Simple and convenient method for improving the efficiency of cadmium plating rinsing wastewater on-line resource recovery membrane process closed system

A closed-system and resource-recycling technology is applied in the field of improving the efficiency of the closed system of the membrane method for on-line recycling of cadmium-plating rinsing wastewater, which can solve the problems of needing to stop for cleaning, secondary pollution of waste liquid, etc., so as to prevent the formation of complex pollution and save economic costs. , the effect of reducing economic operating costs

Inactive Publication Date: 2017-01-04
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, the chemical cleaning method has the following disadvantages: it needs to stop for cleaning; every time it needs to add cleaning agent; after cleaning, the waste liquid will cause secondary pollution

Method used

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  • Simple and convenient method for improving the efficiency of cadmium plating rinsing wastewater on-line resource recovery membrane process closed system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Ethylenediamine tetramethylene phosphonate potassium crystals are added to the regulating tank of the closed system of membrane method for online recycling of cadmium plating rinse wastewater. After the addition, the concentration on the concentrated side of the reverse osmosis membrane in the system is 1.0 ppm. The complex physical and chemical polymerization process of cadmium sulfate, β-naphthalene disulfonic acid, and gelatin in the cadmium solution, especially breaks the core role of β-naphthalene disulfonic acid, prevents the formation of inorganic and organic compound pollution, and maintains a high level for a long time Membrane flux, improving the performance of the closed system of membrane method for online recycling of cadmium-plating rinse wastewater, and reducing economic operating costs.

[0027] Implementation effect of this embodiment:

[0028] 1. Potassium ethylene diamine tetramethylene phosphonate additive can inhibit the complex physical and chemica...

Embodiment 2

[0033]Add ethylenediamine tetramethylene phosphonate potassium solution to the electroplating tank in the closed system of cadmium-plating rinse wastewater on-line resource recycling membrane method. The complex physical and chemical polymerization process of cadmium sulfate, β-naphthalene disulfonic acid, and gelatin in the cadmium solution, especially breaks the core role of β-naphthalene disulfonic acid, prevents the formation of inorganic and organic compound pollution, and maintains a high level for a long time Membrane flux, improving the performance of the closed system of membrane method for online recycling of cadmium-plating rinse wastewater, and reducing economic operating costs.

[0034] Implementation effect of this embodiment:

[0035] 1. Potassium ethylene diamine tetramethylene phosphonate additive can inhibit the complex physical and chemical polymerization process of cadmium sulfate, β-naphthalene disulfonic acid and gelatin in the cadmium plating solution, e...

Embodiment 3

[0040] Ethylenediamine tetramethylene phosphonate potassium solution is added to the regulating tank in the closed system of cadmium-plating rinse wastewater online recycling membrane method. After the addition, the concentration on the concentrated side of the reverse osmosis membrane in the system is 100.0ppm. The complex physical and chemical polymerization process of cadmium sulfate, β-naphthalene disulfonic acid, and gelatin in the cadmium solution, especially breaks the core role of β-naphthalene disulfonic acid, prevents the formation of inorganic and organic compound pollution, and maintains a high level for a long time Membrane flux, improving the performance of the closed system of membrane method for online recycling of cadmium-plating rinse wastewater, and reducing economic operating costs.

[0041] Implementation effect of this embodiment:

[0042] 1. Potassium ethylene diamine tetramethylene phosphonate additive can inhibit the complex physical and chemical polym...

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Abstract

The invention relates to a simple and convenient method for improving the efficiency of a cadmium plating rinsing wastewater on-line resource recovery membrane process closed system. The method is characterized in that potassium ethylene diamine tetra methylene phosphonic acid is added into the cadmium plating rinsing wastewater on-line resource recovery membrane process closed system; for the addition quantity, the concentration at the membrane concentration side in the system is 1.0 to 100ppm. Compared with the prior art, the method has the advantages that the performance of the cadmium plating rinsing wastewater on-line resource recovery membrane process closed system is greatly improved; the cost is reduced; the continuous implementation is realized; the secondary pollution cannot be formed, and the like.

Description

technical field [0001] The invention relates to the field of environmental protection, and in particular relates to a simple and convenient method for improving the efficiency of a closed system of membrane method for online recycling of cadmium-plating rinse wastewater. Background technique [0002] Electroplating is an important process link in the manufacturing industry, and the composition of the discharged wastewater is complex. The average annual discharge of electroplating wastewater in my country is as high as 4 billion tons, of which rinsing wastewater accounts for 80%, about 3.2 billion tons. Cadmium plating is a major type of plating in my country, and the corresponding cadmium-plating rinse wastewater is also a large amount of electroplating rinse wastewater. In addition to heavy metal pollutants containing cadmium ions, it also contains a considerable amount of organic compounds such as additives and brighteners. These chemical substances will inevitably cause ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C25D21/20
CPCC02F9/00C02F1/00C02F1/001C02F1/048C02F1/441C02F1/442C02F2103/16C02F2301/08C25D21/20
Inventor 靳强
Owner SHANGHAI JIAO TONG UNIV
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