Method for treating concrete by utilizing copper plating wastewater

A technology for wastewater treatment and concrete, applied in the field of corrosion resistance treatment of concrete structures, can solve problems such as corrosion, reduce pollution, prevent the production of biological sulfuric acid, and realize the effect of recycling waste resources

Active Publication Date: 2021-06-11
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current problem of microbial corrosion of concrete sewage pipelines, the present invention proposes a method for improving the antibacterial performance of concrete by using copper plating wastewater

Method used

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  • Method for treating concrete by utilizing copper plating wastewater
  • Method for treating concrete by utilizing copper plating wastewater
  • Method for treating concrete by utilizing copper plating wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The concentration of copper ions in the electrolyte is configured to be 5000mg / L.

[0042] Submerge the concrete with built-in steel bars 10 in the electrolyte, use the steel bars built in the concrete as cathodes, and use 13 pieces of titanium mesh as anodes, connect the electrochemical workstation 11 through copper wires 12, and perform electrodeposition, wherein the anode and concrete The distance is 30mm, the output voltage of the DC power supply is 30V, and the current density applied to the cathode by the DC power supply is 1.5mA / cm 2 , the first step of electrodeposition time is 48 hours. A layer of copper plating is deposited on the surface of the concrete by the first step of electrodeposition.

[0043] After the first step of electrodeposition, the concentration of copper ions in the electrolyte is reduced to 485mg / L, and lactic acid solution is added to the electrolyte. The concentration of lactic acid is 5 times the concentration of copper ions (molar ratio...

Embodiment 2

[0046] The concentration of copper ions in the electrolyte is configured to be 2000mg / L.

[0047] Immerse the concrete with built-in steel bars in the electrolyte, use the steel bars built in the concrete as the cathode, and use the titanium mesh as the anode to conduct electrodeposition. The distance between the anode and the concrete is 30mm, and the output voltage of the DC power supply is 30V. , the current density applied to the cathode by DC power supply is 1.5mA / cm 2 , the first step of electrodeposition time is 48 hours.

[0048] After the first step of electrodeposition, the concentration of copper ions in the electrolyte is reduced to 265mg / L, and lactic acid solution is added to the electrolyte. The concentration of lactic acid is 5 times the concentration of copper ions (molar ratio), and 1mol / L of NaOH is added to adjust the solution The pH is 11. Afterwards, pulse power supply was used for electrodeposition for 12 hours, the pulse frequency of the pulse power s...

Embodiment 3

[0050] Embodiment 3: The concentration of copper ions in the electrolyte is configured to be 500 mg / L.

[0051] Immerse the concrete with built-in steel bars in the electrolyte, use the steel bars built in the concrete as the cathode, and use the titanium mesh as the anode to conduct electrodeposition. The distance between the anode and the concrete is 30mm, and the output voltage of the DC power supply is 30V. , the current density applied to the cathode by DC power supply is 1.5mA / cm 2 , the first step of electrodeposition time is 48 hours.

[0052] After the first step of electrodeposition, the concentration of copper ions in the electrolyte is reduced to 95 mg / L, and lactic acid solution is added to the electrolyte. The concentration of lactic acid is 5 times the concentration of copper ions (molar ratio), and 1mol / L of NaOH is added to adjust the solution The pH is 11. Afterwards, pulse power supply was used for electrodeposition for 12 hours, the pulse frequency of the...

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Abstract

The invention discloses a method for treating concrete by utilizing copper plating wastewater. The method comprises the following steps of: A, sequentially carrying out sedimentation, acidification or alkalization treatment on copper industrial wastewater, adjusting the pH value of the waste liquid to 5-7, purifying and concentrating; B, adding a surfactant into the obtained wastewater treatment liquid according to the concentration of 100-200mg / L to prepare an electrolyte, wherein the concentration of copper ions in the electrolyte is 2000mg / L-5000mg / L; C, immersing a concrete test piece into the electrolyte, connecting an electrochemical device, and taking the electrochemical device as a cathode to carry out first-step electrodeposition; and D, after the first-step electrodeposition is finished, adding a lactic acid solution into the electroplating solution, adjusting the pH value to 10-12, and carrying out second-step electrodeposition. The bonding force between the prepared electrodeposition and the concrete matrix is higher; and the formed sediment has good sterilization performance, and the microbial corrosion resistance of the concrete is improved.

Description

technical field [0001] The invention belongs to the technical field of corrosion resistance treatment of concrete structures, and in particular relates to a method for treating concrete with copper plating wastewater. Background technique [0002] Microbial corrosion is one of the main causes of damage to concrete sewage pipelines. Sewage and the sludge layer accumulated at the bottom of the pipeline contain a large number of bacteria, among which sulfate-reducing bacteria and sulfate-oxidizing bacteria are extremely harmful to concrete. The sulfuric acid produced by their metabolism reacts with cement, on the one hand, it generates expansive ettringite and gypsum, which causes micro-cracks inside the concrete; on the other hand, the reaction consumes a large amount of Ca(OH) 2 , reduces the pH value of concrete and destroys the passivation film of steel bars. Concrete erosion caused by microorganisms not only causes huge economic losses, but also seriously damages the str...

Claims

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Application Information

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IPC IPC(8): C25D5/54C25D3/38C25D5/18
CPCC25D5/54C25D3/38C25D5/18
Inventor 储洪强朱正宇王琳宋子健郭明志蒋林华李怡
Owner HOHAI UNIV
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