CN111977872A - System and method for treating high-dust high-vanadium wastewater regenerated by denitration catalyst and recycling reclaimed water - Google Patents
System and method for treating high-dust high-vanadium wastewater regenerated by denitration catalyst and recycling reclaimed water Download PDFInfo
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- 231100000719 pollutant Toxicity 0.000 description 4
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- 230000003213 activating effect Effects 0.000 description 2
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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
- C02F9/00—Multistage 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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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
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F7/00—Aeration of stretches of water
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention provides a high-dust and high-vanadium wastewater treatment and reclaimed water recycling system for denitration catalyst regeneration, which comprises a first sludge tank, a first plate-and-frame filter press, an adjusting tank, an integrated wastewater treatment device, a recycling water tank and a wet washing tank which are connected in sequence. The invention also provides a wastewater treatment and reclaimed water recycling method using the system, which comprises the following process steps: s1, pretreating wastewater; s2, finely processing the wastewater; s3, the wastewater after the fine treatment automatically flows to a reuse water tank, and is conveyed to a wet washing tank in the denitration catalyst regeneration process through a pump and reused in the denitration catalyst regeneration process; s4, the sludge generated by the whole wastewater treatment system enters a second sludge tank, and is dehydrated after being filter-pressed by a second plate frame. The wastewater after the reaction treatment can meet the discharge requirement and the water quality requirement of the denitration catalyst regeneration wet washing process.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment, in particular to a system and a method for treating high-dust high-vanadium wastewater regenerated by a denitration catalyst and recycling reclaimed water.
Background
The implementation of the emission Standard of atmospheric pollutants for thermal power plants (GB13223-2011) puts higher requirements on the emission concentration of nitrogen oxides in coal-fired power plants, in order to achieve emission reaching the standard, a Selective Catalytic Reduction (SCR) flue gas denitration device is generally additionally arranged in the coal-fired power plants, and the SCR technology accounts for flue gas denitration projects of the coal-fired power plantsMore than 95%. As the core of SCR technology, the catalyst is mainly V2O5-TiO2System (addition of WO)3Or MoO3As an auxiliary) with a life cycle of about 3 years. When the denitration catalyst is used in a coal-fired power plant, a large amount of heavy metals such as chromium, beryllium, arsenic and mercury in flue gas can cause secondary pollution to the catalyst, so that the catalyst becomes dangerous waste rich in various heavy metal components. The SCR denitration catalyst regeneration technology can prolong the service life of the catalyst, reduce the operation cost of a power plant, reduce the treatment and disposal cost of the waste catalyst and bring the environmental pollution, so that the denitration catalyst regeneration is an inevitable requirement for the current industry development.
The denitration catalyst regeneration process unit mainly comprises the steps of initial evaluation, pretreatment, physical cleaning, chemical cleaning, active component implantation, drying, calcination and the like, and a water process is involved, so that a large amount of industrial wastewater is generated. The main pollutant generated in the physical cleaning process is cleaning wastewater containing high-concentration suspended matters, and the chemical cleaning process mainly generates wastewater containing heavy metals such as vanadium, lead, mercury, arsenic, cadmium, chromium, copper, iron, hexavalent chromium and the like and organic matters.
The key point of the wastewater treatment generated in the regeneration production process of the SCR flue gas denitration catalyst is cleaning or activating wastewater generated in the physical and chemical cleaning and active implantation processes, the cleaning or activating wastewater is collected and treated in a centralized way according to the characteristic classification of the wastewater, and heavy metal ions, ammonia nitrogen, organic matters and the like in the wastewater are treated preferentially. The method for precipitating by adding a precipitator and a flocculating agent can effectively remove heavy metal ions in the wastewater, the method for treating ammonia nitrogen in the wastewater mainly comprises a breakpoint chlorination method, an adsorption method and a biological method, and the biological method is still the most stable and effective method for treating organic matters in the wastewater at present.
In the waste water generated in the regeneration process of part of SCR flue gas denitration catalysts at present, the vanadium content is as high as 200-500 mg/L; the coal ash enters the wastewater, so that the content of suspended matters in the wastewater reaches 5000-20000mg/L, the content of suspended matters in the wastewater causes ineffective decomposition of a subsequently added oxidant, the oxidizing capability of persulfate free radicals or hydroxyl free radicals cannot be exerted, the low-valence metal ions in the wastewater are not oxidized completely, and the removal efficiency of the metal ions cannot reach the theoretical design value; at the same time, the high content of suspended matter in the wastewater also causes the dosage of the coagulant and coagulant aid to increase.
