CN115594270B - Desulfurization wastewater pretreatment reagent, preparation method, pretreatment system and pretreatment method - Google Patents
Desulfurization wastewater pretreatment reagent, preparation method, pretreatment system and pretreatment method Download PDFInfo
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- CN115594270B CN115594270B CN202211227191.6A CN202211227191A CN115594270B CN 115594270 B CN115594270 B CN 115594270B CN 202211227191 A CN202211227191 A CN 202211227191A CN 115594270 B CN115594270 B CN 115594270B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 124
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 120
- 230000023556 desulfurization Effects 0.000 title claims abstract description 120
- 238000002203 pretreatment Methods 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000003153 chemical reaction reagent Substances 0.000 title claims description 18
- 239000010440 gypsum Substances 0.000 claims abstract description 50
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 50
- 239000003814 drug Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 21
- 229910021532 Calcite Inorganic materials 0.000 claims abstract description 20
- 235000019738 Limestone Nutrition 0.000 claims abstract description 20
- 239000002223 garnet Substances 0.000 claims abstract description 20
- 239000006028 limestone Substances 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 20
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 16
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 8
- 230000005494 condensation Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 239000011812 mixed powder Substances 0.000 claims description 7
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical group [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 238000000498 ball milling Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical group [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 3
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 150000002505 iron Chemical class 0.000 claims 1
- 239000011259 mixed solution Substances 0.000 claims 1
- 239000010802 sludge Substances 0.000 abstract description 17
- 239000010419 fine particle Substances 0.000 abstract description 10
- 239000008394 flocculating agent Substances 0.000 abstract description 8
- 230000002776 aggregation Effects 0.000 abstract description 7
- 238000004220 aggregation Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 238000005345 coagulation Methods 0.000 abstract description 4
- 230000015271 coagulation Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 2
- 231100000719 pollutant Toxicity 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 13
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 11
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 7
- 238000005119 centrifugation Methods 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- VCSZKSHWUBFOOE-UHFFFAOYSA-N dioxidanium;sulfate Chemical compound O.O.OS(O)(=O)=O VCSZKSHWUBFOOE-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002910 solid waste Substances 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 239000013043 chemical agent Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920006052 Chinlon® Polymers 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 125000001741 organic sulfur group Chemical group 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
- B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Ceramic Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Treating Waste Gases (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a desulfurization wastewater pretreatment medicament, a preparation method, a pretreatment system and a pretreatment method, wherein the medicament comprises calcite, garnet, limestone and ferric chloride, the medicament is in a powder form, and the mass ratio of the calcite to the garnet to the limestone is 4-6:1-3:1-2; the powdery/soluble medicament provided by the invention can provide flocculation nuclei and flocculating agents, provides coagulation sites for the aggregation of fine particles in desulfurization wastewater, realizes the rapid aggregation of the fine particles into large particles, avoids the formation of loose large-particle suspended matters with smaller density by directly adding the flocculating agents, and is beneficial to the rapid removal of the fine particles; according to the desulfurization wastewater pretreatment method provided by the invention, the formed sludge has compact structure and is easy to separate, and after the separated sludge is mixed with gypsum, the quality change of the gypsum is not caused, so that the sludge can be transported outwards after being combined with the gypsum, and new pollutants are not formed.
Description
Technical Field
The invention belongs to the technical field of desulfurization wastewater treatment, and particularly relates to a desulfurization wastewater pretreatment reagent, a preparation method, a pretreatment system and a pretreatment method.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
The desulfurization wastewater is the tail end wastewater of a power plant and is also the wastewater with the greatest treatment difficulty, and the current common desulfurization wastewater treatment process is a triple box process, namely lime, organic sulfur and a flocculating agent are sequentially adopted to treat the desulfurization wastewater, so that indexes such as suspended solids, heavy metals, chromaticity and the like of the desulfurization wastewater are reduced. However, as the content of suspended matters in the desulfurization wastewater is large and is mostly particles with large surface viscosity, blockage often occurs in the three-connecting box, and the normal operation of the three-connecting box is influenced. Thus, it is difficult to obtain a good desulfurization wastewater treatment effect.
Usually, pre-sedimentation is a good way for removing suspended matters in wastewater, but desulfurization wastewater subjected to pre-sedimentation treatment can obtain a certain suspended matter removal rate, but because particles are smaller, the removed particles are easy to return to water again, and the problems of filter screen blockage, frequent replacement and the like are very easy to occur in a subsequent dehydration unit. The continuous centrifugal machine can realize continuous centrifugal treatment of the wastewater, thereby reducing the content of suspended matters in the wastewater. However, the sludge produced by centrifugation still has the problems of difficult dehydration and the like, so that the sludge cannot be combined with gypsum, and new solid waste can be formed. Therefore, how to realize pretreatment of desulfurization wastewater, reduce suspended matters, and avoid forming new solid waste in the process of removing suspended matters at the same time is a problem to be solved in the desulfurization wastewater treatment process.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a desulfurization wastewater pretreatment medicament, a preparation method, a pretreatment system and a pretreatment method, which can greatly reduce the content of suspended matters in desulfurization wastewater, change the morphology of separated sludge, enable the separated sludge to be incorporated into gypsum, and not influence the quality of the gypsum.
Specifically, the invention is realized by the following technical scheme:
In a first aspect of the present invention, there is provided a desulfurization wastewater pretreatment chemical agent, the chemical agent comprising calcite, garnet, limestone and ferric chloride, the chemical agent being in the form of powder, the mass ratio of the calcite, garnet and limestone being 4-6:1-3:1-2.
Further, the ferric chloride is replaced by ferric sulfate or ferric nitrate; preferably, the mass ratio of calcite, garnet and limestone is 5:2:1.
In a second aspect of the present invention, there is provided a method for preparing a desulfurization wastewater pretreatment agent, comprising the steps of:
Firstly, putting calcite, garnet and limestone into ball milling and medium milling according to a proportion, and mixing to form uniformly mixed powder with uniform texture; then adding ferric salt solution into the powder, and stirring the powder into paste; and then the mixture is put into an oven for drying and grinding, and the powdery/soluble medicament is obtained.
Further, calcite, garnet, limestone according to 4-6:1-3:1-2, preferably 5:2:1.
Further, the mass concentration of the ferric salt solution is 0.5-1.5%.
Further, the milled and mixed powder was filtered with a 40 mesh screen to remove large particles from the powder.
In a third aspect of the invention, a desulfurization wastewater pretreatment system comprises a dosing tank, wherein a medicament is placed in the dosing tank, the dosing tank is connected to a desulfurization wastewater pipeline, and a pipeline mixer is arranged on the desulfurization wastewater pipeline and is used for mixing the medicament and desulfurization wastewater; the desulfurization waste water pipeline is connected with a continuous centrifugal machine, and a liquid outlet of the continuous centrifugal machine is connected with the triple box.
Further, a metering pump is arranged at the outlet of the dosing box, and a filter material outlet of the continuous centrifugal machine is connected with a vacuum belt conveyor.
In a fourth aspect of the present invention, there is provided a desulfurization wastewater pretreatment method, wherein a chemical is added to a desulfurization wastewater pipe, the chemical and desulfurization wastewater are sufficiently mixed in a pipe mixer, the mixture is introduced into a continuous centrifuge for centrifugal treatment, the centrifugally filtered liquid is introduced into a triple tank for subsequent treatment, and further, the obtained filter material is introduced into a vacuum belt conveyor for treatment, thereby forming dehydrated gypsum.
Further, the added mass of the agent is 0.5-1% of the mass of the desulfurization wastewater.
One or more embodiments of the invention have the following beneficial effects:
(1) The powdery/soluble medicament provided by the invention can provide flocculation nuclei and flocculating agents, provides coagulation sites for the aggregation of fine particles in desulfurization wastewater, realizes the rapid aggregation of the fine particles into large particles, avoids the formation of loose large-particle suspended matters with smaller density by directly adding the flocculating agents, and is beneficial to the rapid removal of the fine particles;
(2) The powdery/soluble medicament provided by the invention has the advantages that no special medicine is needed in the preparation process, the purity and the range of the medicament can be selected to be wider, and the preparation process has no harsh conditions, so that the desulfurization wastewater treatment process is easy to realize.
