CN101613170A - A kind of method of handling high-concentration formaldehyde wastewater - Google Patents
A kind of method of handling high-concentration formaldehyde wastewater Download PDFInfo
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- CN101613170A CN101613170A CN200910182029A CN200910182029A CN101613170A CN 101613170 A CN101613170 A CN 101613170A CN 200910182029 A CN200910182029 A CN 200910182029A CN 200910182029 A CN200910182029 A CN 200910182029A CN 101613170 A CN101613170 A CN 101613170A
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Abstract
A kind of method of handling high-concentration formaldehyde wastewater belongs to the formaldehyde waste water processing technology field.The present invention handles with treatment agent calcium hydroxide or calcium oxide high-concentration formaldehyde wastewater, the mol ratio of calcium hydroxide or calcium oxide and formaldehyde is 20: 1～1: 20, temperature of reaction is 10～100 ℃, reaction times is 0.1～36 hour, continue again after the processing to handle formaldehyde-containing wastewater, realize that formaldehyde waste water reaches discharging or reuse requirement with biochemical process or other method.Use the present invention to handle formaldehyde waste water, particularly handle high-concentration formaldehyde wastewater, have that cost is low, simple to operate, processing speed is fast and characteristics such as processing efficiency height.
Description
Technical field
The present invention relates to handle the method for formaldehyde waste water, relate in particular to the method for handling high-concentration formaldehyde wastewater, belong to the formaldehyde waste water processing technology field.
Background technology
Formaldehyde (HCHO) is colourless, has the irritant gas of overpowering odor, slightly overweights air, and is soluble in water.Formaldehyde now is defined as carcinogenic and teratogenesis shape material by the World Health Organization as a kind of highly toxic material, is the allergen of generally acknowledging, also is one of strong mutagen of potential.
Formaldehyde waste water is mainly derived from Formaldehyde Production enterprise, be the enterprise etc. that produces formaldehyde in the enterprise such as chemical industry, material, agricultural chemicals of raw material and the production process with formaldehyde, concentration of formaldehyde is from tens～several ten thousand mg/L in the waste water.The processing formaldehyde waste water of efficient economy, significant to the Sustainable development of society.
At present, the PARA FORMALDEHYDE PRILLS(91,95) wastewater treatment method roughly is divided into two kinds according to the existence that has or not phenol in the waste water: the one, and phenolic wastewater can wait with condensation method, oxidation style, Coagulation Method and handle; The 2nd, do not contain the waste water of phenol, can use processing such as senior oxidation technology such as Fenton process, dioxide peroxide method, steam blow-off method, oxidation absorption method, electrochemical process, biological process, photocatalytic oxidation and wet oxidation processing.All there are deficiencies such as processing cost height, complicated operation and treatment effect be undesirable in above treatment process.Efficient economy to high-concentration formaldehyde wastewater is handled difficult point especially.
Summary of the invention
The present invention proposes a kind of efficient economy and handle the method for formaldehyde waste water.The ultimate principle of this method is: formaldehyde is polymerization reaction take place under calcium hydroxide or calcium oxide effect, generates formose.The formose readily biodegradable.Therefore, use method of the present invention to handle formaldehyde waste water after, continue to handle by biochemical process or other method again, can make formaldehyde waste water reach discharging or reuse requirement.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
A kind of method of handling formaldehyde waste water, used treatment agent is: calcium hydroxide or calcium oxide, the mol ratio of calcium hydroxide or calcium oxide and formaldehyde are 20: 1～1: 20.
Carry out formaldehyde waste water with described treatment agent and handle, temperature of reaction is 10～100 ℃, and the reaction times is 0.1～36 hour.Continue again after the processing to handle formaldehyde-containing wastewater, realize that formaldehyde waste water reaches discharging or reuse requirement with biochemical process or other method.
Method of the present invention is particularly suitable for handling high-concentration formaldehyde wastewater, but is not limited in the processing high-concentration formaldehyde wastewater, and is also very suitable to handling low concentration formaldehyde waste water.
The factor that influences method processing formaldehyde waste water effect of the present invention mainly contains: initial concentration of formaldehyde, temperature of reaction, calcium hydroxide or calcium oxide add-on etc.Generally, initial concentration of formaldehyde is high more, and temperature is high more, and the add-on of calcium hydroxide or calcium oxide is many more, and the formaldehyde treated effect is good more.
Beneficial effect of the present invention:
Method processing formaldehyde waste water cost of the present invention is low, effect is good, and technology is simple.
Method applied range of the present invention not only is fit to handle high-concentration formaldehyde wastewater, and is fit to handle the low concentration formaldehyde waste water.
Embodiment
The present invention further specifies the treating processes and the effect of high-concentration formaldehyde wastewater by following examples.
