CN112875824A - Desulfurization wastewater zero-discharge system and method based on self-crystallization fluidized bed - Google Patents
Desulfurization wastewater zero-discharge system and method based on self-crystallization fluidized bed Download PDFInfo
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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
- C02F1/52—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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/101—Sulfur compounds
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention provides a desulfurization wastewater zero-discharge system and method based on a self-crystallizing fluidized bed, which comprises an aeration conditioning tank, wherein desulfurization wastewater is output to the aeration conditioning tank; the aeration hardening and tempering tank is connected with the gypsum reaction fluidized bed through a lifting pump; the magnesium removal reaction fluidized bed outputs the gypsum reaction fluidized bed to the magnesium removal reaction fluidized bed; the magnesium removal reaction fluidized bed is output to the sulfur removal reaction fluidized bed; the desulfurization reaction fluidized bed is output to the dechlorination reaction fluidized bed; and a lime dissolving, metering and dosing device. The desulfurization wastewater zero-discharge system and the method based on the self-crystallization fluidized bed realize the purification of the desulfurization wastewater, the zero-discharge system has a simple structure, is easy to realize automation, avoids the technical problems of salt and ash accumulation in a flue, unstable unit operation, limited treatment capacity and the like in the traditional method, and greatly reduces the environmental problem and the production cost in the desulfurization process because the treated water reaches the recycling standard.
Description
Technical Field
The invention relates to the technical field of desulfurization wastewater treatment, in particular to a desulfurization wastewater zero-discharge system and method based on a self-crystallizing fluidized bed.
Background
Flue gas desulfurization waste water of thermal power factory is the terminal high salt waste water after the water treatment cascade of power plant uses, has realized the zero release of desulfurization waste water, means the power plant and is close or has realized the zero release of whole factory promptly.
In recent years, domestic power plant desulfurization wastewater zero discharge is mainly realized by adopting various evaporative crystallization technologies, such as: the method comprises the steps of flue bypass evaporation, low-temperature flue heating/triple-effect evaporation, flue spray evaporation, softening/membrane treatment/MVR coupling, wherein the first three methods are used for operation for a period of time, and the successive discovery shows that the desulfurization wastewater evaporation is realized by utilizing the flue gas heat, the salt and ash accumulated in the rear flue cause the unit to be unstable in operation, the treatment capacity is limited, and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a desulfurization wastewater zero-discharge system and a desulfurization wastewater zero-discharge method based on a self-crystallization fluidized bed, which realize the purification of desulfurization wastewater, have a simple structure, are easy to realize automation, and avoid the technical problems of salt and ash accumulation in a flue, unstable unit operation, limited treatment capacity and the like in the traditional method.
In order to achieve the above purpose, the invention adopts a technical scheme that:
a desulfurization waste water zero release system based on self-crystallization fluidized bed comprises: the desulfurization wastewater is output to the aeration conditioning tank; the aeration hardening and tempering tank is connected with the gypsum reaction fluidized bed through a lifting pump, the mixed liquid in the gypsum reaction fluidized bed circulates through a first circulating pump, and a coagulant dosing device is output to the output end of the first circulating pump; the gypsum reaction fluidized bed is output to the magnesium removal reaction fluidized bed, and the mixed liquid in the magnesium removal reaction fluidized bed is circulated through a second circulating pump; the magnesium removal reaction fluidized bed is output to the sulfur removal reaction fluidized bed, a mixed liquid in the sulfur removal reaction fluidized bed circulates through a third circulating pump, and a coagulant aid dosing device outputs the output end of the second circulating pump and the output end of the third circulating pump; the desulfurization reaction fluidized bed is output to the desulfurization reaction fluidized bed, the mixed liquid in the desulfurization reaction fluidized bed is circulated through a fourth circulating pump, and the sodium metaaluminate dissolving, metering and dosing device is output to the output ends of the third circulating pump and the fourth circulating pump; and the lime dissolving, metering and dosing device is used for respectively outputting lime milk to the output ends of the first circulating pump, the second circulating pump, the third circulating pump and the fourth circulating pump.
Further, the device also comprises a Roots blower which is connected with the aeration conditioning tank. A
Further, the gypsum reaction fluidized bed is connected with a gypsum slurry tank of the flue gas desulfurization system through a gypsum slurry delivery pump.
Further, the magnesium removal reaction fluidized bed is connected with a first dehydrator through a magnesium hydroxide crystal delivery pump, and the first dehydrator outputs to a first mud bucket; the desulfurization reaction fluidized bed is connected with a second dehydrator through an ettringite delivery pump, and the second dehydrator outputs to a second mud bucket; the dechlorination reaction fluidized bed is connected with a third dehydrator through a Freund salt delivery pump, and the third dehydrator outputs to a third mud bucket.
Further, weighing the sodium metaaluminate in the sodium metaaluminate powder bin by a sodium metaaluminate metering device, and adding the weighed sodium metaaluminate into the sodium metaaluminate dissolving, metering and dosing device; and the hydrated lime in the lime powder bin is weighed by a lime metering device and then added into the lime dissolving metering dosing device.
The invention also provides a desulfurization wastewater zero-discharge method based on the self-crystallization fluidized bed, which comprises the following steps: s10, outputting desulfurization wastewater discharged from a wastewater cyclone of a flue gas desulfurization tower of a thermal power plant to an aeration conditioning tank, introducing dissolved oxygen into the aeration conditioning tank to reduce the chemical oxygen demand of the desulfurization wastewater in the aeration conditioning tank, and removing reducing substances in the desulfurization wastewater to obtain a first mixed solution; s20, lifting the first mixed solution to a gypsum reaction fluidized bed through a lifting pump, circulating the first mixed solution in the gypsum reaction fluidized bed through a first circulating pump, respectively adding lime milk and a coagulant to the output end of the first circulating pump, and removing sulfate ions in the first mixed solution to obtain a second mixed solution; s30, outputting the second mixed solution to a magnesium removal reaction fluidized bed, circulating the second mixed solution in the magnesium removal reaction fluidized bed through a second circulating pump, adding lime milk, a coagulant aid and a heavy metal capture agent to the output end of the second circulating pump respectively, adjusting the pH value of the second mixed solution to be more than 11, removing magnesium ions in the second mixed solution, and obtaining a third mixed solution; s40, outputting the third mixed solution to a desulfurization reaction fluidized bed, circulating the third mixed solution in the desulfurization reaction fluidized bed through a third circulating pump, adding lime milk, a coagulant aid and sodium metaaluminate to the output end of the third circulating pump respectively, maintaining the pH value of the third mixed solution at 10.9-11.1, further removing sulfate radicals in the third mixed solution and removing partial chloride ions at the same time, and obtaining a fourth mixed solution; s50, outputting the fourth mixed solution to a dechlorination reaction fluidized bed, circulating the fourth mixed solution in the dechlorination reaction fluidized bed through a fourth circulating pump, respectively adding lime milk and sodium metaaluminate to the output end of the fourth circulating pump, further removing chloride ions in the fourth mixed solution, and obtaining clean recyclable liquid, wherein the recyclable liquid is used as recycled water of a desulfurizing tower for recycling.
Further, in the step S10, dissolved oxygen is introduced into the aeration conditioning tank by a roots blower, and the reducing substances include at least one of nitrite and sulfite.
Further, calcium sulfate precipitate is generated in the step S20, and the calcium sulfate precipitate is output to a gypsum slurry tank of the desulfurization system through a gypsum slurry delivery pump and dehydrated to form a byproduct gypsum; magnesium hydroxide precipitate is generated in the step S30, and the magnesium hydroxide precipitate is conveyed to a first dehydrator through a magnesium hydroxide conveying pump to be dehydrated and then is output to a first mud bucket for later use; ettringite and Freund 'S salt precipitates are generated in the step S40, and the ettringite and Freund' S salt precipitates in the step S40 are dehydrated by a second dehydrator and then output to a second mud bucket for later use; and a Freund 'S salt precipitate is generated in the step S50, and the Freund' S salt precipitate in the step S50 is dehydrated by a third dehydrator and then is output to a third mud bucket for standby.
Further, the coagulant aid content of the second mixed solution circulated in the step S30 is 5 ppm; the third mixed solution circulated in the step S40 has a sodium metaaluminate solution content of 5% and a coagulant aid content of 5 ppm; the molar ratio of chloride ions, aluminum ions, and calcium ions in the fourth mixed solution circulated in the step S50 is 1:3: 8.
Compared with the prior art, the technical scheme of the invention has the following advantages:
according to the desulfurization wastewater zero-discharge system and method based on the self-crystallization fluidized bed, impurities such as reducing substances, sulfate ions, magnesium ions, chloride ions, other heavy metal ions, suspended matters and the like in desulfurization wastewater are removed through the aeration conditioning tank, the gypsum reaction fluidized bed, the magnesium removal reaction fluidized bed, the sulfur removal reaction fluidized bed and the chlorine removal reaction fluidized bed respectively, and the purification of the desulfurization wastewater is realized.
Drawings
The technical solution and the advantages of the present invention will be apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1 shows a desulfurization waste water zero discharge system structure based on an auto-crystallization fluidized bed according to an embodiment of the present invention;
FIG. 2 is a flow chart of a desulfurization waste water zero discharge method based on an auto-crystallization fluidized bed according to an embodiment of the present invention.
Reference numbers in the figures:
11 aeration quenching and tempering ponds, 12 lift pumps, 13 Roots blower, 21 gypsum reaction fluidized bed, 22 first circulating pump, 23 gypsum slurry delivery pump, 24 gypsum slurry tank, 3 coagulant adding device, 41 magnesium removal reaction fluidized bed, 42 second circulating pump, 43 magnesium hydroxide crystal delivery pump, 44 first dehydrator, 45 first hopper
51 desulfurization reaction fluidized bed, 52 third circulating pump, 53 ettringite delivery pump, 54 second dehydrator, 55 second hopper, 6 coagulant aid dosing device, 71 dechlorination reaction fluidized bed, 72 fourth circulating pump, 73 freund's salt delivery pump, 74 third dehydrator, 75 third hopper, 81 sodium metaaluminate dissolving, metering and dosing device, 82 sodium metaaluminate powder bin, 83 sodium metaaluminate metering device, 91 lime dissolving, metering and dosing device, 92 lime powder bin and 93 lime metering device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 embodiment provides a desulfurization wastewater zero discharge system based on a self-crystallization fluidized bed, as shown in fig. 1, the system comprises an aeration conditioning tank 11, a gypsum reaction fluidized bed 21, a magnesium removal reaction fluidized bed 41, a sulfur removal reaction fluidized bed 51, a chlorine removal reaction fluidized bed 71 and a lime dissolution metering and dosing device 91, desulfurization wastewater is output to the aeration conditioning tank 11, the aeration conditioning tank 11 is connected with the gypsum reaction fluidized bed 21 through a lift pump 12, the gypsum reaction fluidized bed 21 is output to the magnesium removal reaction fluidized bed 41, the magnesium removal reaction fluidized bed 41 is output to the sulfur removal reaction fluidized bed 51, and the sulfur removal reaction fluidized bed 51 is output to the chlorine removal reaction fluidized bed 71.