(3) The desulfurization wastewater pretreatment system provided by the invention has a simple structure, is easy to realize, and has better suspended matter removal effect compared with the existing sedimentation tank or continuous centrifuge.
(4) According to the desulfurization wastewater pretreatment method provided by the invention, the continuous centrifugal machine is adopted to separate suspended matters, and the rotating speed of the continuous centrifugal machine is only required to be maintained at about 1500rpm, so that the probability of failure of centrifugal machine equipment is reduced, and the stability of the desulfurization wastewater pretreatment process is ensured.
(5) According to the desulfurization wastewater pretreatment method provided by the invention, small particles in desulfurization wastewater are firstly converted into compact large particles, then suspended matters are rapidly removed through a low-speed continuous centrifugal process, the treatment process is efficient, the stable operation of the subsequent triple box treatment process is ensured, and the condition that the desulfurization wastewater cannot be continuously treated due to the fact that the operation period of the triple box treatment process is short due to the fact that the sludge amount is too large is avoided.
(6) According to the desulfurization wastewater pretreatment method provided by the invention, the formed sludge has compact structure and is easy to separate, and after the separated sludge is mixed with gypsum, the quality change of the gypsum is not caused, so that the sludge can be transported outwards after being combined with the gypsum, and new pollutants are not formed.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. Embodiments of the present invention are described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of a desulfurization wastewater pretreatment system of the present invention;
Wherein, 1a dosing tank, 2 a continuous centrifuge, 3 a desulfurization waste water, 4a delivery pump, 5a metering pump, 6a pipeline mixer, 7a three-connecting tank and 8 a vacuum belt conveyor.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. The experimental procedures, which do not address the specific conditions in the examples below, are generally carried out under conventional conditions or under conditions recommended by the manufacturer.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the prior art, a pre-sedimentation mode is generally adopted to remove rated suspended matters in the desulfurization wastewater, and the desulfurization wastewater subjected to the pre-sedimentation treatment can obtain a certain suspended matter removal rate, but because the particles are smaller, the removed particles are easy to return to water again, and the problems of filter screen blockage, frequent replacement and the like are very easy to occur in a subsequent dehydration unit. The continuous centrifugal machine can realize continuous centrifugal treatment of the wastewater, thereby reducing the content of suspended matters in the wastewater. However, the sludge produced by centrifugation still has the problems of difficult dehydration and the like, so that the sludge cannot be combined with gypsum, and new solid waste can be formed.
Therefore, the pretreatment agent, the preparation method, the pretreatment system and the pretreatment method for the desulfurization wastewater can continuously and stably reduce the content of suspended matters in the desulfurization wastewater to a large extent, firstly, fine particles in the desulfurization wastewater are subjected to preliminary agglomeration by adding the powdery/soluble agent to reduce the water content of a mud cake formed after centrifugation, then, solid-liquid separation is carried out by continuous centrifugation, the separated solid-phase substances are incorporated into gypsum, the quality of the gypsum is not influenced, and the water phase is led into a subsequent triple box for treatment, so that the efficient, stable and continuous treatment of the desulfurization wastewater is realized. The powdery/soluble medicament can realize that small particles in desulfurization wastewater are quickly transformed into compact large particles, and after the transformed particles are combined with gypsum, the quality of the gypsum is not affected, so that new solid waste is avoided.
In one or more embodiments of the present invention, there is provided a desulfurization wastewater pretreatment agent, wherein the agent comprises calcite, garnet, limestone and ferric chloride, the agent is in powder form, and the mass ratio of the calcite, garnet and limestone is 4-6:1-3:1-2, preferably 5:2:1. the stronger the attraction between the condensation nucleus and the substance to be coagulated, the better the coagulation effect, the more critical factors of the separation process are the affinity, density and mechanical strength of the condensation nucleus, the better the affinity between the calcite, garnet and limestone and calcium sulfate are adopted, the calcite can increase the micro-pore of the condensation nucleus, the garnet can increase the density and mechanical strength of the condensation nucleus, the limestone can regulate the surface charge of the condensation nucleus, and meanwhile, the ferric chloride is used as an adhesive, thereby being beneficial to the full mixing of powder.
