CN116835809A - Method for treating flue gas wet desulfurization wastewater - Google Patents
Method for treating flue gas wet desulfurization wastewater Download PDFInfo
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- CN116835809A CN116835809A CN202310944093.2A CN202310944093A CN116835809A CN 116835809 A CN116835809 A CN 116835809A CN 202310944093 A CN202310944093 A CN 202310944093A CN 116835809 A CN116835809 A CN 116835809A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 32
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000003546 flue gas Substances 0.000 title claims abstract description 31
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 29
- 230000023556 desulfurization Effects 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 72
- 238000011282 treatment Methods 0.000 claims abstract description 65
- 239000007787 solid Substances 0.000 claims abstract description 29
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 26
- 230000003647 oxidation Effects 0.000 claims abstract description 24
- 239000012535 impurity Substances 0.000 claims abstract description 20
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005416 organic matter Substances 0.000 claims abstract description 10
- 238000001556 precipitation Methods 0.000 claims abstract description 10
- 239000002910 solid waste Substances 0.000 claims abstract description 9
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 6
- 238000002848 electrochemical method Methods 0.000 claims abstract description 5
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 5
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 5
- 231100000719 pollutant Toxicity 0.000 claims abstract description 5
- 230000001376 precipitating effect Effects 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 238000006386 neutralization reaction Methods 0.000 claims description 11
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 9
- 230000015556 catabolic process Effects 0.000 claims description 8
- 238000006731 degradation reaction Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000004062 sedimentation Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 238000011081 inoculation Methods 0.000 claims description 5
- 230000000813 microbial effect Effects 0.000 claims description 5
- 239000012286 potassium permanganate Substances 0.000 claims description 5
- 238000006065 biodegradation reaction Methods 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- 238000005660 chlorination reaction Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 239000002068 microbial inoculum Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000010802 sludge Substances 0.000 claims description 4
- 230000001954 sterilising effect Effects 0.000 claims description 4
- 238000004659 sterilization and disinfection Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000009210 therapy by ultrasound Methods 0.000 claims description 4
- 230000000593 degrading effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000008139 complexing agent Substances 0.000 claims description 2
- 238000005374 membrane filtration Methods 0.000 claims description 2
- 230000001699 photocatalysis Effects 0.000 claims description 2
- 238000007146 photocatalysis Methods 0.000 claims description 2
- 238000004065 wastewater treatment Methods 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000012320 chlorinating reagent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910001410 inorganic ion Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
-
- 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
-
- 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
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Microbiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biodiversity & Conservation Biology (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for treating flue gas wet desulphurization wastewater, which comprises the following steps: collecting waste water from a flue gas wet desulfurization system; separating the wastewater from wastewater residue and wastewater liquid components; carrying out solid-liquid separation on the waste water dregs to obtain solid waste dregs and water liquid; solid impurity removal treatment is carried out on the liquid component of the wastewater, and the method comprises a filtering and precipitation method; neutralizing the treated wastewater liquid component to adjust the pH value; performing oxidation treatment to remove sulfate ions in the wastewater liquid component; precipitating and filtering the oxidized wastewater liquid component to further remove suspended solids; biological treatment is carried out on the treated wastewater liquid component so as to remove organic matter pollution; finally, the treated wastewater liquid component is subjected to final treatment by adopting an electrochemical method, such as electrolysis and electroanalysis, so as to remove residual pollutants and improve the quality of the effluent.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater treatment, in particular to a method for treating flue gas wet desulfurization wastewater.
Background
Wet flue gas desulfurization is a common method for reducing the concentration of sulfur dioxide in flue gas. However, the wastewater produced by this process contains significant amounts of gas absorbents, solid bases, and other solid impurities, which are potentially harmful to the environment. Therefore, it is very necessary to effectively treat the wet flue gas desulfurization wastewater.
At present, the treatment method of the wet flue gas desulfurization wastewater mainly comprises physical treatment and chemical treatment. Physical treatments include solid-liquid separation, filtration, precipitation, etc., for removing solid impurities from wastewater. The chemical treatment mainly comprises the steps of neutralization, oxidation, biological treatment and the like, and the dissolved organic matters and inorganic ions in the wastewater are removed.
However, existing flue gas wet desulfurization wastewater treatment methods have some problems. First, the efficiency of the solid-liquid separation and solid impurity removal treatment method is limited, and the solid waste residue and solid impurities cannot be completely removed. Second, the conventional method has poor effect of removing sulfate ions in the oxidation treatment step. In addition, the adjustment of pH and the degradation efficiency of organics present challenges during neutralization and biological treatment. Therefore, it is necessary to provide an efficient and environment-friendly flue gas wet desulfurization wastewater treatment method to solve the problems of the existing method.
