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A method for treating formaldehyde wastewater by using calcined hydrotalcite

A technology for roasting hydrotalcite and formaldehyde wastewater, which is applied in the field of water treatment, can solve the problems of easy loss of aluminum ions, pipe scaling, inconvenience, etc., and achieve the effect of good regeneration performance, good tolerance and convenient operation

Active Publication Date: 2016-08-24
POTEN ENVIRONMENT GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the lime catalysis method is used, the lime needs to be prepared into an emulsion solution before use, and it needs to be prepared immediately after use, which is very inconvenient. Not only that, during the treatment process, the soluble calcium, magnesium, and aluminum ions are easily lost, resulting in pipelines Scaling, fouling and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Calcium-aluminum hydrotalcite of industrial grade (CaAl-LDH) (Shaoyang Tiantang Auxiliary Chemical Co., Ltd., nano-synthesized calcium-aluminum hydrotalcite, calcium-aluminum ratio of 2:1) was roasted in a muffle furnace at 400°C 6h, using calcium aluminum hydrotalcite (CaAl-LDO) after roasting as the catalyst for processing formaldehyde wastewater;

[0035] (2) Get 200ml of formaldehyde wastewater water sample to be treated, and adjust the pH value of the water sample to 11.9 with NaOH to obtain alkaline formaldehyde wastewater;

[0036] (3) Weigh 0.4g calcareous aluminum hydrotalcite (CaAl-LDO) after roasting, add it to the alkaline formaldehyde wastewater water sample, seal the container containing the formaldehyde water sample, and react in a water bath shaker at 90°C for 120min After the reaction, the formaldehyde wastewater was cooled to room temperature.

[0037] Source of formaldehyde wastewater: from a high-concentration formaldehyde-containing wastewater ...

Embodiment 2

[0040] (1) The industrial grade magnesium aluminum hydrotalcite (MgAl-LDH) (Shanghai Weipu Chemical Technology Service Co., Ltd., nano-synthesized magnesium aluminum hydrotalcite, the ratio of magnesium to aluminum is 3:1) was roasted in a muffle furnace at 450 °C 4h, using the calcined magnesium aluminum hydrotalcite (MgAl-LDO) as the catalyst for processing formaldehyde wastewater;

[0041] (2) Take 200ml of formaldehyde wastewater water sample to be treated, and adjust the pH value of the water sample to 9.8 with NaOH to obtain alkaline formaldehyde wastewater, and place the alkaline formaldehyde wastewater in a water bath to preheat to 90°C;

[0042] (3) Weigh 1.2g of calcined magnesium aluminum hydrotalcite (MgAl-LDO), add it to the preheated formaldehyde wastewater water sample, seal the container containing the formaldehyde water sample, and place it in a water bath shaker at 90°C React for 180 minutes, and after the reaction is completed, the formaldehyde wastewater is...

Embodiment 3

[0045] (1) Calcium-aluminum hydrotalcite of industrial grade (CaAl-LDH) (Shaoyang Tiantian Auxiliary Chemical Co., Ltd., nano-synthesized calcium-aluminum hydrotalcite, calcium-aluminum ratio of 3:1) was roasted in a muffle furnace at 500°C 5h, with calcium aluminum hydrotalcite (CaAl-LDO) after roasting as the catalyst of processing formaldehyde waste water;

[0046] (2) Take 200ml of formaldehyde wastewater water sample to be treated, and adjust the pH value of the water sample to 10.4 with NaOH to obtain alkaline formaldehyde wastewater, and place the alkaline formaldehyde wastewater in a water bath to preheat to 60°C;

[0047] (3) Weigh 0.5g calcined aluminum hydrotalcite (CaAl-LDO) and add it to the preheated formaldehyde wastewater water sample, seal the container containing the formaldehyde water sample, and react in a water bath shaker at 80°C After 60 minutes, the formaldehyde wastewater was cooled to room temperature after the reaction.

[0048] Source of formaldehy...

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PUM

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Abstract

The embodiment of the invention discloses a method for treating formaldehyde wastewater by use of calcined hydrotalcite. The method comprises the following steps: based on the calcined hydrotalcit as a catalyst for treating the formaldehyde wastewater, regulating the pH value of the formaldehyde wastewater to be treated to an alkaline range, thereby obtaining alkaline formaldehyde wastewater; adding the calcined hydrotalcit to the alkaline formaldehyde wastewater, and performing formaldehyde wastewater treatment under a reaction condition of 60-100 DEG C; and finishing the treatment when the formaldehyde content of the formaldehyde wastewater is smaller than a preset threshold. According to the technical scheme of the method, the formaldehyde removal rate can be above 95%. The calcined hydrotalcit, which is taken as the catalyst for treating the formaldehyde wastewater, is good in tolerance and regenerability, and can be filtered and separated easily. Compared with the prior art, the catalyst can be prepared before use, and is convenient to use; no soluble calcium, magnesium and aluminum ions are generated, and therefore, the problems of pipeline scaling, sewage blocking and the like can be avoided.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for treating formaldehyde wastewater by using calcined hydrotalcite. Background technique [0002] Formaldehyde is an important chemical reagent, which is used in resin, plastic, leather, paper, fiber, paint, coating, pesticide, medicine and other fields. When formaldehyde is used in the above fields, a large amount of waste water containing formaldehyde will be produced. Referred to as formaldehyde wastewater. Since formaldehyde has an inhibitory effect on the growth of microorganisms, if the formaldehyde wastewater enters the treatment unit of the wastewater treatment plant directly without treatment, it is not only difficult for the treatment unit of the wastewater treatment plant to dispose of it, but also makes the active sludge in the treatment unit Microbial poisoning will affect the water treatment effect. If the formaldehyde wastewater is discharged directly, it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 乔瑞平耿翠玉俞彬陈广升
Owner POTEN ENVIRONMENT GRP