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

Method for removing hexavalent chromium from industrial wastewater

A technology for industrial wastewater and hexavalent chromium, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of low adsorption capacity, high cost of ion exchange method, and long time required. Achieve strong adsorption capacity, large adsorption capacity and high selectivity

Active Publication Date: 2013-10-23
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
View PDF8 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods still have many shortcomings in the treatment of industrial wastewater containing hexavalent chromium.
For example, the traditional adsorbents used in the adsorption method have disadvantages such as low adsorption capacity, long time to reach adsorption equilibrium or expensive chemical reagents in the preparation process; the biological method has a long treatment period and limited treatment capacity, and the trivalent chromium formed after reduction It is easy to form organic chromium with strong mobility with organic matter; the cost of ion exchange method is high
In addition, the carrier materials used in the ion exchange method and membrane method are all organic matter, and the treatment of acidic and high-concentration hexavalent chromium-containing wastewater is easily oxidized

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

[0018] (1) Fill the filter column with 300 g of magnesium-calcium-aluminum composite oxide.

[0019] (2) Use a water pump to circulate 20 L of electroplating wastewater containing 1200 mg / L hexavalent chromium in the column filled with magnesium-calcium-aluminum composite oxide for 40 minutes.

[0020] (3) The concentration of hexavalent chromium ions in water is 0.39 mg / L as detected by diphenylcarbazide spectrophotometry (GB 7467-87).

Embodiment 2

[0022] (1) Fill the filter column with 200 g of magnesium-iron-aluminum composite oxide.

[0023] (2) Use a water pump to circulate 30 L of electroplating wastewater containing 600 mg / L hexavalent chromium in the filter column filled with magnesium-iron-aluminum composite oxide for 30 minutes.

[0024] (3) The concentration of hexavalent chromium ions in water is 0.21 mg / L as detected by diphenylcarbazide spectrophotometry (GB 7467-87).

Embodiment 3

[0026] (1) Fill the filter column with 400 g of magnesium-calcium-aluminum composite oxide.

[0027] (2) Use a water pump to circulate 50 L of electroplating wastewater containing 500 mg / L hexavalent chromium in the column filled with magnesium-calcium-aluminum composite oxide for 30 minutes.

[0028] (3) The concentration of hexavalent chromium ions in water is 0.5 mg / L as detected by diphenylcarbazide spectrophotometry (GB 7467-87).

[0029] Example 3:

[0030] (1) Fill 350 g of magnesium-iron-aluminum composite oxide into the filter column.

[0031] (2) Use a pump to circulate 50 L of chlorate electrolysis wastewater containing 480 mg / L hexavalent chromium in the column filled with magnesium-iron-aluminum composite oxide for 30 min.

[0032] (3) The concentration of hexavalent chromium ions in water is 0.42 mg / L as detected by diphenylcarbazide spectrophotometry (GB 7467-87).

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 provides a method for removing hexavalent chromium from industrial wastewater. Trimetal composite oxide [xA(II)O.yB(II)O.zC(III)O3 / 2] is adopted for absorbing the hexavalent chromium in the industrial wastewater, wherein A and B are selected from any two of Zn, Mg, Ca, Cu, Co, Ni and Fe; C is selected from any one of Fe, Al and Ti; (x+y) / z is larger than 2 and less than 4. The industrial wastewater circularly passes through a filter column filled with the trimetal composite oxide until the concentration of the hexavalent chromium is lower than 0.5mg / L.

Description

technical field [0001] The invention relates to a method for removing hexavalent chromium in industrial waste water. Background technique [0002] Hexavalent chromium and its compounds are important chemical raw materials, which are widely used in many fields of the national economy such as electroplating, metallurgy, pigments, printing and dyeing, and chromium salt production. With the rapid development of my country's industry, the above-mentioned industries continue to discharge a large amount of industrial wastewater containing hexavalent chromium, causing serious environmental pollution. Hexavalent chromium is highly toxic and highly mobile, posing a serious threat to the health of humans, animals and plants, and has been identified as a human carcinogen by the International Agency for Research on Cancer (IARC). The traditional industrial hexavalent chromium-containing wastewater treatment method is mainly the chemical reduction-precipitation method, that is, the highl...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62
Inventor 林璋陈志王永净吕香英
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI