CN111995151A - Multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater - Google Patents

Multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater Download PDF

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CN111995151A
CN111995151A CN202010841811.XA CN202010841811A CN111995151A CN 111995151 A CN111995151 A CN 111995151A CN 202010841811 A CN202010841811 A CN 202010841811A CN 111995151 A CN111995151 A CN 111995151A
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desulfurization wastewater
treatment
wastewater
corrosion
diluent
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孟德斌
邓文亮
凡晓峰
张正坦
张明祥
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Anhui Jinlong Machinery Co ltd
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Anhui Jinlong Machinery Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048Purification of waste water by evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/586Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62Heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/16Nitrogen compounds, e.g. ammonia
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • C02F2101/203Iron or iron compound
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/20Heavy metals or heavy metal compounds
    • C02F2101/22Chromium or chromium compounds, e.g. chromates
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents

Abstract

The invention discloses a multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater in the technical field of sewage treatment, which comprises the following steps: the method comprises the following steps: water sample pretreatment: collecting the desulfurization wastewater, and pretreating suspended matters, supersaturated sulfite, sulfate and heavy metals contained in the desulfurization wastewater; step two: selecting a medicament: the method selects 40-60% of ammonia nitrogen remover and 40-56% of COD remover, and the anti-scaling and anti-corrosion desulfurization wastewater is comprehensively treated by multi-effect evaporation concentration crystallization, so that suspended matters are gradually precipitated in the treatment process of the desulfurization wastewater, and the treatment modes of adding multiple agents and fusing agents are matched with each other, thereby effectively reducing the defects of scaling and corrosion in the desulfurization wastewater treatment.

Description

Multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater
Technical Field
The invention discloses a multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater, and particularly relates to the technical field of sewage treatment.
Background
Sewage treatment is a process of purifying sewage to meet the water quality requirement of discharging the sewage into a certain water body or reusing the sewage, and is widely applied to various fields of buildings, agriculture, traffic, energy, petrifaction, environmental protection, urban landscape, medical treatment, catering and the like.
And the wastewater containing desulfurization wastewater is mainly from a gypsum dehydration and cleaning system, in order to maintain the balance of the materials of a slurry circulating system of a desulfurization device, prevent the concentration of soluble part, namely chlorine in flue gas from exceeding a specified value and ensure the quality of gypsum, and a certain amount of wastewater must be discharged from the system. The impurities contained in the wastewater mainly comprise suspended matters, supersaturated sulfite, sulfate and heavy metals, wherein a lot of pollutants are the first pollutants which are required to be strictly controlled in the national environmental protection standard, the desulfurization wastewater is mainly the wet desulfurization of the boiler flue gas and the discharge water of an absorption tower in the limestone/gypsum method process, and the desulfurization wastewater is mainly the discharge water of the absorption tower in the wet desulfurization of the boiler flue gas (limestone/gypsum method).
At present, in the processing procedure of current desulfurization waste water, only equipped with conventional medicament, and in conventional medicament fusion processing procedure, the scale deposit that leads to in the unable effectual reduction desulfurization waste water treatment and the problem of equipment corrosion make equipment treatment effect variation, the life-span reduces, has produced negative effects to desulfurization waste water's cyclic stability, lacks the processing testing process of substep simultaneously, has also influenced actual treatment's effect.
Disclosure of Invention
The invention aims to provide a multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of scale and corrosion prevention desulfurization wastewater, and aims to solve the problems that only conventional reagents are prepared in the conventional desulfurization wastewater treatment process proposed in the background art, and scaling and equipment corrosion caused in desulfurization wastewater treatment cannot be effectively reduced in the conventional reagent fusion treatment process, so that the equipment treatment effect is poor, the service life is shortened, negative effects are generated on the circulation stability of desulfurization wastewater, and the actual treatment effect is influenced due to the lack of a step-by-step treatment detection process.
In order to achieve the purpose, the invention provides the following technical scheme: a multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater comprises the following steps:
the method comprises the following steps: water sample pretreatment: collecting the desulfurization wastewater, and pretreating suspended matters, supersaturated sulfite, sulfate and heavy metals contained in the desulfurization wastewater;
step two: selecting a medicament:
selecting 40-60% ammonia nitrogen remover and 40-56% COD remover to prepare diluent of 25mg/ml, wherein the diluent needs to ensure that the diluent is stored in a sealing structure;
adding 35-50% of heavy metal settling agent and heavy metal precipitate Ca (OH) 2 to improve the pH value of the wastewater so that heavy metal ions such as Fe3+, Zn2+, Cu2+, Ni2+, Cr3+ and the like generate hydroxide precipitate;
selecting 15-30% of scale inhibitor to prepare a spare liquid of 55 mg/ml;
step three: adding a medicament: adding a diluent, a heavy metal settling agent and a standby liquid into a treatment device according to the milliliter number of the medicament diluent corresponding to different adding concentrations;
the inner wall of the treatment device is made of carbon-plastic alloy, a heating circulating pipe fitting is arranged in an interlayer of the inner wall of the treatment device, the output end of the treatment device is connected with a concentrator, and the output end of the concentrator is connected with a crystallizer;
step four: and (3) medicament fusion:
s1, stirring the desulfurized wastewater for 25-35 min by using a magnetic stirring structure after the desulfurized wastewater is internally filled, standing for 3-15 min, wherein a treatment device consists of three separation grooves, each separation groove automatically flows into the next separation groove after being filled, lime slurry is added while the desulfurized wastewater enters the first separation groove, and stirring is carried out to keep the pH value at 7-9;
s2, adding organic sulfide into the second separation groove to react with Pb2+ and Hg2+ to form insoluble sulfide for deposition;
s3: adding a flocculating agent into the third separation tank, and adding cationic polymer polyelectrolyte serving as a coagulant aid into the outlet of the treatment device to reduce the surface tension of the particles, strengthen the growth process of the particles and further promote the precipitation of hydroxide and sulfide;
s4: the impurities which are not scaled are discharged into the mortar tank through a sludge pump, the purified water at the upper part flows to a purified water tank through an overflow port at the periphery of the clarification/concentration tank, the purified water tank is provided with an online monitoring instrument for monitoring the pH value and suspended matters of the purified water, and the purified water is transmitted to the concentrator after being qualified;
step five: and (3) subsequent treatment: the concentrator is used for concentration treatment, and the crystallizer is matched for crystallization treatment, and a pump body structure is applied in the transmission process of the treatment;
step six: and (3) detection: the steps of evaporating, concentrating and crystallizing the treated wastewater all need to be subjected to liquid detection so as to perfect the adding conditions of a diluent, a heavy metal settling agent and a standby liquid.
Preferably, the adding amount of the heavy metal settling agent is 20-25% of the total amount of the desulfurization wastewater.
Preferably, the adding amount of the scale inhibitor is 10-20% of the total amount of the desulfurization wastewater.
Preferably, the connection ends of the treatment device, the concentrator and the crystallizer are all sleeved with sealing structures.