Disclosure of Invention
The invention provides a method for treating flue gas wet desulphurization wastewater to solve the problems.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for treating flue gas wet desulphurization wastewater comprises the following steps:
a. collecting waste water from a flue gas wet desulfurization system;
b. separating the wastewater from wastewater residue and wastewater liquid components;
c. carrying out solid-liquid separation on the waste water dregs to obtain solid waste dregs and water liquid;
d. solid impurity removal treatment is carried out on the liquid component of the wastewater, and the method comprises a filtering and precipitation method;
e. neutralizing the treated wastewater liquid component to adjust the pH value;
f. performing oxidation treatment to remove sulfate ions in the wastewater liquid component;
g. precipitating and filtering the oxidized wastewater liquid component to further remove suspended solids;
h. biological treatment is carried out on the treated wastewater liquid component so as to remove organic matter pollution;
i. finally, the treated liquid component of the wastewater is subjected to final treatment by electrochemical methods, such as electrolysis and electroanalysis, to remove residual pollutants and improve the quality of the effluent.
Further, wherein in the step of oxidizing treatment, hydrogen peroxide, ozone, potassium permanganate, or a combination thereof is used to remove sulfate ions from the liquid component of the wastewater.
Further, the neutralization treatment of the wastewater liquid component is realized by adding sodium hydroxide and calcium hydroxide alkaline substances so as to achieve the aim of neutralizing the pH value.
Further, the biological treatment of the liquid component of the wastewater is carried out by inoculating a suitable microbial agent and carrying out the biological degradation of the organic matter pollution under the proper conditions.
Further, in the step of solid-liquid separation, centrifugal filtration, press filtration, centrifugal sedimentation, or a combination thereof is used to achieve effective separation of wastewater sludge.
Further, wherein in the step of solid impurity removal treatment, a filter, a sedimentation tank, a membrane filtration or a combination thereof is used to remove solid impurities in the liquid component of the wastewater, a chemical regulator or a complexing agent is introduced to improve the removal efficiency of the solid impurities and reduce the treatment time.
Further, in the step of oxidation treatment, the addition amount and oxidation time of the oxidant are adjusted to ensure that sulfate ions in the wastewater liquid component are completely oxidized, high-efficiency mixing technology such as jet stirring and ultrasonic treatment is applied to improve the contact efficiency of the oxidant and the wastewater liquid component, so that the reaction is promoted, and advanced oxidation technology including but not limited to photocatalysis and ozone/ultraviolet desulfurization is used to improve the oxidation efficiency of sulfate ions in the wastewater liquid component and the effect of degrading organic matters.
Further, in the step of biological treatment, proper bioreactor temperature, ventilation, microbial inoculum inoculation amount and hydraulic retention time are controlled to improve the degradation efficiency of the organic matters, and the attached biological film technology or biological filter material is adopted to improve the biodegradation efficiency and the treatment capacity of the organic matters.
Further, wherein ultraviolet sterilization, chlorination, neutralization methods are used during the final treatment step to ensure that the wastewater liquid components meet the proper effluent standards.
The flue gas wet desulfurization wastewater treatment method has the following beneficial effects:
1) High-efficiency solid waste residue and solid impurities removal: through physical treatment steps such as solid-liquid separation, filtration, precipitation and the like, solid waste residues and solid impurities in the wastewater can be effectively removed, and the treatment efficiency and the water outlet quality are improved.
2) Sulfate ion is thoroughly removed: in the oxidation treatment step, hydrogen peroxide, ozone, potassium permanganate or a combination thereof is used as an oxidizing agent, so that sulfate ions in the liquid component of the wastewater can be effectively removed. The addition amount and the oxidation time of the oxidant are adjusted, and high-efficiency mixing technology such as jet stirring and ultrasonic treatment is applied, so that the oxidation reaction can be promoted, and the oxidation efficiency and the effect of degrading organic matters are improved.
3) Accurately adjusting the pH value: in the neutralization treatment step, the pH value of the liquid component of the wastewater can be accurately adjusted by adding alkaline substances such as sodium hydroxide and calcium hydroxide, so that the aim of neutralization is fulfilled, and the treated wastewater is ensured to meet the effluent standard.
4) High-efficiency removal of suspended solids: the wastewater liquid components after oxidation treatment are subjected to precipitation and filtration treatment, so that suspended solids in the wastewater liquid components can be further removed, and the clarity and purification effect of the water body are improved.
5) Biological treatment of organic matter pollution: the organic matter pollution in the liquid component of the wastewater can be effectively removed by adopting proper microbial agent inoculation and controlling proper bioreactor conditions, and the organic matter degradation efficiency is improved.
6) The final treatment improves the water quality: the final treatment of the treated liquid components of the wastewater by electrochemical methods, such as electrolysis, electroanalysis and the like, can remove residual pollutants, improve the water outlet quality and ensure that the wastewater reaches the proper water outlet standard.
In conclusion, the flue gas wet desulfurization wastewater treatment method disclosed by the invention can be used for efficiently removing solid waste residues, solid impurities, sulfate ions and organic matter pollution, so that thorough purification of wastewater and effluent quality meeting the environmental protection requirements are realized. The method has the remarkable advantages of simple operation, high treatment efficiency, good environmental protection and the like, and is suitable for the treatment of industrial flue gas wet desulphurization wastewater and the removal of pollutants such as heavy metals, organic matters and the like.
Detailed Description
The present invention will be described in further detail with reference to examples.
Specific examples:
the embodiment of the invention provides a method for treating flue gas wet desulfurization wastewater, which comprises the following steps and related detailed operations:
1. collecting wastewater from a flue gas wet desulfurization system:
and collecting the wastewater generated by the wet flue gas desulfurization system into a special wastewater collection tank by using a pipeline system.
2. Separating waste water dregs and waste water liquid components:
the mixed wastewater in the wastewater collection tank is separated by a physical separation method, such as a centrifuge, to separate the wastewater liquid components from the wastewater sludge.
3. Solid-liquid separation:
and (5) carrying out solid-liquid separation treatment on the waste water dregs. First, the wastewater sludge is transferred to a solid-liquid separation apparatus (e.g., a centrifuge or a filter press). Then, the solid waste residue is separated from the water liquid by rotary centrifugation or pressure application, the solid waste residue filter cake is collected, and the water liquid flows out.
4. Removing solid impurities:
the solid impurities in the water solution are further removed. The solid impurity removal treatment may be performed using a filter, a sedimentation tank, a membrane filter or the like. First, larger solid particulates are removed by a filter or sedimentation tank. Then, a membrane filter may be employed to further remove minute solid impurities to enhance the clarity of the wastewater.
5. Neutralization treatment of liquid components of waste water:
adding a proper amount of alkaline substances such as sodium hydroxide, calcium hydroxide and the like into the treated water solution, and adjusting the pH value of the wastewater liquid component to be neutral or in a proper range through a neutralization reaction. The pH value may be monitored and adjusted by an automatic control system.
6. And (3) oxidation treatment:
in order to remove sulfate ions in the liquid component of the wastewater, the oxidation treatment may be performed using an oxidizing agent such as hydrogen peroxide, ozone, potassium permanganate, or the like, or a combination thereof. Depending on the circumstances, the treatment may be performed with a suitable oxidant and oxidation conditions selected to ensure adequate oxidation of the sulfate ions.
7. And (3) precipitation and filtration:
the oxidized wastewater liquid component is subjected to precipitation and filtration treatment to further remove suspended solids. Precipitation may be performed using a precipitation tank and then filtered through a filter to remove residual suspended solid particles.
8. Biological treatment:
and introducing the treated wastewater liquid component into a bioreactor by using a proper microbial agent, and removing organic matter pollution through biodegradation. The temperature, ventilation volume, microbial inoculum inoculation amount and hydraulic retention time of the proper bioreactor are controlled to improve the degradation efficiency of organic matters.
9. And (3) final treatment:
finally, the treated liquid component of the wastewater is subjected to final treatment by electrochemical methods, such as electrolysis or electroanalysis, to remove residual contaminants and improve effluent quality. Ultraviolet sterilization, chlorination or neutralization and other methods can be used to ensure that the liquid components of the wastewater reach the proper water outlet standard.
10. Details of the oxidation treatment:
in the oxidation treatment step, the oxidation reaction may be performed using hydrogen peroxide, ozone, potassium permanganate, or a combination thereof, as required. The addition amount of the oxidant and the oxidation time can be adjusted to ensure that sulfate ions in the liquid components of the wastewater are completely oxidized. To increase the contact efficiency of the oxidizing agent with the liquid components of the wastewater, efficient mixing techniques such as jet stirring or ultrasonic treatment may be employed.
