CN112624461A - Treatment method of refractory wastewater - Google Patents
Treatment method of refractory wastewater Download PDFInfo
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- CN112624461A CN112624461A CN202011627324.XA CN202011627324A CN112624461A CN 112624461 A CN112624461 A CN 112624461A CN 202011627324 A CN202011627324 A CN 202011627324A CN 112624461 A CN112624461 A CN 112624461A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 71
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- 238000007599 discharging Methods 0.000 claims abstract description 4
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/305—Treatment of water, waste water, or sewage by irradiation with electrons
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
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Abstract
The invention discloses a treatment method of refractory wastewater, which comprises the following steps: s1, performing electron beam irradiation on the wastewater to be treated; s2, performing membrane separation on the wastewater subjected to the electron beam irradiation treatment in the step S1; s3, discharging and recycling or further deeply treating membrane produced water generated after membrane separation in the step S2, and retreating membrane concentrated water; the properties of pollutants in the wastewater are changed through an electron beam irradiation process, then the pollutants with different molecular weights in the wastewater are separated through membrane treatment, and the wastewater containing the pollutants with different molecular weights respectively enters corresponding treatment sections, so that the effective treatment of the wastewater difficult to degrade is realized.
Description
Technical Field
The invention belongs to the field of environmental engineering wastewater treatment, and relates to a treatment method of refractory wastewater.
Background
Water is precious wealth which is endowed to the earth by nature, with the development of human beings, the improvement of science and technology, the increase of population, the rapid construction and development of industrial and agricultural economy and the great increase of the demand of human beings on water resources, a series of development changes lead the sewage discharge amount to be increased day by day, however, the management of human beings on an ecological system is not perfect, the water environment pollution is serious day by day, and nowadays, countries in the world face the serious water crisis of water environment pollution.
With the continuous development of the industrialization process, the discharge amount of the refractory wastewater is increased day by day, the pollutant components are also more complex, the treatment difficulty is greatly improved, the major threat to the living safety of human is formed, and the major obstacle to the sustainable development of human health, economy and society is formed; the industrial wastewater comprises production wastewater, production sewage and cooling water, and refers to wastewater and waste liquid generated in the industrial production process, wherein the wastewater and the waste liquid contain industrial production materials, intermediate products, byproducts and pollutants generated in the production process, which are lost along with water. The industrial waste water has various types and complex components, for example, the electrolytic salt industrial waste water contains mercury, the heavy metal smelting industrial waste water contains various metals such as lead, cadmium and the like, the electroplating industrial waste water contains various heavy metals such as cyanide, chromium and the like, the petroleum refining industrial waste water contains phenol, the pesticide manufacturing industrial waste water contains various pesticides and the like.
At present, the research on the treatment of the organic pollutants difficult to degrade in water is more, the adopted technology mainly comprises a physical method (adsorption, ultrafiltration and the like), a chemical method (advanced oxidation), a biochemical method (activated sludge and the like), but most methods need additional energy sources, the energy consumption is higher, the water treatment cost is high, in addition, the single technology treatment efficiency is lower, more time is usually needed to be spent, so that the industrial wastewater treatment process is slowed down, the working time of workers is increased, and great inconvenience is brought to the workers. Therefore, the method seeks an efficient combined process, realizes the removal of the pollutants difficult to degrade in water with high efficiency and low energy consumption, and is a hotspot of research in the field of water treatment.
Disclosure of Invention
The invention aims to provide a method for treating refractory wastewater, aiming at the problems in the prior art.
In order to achieve the purpose, the technical scheme is that the method for treating the refractory wastewater comprises the following steps:
s1, performing electron beam irradiation on the wastewater to be treated;
s2, performing membrane separation on the wastewater subjected to the electron beam irradiation treatment in the step S1;
s3, discharging and recycling or further deeply treating the membrane produced water generated after membrane separation in the step S2, and retreating membrane concentrated water.
More specifically, a front-end treatment section is arranged before the step S1, and the membrane concentrated water enters the front-end treatment section for circulation treatment in the step S3.
More specifically, a subsequent treatment section is arranged after the step S3, and the membrane concentrated water in the step S3 enters the subsequent treatment section for further treatment.
More specifically, in the step S1, the electron beam irradiation dose is 0.5kGy to 50 kGy.