Compared with the prior art, the invention has the beneficial effects that: according to the multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater, suspended matters are gradually precipitated in the treatment process of desulfurization wastewater, the treatment modes of adding multiple agents and fusing agents are matched with each other, the scaling and corrosion defects in desulfurization wastewater treatment are effectively reduced, the treatment modes in steps are matched, and sectional detection is carried out, so that the purpose of comprehensive treatment is achieved, and the method has a strong treatment effect and strong circulation stability.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The invention provides a technical scheme that: a multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater comprises the following steps:
a multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater comprises the following steps:
the method comprises the following steps: water sample pretreatment: collecting the desulfurization wastewater, and pretreating suspended matters, supersaturated sulfite, sulfate and heavy metals contained in the desulfurization wastewater;
step two: selecting a medicament:
selecting 40-60% ammonia nitrogen remover and 40-56% COD remover to prepare diluent of 25mg/ml, wherein the diluent needs to ensure that the diluent is stored in a sealing structure;
adding 35-50% of heavy metal settling agent and heavy metal precipitate Ca (OH) 2 to improve the pH value of the wastewater so that heavy metal ions such as Fe3+, Zn2+, Cu2+, Ni2+, Cr3+ and the like generate hydroxide precipitate;
selecting 15-30% of scale inhibitor to prepare a spare liquid of 55 mg/ml;
step three: adding a medicament: adding a diluent, a heavy metal settling agent and a standby liquid into a treatment device according to the milliliter number of the medicament diluent corresponding to different adding concentrations;
the inner wall of the treatment device is made of carbon-plastic alloy, a heating circulating pipe fitting is arranged in an interlayer of the inner wall of the treatment device, the output end of the treatment device is connected with a concentrator, and the output end of the concentrator is connected with a crystallizer;
step four: and (3) medicament fusion:
s1, stirring the desulfurized wastewater for 25-35 min by using a magnetic stirring structure after the desulfurized wastewater is internally filled, standing for 3-15 min, wherein a treatment device consists of three separation tanks, each separation tank automatically flows into the next separation tank after being filled, lime slurry is added while the desulfurized wastewater enters the first separation tank, and stirring is carried out to keep the pH value at 7-9;
s2, adding organic sulfide into the second separation tank, and reacting the organic sulfide with Pb2+ and Hg2+ to form insoluble sulfide for deposition;
s3: adding a flocculating agent into the third separation tank, and adding cationic polymer polyelectrolyte as a coagulant aid at the outlet of the treatment device to reduce the surface tension of the particles, strengthen the growth process of the particles and further promote the precipitation of hydroxide and sulfide;
s4: the impurities which are not scaled are discharged into an ash slurry tank through a sludge pump, the purified water at the upper part flows to a purified water tank through an overflow port at the periphery of the clarification/concentration tank, the purified water tank is provided with an online monitoring instrument for monitoring the pH value and suspended matters of the purified water, and the purified water is transmitted to a concentrator after being qualified;
step five: and (3) subsequent treatment: a concentrator is used for concentration treatment, and a crystallizer is matched for crystallization treatment, wherein a pump body structure is applied in the transmission process of the treatment;
step six: and (3) detection: the steps of evaporating, concentrating and crystallizing the treated wastewater all need to be subjected to liquid detection so as to perfect the adding conditions of a diluent, a heavy metal settling agent and a standby liquid.
Wherein the adding amount of the heavy metal settling agent is 20-25% of the total amount of the desulfurization wastewater, the adding amount of the scale inhibitor is 10-20% of the total amount of the desulfurization wastewater, and the connecting ends of the treatment device, the concentrator and the crystallizer are all sleeved with sealing structures.
Example 1
A multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater comprises the following steps:
the method comprises the following steps: water sample pretreatment: collecting the desulfurization wastewater, and pretreating suspended matters, supersaturated sulfite, sulfate and heavy metals contained in the desulfurization wastewater;
step two: selecting a medicament:
selecting 60% ammonia nitrogen remover and 56% COD remover to prepare diluent of 25mg/ml, wherein the diluent needs to ensure that the diluent is stored in a sealing structure;
selecting 50% heavy metal settling agent, adding heavy metal Ca (OH) 2 to increase the pH value of the wastewater, so that hydroxide precipitates are generated from heavy metal ions such as Fe3+, Zn2+, Cu2+, Ni2+, Cr3+ and the like;
selecting 30% antiscaling agent to prepare a standby liquid of 55 mg/ml;
step three: adding a medicament: adding a diluent, a heavy metal settling agent and a standby liquid into a treatment device according to the milliliter number of the medicament diluent corresponding to different adding concentrations;
the inner wall of the treatment device is made of carbon-plastic alloy, a heating circulating pipe fitting is arranged in an interlayer of the inner wall of the treatment device, the output end of the treatment device is connected with a concentrator, and the output end of the concentrator is connected with a crystallizer;
step four: and (3) medicament fusion:
s1, stirring the desulfurized wastewater for 35min by using a magnetic stirring structure after the desulfurized wastewater is internally filled, standing for 15min, wherein the treatment device consists of three separation tanks, each separation tank is filled with the desulfurized wastewater and then automatically flows into the next separation tank, lime slurry is added while the desulfurized wastewater enters the first separation tank, and stirring is carried out to keep the pH value to be 9;
s2, adding organic sulfide into the second separation tank, and reacting the organic sulfide with Pb2+ and Hg2+ to form insoluble sulfide for deposition;
s3: adding a flocculating agent into the third separation tank, and adding cationic polymer polyelectrolyte as a coagulant aid at the outlet of the treatment device to reduce the surface tension of the particles, strengthen the growth process of the particles and further promote the precipitation of hydroxide and sulfide;
s4: the impurities which are not scaled are discharged into an ash slurry tank through a sludge pump, the purified water at the upper part flows to a purified water tank through an overflow port at the periphery of the clarification/concentration tank, the purified water tank is provided with an online monitoring instrument for monitoring the pH value and suspended matters of the purified water, and the purified water is transmitted to a concentrator after being qualified;
step five: and (3) subsequent treatment: a concentrator is used for concentration treatment, and a crystallizer is matched for crystallization treatment, wherein a pump body structure is applied in the transmission process of the treatment;
step six: and (3) detection: the steps of evaporating, concentrating and crystallizing the treated wastewater all need to be subjected to liquid detection so as to perfect the adding conditions of a diluent, a heavy metal settling agent and a standby liquid.
Wherein, the adding amount of the heavy metal settling agent is 25 percent of the total amount of the desulfurization wastewater, the adding amount of the antiscaling agent is 20 percent of the total amount of the desulfurization wastewater, and the connecting ends of the treatment device, the concentrator and the crystallizer are all sleeved with sealing structures.
Example 2
A multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater comprises the following steps:
the method comprises the following steps: water sample pretreatment: collecting the desulfurization wastewater, and pretreating suspended matters, supersaturated sulfite, sulfate and heavy metals contained in the desulfurization wastewater;
step two: selecting a medicament:
selecting a 40% ammonia nitrogen remover and a 40% COD remover to prepare a diluent of 25mg/ml, wherein the diluent needs to ensure that the diluent is stored in a sealing structure;
adding 35% heavy metal settling agent and heavy metal precipitate Ca (OH) 2 to increase the pH value of the wastewater, so that hydroxide precipitates are generated from heavy metal ions such as Fe3+, Zn2+, Cu2+, Ni2+, Cr3+ and the like;
selecting 15% antiscaling agent to prepare a standby liquid of 55 mg/ml;
step three: adding a medicament: adding a diluent, a heavy metal settling agent and a standby liquid into a treatment device according to the milliliter number of the medicament diluent corresponding to different adding concentrations;
the inner wall of the treatment device is made of carbon-plastic alloy, a heating circulating pipe fitting is arranged in an interlayer of the inner wall of the treatment device, the output end of the treatment device is connected with a concentrator, and the output end of the concentrator is connected with a crystallizer;
step four: and (3) medicament fusion:
s1, stirring the desulfurized wastewater for 25min by using a magnetic stirring structure after the desulfurized wastewater is internally filled, standing for 3min, wherein the treatment device consists of three separation tanks, each separation tank is filled with the desulfurized wastewater and then automatically flows into the next separation tank, lime slurry is added while the desulfurized wastewater enters the first separation tank, and stirring is carried out to keep the pH value to be 7;
s2, adding organic sulfide into the second separation tank, and reacting the organic sulfide with Pb2+ and Hg2+ to form insoluble sulfide for deposition;
s3: adding a flocculating agent into the third separation tank, and adding cationic polymer polyelectrolyte as a coagulant aid at the outlet of the treatment device to reduce the surface tension of the particles, strengthen the growth process of the particles and further promote the precipitation of hydroxide and sulfide;
s4: the impurities which are not scaled are discharged into an ash slurry tank through a sludge pump, the purified water at the upper part flows to a purified water tank through an overflow port at the periphery of the clarification/concentration tank, the purified water tank is provided with an online monitoring instrument for monitoring the pH value and suspended matters of the purified water, and the purified water is transmitted to a concentrator after being qualified;
step five: and (3) subsequent treatment: a concentrator is used for concentration treatment, and a crystallizer is matched for crystallization treatment, wherein a pump body structure is applied in the transmission process of the treatment;
step six: and (3) detection: the steps of evaporating, concentrating and crystallizing the treated wastewater all need to be subjected to liquid detection so as to perfect the adding conditions of a diluent, a heavy metal settling agent and a standby liquid.