The desulfurization wastewater pretreatment agent provided by the embodiment can be used as flocculation cores and flocculating agents, provides coagulation sites for the aggregation of fine particles in desulfurization wastewater, realizes the rapid aggregation of the fine particles into large particles, avoids the formation of loose large-particle suspended matters with smaller density due to the direct addition of the flocculating agents, and is beneficial to the rapid removal of the fine particles.
In one or more embodiments of the present invention, there is provided a method for preparing a desulfurization wastewater pretreatment agent, first, calcite, garnet, limestone are mixed according to 4-6:1-3:1-2, and then forming uniformly mixed powder with uniform texture by ball milling and medium milling, and then filtering by a 40-mesh filter screen, wherein the powder with the size smaller than 40 meshes is selected to avoid damage to continuous centrifugation caused by oversized particles; adding ferric chloride solution with the ferric chloride mass ratio of 0.5-1.5% into the powder, wherein the concentration of ferric chloride cannot be too high, otherwise, the quality of gypsum is affected, and stirring the powder into paste; and then the mixture is put into an oven for drying and grinding, and the powdery/soluble medicament is obtained.
Further, the mass ratio of the calcite, garnet and limestone to be ground and mixed is preferably 5:2:1.
In the embodiment, the mass ratio of the added amount of the ferric chloride to the mixed powder is 1-1.5:1 to ensure that the powder is stirred into a paste.
The ferric chloride solution in this example can also be replaced by other soluble ferric salts, such as ferric sulfate, ferric nitrate, etc., which can act as flocculants.
In one or more embodiments of the present invention, as shown in fig. 1, there is provided a desulfurization wastewater pretreatment system, comprising a dosing tank 1, a reagent is placed in the dosing tank 1, a metering pump 5 is provided at an outlet of the dosing tank 1 for controlling an addition amount of the reagent, the dosing tank 1 is connected to a pipe for desulfurization wastewater, and a pipe mixer 6 is provided at a desulfurization wastewater pipe for sufficiently mixing the reagent and desulfurization wastewater; the desulfurization waste water pipeline is connected with a continuous centrifugal machine 2, the continuous centrifugal machine filters and separates the mixture in the medicament and desulfurization waste water under the action of centrifugal force, the continuous centrifugal machine can operate at a low rotating speed, the rotating speed of the centrifugal machine is 1400-1600rpm, the removal of suspended matters in the desulfurization waste water is realized, a liquid outlet of the continuous centrifugal machine 2 is connected with a triple box 7, and the filtered desulfurization waste water is sent into the triple box for subsequent treatment; the filter material outlet of the continuous centrifuge 2 is connected with a vacuum belt conveyor 8, the filter material is a mixture of sludge and water, and the filter material and gypsum slurry of the vacuum belt conveyor are combined to form dehydrated gypsum.
A conveying pump 4 is arranged on a pipeline of the desulfurization wastewater and is used for conveying the desulfurization wastewater 3; the feeding pump 4 and the metering pump 5 are controlled in a linkage way, the adding quality of the medicament is controlled to be 0.5-1% of the quality of the desulfurization wastewater, and the medicament cannot be added too much, so that on one hand, the formed floccule is small in particle size due to the fact that the adding of the medicament is too much, continuous separation is not easy in the centrifugation process, on the other hand, the purity of gypsum is affected due to the fact that the adding of the medicament is too much, and meanwhile, in order to ensure the sufficient mixing of the medicament and the desulfurization wastewater, the distance between a dosing point and an inlet of a continuous centrifugal machine is required to be larger than 12m.
In one or more embodiments of the present invention, there is provided a desulfurization wastewater pretreatment method: adding the reagent into a desulfurization wastewater pipeline, fully mixing the reagent and desulfurization wastewater in a pipeline type mixer, feeding the mixed reagent and desulfurization wastewater into a continuous centrifuge for centrifugal treatment, feeding the centrifugally filtered liquid into a three-header for subsequent treatment, and further, introducing the obtained filter material into a vacuum belt conveyor for treatment to form dehydrated gypsum.
