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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  • Abstract
  • Description
  • Claims
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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 proces

Method used

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  • A combined process for treating heavy metal complexing waste water

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Example Embodiment

[0030] Example 1

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

[0032] A combined process for treating heavy metal complex wastewater of the present invention is used for wastewater treatment, and the steps are:

[0033] Add ferric chloride according to the molar ratio of iron and copper 5:1, after mixing for 5 minutes, the light intensity is 6mW / cm 2 The medium pressure mercury lamp was irradiated for 6 minutes, calcium hydroxide was added to adjust the pH of the water body to 9-10, and the solution was left for precipitation.

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

Example Embodiment

[0035] Example 2

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

[0037] A combined process for treating heavy metal complex wastewater of the present invention is used for wastewater treatment, and the steps are:

[0038] Add ferric sulfate according to the molar ratio of iron and copper 6:1, after mixing for 10min, the light intensity is 6mW / cm 2 The medium pressure mercury lamp was irradiated for 8 minutes, calcium oxide was added to adjust the pH of the water body to 9-10, and the water was left to settle.

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

Example Embodiment

[0040] Example 3

[0041] The copper concentration in the solution to be treated was 19.2 mg / L and contained a slight excess of nitrilotriacetic acid.

[0042] A combined process for treating heavy metal complex wastewater of the present invention is used for wastewater treatment, and the steps are:

[0043] Ferric nitrate was added according to the molar ratio of iron and copper to 6:1, and after mixing for 10 minutes, the light intensity was 6mW / cm 2 The medium pressure mercury lamp was irradiated for 10 minutes, sodium hydroxide was added to adjust the pH of the water body to 9-10, and the solution was allowed to settle.

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