Wherein the adding amount of the heavy metal settling agent is 20 percent of the total amount of the desulfurization wastewater, the adding amount of the scale inhibitor is 10 percent of the total amount of the desulfurization wastewater, and the connecting ends of the treatment device, the concentrator and the crystallizer are all sleeved with sealing structures.
Example 3
A multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater comprises the following steps:
the method comprises the following steps: water sample pretreatment: collecting the desulfurization wastewater, and pretreating suspended matters, supersaturated sulfite, sulfate and heavy metals contained in the desulfurization wastewater;
step two: selecting a medicament:
selecting 50% ammonia nitrogen remover and 46% COD remover to prepare diluent of 25mg/ml, wherein the diluent needs to ensure that the diluent is stored in a sealing structure;
selecting 45% heavy metal settling agent, adding heavy metal Ca (OH) 2 to increase the pH value of the wastewater, so that hydroxide precipitates are generated from heavy metal ions such as Fe3+, Zn2+, Cu2+, Ni2+, Cr3+ and the like;
selecting 25% antiscaling agent to prepare a standby liquid of 55 mg/ml;
step three: adding a medicament: adding a diluent, a heavy metal settling agent and a standby liquid into a treatment device according to the milliliter number of the medicament diluent corresponding to different adding concentrations;
the inner wall of the treatment device is made of carbon-plastic alloy, a heating circulating pipe fitting is arranged in an interlayer of the inner wall of the treatment device, the output end of the treatment device is connected with a concentrator, and the output end of the concentrator is connected with a crystallizer;
step four: and (3) medicament fusion:
s1, stirring the desulfurized wastewater for 30min by using a magnetic stirring structure after the desulfurized wastewater is internally filled, standing for 10min, wherein the treatment device consists of three separation tanks, each separation tank is filled with the desulfurized wastewater and then automatically flows into the next separation tank, lime slurry is added while the desulfurized wastewater enters the first separation tank, and stirring is carried out to keep the pH value to be 8;
s2, adding organic sulfide into the second separation tank, and reacting the organic sulfide with Pb2+ and Hg2+ to form insoluble sulfide for deposition;
s3: adding a flocculating agent into the third separation tank, and adding cationic polymer polyelectrolyte as a coagulant aid at the outlet of the treatment device to reduce the surface tension of the particles, strengthen the growth process of the particles and further promote the precipitation of hydroxide and sulfide;
s4: the impurities which are not scaled are discharged into an ash slurry tank through a sludge pump, the purified water at the upper part flows to a purified water tank through an overflow port at the periphery of the clarification/concentration tank, the purified water tank is provided with an online monitoring instrument for monitoring the pH value and suspended matters of the purified water, and the purified water is transmitted to a concentrator after being qualified;
step five: and (3) subsequent treatment: a concentrator is used for concentration treatment, and a crystallizer is matched for crystallization treatment, wherein a pump body structure is applied in the transmission process of the treatment;
step six: and (3) detection: the steps of evaporating, concentrating and crystallizing the treated wastewater all need to be subjected to liquid detection so as to perfect the adding conditions of a diluent, a heavy metal settling agent and a standby liquid.
Wherein the adding amount of the heavy metal settling agent is 22 percent of the total amount of the desulfurization wastewater, the adding amount of the scale inhibitor is 15 percent of the total amount of the desulfurization wastewater, and the connecting ends of the treatment device, the concentrator and the crystallizer are all sleeved with sealing structures.
By combining the above steps, the method for treating the scale and corrosion-resistant desulfurization wastewater by comprehensive utilization of multiple-effect evaporation concentration crystallization can gradually precipitate suspended matters in the treatment process of the desulfurization wastewater, and the treatment modes of adding multiple agents and fusing agents are matched with each other, so that the defects of scale and corrosion in the desulfurization wastewater treatment are effectively reduced, the purpose of comprehensive treatment is achieved by matching the treatment modes in steps and detecting in sections, and the method has a strong treatment effect and strong circulation stability.