The aeration conditioning tank 11 is connected with a Roots blower 13, and the Roots blower 13 belongs to a positive displacement blower. The roots blower 13 is a rotary compressor which compresses and conveys gas by utilizing the relative movement of two blade-shaped rotors in a cylinder, has simple structure and convenient manufacture, is widely applied to aquaculture oxygenation, sewage treatment aeration and cement conveying, is more suitable for a gas conveying and pressurizing system in a low-pressure occasion, and can also be used as a vacuum pump and the like. Because the water quality of the desulfurization wastewater is complex in composition and high in fluctuation, the water quality of the desulfurization wastewater is fully mixed under the aeration condition, and conditions are created for stable operation of subsequent treatment. The volume of the aeration conditioning tank is not less than the treatment capacity of the desulfurization wastewater for 24 hours.
Mixed liquid in the gypsum reaction fluidized bed 21 circulates through a first circulating pump 22, and the coagulant dosing device 3 outputs to the output end of the first circulating pump 22, the gypsum reaction fluidized bed 21 is connected with a gypsum slurry tank 24 of a desulfurization wastewater zero discharge system through a gypsum slurry delivery pump 23.
The mixed liquid in the magnesium removal reaction fluidized bed 41 circulates through a second circulating pump 42, the magnesium removal reaction fluidized bed 41 is connected with a first dehydrator 44 through a magnesium hydroxide crystal delivery pump 43, and the first dehydrator 44 outputs to a first mud bucket 45.
The mixed liquid in the desulfurization reaction fluidized bed 51 circulates through a third circulating pump 52, a coagulant aid dosing device 6 outputs the output end of the second circulating pump 42 and the output end of the third circulating pump 52, the desulfurization reaction fluidized bed 51 is connected with a second dehydrator 54 through an ettringite conveying pump 53, and the second dehydrator 54 outputs to a second mud bucket 55.
The mixed liquid in the dechlorination fluidized bed 71 circulates through a fourth circulating pump 72, and the sodium metaaluminate dissolving, metering and dosing device 81 is output to the output ends of the third circulating pump 52 and the fourth circulating pump 72. The dechlorination fluidized bed 71 is connected to a third dehydrator 74 through a freund salt transfer pump 73, and the third dehydrator 74 outputs to a third hopper 75. The sodium metaaluminate in the sodium metaaluminate powder bin 82 is weighed by a sodium metaaluminate metering device 83 and then added into the sodium metaaluminate dissolving, metering and dosing device 81.
The lime dissolving, metering and dosing device 91 outputs lime milk to the output ends of the first circulating pump 22, the second circulating pump 42, the third circulating pump 52 and the fourth circulating pump 72 respectively. The slaked lime in the lime powder bin 92 is weighed by a lime metering device 93 and then added into the lime dissolving metering dosing device 91.
As shown in FIG. 2, the invention also provides a desulfurization waste water zero-discharge method based on the self-crystallization fluidized bed, which comprises the following steps: s10 desulfurization waste water discharged from the waste water cyclone of the flue gas desulfurization tower of the thermal power plant is output to an aeration conditioning tank 11, dissolved oxygen is introduced into the aeration conditioning tank 11 to reduce the chemical oxygen demand of the desulfurization waste water in the aeration conditioning tank 11, and reducing substances in the desulfurization waste water are removed to obtain a first mixed solution. S20, lifting the first mixed solution to a gypsum reaction fluidized bed 21 through a lifting pump 12, circulating the first mixed solution in the gypsum reaction fluidized bed 21 through a first circulating pump 22, adding lime milk and a coagulant to the output end of the first circulating pump 22 respectively, and removing sulfate ions in the first mixed solution to obtain a second mixed solution. S30, outputting the second mixed solution to a magnesium removal reaction fluidized bed 41, circulating the second mixed solution in the magnesium removal reaction fluidized bed 41 through a second circulating pump 42, adding lime milk, a coagulant aid and a heavy metal capture agent to the output end of the second circulating pump 42 respectively, adjusting the pH value of the second mixed solution to be more than 11, removing magnesium ions in the second mixed solution, and obtaining a third mixed solution. S40, outputting the third mixed solution to a desulfurization reaction fluidized bed 51, circulating the third mixed solution in the desulfurization reaction fluidized bed 51 through a third circulating pump 52, adding lime milk, a coagulant aid and sodium metaaluminate to the output end of the third circulating pump 52 respectively, maintaining the pH value of the third mixed solution at 10.9-11.1, further removing sulfate radicals in the third mixed solution and removing partial chloride ions at the same time, and obtaining a fourth mixed solution. S50, outputting the fourth mixed solution to a dechlorination reaction fluidized bed 71, circulating the fourth mixed solution in the dechlorination reaction fluidized bed 71 through a fourth circulating pump 72, adding lime milk and sodium metaaluminate to the output end of the fourth circulating pump 72 respectively, further removing chloride ions in the fourth mixed solution, and obtaining clean recyclable liquid which is used as the reuse water of the desulfurizing tower for recycling.