Disclosure of Invention
The invention aims to provide a system and a method for treating high-dust and high-vanadium wastewater regenerated by a denitration catalyst and recycling reclaimed water, wherein the wastewater treated by an integrated wastewater treatment device enters a recycling water tank, is conveyed to a wet washing tank in a denitration catalyst regeneration process by a pump and is recycled in the denitration catalyst regeneration process, so that the discharge requirement of the vanadium industrial pollutant discharge standard (GB26452-2011) can be met, and the water quality requirement of the denitration catalyst regeneration wet washing process can also be met.
The invention provides a denitration catalyst regeneration high-dust high-vanadium wastewater treatment and reclaimed water recycling system which comprises a first sludge tank, a first plate-and-frame filter press, an adjusting tank, an integrated wastewater treatment device, a recycling water tank and a wet washing tank which are connected in sequence.
Further, the integrated wastewater treatment equipment comprises a first-stage reaction zone, a first-stage sedimentation tank, a second-stage reaction zone and a second-stage sedimentation tank which are connected in sequence.
Further, the system comprises a second sludge tank and a second plate-and-frame filter press which are connected in sequence, wherein the second sludge tank is respectively connected with the outlets of the first-stage sedimentation tank and the second-stage sedimentation tank, and the second plate-and-frame filter press is connected with the outlet of the second sludge tank.
The invention also provides a method for treating high-dust high-vanadium wastewater and recycling reclaimed water by using the denitration catalyst regeneration system, which comprises the following process steps:
s1, pretreating the wastewater, and introducing the high-dust high-vanadium wastewater generated in the regeneration process of the denitration catalyst into integrated wastewater treatment equipment after pretreatment;
s2, performing wastewater fine treatment, and performing deep fine treatment on the wastewater in the integrated wastewater treatment equipment;
s3, the wastewater after the fine treatment automatically flows to a reuse water tank, and is conveyed to a wet washing tank in the denitration catalyst regeneration process through a pump and reused in the denitration catalyst regeneration process;
s4, the sludge generated by the whole wastewater treatment system enters a second sludge tank, and is dehydrated after being filter-pressed by a second plate frame.
Further, in the S1 step, waste water is at first through pipeline transport to first sludge impoundment, perforation aeration pipe is laid to first sludge impoundment bottom, prevent mud deposit bottom the sludge impoundment through air stirring, carry to first plate and frame filter press filter by the diaphragm pump afterwards, the play water after the filter-pressing flows to the equalizing basin certainly, perforation aeration pipe is laid to the equalizing basin bottom, carry out the regulation of quality of water yield through air stirring, the back promotes by the elevator pump and gets into integration waste water treatment equipment.
Further, step S2 is subdivided into the following processes:
s21, carrying out primary reaction on the wastewater, and enabling the wastewater to enter a primary reaction zone for reaction;
s22, primary precipitation of the wastewater, and discharging the precipitated sludge into a second sludge tank;
s23, carrying out secondary reaction on the wastewater, and enabling the wastewater separated by the primary precipitation to enter a secondary reaction area;
s24, secondary precipitation of the wastewater, and discharging the precipitated sludge into a second sludge tank.
Further, in step S21, the pH of the wastewater is first adjusted to a weakly alkaline state, and then ferrous sulfate and polyacrylamide are added to the wastewater for coagulation.
Further, in step S22, the first-stage sedimentation is performed in the first-stage sedimentation tank, the mixed liquid after the reaction is subjected to sludge-water separation, and the sludge after the sedimentation is discharged into the second sludge tank.
Further, in step S23, the wastewater is first adjusted in pH value, then added with an oxidizing agent, and then added with ferrous sulfate; and after the oxidation reaction is finished, adding liquid caustic soda to adjust the pH value back, and finally adding polyacrylamide for flocculation.
Further, in step S24, the secondary sedimentation is performed in the secondary sedimentation tank, the mixed liquid after the reaction is subjected to sludge-water separation, and the sludge after the sedimentation is discharged into the second sludge tank.
