CN114275950B - Method for efficiently degrading refined cotton black liquor - Google Patents
Method for efficiently degrading refined cotton black liquor Download PDFInfo
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- CN114275950B CN114275950B CN202111414071.2A CN202111414071A CN114275950B CN 114275950 B CN114275950 B CN 114275950B CN 202111414071 A CN202111414071 A CN 202111414071A CN 114275950 B CN114275950 B CN 114275950B
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Abstract
The application relates to a method for efficiently degrading refined cotton black liquor, which comprises the following steps: 1) Adding persulfate or peroxymonosulfate into the refined cotton black liquor with certain waste heat according to a certain proportion; 2) Changing the pH value of the obtained mixture, and fully stirring at a certain temperature; 3) Standing the mixture for 2-4h to precipitate impurities in the wastewater, and then filtering the standing wastewater to remove turbid layers and solid suspended matters in the wastewater; 4) The wastewater treated by the steps is irradiated at an ultraviolet light source; 5) And (3) introducing the degraded wastewater into a reverse osmosis device, and further removing impurities in the wastewater through reverse osmosis filtration to reach the national secondary discharge standard of municipal wastewater. The method for degrading the purified cotton wastewater can effectively utilize waste heat, reduce energy consumption, save cost, and has COD removal rate of more than 90 percent and chromaticity removal rate of more than 90 percent.
Description
Technical Field
The application relates to the technical field of water treatment, in particular to a high-efficiency degradation method of refined cotton black liquor.
Background
The purified cotton black liquor belongs to a class of special organic polluted sewage which is difficult to treat, and has the characteristics of high chroma (7000-8000 times at most), high COD (3X 104 mg/L-5X 104 mg/L), strong alkalinity (pH > 12), poor biodegradability (BOD/COD is generally less than 0.25), and the like. The purified cotton black liquor is discharged into the water body without treatment or without reaching the standard, and serious environmental pollution is caused.
At present, the black liquor of refined cotton is generally pretreated and then mixed with sewage from other refined cotton production to be treated uniformly. The pretreatment methods mainly comprise oxidation, acid precipitation, electrochemistry and pretreatment based on microorganisms. Advanced oxidation technology has good treatment effect on sewage which contains high organic pollutants and is difficult to biodegrade, however other physical and mechanical methods such as flocculation, precipitation, activated carbon, filtration and the like are separating and concentrating toxic compounds, and secondary pollutants can be generated. The acid precipitation technology is a conventional and necessary pretreatment method, and is simple to operate and low in cost, but the acid precipitation technology has a low treatment effect and can only remove a small part of COD in the wastewater. The microbial acidification technology can adjust the pH value of sewage, has certain limitations for biochemical treatment and physical and chemical treatment of high-pH sewage, and is difficult to obtain good treatment effect. The purified cotton black liquor is one of the main sources of wastewater pollution, and is subjected to high-efficiency degradation and then discharged by a proper method, so that the method has great significance.
Disclosure of Invention
The application aims to solve the technical problems in the prior art and provides a method for efficiently degrading the black liquor of refined cotton, which has the advantages of simple process, high efficiency, low energy consumption and easy realization of industrialization.
In order to solve the technical problems, the technical scheme provided by the application is as follows:
a method for efficiently degrading refined cotton black liquor comprises the following steps:
1) Adding persulfate or peroxymonosulfate into the refined cotton black liquor with certain waste heat according to a certain proportion;
2) Adding NaOH solution into the obtained mixture to change the pH value of the obtained mixture, and fully stirring at a certain temperature;
3) Standing the obtained mixture for 2-4h to precipitate impurities in the wastewater, and filtering the standing wastewater to remove turbid layers and solid suspended matters in the wastewater;
4) The obtained wastewater is illuminated at an ultraviolet light source;
5) The degraded wastewater is introduced into a reverse osmosis device, and impurities in the wastewater are further removed through reverse osmosis filtration.
According to the scheme, the persulfate or the peroxymonosulfate in the step 1) is ammonium persulfate, sodium persulfate or potassium persulfate.
According to the scheme, the certain waste heat in the step 1) is more than 70 ℃.
According to the above scheme, the addition ratio of the solution in step 1) is 0.5-3mM.
According to the scheme, the pH value range is changed to 10-12 by adding NaOH in the step 2), and the temperature is 60-80 ℃.
According to the scheme, the intensity of the ultraviolet light source in the step 3) is 5-10mW/cm < 2 >, and the illumination time is 3-5h.
The application has the beneficial effects that: (1) The method uses the refined cotton black liquor with waste heat as a treatment object, is easy to realize industrial production, improves degradation rate and reduces energy consumption. (2) According to the strong oxidizing property of persulfate, a large amount of organic matters in the wastewater are oxidized and decomposed by heating and ultraviolet irradiation treatment, so that the defect that a flocculant is difficult to adsorb small molecular matters and the adsorbent is incompletely adsorbed is overcome, and organic matters in the wastewater are effectively solved. (3) Reverse osmosis membranes are commonly used for sea water desalination, boiler wastewater treatment and the like, and the pretreated purified cotton wastewater is subjected to reverse osmosis treatment, so that the wastewater is effectively treated, and the national urban wastewater secondary discharge standard is achieved.
Detailed Description
The application is described in further detail in order to enable those skilled in the art to better understand the technical scheme of the application.