Embodiment 1
60 ℃ of temperature of reaction, calcium hydroxide and formaldehyde mole ratio are 1: 5, getting concentration is 11523.44mg.L
-1Formaldehyde waste water is put into container, and measured concentration of formaldehyde data of different treatment time are as follows:
| Treatment time/min | ??30 | ??45 | ??60 | ??75 | ??90 |
| Concentration of formaldehyde/mg.L -1 | ??8935.55 | ??1074.22 | ??22.09 | ??10.13 | ??7.69 |
| Clearance/% | ??22.46 | ??90.68 | ??99.81 | ??99.91 | ??99.93 |
Embodiment 2
30 ℃ of temperature of reaction, calcium hydroxide and formaldehyde mole ratio are 1: 5, getting concentration is 11523.44mg.L
-1Formaldehyde waste water is put into container, and measured concentration of formaldehyde data of different treatment time are as follows::
| Treatment time/h | ??5 | ??10 | ??16 | ??21 | ??25 |
| Concentration of formaldehyde/mg.L -1 | ??10156.25 | ??7641.60 | ??1745.61 | ??102.54 | ??10.50 |
| Clearance/% | ??11.86 | ??33.69 | ??84.85 | ??99.11 | ??99.91 |
Embodiment 3
60 ℃ of temperature of reaction, the mol ratio of regulating calcium oxide and formaldehyde, getting concentration is 11523.44mg.L
-1Formaldehyde waste water is put into container, handles after two hours, and the concentration of formaldehyde data that record are as follows:
| Calcium oxide and formaldehyde mole ratio | ??1∶2 | ??1∶3.7 | ??1∶4.3 | ??1∶5.3 | ??1∶7 |
| Concentration of formaldehyde/mg.L -1 | ??＜1 | ??5.96 | ??52.25 | ??1611.33 | ??9033.20 |
| Clearance/% | ??99.99 | ??99.95 | ??99.55 | ??86.02 | ??21.61 |
As seen from the above-described embodiment, handle high-concentration formaldehyde wastewater through method of the present invention, but the formaldehyde in the waste water of economical and efficient ground removal under certain condition.
Claims (2)
1, a kind of method of handling formaldehyde waste water is characterized in that used treatment agent is calcium hydroxide or calcium oxide, and the mol ratio of calcium hydroxide or calcium oxide and formaldehyde is 20: 1～1: 20; Temperature of reaction is 10～100 ℃; Reaction times is 0.1～36 hour; Continue again after the processing to handle formaldehyde-containing wastewater, realize that formaldehyde waste water reaches discharging or reuse requirement with biochemical process or other method.
2, the method for processing formaldehyde waste water according to claim 1 is characterized in that being particularly suitable for handling high-concentration formaldehyde wastewater, but is not limited in the processing high-concentration formaldehyde wastewater, and is also very suitable to handling low concentration formaldehyde waste water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910182029A CN101613170A (en) | 2009-07-17 | 2009-07-17 | A kind of method of handling high-concentration formaldehyde wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910182029A CN101613170A (en) | 2009-07-17 | 2009-07-17 | A kind of method of handling high-concentration formaldehyde wastewater |
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| CN101613170A true CN101613170A (en) | 2009-12-30 |
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| CN200910182029A Pending CN101613170A (en) | 2009-07-17 | 2009-07-17 | A kind of method of handling high-concentration formaldehyde wastewater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104108827A (en) * | 2014-06-27 | 2014-10-22 | 李开明 | Processing method for high concentration organic acid wastewater containing formaldehyde |
| CN104909523A (en) * | 2015-07-01 | 2015-09-16 | 百川化工(如皋)有限公司 | High-concentration formaldehyde sewage treatment system and treatment method |
| CN109336293A (en) * | 2018-11-22 | 2019-02-15 | 福州宇澄环保工程设计有限公司 | The removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) |
| CN109928582A (en) * | 2019-04-18 | 2019-06-25 | 南京清元景和环境科技有限公司 | Biological, the chemically composited processing method of formaldehyde-containing wastewater |
| CN110655275A (en) * | 2019-09-30 | 2020-01-07 | 南通百川新材料有限公司 | Treatment system and treatment method for high-COD phenol-containing sewage |
-
2009
- 2009-07-17 CN CN200910182029A patent/CN101613170A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104108827A (en) * | 2014-06-27 | 2014-10-22 | 李开明 | Processing method for high concentration organic acid wastewater containing formaldehyde |
| CN104108827B (en) * | 2014-06-27 | 2016-07-06 | 李开明 | A kind of processing method containing formaldehyde high concentration organic acidity waste water |
| CN104909523A (en) * | 2015-07-01 | 2015-09-16 | 百川化工(如皋)有限公司 | High-concentration formaldehyde sewage treatment system and treatment method |
| CN109336293A (en) * | 2018-11-22 | 2019-02-15 | 福州宇澄环保工程设计有限公司 | The removal technique of the dry tail gas spraying and dedusting displacement formaldehyde in waste water of medium density fibre board (MDF) |
| CN109928582A (en) * | 2019-04-18 | 2019-06-25 | 南京清元景和环境科技有限公司 | Biological, the chemically composited processing method of formaldehyde-containing wastewater |
| CN110655275A (en) * | 2019-09-30 | 2020-01-07 | 南通百川新材料有限公司 | Treatment system and treatment method for high-COD phenol-containing sewage |
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Open date: 20091230 |