More specifically, in the step S1, the concentration of the pollutants in the wastewater after the electron beam irradiation treatment is controlled to be 30mg/L-300 mg/L.
More specifically, in the step S2, the molecular weight cut-off of the membrane used for the membrane separation is controlled to be 100-10000 Dal.
More specifically, in the step S2, the concentration of the contaminant in the membrane produced water after the membrane separation is controlled to be lower than 30 mg/L.
More specifically, in step S3, the concentration of the contaminants in the membrane produced water after the treatment in the subsequent treatment section is controlled to be lower than 15 mg/L.
The invention relates to a treatment method of refractory wastewater, which can realize the following technical effects:
the properties of pollutants in the wastewater are changed through an electron beam irradiation process, then the pollutants with different molecular weights in the wastewater are separated through membrane treatment, and the wastewater containing the pollutants with different molecular weights respectively enters corresponding treatment sections, so that the effective treatment of the wastewater difficult to degrade is realized.
Drawings
FIG. 1 is a schematic flow chart of the operation of the present invention.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below by referring to the drawings are a part of the embodiments of the present invention, not all of them. The embodiments described below with reference to the drawings are exemplary and are intended to be used for explaining the present invention. And are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention. The following provides a detailed description of embodiments of the invention.
In order to solve the technical problem, the invention is realized by the following technical scheme as shown in fig. 1:
a treatment method of refractory wastewater comprises the following steps:
s1, performing electron beam irradiation on the wastewater to be treated;
s2, performing membrane separation on the wastewater subjected to the electron beam irradiation treatment in the step S1;
s3, discharging, recycling or deeply treating the membrane produced water generated after membrane separation in the step S2, and retreating the membrane concentrated water.
The method comprises the steps of carrying out a series of biochemical or physicochemical treatments on the degradation-resistant wastewater, and adding no or a series of synergistic reagents including but not limited to catalysts, flocculating agents, oxidizing agents, transition metals and compounds thereof and ozone into the wastewater to be treated.
The degradation-resistant wastewater to be treated flows through the irradiation reactor to change the wastewater into uniform and stable waterFlowing, irradiating with electron accelerator to generate hydroxyl radical (-OH) and hydrogen peroxide (H) under the action of electron beam irradiation2O2) The equal-strength oxidation particles can generate almost equal-quantity of water and strong reduction particles such as electron (eaq-) and hydrogen atom (H-) at the same time, and the free radicals and active particles with high reaction activity can react with organic substances which are difficult to degrade, mineralize the organic substances or destroy the structure of the organic substances, improve the biochemical property or the sedimentation property and change the property of pollutants;
after the refractory wastewater is subjected to electron beam irradiation treatment, organic matters in the wastewater subjected to electron beam irradiation respectively undergo crosslinking and cracking reactions, part of organic matter micromolecules are crosslinked into macromolecular substances, part of macromolecular substances are cracked into micromolecular substances, but both the crosslinking and cracking reactions have contingency, membrane separation is subsequently carried out, wastewater with different organic matter contents can be efficiently separated, the wastewater enters different treatment sections according to different organic matter molecular weights, membrane produced water and membrane concentrated water are generated after the membrane separation, the membrane produced water is wastewater with less organic matter content in molecules generated after the membrane separation process is filtered, the membrane concentrated water is wastewater with more organic matter content in molecules intercepted after the membrane separation process is filtered, the membrane produced water is discharged, recycled or deeply treated, and the membrane concentrated water flows back to a front-end treatment section or is additionally provided with a subsequent treatment section, and entering a subsequent treatment working section for further treatment.
In this scheme, there are two embodiments of the membrane concentrate produced after the membrane separation, and the specific embodiments are as follows:
example 1
A front-end treatment working section is arranged before the step S1, the membrane concentrated water in the step S3 enters a front-end treatment working section to be treated again, namely, the wastewater to be treated is subjected to the electron beam irradiation treatment and then the membrane separation treatment, the membrane treatment generates the membrane produced water and the membrane concentrated water, the membrane produced water is subjected to subsequent discharge, reuse or advanced treatment, the membrane concentrated water enters the front-end treatment working section to be treated, the electron beam irradiation and the membrane separation treatment are carried out again after the treatment, and the like, until all the membrane concentrated water meets the requirements;
example 2
And (4) arranging an enhanced treatment unit after the step S3, enabling the membrane concentrated water in the step S3 to enter the enhanced treatment unit for further treatment, namely performing electron beam irradiation treatment on the wastewater to be treated, performing membrane separation treatment, performing subsequent discharge, recycling or advanced treatment on membrane produced water generated after the membrane separation treatment, and enabling the membrane concentrated water to enter a subsequent treatment working section for further treatment.