Compared with the prior art, the invention has the beneficial effects that: high-dust high-vanadium wastewater generated in the regeneration process of the denitration catalyst is firstly conveyed to a first sludge tank through a pipeline, then conveyed to a first plate-and-frame filter press through a diaphragm pump for filter pressing, and effluent after filter pressing automatically flows to an adjusting tank and sequentially passes through the integrated wastewater treatment equipment. Wherein, the sludge enters a sludge tank; waste water enters a reuse water tank, is conveyed to a wet washing tank in the denitration catalyst regeneration process through a pump, is reused in the denitration catalyst regeneration process, and can meet the emission requirement and the water quality requirement of the denitration catalyst regeneration wet washing process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a block diagram of the process of the present invention;
FIG. 2 is a schematic view of the structure of a primary reaction zone according to the present invention;
FIG. 3 is a schematic structural view of a secondary reaction zone of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present 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", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and 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 considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1 to 3, the invention provides a system for treating high-dust and high-vanadium wastewater regenerated by a denitration catalyst and recycling reclaimed water, which comprises a first sludge tank, a first plate-and-frame filter press, an adjusting tank, an integrated wastewater treatment device, a recycling water tank and a wet washing tank which are connected in sequence. The integrated wastewater treatment equipment comprises a first-stage reaction zone, a first-stage sedimentation tank, a second-stage reaction zone and a second-stage sedimentation tank which are connected in sequence. Still including the second sludge impoundment and the second plate and frame filter press of connecting in order, the second sludge impoundment respectively with the exit linkage of one-level sedimentation tank and second grade sedimentation tank, the exit linkage of second plate and frame filter press and second sludge impoundment.
Table 1:
example 2
As shown in fig. 1, the invention provides a method for treating high-dust high-vanadium wastewater and recycling reclaimed water by using a denitration catalyst of the system of the embodiment 1, which comprises the following process steps:
s1, the pretreatment of waste water, the high-dust high-vanadium waste water that produces among the denitration catalyst regeneration process at first passes through pipe-line transportation to first sludge impoundment, perforation aeration pipe is laid to first sludge impoundment bottom, prevent mud at sludge impoundment bottom deposit through air stirring, carry to first plate and frame filter press filter-pressing by the diaphragm pump afterwards, play water after the filter-pressing flows to the equalizing basin by oneself, perforation aeration pipe is laid to the equalizing basin bottom, carry out the regulation of quality of water volume through air stirring, the back promotes by the elevator pump and gets into integration waste water treatment equipment.
And S2, finely treating the wastewater, lifting the wastewater uniformly stirred and mixed by air in the step S1 to an integrated wastewater treatment device which is a steel combination device, and carrying out deep treatment in the integrated wastewater treatment device. The method comprises the following 4 steps:
s21, performing primary reaction on the wastewater, namely, adjusting the pH to 9.5-10.5, sequentially adding ferrous sulfate (the adding amount is that the concentration of the ferrous sulfate in the wastewater is controlled to be 1000mg/L) and polyacrylamide (the adding amount is that the concentration of the polyacrylamide in the wastewater is controlled to be 5mg/L), and performing coagulating sedimentation.
S22, performing primary precipitation on the wastewater, performing primary precipitation in a primary precipitation tank, performing sludge-water separation on the reacted mixed liquor, and discharging the precipitated sludge into a second sludge tank.
S23, carrying out secondary reaction on the wastewater, and enabling the wastewater separated by the primary precipitation to enter a secondary reaction area; the secondary reaction zone is divided into 5 reaction units, firstly sulfuric acid is added to adjust the pH value to 3.0-3.5, the reaction time is 45min, hydrogen peroxide is added in the second unit (the adding amount is that the concentration of the hydrogen peroxide in the wastewater is controlled to be 500-2000mg/L), ferrous sulfate is added in the third unit (the adding amount is that the concentration of the ferrous sulfate in the wastewater is controlled to be 1500-3000mg/L), and the medicament and the wastewater are ensured to be fully mixed through mechanical stirring. And after the oxidation reaction is finished, adding liquid alkali into the fourth unit to adjust the pH value back to 6.8-7.2, and finally adding Polyacrylamide (PAM) into the fifth unit for flocculation (the adding amount is that the concentration of PAM in wastewater is controlled to be 5-10mg/L), so that precipitation and separation are facilitated.
S24, secondary precipitation of the wastewater, carrying out mud-water separation on the reacted mixed liquor, and discharging the precipitated sludge into a second sludge tank.
S3, the wastewater after the fine treatment automatically flows to a reuse water tank, and is conveyed to a wet washing tank in the denitration catalyst regeneration process through a pump and reused in the denitration catalyst regeneration process;
s4, the sludge generated by the whole wastewater treatment system enters a second sludge tank, and is dehydrated after being filter-pressed by a second plate frame.
The treated wastewater reaches the discharge standard of vanadium industrial pollutants (GB 26452-2011).
The treated wastewater meets the water quality requirement of the denitration catalyst regeneration wet washing process, and is shown in table 2.
