Efficient treatment method for electroplating nickel-containing waste water

A treatment method and technology for nickel wastewater, applied in the field of electroplating wastewater treatment and high-efficiency treatment of electroplating nickel-containing wastewater, can solve problems such as difficulty in reaching the standard stably, high operating costs, membrane blockage, etc., and save processing time and floor space. , the reaction conditions are low, the effect of reducing energy input

Inactive Publication Date: 2016-07-27
李小琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the chemical treatment method includes neutralization precipitation method, sulfide precipitation method and ferrite method. The chemical treatment method has simple process flow, convenient operation and mature technology. It is one of the most commonly used methods, but the chemical treatment method occupies a large area and is It is difficult to meet the standard stably; the ion exchange method has a good effect on recovering valuable nickel in wastewater and improving the recycling rate of water, but its operation process is relatively complicated, and ion exchange resins are often damaged due to the influence of other organic pollutants. The shortening of life affects the treatment effect of the whole system; the adsorption method is a method of removing heavy metal ions by using the unique structure of the adsorbent. Zeolite, activated carbon, humic acid, etc. are often used as adsorbe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Taking electroplating wastewater from a factory in Yiyang as the treatment object, the raw water quality: total nickel is 350mg / L, pH is 1.5, total copper is 40mg / L, COD=1496.5mg / L.

[0028] Utilize treatment method described in the present invention to process this electroplating waste water:

[0029] The raw water of electroplating wastewater enters the micro-electrolysis reactor for aeration and micro-electrolysis. When the reaction reaches a pH of 4.0, sodium hypochlorite is added to the wastewater, and the amount of sodium hypochlorite added is 3mL / L. The wastewater was subjected to micro-electrolysis for the second time in the reactor for 40 minutes. Add a sodium hydroxide solution with a mass fraction of 30% to the waste water that has completed the secondary micro-electrolysis, mix well, make the pH of the mixed solution 10.5, add PAC and PAM for coagulation and precipitation, and let it stand for 30 minutes. The final supernatant obtained is Up to standard dis...

Embodiment 2

[0032] Taking high-concentration nickel-plating wastewater from a factory in Baiyun District, Guangzhou as the treatment object, the raw water quality: total nickel is 400mg / L, pH is 1.5, COD=1078.0mg / L.

[0033] Utilize treatment method described in the present invention to process this electroplating waste water:

[0034] The raw water of the electroplating wastewater enters the micro-electrolysis reactor for aeration and micro-electrolysis. When the reaction reaches a pH of 4.5, sodium hypochlorite is added to the wastewater. The amount of sodium hypochlorite added is 3mL / L. The wastewater was subjected to micro-electrolysis for the second time in the reactor for 40 minutes. Add a sodium hydroxide solution with a mass fraction of 30% to the waste water that has completed the secondary micro-electrolysis, mix well, make the pH of the mixed solution 10.5, add PAC and PAM for coagulation and precipitation, and let it stand for 30 minutes. The final supernatant obtained is Up ...

Embodiment 3

[0037] Taking the comprehensive water of electroplating wastewater from a factory in Baiyun District, Guangzhou as the treatment object, the raw water quality: total nickel is 150mg / L, pH is 1.5, COD=415.3mg / L.

[0038] The raw water of the electroplating wastewater enters the micro-electrolysis reactor for aeration and micro-electrolysis. When the reaction reaches a pH of 4.5, sodium hypochlorite is added to the wastewater. The amount of sodium hypochlorite added is 3mL / L. The wastewater was subjected to micro-electrolysis for the second time in the reactor for 40 minutes. Add a sodium hydroxide solution with a mass fraction of 30% to the waste water that has completed the secondary micro-electrolysis, mix well, make the pH of the mixed solution 10.5, add PAC and PAM for coagulation and precipitation, and let it stand for 30 minutes. The final supernatant obtained is Up to standard discharge of waste water.

[0039] A water sample of the final supernatant was taken for total...

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Abstract

The invention discloses an efficient treatment method for electroplating nickel-containing waste water.The method comprises the following steps that 1, under the acidic condition, the electroplating nickel-containing waste water is subjected to a microelectrolysis reaction in a microelectrolysis reactor till the pH value of the electroplating nickel-containing waste water ranges from 4.0 to 5.0; 2, an oxidizing agent is added, and the electroplating nickel-containing waste water is subjected to secondary microelectrolysis in the microelectrolysis reactor continuously; 3, an alkaline solution is added, and the pH value of the electroplating nickel-containing waste water ranges from 9.5 to 11.0; 4, coagulant and flocculant are added to the electroplating nickel-containing waste water in sequence for coagulating sedimentation, and final supernate is treated waste water capable of being discharged.The efficient treatment method for the electroplating nickel-containing waste water is easy to operate and stable in effect, chemicals such as a heavy metal chelating agent and sodium sulfide which are bad for the environment do not need to be added, and secondary pollution to environment is avoided; the occupied area is saved, the requirements on reaction conditions are low, the waste water pH can be increased in the reaction process, the alkali quantity needed by follow-up alkali adjustment is decreased, and a product obtained through treatment can be recycled.

Description

technical field [0001] The invention relates to a treatment method for electroplating wastewater, in particular to an efficient treatment method for electroplating nickel-containing wastewater, which belongs to the technical field of wastewater treatment. Background technique [0002] As a common heavy metal ion in electroplating industry wastewater, nickel has greatly promoted the development of my country's economy and society. Although nickel is one of the trace elements necessary for living things, excessive nickel can retard the growth and development of plants, cause poor plant growth, cause harm to plants, and even die. At the same time, nickel can accumulate in plants, and when plants exceeding normal levels enter the food chain, it will affect the health of animals and even humans. Nickel can form nickel carbonyl with carbonyl compounds in water, which is highly toxic and an internationally recognized carcinogen. If electroplating nickel-containing sewage is disch...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/16
CPCC02F9/00C02F1/461C02F1/5245C02F1/56C02F1/66C02F1/76C02F2103/16C02F2301/08
Inventor 李小琴
Owner 李小琴
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