The front-end treatment working section and the subsequent treatment working section are selected to be arranged alternatively, the membrane concentrated water is reprocessed, and the membrane concentrated water is automatically selected to enter the front-end treatment working section arranged before the electron beam irradiation for reprocessing or enter the strengthening treatment unit arranged after the membrane separation for treatment according to the requirement; the membrane concentrated water generated in the membrane separation technology has high concentration of organic matters, higher mineralizers, poor biodegradability and great potential hazard to the environment, and if the membrane concentrated water is directly discharged, soil, surface water, ocean and the like may be polluted, so that further treatment is needed, the membrane produced water is subjected to subsequent discharge, reuse or advanced treatment, and the advanced treatment is arranged behind the membrane separation treatment; the membrane concentrated water needs to flow back to a front-end treatment working section or a subsequent treatment working section for retreatment, and one of the front-end treatment working section and the subsequent treatment working section is selected and selected according to the requirement; the maximum treatment effect is achieved, the efficiency is maximized, and the utilization rate of the wastewater is improved.
In the step S1, the electron beam irradiation dose is 0.5kGy to 50kGy, and the specific irradiation dose is determined according to the amount of sewage to be treated.
In step S1, the electron beam irradiation process is performed in the air, and the electron accelerator performs irradiation treatment on the sludge in the irradiation tank downward in a direction perpendicular to the horizontal plane.
In the step S1, the concentration of pollutants in the wastewater after the electron beam irradiation treatment is controlled to be 30mg/L-300mg/L, which can be calculated by total organic carbon in the scheme.
In the step S2, membrane separation is performed on the wastewater after the electron beam irradiation is completed, the cut-off molecular weight of the membrane used for membrane separation is controlled to be 100-10000Dal, and the water yield is 70-90%. In the step S2, the concentration of the contaminant in the membrane produced water after the membrane separation is controlled to be lower than 30mg/L, which can be calculated by the total organic carbon in the present scheme.
In the step S3, the membrane produced water generated by the membrane separation is discharged, recycled or further processed, and the concentration of the pollutant in the final membrane produced water is controlled to be lower than 15mg/L, which can be calculated by the total organic carbon in the scheme.
The following are three different embodiments of the present solution:
example 1
Treatment of pharmaceutical waste water by electron beam irradiation-membrane separation device
Putting the pharmaceutical wastewater to be treated into a tray, carrying out irradiation treatment on the pharmaceutical wastewater in the air, wherein the total organic carbon content of the pharmaceutical wastewater subjected to electron beam irradiation treatment is about 30-100 mg/L, and carrying out membrane separation treatment after electron beam irradiation, in the embodiment, the intercepted molecular weight of a membrane is selected to be 100-10000Dal, the water yield is 70-90%, the total organic carbon content in membrane produced water generated after membrane separation treatment is about less than 20mg/L, and after the pharmaceutical wastewater is separated into membrane produced water and membrane concentrated water, the membrane produced water is immediately subjected to subsequent discharge, reuse or further deepened treatment; the membrane concentrated water flows back to the front end biochemical treatment working section or enters the subsequent treatment working section, after the membrane concentrated water is treated again, the total organic carbon content in the finally obtained effluent is reduced to below 15mg/L, the chemical oxygen demand is below 50mg/L, the effective treatment is further obtained, the efficiency is maximized, and the pollution to the environment and the water quality is reduced.