11. Details of biological treatment:
in the biological treatment step, a suitable microbial agent can be selected according to the organic content and properties of the wastewater. The temperature, aeration quantity, microbial inoculum inoculation quantity and hydraulic retention time of the proper bioreactor are controlled to improve the degradation efficiency of organic matters. Can adopt the technology of attaching biological film or biological filter material to increase the biodegradation efficiency and the processing capacity of organic matters.
12. Final processing details:
in the final treatment step, the treated wastewater liquid component may be subjected to ultraviolet irradiation using an ultraviolet sterilization apparatus to kill residual microorganisms. An appropriate amount of chlorinating agent may also be added to remove residual microorganisms and organics by chlorination. If desired, a neutralizing agent, such as sodium hydroxide or lime, may be used to adjust the pH of the wastewater liquid component to a suitable effluent level.
Through each step and detailed operation in the embodiment, the invention provides an integrated flue gas wet desulfurization wastewater treatment method, which can treat wastewater efficiently and reliably, reach reasonable emission standards and reduce environmental pollution.
The invention and its embodiments have been described above with no limitation, but the examples shown are only one of the embodiments of the invention, and the actual structure is not limited thereto. In summary, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical solution should not be creatively devised without departing from the gist of the present invention.
Claims (9)
1. The method for treating the wet flue gas desulfurization wastewater is characterized by comprising the following steps of:
a. collecting waste water from a flue gas wet desulfurization system;
b. separating the wastewater from wastewater residue and wastewater liquid components;
c. carrying out solid-liquid separation on the waste water dregs to obtain solid waste dregs and water liquid;
d. solid impurity removal treatment is carried out on the liquid component of the wastewater, and the method comprises a filtering and precipitation method;
e. neutralizing the treated wastewater liquid component to adjust the pH value;
f. performing oxidation treatment to remove sulfate ions in the wastewater liquid component;
g. precipitating and filtering the oxidized wastewater liquid component to further remove suspended solids;
h. biological treatment is carried out on the treated wastewater liquid component so as to remove organic matter pollution;
i. finally, the treated liquid component of the wastewater is subjected to final treatment by electrochemical methods, such as electrolysis and electroanalysis, to remove residual pollutants and improve the quality of the effluent.
2. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein hydrogen peroxide, ozone, potassium permanganate, or a combination thereof is used in the step of oxidizing treatment to remove sulfate ions from the wastewater liquid component.
3. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein the neutralization treatment of the liquid component of the wastewater is realized by adding sodium hydroxide and calcium hydroxide alkaline substances so as to achieve the aim of neutralizing the pH value.
4. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein the biological treatment of the liquid component of the wastewater is carried out by inoculating a proper microbial agent and carrying out biological degradation of organic matter pollution under proper conditions.
5. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein in the step of solid-liquid separation, centrifugal filtration, press filtration, centrifugal sedimentation, or a combination thereof is used to achieve effective separation of wastewater sludge.
6. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein in the step of solid impurity removal treatment, a filter, a sedimentation tank, a membrane filtration or a combination thereof is used to remove solid impurities in the liquid component of the wastewater, and a chemical regulator or a complexing agent is introduced to improve the removal efficiency of the solid impurities and reduce the treatment time.
7. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein in the step of oxidation treatment, the addition amount and oxidation time of the oxidant are adjusted to ensure that sulfate ions in the wastewater liquid component are completely oxidized, high-efficiency mixing technology such as jet stirring and ultrasonic treatment is applied to improve the contact efficiency of the oxidant and the wastewater liquid component, so as to promote the reaction, and advanced oxidation technology including but not limited to photocatalysis and ozone/ultraviolet ray desulfurization is used to improve the oxidation efficiency of sulfate ions in the wastewater liquid component and the effect of degrading organic matters.
8. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein in the step of biological treatment, proper bioreactor temperature, ventilation volume, microbial inoculum inoculation amount and hydraulic retention time are controlled to improve the degradation efficiency of organic matters, and an attached biological film technology or a biological filter material is adopted to improve the biodegradation efficiency and the treatment capacity of the organic matters.
9. The method for treating flue gas wet desulfurization wastewater according to claim 1, wherein: wherein ultraviolet sterilization, chlorination, neutralization methods are used during the final treatment step to ensure that the wastewater liquid components meet the proper effluent standards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310944093.2A CN116835809A (en) | 2023-07-31 | 2023-07-31 | Method for treating flue gas wet desulfurization wastewater |
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| CN202310944093.2A CN116835809A (en) | 2023-07-31 | 2023-07-31 | Method for treating flue gas wet desulfurization wastewater |
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| CN116835809A true CN116835809A (en) | 2023-10-03 |
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