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Deep defluorination system and method for electroplating wastewater

A technology of electroplating wastewater and fluorine system, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of difficult discharge of fluoride, increase the cost of wastewater treatment, and high fluoride ion concentration, and improve the treatment efficiency. and social and economic benefits, improve the efficiency of fluoride removal, and reduce the effect of fluoride content

Pending Publication Date: 2017-12-19
惠州金茂源环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the electroplating enterprises in the park have different electroplating processes, the electroplating agents used are different, and the water quality is very complicated.
At present, the number of aluminum alloy and zinc alloy enterprises in the electroplating industrial park has increased sharply, and a large number of high-concentration hydrofluoric acid, ammonium bifluoride, and ammonium fluoride are used to pickle the products. , making it difficult to meet emission standards for fluoride

Method used

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  • Deep defluorination system and method for electroplating wastewater
  • Deep defluorination system and method for electroplating wastewater
  • Deep defluorination system and method for electroplating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The adsorption sedimentation tank 121 uses activated alumina and activated carbon as adsorbents;

[0063] The process parameters of the primary sedimentation tank 122 are as follows: add polyacrylamide aqueous solution, and the mass ratio of polyacrylamide to water is 2:1000;

[0064] The process parameters of the inorganic aluminum salt reaction tank 123 are: the inorganic aluminum salt used is aluminum sulfate, the dosage of aluminum sulfate is 1.0g / L waste water, and the reaction time is 30 minutes;

[0065] The technological parameters of the secondary sedimentation tank 124 are as follows: add polyacrylamide aqueous solution, and the mass ratio of polyacrylamide to water is 2:1000.

[0066] other same figure 1 As shown in the schematic diagram, the comparison of data before and after treatment is shown in Table 1.

[0067] Table 1. Data before and after deep defluorination of electroplating wastewater (dosing amount of aluminum sulfate: 1.0g / L wastewater)

[006...

Embodiment 2

[0071] The adsorption sedimentation tank 121 uses activated alumina and activated carbon as adsorbents;

[0072] The process parameters of the primary sedimentation tank 122 are as follows: add polyacrylamide aqueous solution, and the mass ratio of polyacrylamide to water is 2:1000;

[0073] The process parameters of the inorganic aluminum salt reaction tank 123 are: the inorganic aluminum salt used is aluminum sulfate, the dosage of aluminum sulfate is 1.5g / L waste water, and the reaction time is 30 minutes;

[0074] The technological parameters of the secondary sedimentation tank 124 are as follows: add polyacrylamide aqueous solution, and the mass ratio of polyacrylamide to water is 2:1000.

[0075] other same figure 1 As shown in the schematic diagram, the comparison of data before and after treatment is shown in Table 2.

[0076] Table 2. Data before and after deep defluorination of electroplating wastewater (dosing amount of aluminum sulfate: 1.5g / L wastewater)

[007...

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Abstract

The invention discloses a deep defluorination system and method for electroplating wastewater. The system comprises a biochemical treatment unit and a deep defluorination unit which are connected in sequence. The method comprises the following steps: S1, performing biochemical treatment on the electroplating wastewater; S2, performing deep defluorination treatment on the electroplating wastewater subjected to the biochemical treatment in S1, wherein the electroplating wastewater subjected to the deep defluorination treatment can meet the standard and then be discharged. According to the deep defluorination system and the deep defluorination method for the electroplating wastewater, procedures of dephosphorizing the electroplating wastewater by using a biochemical active sludge method and then performing adsorption precipitation are added, so that fluorinions are preliminarily removed; furthermore, through the adoption of a deep defluorination treatment process, preliminary precipitation treatment is carried out firstly by using a polyacrylamide aqueous solution, then chemical precipitation is carried out by jointly using calcium salt and aluminum salt, and finally secondary precipitation treatment is carried out by using the polyacrylamide aqueous solution, so that the fluoride content is effectively reduced, the discharge of fluoride in the electroplating wastewater is avoided, the electroplating wastewater treatment efficiency and the social and economical benefits are improved, clean production, energy conservation and emission reduction are achieved, and pollution to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of electroplating wastewater treatment, in particular to a deep defluorination system and method for electroplating wastewater. Background technique [0002] Electroplating is a process that uses electrochemical methods to decorate, protect and obtain certain new properties on metal and non-metal surfaces. In order to ensure the quality of electroplating products, the metal coating has a smooth and good appearance and is firmly bonded to the substrate. In combination, the dirt (oil, rust, scale, etc.) on the surface of the plated parts must be thoroughly cleaned before plating, and the adhesion liquid on the surface of the plated parts must be cleaned after plating. Therefore, a large amount of waste water must be discharged in the general electroplating production process. The water quality and quantity of electroplating wastewater are related to the process conditions of electroplating production, product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/14C02F103/16
CPCC02F9/00C02F2301/08C02F3/30C02F2103/16C02F2101/14C02F1/281C02F1/56C02F1/5245
Inventor 龚波杨柽瀚林贵彪邹丽娜
Owner 惠州金茂源环保科技有限公司
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