While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the embodiments disclosed herein may be used in any combination, provided that there is no structural conflict, and the combinations are not exhaustively described in this specification merely for the sake of brevity and conservation of resources. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (4)

1. A multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: water sample pretreatment: collecting the desulfurization wastewater, and pretreating suspended matters, supersaturated sulfite, sulfate and heavy metals contained in the desulfurization wastewater;
step two: selecting a medicament:
selecting 40-60% ammonia nitrogen remover and 40-56% COD remover to prepare diluent of 25mg/ml, wherein the diluent needs to ensure that the diluent is stored in a sealing structure;
adding 35-50% of heavy metal settling agent and heavy metal precipitate Ca (OH) 2 to improve the pH value of the wastewater so that heavy metal ions such as Fe3+, Zn2+, Cu2+, Ni2+, Cr3+ and the like generate hydroxide precipitate;
selecting 15-30% of scale inhibitor to prepare a spare liquid of 55 mg/ml;
step three: adding a medicament: adding a diluent, a heavy metal settling agent and a standby liquid into a treatment device according to the milliliter number of the medicament diluent corresponding to different adding concentrations;
the inner wall of the treatment device is made of carbon-plastic alloy, a heating circulating pipe fitting is arranged in an interlayer of the inner wall of the treatment device, the output end of the treatment device is connected with a concentrator, and the output end of the concentrator is connected with a crystallizer;
step four: and (3) medicament fusion:
s1, stirring the desulfurized wastewater for 25-35 min by using a magnetic stirring structure after the desulfurized wastewater is internally filled, standing for 3-15 min, wherein a treatment device consists of three separation grooves, each separation groove automatically flows into the next separation groove after being filled, lime slurry is added while the desulfurized wastewater enters the first separation groove, and stirring is carried out to keep the pH value at 7-9;
s2, adding organic sulfide into the second separation groove to react with Pb2+ and Hg2+ to form insoluble sulfide for deposition;
s3: adding a flocculating agent into the third separation tank, and adding cationic polymer polyelectrolyte serving as a coagulant aid into the outlet of the treatment device to reduce the surface tension of the particles, strengthen the growth process of the particles and further promote the precipitation of hydroxide and sulfide;
s4: the impurities which are not scaled are discharged into the mortar tank through a sludge pump, the purified water at the upper part flows to a purified water tank through an overflow port at the periphery of the clarification/concentration tank, the purified water tank is provided with an online monitoring instrument for monitoring the pH value and suspended matters of the purified water, and the purified water is transmitted to the concentrator after being qualified;
step five: and (3) subsequent treatment: the concentrator is used for concentration treatment, and the crystallizer is matched for crystallization treatment, and a pump body structure is applied in the transmission process of the treatment;
step six: and (3) detection: the steps of evaporating, concentrating and crystallizing the treated wastewater all need to be subjected to liquid detection so as to perfect the adding conditions of a diluent, a heavy metal settling agent and a standby liquid.
2. The multi-effect evaporation, concentration and crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater as recited in claim 1, characterized in that: the adding amount of the heavy metal settling agent is 20-25% of the total amount of the desulfurization wastewater.
3. The multi-effect evaporation, concentration and crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater as recited in claim 2, characterized in that: the adding amount of the antiscaling agent is 10-20% of the total amount of the desulfurization wastewater.
4. The multi-effect evaporation, concentration and crystallization treatment method for comprehensive utilization of desulfurization wastewater with scale and corrosion prevention according to claim 3, characterized in that: and sealing structures are sleeved at the connecting ends of the processing device, the concentrator and the crystallizer.
CN202010841811.XA 2020-08-20 2020-08-20 Multi-effect evaporation concentration crystallization treatment method for comprehensive utilization of anti-scaling and anti-corrosion desulfurization wastewater Pending CN111995151A (en)

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