In the step S10, dissolved oxygen is introduced into the aeration tempering tank 11 by the roots blower 13, and the reducing substances include at least one of nitrite and sulfite.
In the step S20, calcium ions in the lime milk react with sulfate ions in the first mixed solution to generate calcium sulfate precipitate, the sulfate treatment efficiency in this process is 40 to 50%, the calcium sulfate precipitate is output to the gypsum slurry tank 24 of the desulfurization system through the gypsum slurry delivery pump 23 and is dehydrated through the vacuum belt conveyor to form gypsum as a byproduct, and the supernatant is output to the magnesium removal reaction fluidized bed 41 as a second mixed solution.
The coagulant aid content of the second mixed solution circulated in the step S30 is 5ppm, and the coagulant aid isAnd the use amount of the heavy metal trapping agent can be determined according to the content of magnesium ions in the second mixed solution. The heavy metal trapping agent is a chemical agent strongly chelated with heavy metal ions and can react with Cu in wastewater at normal temperature and in a wide pH value range2+、Cd2 +、Hg2+、Pb2+、Mn2+、Ni2+、Zn2+、Cr3+And various heavy metal ions are subjected to chemical reaction, and insoluble flocculent precipitate with low water content and easy filtration removal is rapidly generated in a short time, so that the chemicals for removing the heavy metal ions from the sewage are obtained. The step S30 is mainly used for removing Mg in the second mixed solution2+The first heavy metal ion. The hydroxide ions and the magnesium ions in the lime milk generate magnesium hydroxide precipitate, the magnesium hydroxide precipitate is conveyed to a first dehydrator 44 through a magnesium hydroxide conveying pump to be dehydrated and then is output to a first mud bucket 45 for standby application, and the dehydrator needs to be specially designed and mainly adopts hydrophobic filter cloth due to the difficulty in dehydrating the magnesium hydroxide. And a filter cake generated by dehydrating the heavy metal precipitate can be used as a flame retardant to be added into the gypsum board, and the supernatant liquid left after dehydration is used as a third mixed liquid to enter the desulfurization reaction fluidized bed for next purification.
In the step S40, sodium metaaluminate reacts with sulfate radicals in the presence of supersaturated calcium to generate ettringite, redundant sodium metaaluminate reacts with partial chloride ions in water to generate Freund 'S salt precipitate, and the ettringite and the Freund' S salt precipitate in the step S40 are dehydrated by the second dehydrator 54 and then output to the second mud bucket 55 for later use. The third mixed solution circulated in the step S40 has a sodium metaaluminate solution content of 5% and a coagulant aid content of 5 ppm. And the step S40 is mainly used for removing residual sulfate radicals and chloride ions in the third mixed solution, removing ettringite and Freund' S salt precipitates, and outputting a fourth mixed solution to the dechlorination fluidized bed. Wherein the content of the sodium metaaluminate solution and the content of the coagulant aid can be adjusted and determined according to specific water quality.
