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Treatment method of EDTA complexing nickel wastewater

A treatment method and technology for nickel wastewater, applied in water/sewage treatment, neutralized water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem that the total nickel in the effluent cannot meet the discharge standard, the wastewater treatment efficiency is low, and the network is broken. Insufficient and other problems, to achieve the effect of reducing electrolysis energy consumption and chemical consumption, reducing the amount, and reducing operating costs

Active Publication Date: 2021-02-12
中新联科环境科技(安徽)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a treatment method for EDTA-complexed nickel wastewater, which solves the technical problems of low wastewater treatment efficiency, insufficient network breaking, and the failure of total nickel in the effluent to meet the discharge standard in the prior art.

Method used

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  • Treatment method of EDTA complexing nickel wastewater
  • Treatment method of EDTA complexing nickel wastewater
  • Treatment method of EDTA complexing nickel wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The processing method of EDTA complexed nickel waste water specifically comprises the steps:

[0037] Step 1. Pretreat the EDTA-complexed nickel wastewater through an activated carbon filter, pump it into the acid analysis separation tank 1 of the complex nickel wastewater treatment device, adjust the pH value to 2, let it stand for 30 minutes, carry out acid analysis and separation of organic matter, and then filter Suspended solids are obtained for primary treatment of wastewater;

[0038] Step 2: Pump primary treated wastewater into the first electrolytic cell 2, pump ferrous sulfate solution into the first electrolytic cell 2 with a flow rate of 160L / h, and pump sodium hypochlorite solution into the first electrolytic cell 2 with a flow rate of 30L / h , pump hydrogen peroxide into the first electrolytic cell 2 with a flow rate of 18L / h, and set the current density of the titanium-based loaded lead dioxide electrode to be 10mA / cm 2 , control the oxidation-reduction p...

Embodiment 2

[0045] The processing method of EDTA complexed nickel waste water specifically comprises the steps:

[0046] Step 1. Pretreat the EDTA-complexed nickel wastewater through an activated carbon filter, pump it into the acid analysis and separation tank 1 of the complexed nickel wastewater treatment device, adjust the pH value to 3, let it stand for 30 minutes, carry out acid analysis and separation of organic matter, and then filter Suspended solids are obtained for primary treatment of wastewater;

[0047] Step 2: Pump primary treated wastewater into the first electrolytic cell 2, pump ferrous sulfate solution into the first electrolytic cell 2 with a flow rate of 170L / h, and pump sodium hypochlorite solution into the first electrolytic cell 2 with a flow rate of 35L / h , pump hydrogen peroxide into the first electrolytic cell 2 with a flow rate of 22L / h, and set the current density of the titanium-based loaded lead dioxide electrode to be 10mA / cm 2 , control the oxidation-reduc...

Embodiment 3

[0054] The processing method of EDTA complexed nickel waste water specifically comprises the steps:

[0055] Step 1. Pretreat the EDTA-complexed nickel wastewater through an activated carbon filter, pump it into the acid analysis and separation tank 1 of the complexed nickel wastewater treatment device, adjust the pH value to 4, let it stand for 30 minutes, carry out acid analysis and separation of organic matter, and then filter Suspended solids are obtained for primary treatment of wastewater;

[0056] Step 2: Pump primary treated wastewater into the first electrolytic cell 2, pump ferrous sulfate solution into the first electrolytic cell 2 with a flow rate of 180L / h, and pump sodium hypochlorite solution into the first electrolytic cell 2 with a flow rate of 40L / h , pump hydrogen peroxide into the first electrolytic cell 2 with a flow rate of 26L / h, and set the current density of the titanium-based loaded lead dioxide electrode to be 10mA / cm 2 , control the oxidation-reduc...

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Abstract

The invention discloses a treatment method of EDTA (Ethylene Diamine Tetraacetic Acid) complexing nickel wastewater. The treatment method specifically comprises the following steps: step 1, carrying out acid precipitation separation on organic matters; step 2, carrying out first-time decomplexing; step 3, carrying out second-time decomplexing; the invention belongs to the technical field of complex heavy metal wastewater treatment. Firstly, organic matters are acidified and separated to reduce the energy consumption and medicament consumption of subsequent treatment; by adding ferrous ions, the conductivity of complexing wastewater is improved, the generation rate of hydroxyl radicals is increased by adding hydrogen peroxide, the treatment efficiency is improved, chemicals such as sodium hypochlorite, ferrous sulfate and hydrogen peroxide are common chemicals, the price of the chemicals is low, and the operation cost of wastewater treatment can be reduced; according to the treatment method, complex nickel is stably removed through three times of complex breaking treatment, the nickel emission concentration of treated effluent is 0.2 mg / L or below, and the nickel removal rate reaches up to 99%.

Description

technical field [0001] The invention belongs to the technical field of complexed heavy metal wastewater treatment, and in particular relates to a treatment method for EDTA complexed nickel wastewater. Background technique [0002] The cleaning process after nickel plating in the process of plastic electroplating and metal electroplating will produce a large amount of nickel-containing wastewater. Nickel plating cleaning water has some unique characteristics: high nickel content, high content of complexing agents such as EDTA and citric acid, and wastewater conductivity Low efficiency and high ammonia nitrogen content, the traditional treatment process is not suitable for nickel complex wastewater, such as Fenton oxidation method, adsorption method, ion exchange method, cannot completely break the structure of β-EDTA-Ni complex, resulting in the discharge of nickel in the effluent The content is not up to the standard; the MVR evaporation method and the three-effect evaporati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/20
CPCC02F9/00C02F1/001C02F1/66C02F1/4672C02F2001/007C02F1/56C02F1/285C02F1/461C02F2101/20Y02P10/20
Inventor 吴文明王俊李海洋查晨王娣贠守宝李淑艳杨建
Owner 中新联科环境科技(安徽)有限公司
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