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Formaldehyde wastewater pretreatment method

A formaldehyde wastewater and pretreatment technology, applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc., can solve problems such as pipeline scaling, achieve low operating costs, fewer operators, and save energy Effect of Labor and Wastewater Treatment Costs

Inactive Publication Date: 2021-03-09
JIANGSU JINBIYUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] 3. The hardness of the effluent treated by this method is much lower than that of the lime method, which solves the serious scaling of equipment and pipelines in the pretreatment process and the impact of high calcium salt concentration on the subsequent biochemical treatment bacteria;

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The sample was taken from glyoxal production wastewater: formaldehyde content 6200mg / l, COD8879mg / l, total salt 2140mg / l, pH4.07, hardness 50mg / l.

[0053] The glyoxal production wastewater is input to the formaldehyde wastewater collection pool, NaOH is added to the formaldehyde wastewater collection pool to adjust the pH value of the formaldehyde wastewater to 13, and 7.2T of CaCO3 is added to the formaldehyde wastewater catalytic reaction tower. The glyoxal production wastewater is heated to 65°C by the heating device, and then input into the formaldehyde wastewater catalytic reaction tower through the metering pump (according to the flow rate of 600kg / h) for reaction. After 4 hours of effective reaction, the water sample turns orange (indicating formaldehyde poly sugar reaction is complete). Sampling and analysis showed that the concentration of formaldehyde in the effluent was 5.8mg / l, the removal rate of formaldehyde was 99.5%, the COD was 8120mg / l, and the hardne...

Embodiment 2

[0055] The sample was taken from glyoxal production wastewater: formaldehyde content 6200mg / l, COD8879mg / l, total salt 2140mg / l, pH4.07, hardness 50mg / l.

[0056] Input the glyoxal production wastewater into the formaldehyde wastewater collection pool, add NaOH to the formaldehyde wastewater collection pool to adjust the pH value of the formaldehyde wastewater to 13, and add 12T of CaCO3 in the formaldehyde wastewater catalytic reaction tower. The glyoxal production wastewater is heated to 65°C by the heating device, and then input into the formaldehyde wastewater catalytic reaction tower through the metering pump (according to the flow rate of 1T / h) for reaction. After 4 hours of effective reaction, the water sample turns orange (indicating that formaldehyde sugar reaction is complete). Sampling and analysis showed that the concentration of formaldehyde in the effluent was 7.2mg / l, the removal rate of formaldehyde was 99.5%, the COD was 8450mg / l, and the hardness was 50mg / l. ...

Embodiment 3

[0058] The sample was taken from glyoxal production wastewater: formaldehyde content 6200mg / l, COD8879mg / l, total salt 2140mg / l, pH4.07, hardness 50mg / l.

[0059] Input the glyoxal production wastewater into the formaldehyde wastewater collection pool, add NaOH to the formaldehyde wastewater collection pool to adjust the pH value of the formaldehyde wastewater to 12, and add 72T of CaCO3 in the formaldehyde wastewater catalytic reaction tower (the production of formaldehyde is not avoided in the actual construction The difficulty brought about by the excessive size of the wastewater catalytic reaction tower can make 6 formaldehyde wastewater catalytic reaction towers with a capacity of 12T in parallel for processing). The glyoxal production wastewater is heated to 68°C by the heating device, and then input into the formaldehyde wastewater catalytic reaction tower through the metering pump (according to the flow rate of 6T / h) for reaction. After 4.5 hours of effective reaction, ...

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Abstract

A formaldehyde wastewater pretreatment method is disclosed and comprises the following steps: (1) inputting formaldehyde-containing wastewater into a formaldehyde wastewater collection tank, and adding liquid caustic soda into the formaldehyde wastewater collection tank to adjust the pH value of the formaldehyde wastewater to 11-13, and (2) preheating the formaldehyde wastewater of which the pH value is adjusted through a heating device, preheating the formaldehyde wastewater to 60-80 DEG C, inputting the preheated formaldehyde wastewater into a formaldehyde wastewater catalytic reaction tower, presetting calcium carbonate in the formaldehyde wastewater catalytic reaction tower, and performing glycan reaction on formaldehyde and liquid caustic soda under the catalytic action of the calciumcarbonate to obtain a glycan product, and a metering pump is arranged on a pipeline for connecting the heating device with the formaldehyde wastewater catalytic reaction tower, the metering pump controls the preheated formaldehyde wastewater to enter the formaldehyde wastewater catalytic reaction tower, and the retention time of the formaldehyde wastewater in the formaldehyde wastewater catalyticreaction tower for glycan reaction is 3-5 hours.

Description

technical field [0001] The invention belongs to the technical field related to sewage treatment, and in particular relates to a pretreatment method for formaldehyde wastewater. Background technique [0002] As an important industrial raw material, formaldehyde is widely used in paint, coating, medicine, chemical industry and other fields. Due to the high toxicity of formaldehyde, it is listed as a class I carcinogen. It will directly react with the protein, DNA, and RNA in the microorganism, causing the death of the microorganism or inhibiting its biological activity. When the formaldehyde content exceeds 200mg / L, the biochemical treatment of wastewater Microbial activity is almost completely inhibited during the process, so the treatment of formaldehyde wastewater is strictly regulated, and the development of its wastewater treatment technology is also highly valued by the industry. Therefore, high-concentration formaldehyde wastewater must undergo appropriate pretreatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/34
CPCC02F9/00C02F1/02C02F1/00C02F1/66C02F2101/34
Inventor 吴洪伟韩俊海吴敏意王加旺王建伦贺本相
Owner JIANGSU JINBIYUAN ENVIRONMENTAL PROTECTION TECH
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