In the step S50, a precipitation of the freund salt is generated, and the precipitation of the freund salt in the step S50 is dehydrated by the third dehydrator 74 and then output to the third hopper 75 for use. And the molar ratio of chloride ions to aluminum ions to calcium ions of the circulated fourth mixed solution in the step S50 is 1:3:8, and the clean water of the lake after the precipitation of the Freund' S salt is removed can be returned to the desulfurizing tower for recycling. The step S40 and the step S50 form a secondary dechlorination process, and the dechlorination efficiency is ensured to be more than 70%.
The ettringite and the Freund salt generated by the desulfurization wastewater zero-discharge method can be mixed with slag of a thermal power plant, and if a boiler of the thermal power plant is a wet slag-removing system, slurry can be directly sent to the wet slag-removing system for precipitation, so that the system is simplified, and the investment is reduced.
The above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes that are transformed by the content of the present specification and the attached drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A desulfurization waste water zero release system based on self-crystallization fluidized bed, characterized by comprising:
the desulfurization wastewater is output to the aeration conditioning tank;
the aeration hardening and tempering tank is connected with the gypsum reaction fluidized bed through a lifting pump, the mixed liquid in the gypsum reaction fluidized bed circulates through a first circulating pump, and a coagulant dosing device is output to the output end of the first circulating pump;
the gypsum reaction fluidized bed is output to the magnesium removal reaction fluidized bed, and the mixed liquid in the magnesium removal reaction fluidized bed is circulated through a second circulating pump;
the magnesium removal reaction fluidized bed is output to the sulfur removal reaction fluidized bed, a mixed liquid in the sulfur removal reaction fluidized bed circulates through a third circulating pump, and a coagulant aid dosing device outputs the output end of the second circulating pump and the output end of the third circulating pump;
the desulfurization reaction fluidized bed is output to the desulfurization reaction fluidized bed, the mixed liquid in the desulfurization reaction fluidized bed is circulated through a fourth circulating pump, and the sodium metaaluminate dissolving, metering and dosing device is output to the output ends of the third circulating pump and the fourth circulating pump; and
and the lime dissolving and metering dosing device is used for respectively outputting lime milk to the output ends of the first circulating pump, the second circulating pump, the third circulating pump and the fourth circulating pump.
2. The desulfurization waste water zero discharge system based on self-crystallizing fluidized bed as claimed in claim 1, further comprising a Roots blower connected with the aeration conditioning tank.
3. The desulfurization waste water zero discharge system based on self-crystallization fluidized bed of claim 1, characterized in that the gypsum reaction fluidized bed is connected with the gypsum slurry tank of the flue gas desulfurization system through a gypsum slurry transfer pump.
4. The desulfurization waste water zero-emission system based on the self-crystallization fluidized bed as claimed in claim 1, wherein the magnesium removal reaction fluidized bed is connected with a first dehydrator through a magnesium hydroxide crystal delivery pump, and the first dehydrator outputs to a first mud bucket; the desulfurization reaction fluidized bed is connected with a second dehydrator through an ettringite delivery pump, and the second dehydrator outputs to a second mud bucket; the dechlorination reaction fluidized bed is connected with a third dehydrator through a Freund salt delivery pump, and the third dehydrator outputs to a third mud bucket.
5. The desulfurization waste water zero discharge system based on the self-crystallization fluidized bed as claimed in claim 1, characterized in that the sodium metaaluminate in the sodium metaaluminate powder bin is weighed by a sodium metaaluminate metering device and then added into the sodium metaaluminate dissolving, metering and dosing device; and the hydrated lime in the lime powder bin is weighed by a lime metering device and then added into the lime dissolving metering dosing device.
