxide is added to the electrolyzed wastewater, the mixture is subjected to stirring reaction for30-90 min, and chromium-free wastewater and chromium hydroxide residues are obtained by filter pressing; S4, the chromium-free wastewater is treated and discharged, and the chromium hydroxide residues are simply treated and recycled as a chromium resource. Electric energy as clean energy is adopted to replace the traditional chemical reducing agent, discharge of chromium-containing sludge is reduced while hexavalent chromium is reduced efficiently, and recycling of chromium can be realized.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for removing high-valent chromium in wastewater. Background technique [0002] Chromium is one of the essential trace elements for animals and human body, but a large amount of chromium entering the environment will cause great harm to human body, plants and animals. With the rapid development of industry, chromium pollution is becoming more and more serious, mainly involving metallurgy, chemical industry, agriculture, medicine and other fields. For a long time, the treatment of chromium-containing wastewater has been a difficult environmental problem and an important research field in industrial wastewater treatment. In chromium-containing waste liquid, chromium mainly exists in the form of Cr(III) and Cr(VI), among which Cr(III) is more stable than Cr(VI), and its toxicity is relatively low. At present, the main treatment method is to reduce Cr(VI) to Cr(III) befo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C02F9/06C02F101/22
CPCC02F1/001C02F1/4676C02F1/62C02F1/66C02F9/00C02F2001/46133C02F2101/22C02F2201/4614C02F2201/4615C02F2209/06C02F2209/44
Inventor 彭浩郭静成钦哲周玉桔杨柳赵恒新冷雨萌李贤宾
Owner YANGTZE NORMAL UNIVERSITY