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Precise electroplating wastewater treatment system capable of performing quality-based treatment according to characteristics of electroplating wastewater

A technology for the treatment of electroplating wastewater, which is applied in metallurgical wastewater treatment, water/sewage treatment, water treatment parameter control, etc. It can solve the problem of heavy metal pollution, which is highly toxic and difficult to eliminate, and the damage to the electroplating wastewater environment is difficult to be effectively treated, etc. problems, to achieve effective governance and ensure utilization

Pending Publication Date: 2022-06-21
湖北鑫嘉鸿诚环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heavy metal pollution is highly toxic and is a non-degradable conservative substance, that is, it will only transfer in the natural environment and is difficult to eliminate, making it difficult to effectively treat the damage to the environment caused by electroplating wastewater. At the same time, it is difficult to effectively recycle and use electroplating wastewater , resulting in a large waste of water resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A precise treatment system for electroplating wastewater according to the characteristics of electroplating wastewater, comprising the following steps:

[0031] Under acidic conditions, the reducing agent NaHSO3 is added to the chromium-containing wastewater, so that Cr6+ in the water is reduced to Cr3+, the pH of the wastewater is adjusted to alkaline, and Cr3+ is formed into insoluble Cr(OH)3 and removed, the Cr6+ is reduced to Cr3+ The chemical reaction formula is:

[0032] 2H2Cr2O7+6NaHSO3+3H2SO4→2Cr2(SO4)3+3Na2SO4+8H20Cr2(SO4)3+6NaOH→2Cr(OH)3↓+3Na2S04.

[0033] Treatment steps: Cr6+ reduction The reduction rate of Cr6+ depends on the reaction time, the pH value of the wastewater, the dosage of the reducing agent and other factors. The pH value of the wastewater is low, which is conducive to the reduction of Cr6+, while when the pH>3, the reaction speed becomes very slow. , Considering that the too low pH value causes large acid consumption, increases the processin...

Embodiment 2

[0050] This implementation of a precise treatment system for electroplating wastewater according to the characteristics and quality of electroplating wastewater is the same as implementation 1, and the difference is only that it includes the following steps:

[0051] Under acidic conditions, the reducing agent NaHSO3 is added to the chromium-containing wastewater, so that Cr6+ in the water is reduced to Cr3+, the pH of the wastewater is adjusted to alkaline, and Cr3+ is formed into insoluble Cr(OH)3 and removed, the Cr6+ is reduced to Cr3+ The chemical reaction formula is:

[0052] 2H2Cr2O7+6NaHSO3+3H2SO4→2Cr2(SO4)3+3Na2SO4+8H20Cr2(SO4)3+6NaOH→2Cr(OH)3↓+3Na2S04.

[0053] Treatment steps: Cr6+ reduction The reduction rate of Cr6+ depends on the reaction time, the pH value of the wastewater, the dosage of the reducing agent and other factors. The pH value of the wastewater is low, which is conducive to the reduction of Cr6+, while when the pH>3, the reaction speed becomes very s...

Embodiment 3

[0070] This implementation of a precise treatment system for electroplating wastewater according to the characteristics and quality of electroplating wastewater is the same as implementation 1, and the difference is only that it includes the following steps:

[0071] Under acidic conditions, the reducing agent NaHSO3 is added to the chromium-containing wastewater, so that Cr6+ in the water is reduced to Cr3+, the pH of the wastewater is adjusted to alkaline, and Cr3+ is formed into insoluble Cr(OH)3 and removed, the Cr6+ is reduced to Cr3+ The chemical reaction formula is:

[0072] 2H2Cr2O7+6NaHSO3+3H2SO4→2Cr2(SO4)3+3Na2SO4+8H20Cr2(SO4)3+6NaOH→2Cr(OH)3↓+3Na2S04.

[0073] Treatment steps: Cr6+ reduction The reduction rate of Cr6+ depends on the reaction time, the pH value of the wastewater, the dosage of the reducing agent and other factors. The pH value of the wastewater is low, which is conducive to the reduction of Cr6+, while when the pH>3, the reaction speed becomes very s...

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Abstract

The invention discloses an electroplating wastewater precise treatment system capable of performing quality-based treatment according to electroplating wastewater characteristics, and particularly relates to the technical field of wastewater treatment. Aiming at the characteristics of the electroplating wastewater, a corresponding wastewater treatment method is adopted; the method comprises the following steps: performing acidification reduction and flocculation precipitation on chromium-containing wastewater, performing two-stage cyanide breaking and flocculation precipitation on cyanide-containing wastewater, performing Fenton oxidation and flocculation precipitation on chemical nickel-plating wastewater, performing flocculation precipitation on nickel-electroplating wastewater, and performing oil separation, flocculation precipitation, filtration and adsorption on acid-alkali wastewater. After the electroplating wastewater is treated by the process, the electroplating wastewater can be recycled as reclaimed water after being treated by a process combining microfiltration, ultrafiltration and reverse osmosis, so that the effect of synchronously treating different electroplating wastewater is realized, and the electroplating wastewater treatment system can be used for treating the electroplating wastewater in a classified collection and quality-divided treatment manner according to the characteristics of the electroplating wastewater; therefore, an effective treatment effect on the electroplating wastewater is achieved, and meanwhile, the utilization rate of the electroplating wastewater is guaranteed.

Description

technical field [0001] The present invention relates to the technical field of wastewater treatment, and more particularly, the present invention relates to a precise treatment system for electroplating wastewater, which is treated according to the characteristics of electroplating wastewater. Background technique [0002] Electroplating wastewater is a kind of wastewater with a certain amount of acid, alkali, heavy metal ions and other toxic substances produced in the process of electroplating. The water quality of electroplating wastewater is complex, in which cyanide is a highly toxic substance, and heavy metal ions are also very toxic. , Since only 30% to 40% of all metals used in the electroplating process are effectively utilized, the electroplating process is one of the major heavy metal industrial pollutions. To mutated highly toxic substances, posing a serious threat to biological and human health. [0003] Untreated electroplating wastewater is discharged into riv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/22C02F103/16
CPCC02F9/00C02F1/70C02F1/705C02F1/66C02F1/722C02F1/56C02F1/5236C02F1/40C02F1/24C02F1/001C02F1/52C02F1/28C02F1/444C02F1/441C02F1/048C02F2103/16C02F2101/22C02F2209/06C02F2209/03C02F2209/44
Inventor 胡其木郑涛陈良超
Owner 湖北鑫嘉鸿诚环保科技有限公司
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