6. A desulfurization waste water zero discharge method based on a self-crystallization fluidized bed is characterized by comprising the following steps:
s10, outputting desulfurization wastewater discharged from a wastewater cyclone of a flue gas desulfurization tower of a thermal power plant to an aeration conditioning tank, introducing dissolved oxygen into the aeration conditioning tank to reduce the chemical oxygen demand of the desulfurization wastewater in the aeration conditioning tank, and removing reducing substances in the desulfurization wastewater to obtain a first mixed solution;
s20, lifting the first mixed solution to a gypsum reaction fluidized bed through a lifting pump, circulating the first mixed solution in the gypsum reaction fluidized bed through a first circulating pump, respectively adding lime milk and a coagulant to the output end of the first circulating pump, and removing sulfate ions in the first mixed solution to obtain a second mixed solution;
s30, outputting the second mixed solution to a magnesium removal reaction fluidized bed, circulating the second mixed solution in the magnesium removal reaction fluidized bed through a second circulating pump, adding lime milk, a coagulant aid and a heavy metal capture agent to the output end of the second circulating pump respectively, adjusting the pH value of the second mixed solution to be more than 11, removing magnesium ions in the second mixed solution, and obtaining a third mixed solution;
s40, outputting the third mixed solution to a desulfurization reaction fluidized bed, circulating the third mixed solution in the desulfurization reaction fluidized bed through a third circulating pump, adding lime milk, a coagulant aid and sodium metaaluminate to the output end of the third circulating pump respectively, maintaining the pH value of the third mixed solution at 10.9-11.1, further removing sulfate radicals in the third mixed solution and removing partial chloride ions at the same time, and obtaining a fourth mixed solution;
s50, outputting the fourth mixed solution to a dechlorination reaction fluidized bed, circulating the fourth mixed solution in the dechlorination reaction fluidized bed through a fourth circulating pump, respectively adding lime milk and sodium metaaluminate to the output end of the fourth circulating pump, further removing chloride ions in the fourth mixed solution, and obtaining clean recyclable liquid, wherein the recyclable liquid is used as recycled water of a desulfurizing tower for recycling.
7. The self-crystallization fluidized bed-based desulfurization wastewater zero discharge method according to claim 6, wherein the step S10 is implemented by introducing dissolved oxygen into the aeration conditioning tank through a Roots blower, and the reducing substances comprise at least one of nitrite and sulfite.
8. The desulfurization waste water zero emission method based on the self-crystallization fluidized bed as claimed in claim 6, wherein calcium sulfate precipitate is generated in the step S20, and the calcium sulfate precipitate is output to a gypsum slurry tank of the desulfurization system through a gypsum slurry delivery pump and is dehydrated to form gypsum as a byproduct; magnesium hydroxide precipitate is generated in the step S30, and the magnesium hydroxide precipitate is conveyed to a first dehydrator through a magnesium hydroxide conveying pump to be dehydrated and then is output to a first mud bucket for later use; ettringite and Freund 'S salt precipitates are generated in the step S40, and the ettringite and Freund' S salt precipitates in the step S40 are dehydrated by a second dehydrator and then output to a second mud bucket for later use; and a Freund 'S salt precipitate is generated in the step S50, and the Freund' S salt precipitate in the step S50 is dehydrated by a third dehydrator and then is output to a third mud bucket for standby.
9. The method for zero discharge of desulfurization waste water based on self-crystallizing fluidized bed as claimed in claim 6, wherein the coagulant aid content of the second mixed solution circulated in the S30 step is 5 ppm; the third mixed solution circulated in the step S40 has a sodium metaaluminate solution content of 5% and a coagulant aid content of 5 ppm; the molar ratio of chloride ions, aluminum ions, and calcium ions in the fourth mixed solution circulated in the step S50 is 1:3: 8.
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| CN113461237A (en) * | 2021-07-27 | 2021-10-01 | 江苏海容热能环境工程有限公司 | Zero discharge system for salt wastewater treatment |
| CN114262097A (en) * | 2021-12-16 | 2022-04-01 | 西安西热水务环保有限公司 | Wastewater dechlorination system and method based on electrolytic aluminum coupling chemical precipitation |
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| CN114262097B (en) * | 2021-12-16 | 2023-11-21 | 西安西热水务环保有限公司 | Electrolytic aluminum coupling chemical precipitation wastewater chlorine removal system and method |
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