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A combined process for treating heavy metal complexing waste water

A combined process and heavy metal technology, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problems that the new process is difficult to take into account the economic and environmental friendliness, and the treatment effect is poor. , to achieve the effect of high utilization rate, high utilization rate, and reduction of TOC and COD values

Active Publication Date: 2014-10-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems in the prior art that the treatment effect of the traditional method is poor when the complexing agent exists, and the new process is difficult to balance economy and environmental friendliness, the present invention provides a combined process for treating heavy metal complex wastewater

Method used

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  • A combined process for treating heavy metal complexing waste water

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Effect test

Embodiment 1

[0031] combine figure 1 , the copper concentration in the solution to be treated is 19.6mg / L, and contains excess citric acid.

[0032] Adopt a kind of combined process of processing heavy metal complex wastewater of the present invention to carry out wastewater treatment, its steps are:

[0033] Add ferric chloride according to the iron-copper molar ratio of 5:1, after mixing for 5 minutes, use a light intensity of 6mW / cm 2 Irradiate with a medium-pressure mercury lamp for 6 minutes, add calcium hydroxide to adjust the pH of the water to 9-10, and let it settle.

[0034] The remaining copper concentration in the final water body is about 0.4mg / L, the removal rate is about 98%, and the total organic carbon removal rate in water is 30-40%.

Embodiment 2

[0036] The copper concentration in the solution to be treated is 19.2 mg / L, and contains a slight excess of tartaric acid.

[0037] Adopt a kind of combined process of processing heavy metal complex wastewater of the present invention to carry out wastewater treatment, its steps are:

[0038] Add iron sulfate according to the iron-copper molar ratio of 6:1, after mixing for 10 minutes, use a light intensity of 6mW / cm 2 Irradiate with a medium-pressure mercury lamp for 8 minutes, add calcium oxide to adjust the pH of the water to 9-10, and let it settle.

[0039] The remaining copper concentration in the final water body is about 0.4mg / L, the removal rate is about 97.9%, and the total organic carbon removal rate in water is about 50%.

Embodiment 3

[0041] The copper concentration in the solution to be treated is 19.2mg / L, and contains slightly excess nitrilotriacetic acid.

[0042] Adopt a kind of combined process of processing heavy metal complex wastewater of the present invention to carry out wastewater treatment, its steps are:

[0043] Add ferric nitrate according to the iron-copper molar ratio of 6:1, mix for 10 minutes, and use a light intensity of 6mW / cm 2 Irradiate with a medium-pressure mercury lamp for 10 minutes, add sodium hydroxide to adjust the pH of the water to 9-10, and let it settle.

[0044] The remaining copper concentration in the final water body is about 0.7mg / L, the removal rate is about 96.4%, and the total organic carbon removal rate in water is about 30%.

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Abstract

A combined process for treating heavy metal complexing waste water is disclosed and belongs to the field of waste water treatment. The combined process includes steps of: (1) adding a ferric salt into the complexing waste water containing the target heavy metal to subject the ferric salt and the target heavy metal to a replacement reaction so as to release a target ion; (2) subjected the waste water after replacement to ultraviolet light irradiation to destroy complexes in the waste water; and (3) adjusting the pH value of the waste water to precipitate the target metal and iron, performing solid liquid separation to complete the processing process of the waste water. The combined process mainly destroys carboxyl of a complexing agent, so that the combined process has certain selectivity. Compared with methods in the prior art that degrade organic matters by utilization of hydroxyl radicals, the combined process has higher selectivity. When the content of a complexing mechanism in the total organic matters is not high, the combined process can maintain a high utilization rate.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and more specifically relates to a combined process for treating heavy metal complex wastewater. Background technique [0002] The rapid development of electroplating, printed circuit board and other industries has produced a large amount of heavy metal wastewater. The production processes of these industries often use a wide variety of additives and complexing agents such as EDTA, NTA, tartaric acid, etc., so that a considerable part of heavy metals exist in the form of complexes , which greatly increases the difficulty of wastewater treatment; and a considerable part of the heavy metal wastewater discharged from industries such as tanning and mining exists in a complex state. Commonly used heavy metal wastewater treatment technologies such as chemical precipitation, adsorption and micro-electrolysis have considerable challenges both technically and economically for the treatment of heavy met...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/20
Inventor 潘丙才徐喆任杰吕路张炜铭张淑娟
Owner NANJING UNIV
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