Table 2:
finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A denitration catalyst regeneration high-dust high-vanadium wastewater treatment and reclaimed water recycling system is characterized by comprising a first sludge tank, a first plate-and-frame filter press, an adjusting tank, an integrated wastewater treatment device, a reuse water tank and a wet washing tank which are connected in sequence.
2. The system for treating high-dust high-vanadium wastewater and recycling reclaimed water through regeneration of a denitration catalyst as claimed in claim 1, wherein the integrated wastewater treatment equipment comprises a primary reaction zone, a primary sedimentation tank, a secondary reaction zone and a secondary sedimentation tank which are connected in sequence.
3. The system for treating high-dust and high-vanadium wastewater and recycling reclaimed water through regeneration of a denitration catalyst as claimed in claim 2, further comprising a second sludge tank and a second plate-and-frame filter press which are connected in sequence, wherein the second sludge tank is respectively connected with the outlets of the primary sedimentation tank and the secondary sedimentation tank, and the second plate-and-frame filter press is connected with the outlet of the second sludge tank.
4. The method for treating high-dust high-vanadium wastewater and recycling reclaimed water by using the denitration catalyst regenerated by the system of any one of claims 1 to 3 is characterized by comprising the following process steps:
s1, pretreating the wastewater, and introducing the high-dust high-vanadium wastewater generated in the regeneration process of the denitration catalyst into integrated wastewater treatment equipment after pretreatment;
s2, performing wastewater fine treatment, and performing deep fine treatment on the wastewater in the integrated wastewater treatment equipment;
s3, the wastewater after the fine treatment automatically flows to a reuse water tank, and is conveyed to a wet washing tank in the denitration catalyst regeneration process through a pump and reused in the denitration catalyst regeneration process;
s4, the sludge generated by the whole wastewater treatment system enters a second sludge tank, and is dehydrated after being filter-pressed by a second plate frame.
5. The method for treating high-dust high-vanadium wastewater and recycling reclaimed water through regeneration of a denitration catalyst according to claim 4, wherein in the step S1, wastewater is firstly conveyed to the first sludge tank through a pipeline, a perforated aeration pipe is laid at the bottom of the first sludge tank, sludge is prevented from depositing at the bottom of the sludge tank through air stirring, then the wastewater is conveyed to the first plate-and-frame filter press through a diaphragm pump for filter pressing, effluent after filter pressing automatically flows to the regulating tank, the perforated aeration pipe is laid at the bottom of the regulating tank, water quality and water quantity are regulated through air stirring, and then the effluent is lifted by the lifting pump to enter the integrated wastewater treatment equipment.
6. The method for treating high-dust high-vanadium wastewater and recycling reclaimed water by regenerating the denitration catalyst as claimed in claim 5, wherein the step S2 is subdivided into the following processes:
s21, carrying out primary reaction on the wastewater, and enabling the wastewater to enter a primary reaction zone for reaction;
s22, primary precipitation of the wastewater, and discharging the precipitated sludge into a second sludge tank;
s23, carrying out secondary reaction on the wastewater, and enabling the wastewater separated by the primary precipitation to enter a secondary reaction area;
s24, secondary precipitation of the wastewater, and discharging the precipitated sludge into a second sludge tank.
7. The method for treating high-dust high-vanadium wastewater and recycling reclaimed water through regeneration of a denitration catalyst as claimed in claim 6, wherein in step S21, the pH value of the wastewater is first adjusted to be in a weakly alkaline state, and then ferrous sulfate and polyacrylamide are added for coagulation.
8. The method for treating high-dust high-vanadium wastewater and recycling reclaimed water by regenerating a denitration catalyst as claimed in claim 6, wherein in step S22, a first-stage precipitation is performed in a first-stage precipitation tank, the reacted mixed solution is subjected to sludge-water separation, and the precipitated sludge is discharged into a second sludge tank.
9. The method for treating high-dust high-vanadium wastewater and recycling reclaimed water by regenerating a denitration catalyst as claimed in claim 6, wherein in step S23, the pH value of the wastewater is firstly adjusted, then an oxidant is added, and then ferrous sulfate is added; and after the oxidation reaction is finished, adding liquid caustic soda to adjust the pH value back, and finally adding polyacrylamide for flocculation.
10. The method for treating high-dust high-vanadium wastewater and recycling reclaimed water by regenerating a denitration catalyst as claimed in claim 6, wherein in step S24, a second-stage precipitation is performed in a second-stage precipitation tank, the reacted mixed solution is subjected to sludge-water separation, and the precipitated sludge is discharged into a second sludge tank.
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