TABLE 1
Example 2
Treatment of printing and dyeing waste water by electron beam irradiation-membrane separation device
Printing and dyeing wastewater needing electron beam irradiation is made into uniform and stable fluid through a rectification system such as an under-beam device, the printing and dyeing wastewater is subjected to irradiation treatment in the air, the total organic carbon content in the printing and dyeing wastewater subjected to the electron beam irradiation treatment is about 30mg/L-200mg/L, membrane separation treatment is carried out after the electron beam irradiation treatment is finished, in the embodiment, the intercepted molecular weight of a membrane is selected to be 100Dal-10000Dal, the water yield is 70% -90%, the total organic carbon content in membrane produced water generated after the membrane separation treatment is reduced to be below 20mg/L, membrane produced water and membrane concentrated water are generated in the membrane separation operation process, and the membrane produced water is subjected to subsequent discharge, recycling or further deepening treatment; and the membrane concentrated water flows back to the front-end treatment working section or the subsequent treatment working section for secondary treatment, after the secondary treatment, the content of total organic carbon in the finally obtained effluent is reduced to below 15mg/L, and the chemical oxygen demand is reduced to below 50mg/L, so that the efficiency is maximized, and the pollution to the environment and the water quality is further reduced.
TABLE 2
Example 3
Chemical wastewater treatment by electron beam irradiation-membrane separation device
Chemical wastewater to be treated passes through a rectification system such as an under-beam device to be made into uniform and stable fluid, the chemical wastewater is irradiated in the air, the total organic carbon content of the chemical wastewater subjected to electron beam irradiation treatment is about 30mg/L-100mg/L, membrane separation treatment is carried out after the electron beam irradiation, in the embodiment, the molecular weight cut-off of a membrane is selected to be 100Dal-10000Dal, the water production rate is 70% -90%, the total organic carbon content of membrane produced water generated after the membrane separation treatment is about less than 20mg/L, and after the chemical wastewater is separated into membrane produced water and membrane concentrated water, the membrane produced water is subsequently discharged, recycled or further deepened; the membrane concentrated water flows back to the front end biochemical treatment working section or enters the subsequent treatment working section, after the membrane concentrated water is treated again, the total organic carbon content in the finally obtained effluent is reduced to below 15mg/L, the chemical oxygen demand is below 50mg/L, the effective treatment is further obtained, the efficiency is maximized, and the pollution to the environment and the water quality is reduced.
TABLE 3
The invention relates to a treatment method of refractory wastewater, which adopts a method combining electron beam irradiation and membrane separation technology to improve the treatment efficiency of wastewater, changes the properties of pollutants in the wastewater through the electron beam irradiation technology, separates the pollutants with different molecular weights in the wastewater through membrane treatment, and respectively treats the wastewater containing the pollutants with different molecular weights in corresponding treatment sections, thereby realizing the effective treatment of the refractory wastewater.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A treatment method of refractory wastewater is characterized in that: the method comprises the following steps:
s1, performing electron beam irradiation on the wastewater to be treated;
s2, performing membrane separation on the wastewater subjected to the electron beam irradiation treatment in the step S1;
s3, discharging and recycling or further deeply treating the membrane produced water generated after membrane separation in the step S2, and retreating membrane concentrated water.
2. The method for treating refractory wastewater according to claim 1, wherein: a front end treatment section is arranged before the step S1, and the membrane concentrated water enters the front end treatment section for circulation treatment in the step S3.
3. The method for treating refractory wastewater according to claim 1, wherein: and a subsequent treatment section is arranged after the step S3, and the membrane concentrated water in the step S3 enters the subsequent treatment section for further treatment.
4. The method for treating refractory wastewater according to claim 1, wherein: in the step S1, the electron beam irradiation dose is 0.5kGy to 50 kGy.
5. The method for treating refractory wastewater according to claim 1, wherein: in the step S1, the concentration of pollutants in the wastewater after the electron beam irradiation treatment is controlled to be 30mg/L-300 mg/L.
6. The method for treating refractory wastewater according to claim 1, wherein: in the step S2, the cut-off molecular weight of the membrane used for the membrane separation is controlled to be 100-10000 Dal.
7. The method for treating refractory wastewater according to claim 1, wherein: in the step S2, the pollutant concentration in the membrane produced water after the membrane separation is controlled to be lower than 30 mg/L.
8. The method for treating refractory wastewater according to claim 7, wherein: in the step S3, the concentration of the pollutants in the membrane produced water after the treatment of the subsequent treatment section is controlled to be lower than 15 mg/L.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113480060A (en) * | 2021-06-10 | 2021-10-08 | 广州绿邦环境技术有限公司 | Method and equipment for treating refractory industrial wastewater by electron beam irradiation |
| CN114057251A (en) * | 2021-11-01 | 2022-02-18 | 中广核达胜科技有限公司 | Treatment method of gas field wastewater |
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