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A method for treating wastewater by coupling primary battery and electrocoagulation

A technology for wastewater treatment and electrocoagulation, applied in chemical instruments and methods, water/sewage treatment, water treatment parameter control, etc. Flocculation treatment results and other issues, to achieve the effect of promoting cathode mass transfer rate, improving electricity production performance, and improving wastewater treatment efficiency

Active Publication Date: 2021-07-27
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although electrocoagulation has the advantages of simple and easy-to-operate equipment, no need to add additional chemicals and no secondary pollution, but electrocoagulation still has great defects in the treatment of wastewater, such as easy passivation of electrodes and high energy consumption. Affected the treatment results of electrocoagulation
[0003] Aiming at the problem that electrocoagulation alone is easy to cause electrode passivation, existing scholars use micro-electrolysis and electrocoagulation to treat wastewater. However, when micro-electrolysis is used for wastewater treatment, iron-carbon fillers are easy to harden and Passivation, and when micro-electrolysis and electroflocculation are used in combination, it can only alleviate the compaction of micro-electrolysis filled particles, and cannot completely solve the compaction problem. After a long period of use, the problem of micro-electrolysis filled particles still remains Seriously, the efficiency of wastewater treatment will decrease accordingly

Method used

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  • A method for treating wastewater by coupling primary battery and electrocoagulation
  • A method for treating wastewater by coupling primary battery and electrocoagulation
  • A method for treating wastewater by coupling primary battery and electrocoagulation

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Treated wastewater: chromium-containing heavy metal wastewater is treated, and the total concentration of heavy metal ions is 500ppm.

[0016] The processing method includes the following steps:

[0017] (1) Using Na 2 SO 4 Adjust the conductivity of the wastewater to 1500us / cm, and adjust the pH value to 2, then use the iron electrode as the anode, the porous foam iron electrode as the cathode, and carry out the primary battery reaction with a distance of 1cm between the plates. During the reaction, the aeration reaction is carried out. The gas rate is 0.3L / min;

[0018] (2) When the primary battery reacts to the pH of the waste water to 6 (the primary battery has reacted for 80 minutes), the cathode and anode in the primary battery are powered on for electrocoagulation reaction for 20 minutes, and the current density in the electrocoagulation reaction is 4mA / cm 2 ;

[0019] (3) After the reaction, the treated wastewater was statically settled for 30 minutes, and...

Embodiment 2

[0032] Treated wastewater: cadmium-containing heavy metal wastewater is treated, and the total concentration of heavy metal ions is 200ppm.

[0033] The processing method includes the following steps:

[0034] (1) Using Na 2 SO 4 Adjust the conductivity of the wastewater to 500us / cm, and adjust the pH value to 3, then use the iron electrode as the anode, the porous nickel foam electrode as the cathode, and carry out the primary battery reaction with a distance of 2cm between the plates. During the reaction, aeration reaction is carried out. The gas rate is 0.6L / min;

[0035] (2) Treat the primary battery to react to the pH of waste water to 5 (the primary battery has reacted for 40 minutes), and at this moment, the negative electrode and the anode in the primary battery are powered on for electrocoagulation reaction for 20 minutes, and the current density in the electrocoagulation reaction is 6mA / cm 2 ;

[0036] (3) After the reaction, the treated waste water was statica...

Embodiment 3

[0049] Treated wastewater: Methyl orange wastewater is treated, and the total concentration of wastewater is 600ppm.

[0050] The processing method includes the following steps:

[0051] (1) Using Na 2 SO 4 Adjust the conductivity of the waste water to 1000us / cm, and adjust the pH value to 4, then use the iron electrode as the anode, the porous foam copper electrode as the cathode, and the distance between the plates is 3cm to carry out the original battery reaction. During the reaction, the aeration reaction is carried out. The gas rate is 1L / min;

[0052] (2) Treat the primary battery to react to the pH of waste water to 8 (the primary battery has reacted for 160min). At this time, the cathode and anode in the primary battery are powered on for electrocoagulation reaction for 20min. The current density in the electrocoagulation reaction is 5mA / cm 2 ;

[0053] (3) After the reaction, the treated waste water was statically settled for 15 minutes and centrifuged for 15 mi...

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Abstract

The invention discloses a method for treating waste water by using a primary battery and electric flocculation coupling, comprising the following steps: adjusting the conductivity of the waste water, and carrying out the primary battery reaction at a pH value of 2-10, and when the pH value of the waste water reaches 5-10, the The primary battery is powered on to carry out the electrocoagulation reaction, and the ratio of the time of the electrocoagulation reaction to the reaction time of the primary battery is 1:1-8. In the present invention, by coupling the primary battery with electroflocculation, on the one hand, the problem of filler compaction in the existing micro-electrolysis reaction is effectively avoided; on the other hand, the primary battery reaction can generate Fe 2+ and Fe 3+ , to provide abundant metal cations for the subsequent electrocoagulation reaction, combined with the electrocoagulation reaction, the floc production is effectively increased; in addition, the primary battery reaction generates electric energy, which outputs a higher power density for the electrocoagulation reaction and reduces power loss.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a method for treating waste water by coupling primary batteries and electrocoagulation. Background technique [0002] Electrocoagulation is a technology that uses electrolytic cells to treat wastewater. In the process of electroflocculation, the soluble metal anode electrolyzes to produce metal cations under the condition of electrification, and the cathode electrolyzes to produce H 2 And surface hydroxyl (OH), metal cations and surface hydroxyl combine in the electrolyte solution to form a series of mononuclear or multinuclear hydroxyl complexes and hydroxides, and finally form hydroxide flocs. These flocs have a large specific surface area and abundant surface hydroxyl groups, and can remove pollutants in water through net capture, adsorption bridging, and charge neutralization. Among them, the pollutants with higher density can be adsorbed by flocs and sink to the bottom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/463
CPCC02F1/46176C02F1/463C02F2201/4619C02F2209/05C02F2209/06
Inventor 陆君杨振婷陈晋徐秋玲徐凯
Owner JIANGSU UNIV OF SCI & TECH