Example 1
Taking refined cotton black liquor as an example, the content of organic matters in waste water is 2000mg/L, and the chromaticity is about 1500 times. The specific operation process is as follows:
1) Ammonium persulfate is added into the refined cotton black liquor with 70 ℃ waste heat according to the proportion of 0.5 mmol/L;
2) Adding NaOH solution into the obtained mixture to change the pH value of the obtained mixture to 9, and fully stirring at 90 ℃;
3) Standing the obtained mixture for 3h to precipitate impurities in the wastewater, and filtering the standing wastewater to remove turbid layers and solid suspended matters in the wastewater;
4) The intensity of the obtained wastewater in the ultraviolet light source is 5mW/cm 2 Illuminating the sufficient place for 4 hours;
5) The degraded wastewater is introduced into a reverse osmosis device, and impurities in the wastewater are further removed through reverse osmosis filtration.
The treated black liquor is detected, the COD removal rate is 95%, and the chromaticity is reduced by 97%.
Example 2
Taking refined cotton black liquor as an example, the organic matter content of the wastewater is 3000mg/L, and the chromaticity is about 1000 times. The specific operation process is as follows:
1) Ammonium persulfate is added into the refined cotton black liquor with 70 ℃ waste heat according to the proportion of 1 mmol/L;
2) Adding NaOH solution into the obtained mixture to change the pH value of the obtained mixture to 10, and fully stirring at 80 ℃;
3) Standing the obtained mixture for 4 hours to precipitate impurities in the wastewater, and filtering the standing wastewater to remove turbid layers and solid suspended matters in the wastewater;
4) The intensity of the obtained wastewater in an ultraviolet light source is 8mW/cm 2 Illuminating the sufficient place for 5 hours;
5) The degraded wastewater is introduced into a reverse osmosis device, and impurities in the wastewater are further removed through reverse osmosis filtration.
The treated black liquor is detected, the COD removal rate is 93%, and the chromaticity is reduced by 94%.
Example 3
Taking refined cotton black liquor as an example, the content of organic matters in waste water is 1500mg/L, and the chromaticity is about 1200 times. The specific operation process is as follows:
1) Ammonium persulfate is added into the refined cotton black liquor with 75 ℃ waste heat according to the proportion of 0.8 mmol/L;
2) Adding NaOH solution into the obtained mixture to change the pH value of the obtained mixture to 11, and fully stirring at 85 ℃;
3) Standing the obtained mixture for 4 hours to precipitate impurities in the wastewater, and filtering the standing wastewater to remove turbid layers and solid suspended matters in the wastewater;
4) The intensity of the obtained wastewater in an ultraviolet light source is 10mW/cm 2 Illuminating the sufficient place for 4 hours;
5) The degraded wastewater is introduced into a reverse osmosis device, and impurities in the wastewater are further removed through reverse osmosis filtration.
The treated black liquor is detected, the COD removal rate is 95%, and the chromaticity is reduced by 94%.
Claims (1)
1. A method for efficiently degrading refined cotton black liquor is characterized by comprising the following steps:
1) Ammonium persulfate is added into the refined cotton black liquor with 70 ℃ waste heat according to the proportion of 0.5 mmol/L;
2) Adding NaOH solution into the obtained mixture to change the pH value of the obtained mixture to 9, and fully stirring at 90 ℃;
3) Standing the obtained mixture for 3h to precipitate impurities in the wastewater, and filtering the standing wastewater to remove turbid layers and solid suspended matters in the wastewater;
4) The intensity of the obtained wastewater in the ultraviolet light source is 5mW/cm 2 Illuminating the sufficient place for 4 hours;
5) Introducing the degraded wastewater into a reverse osmosis device, and further removing impurities in the wastewater through reverse osmosis filtration;
the organic matter content of the refined cotton black liquor is 2000mg/L, and the chromaticity is 1500 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111414071.2A CN114275950B (en) | 2021-11-25 | 2021-11-25 | Method for efficiently degrading refined cotton black liquor |
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| CN202111414071.2A CN114275950B (en) | 2021-11-25 | 2021-11-25 | Method for efficiently degrading refined cotton black liquor |
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| CN114275950A CN114275950A (en) | 2022-04-05 |
| CN114275950B true CN114275950B (en) | 2023-10-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105502775A (en) * | 2016-01-21 | 2016-04-20 | 中华人民共和国济南出入境检验检疫局 | Antibiotic wastewater degradation process |
| CN107285565A (en) * | 2017-07-17 | 2017-10-24 | 同济大学 | Persulfate pretreatment vibration membrane reactor removes film concentrated water organic matter technique |
| CN110240253A (en) * | 2019-07-23 | 2019-09-17 | 大连民族大学 | A method of utilizing remaining alkali Heat Treatment purified cotton black liquor |
| CN111533210A (en) * | 2020-04-29 | 2020-08-14 | 南京中微纳米功能材料研究院有限公司 | Method for treating dye wastewater by using UV (ultraviolet) to heat and activate persulfate |
| CN113121048A (en) * | 2019-12-30 | 2021-07-16 | 湖北金汉江精制棉有限公司 | Refined cotton wastewater treatment and recycling process |
-
2021
- 2021-11-25 CN CN202111414071.2A patent/CN114275950B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105502775A (en) * | 2016-01-21 | 2016-04-20 | 中华人民共和国济南出入境检验检疫局 | Antibiotic wastewater degradation process |
| CN107285565A (en) * | 2017-07-17 | 2017-10-24 | 同济大学 | Persulfate pretreatment vibration membrane reactor removes film concentrated water organic matter technique |
| CN110240253A (en) * | 2019-07-23 | 2019-09-17 | 大连民族大学 | A method of utilizing remaining alkali Heat Treatment purified cotton black liquor |
| CN113121048A (en) * | 2019-12-30 | 2021-07-16 | 湖北金汉江精制棉有限公司 | Refined cotton wastewater treatment and recycling process |
| CN111533210A (en) * | 2020-04-29 | 2020-08-14 | 南京中微纳米功能材料研究院有限公司 | Method for treating dye wastewater by using UV (ultraviolet) to heat and activate persulfate |
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