The invention will now be described in further detail with reference to the following specific examples, which should be construed as illustrative rather than limiting.
Example 1
A desulfurization wastewater pretreatment medicament comprises calcite, garnet, limestone and ferric chloride, wherein the medicament is in a powder form;
the preparation method comprises the following steps:
Calcite, garnet and limestone are mixed according to the mass ratio of 5:2:1, putting the powder into a ball mill, grinding while mixing, filtering the ground powder by using a 40-mesh filter screen, and selecting small and 40-mesh powder. Adding 1% ferric chloride solution into the powder until the mixed powder is stirred into paste, and then putting the paste into an oven for drying and grinding to obtain the powdery/soluble medicament.
The desulfurization wastewater of the Huaneng Jining power plant is taken as a treatment object, a reagent is added into a desulfurization wastewater pipeline, the addition amount of the reagent is 0.7% of the desulfurization wastewater amount, a reagent adding point is arranged at a position 15m away from an inlet of a continuous centrifugal machine, and the rotating speed of the continuous centrifugal machine is set to 1500rpm.
The content of suspended matters in the desulfurization wastewater which is not pretreated and the desulfurization wastewater at the outlet of the continuous centrifuge in the embodiment 1 are detected, the operation period of the triple box is recorded, three main indexes of the chloride ion content, the attached water content and the calcium sulfate dihydrate content of gypsum are detected, and the analysis data are shown in the table 1.
TABLE 1
| Detecting items | Pretreatment of | No pretreatment |
| Suspension of | 0.23％ | 4.9％ |
| Three-header run cycle | For 80 days | 25 Days |
| Gypsum chloride ion content | 165ppm | 168ppm |
| Gypsum water content | 8.5％ | 8.2％ |
| Gypsum dihydrate sulfate content | 93.5％ | 93.7％ |
Example 2
The difference from example 1 is that the desulfurization waste water of the Populus chinensis river power plant is treated, and a chemical is added to the desulfurization waste water pipe in an amount of 0.6% of the desulfurization waste water amount.
The content of suspended matters in the desulfurization wastewater which is not pretreated and the desulfurization wastewater at the outlet of the continuous centrifuge in the embodiment 2 are detected, the operation period of the triple box is recorded, three main indexes of the chloride ion content, the attached water content and the calcium sulfate dihydrate content of gypsum are detected, and the analysis data are shown in the table 2.
TABLE 2
| Detecting items | Pretreatment of | No pretreatment |
| Suspension of | 0.21％ | 4.5％ |
| Three-header run cycle | For 80 days | 25 Days |
| Gypsum chloride ion content | 180ppm | 176ppm |
| Gypsum water content | 8.1％ | 8.2％ |
| Gypsum dihydrate sulfate content | 91.5％ | 91.7％ |
Example 3
The difference from example 1 is that the desulfurization waste water of the loin power plant was treated, and a chemical was added to the desulfurization waste water pipe in an amount of 0.8% of the amount of desulfurization waste water.
The content of suspended matters in the desulfurization wastewater which is not pretreated and the desulfurization wastewater at the outlet of the continuous centrifuge in the embodiment 3 are detected, the operation period of the triple box is recorded, three main indexes of the chloride ion content, the attached water content and the calcium sulfate dihydrate content of gypsum are detected, and the analysis data are shown in the table 3.
TABLE 3 Table 3
| Detecting items | Pretreatment of | No pretreatment |
| Suspension of | 0.15％ | 4.1％ |
| Three-header run cycle | For 70 days | 25 Days |
| Gypsum chloride ion content | 155ppm | 151ppm |
| Gypsum water content | 9.2％ | 9.2％ |
| Gypsum dihydrate sulfate content | 94.2％ | 94.4％ |
Example 4
The difference from example 1 is that a chemical was added to the desulfurization waste water pipe in an amount of 0.9% of the amount of desulfurization waste water, and the rotational speed of the continuous centrifuge was 1600rpm.
The content of suspended matters in the desulfurization wastewater which is not pretreated and the desulfurization wastewater at the outlet of the continuous centrifuge in the embodiment 4 are detected, the operation period of the triple box is recorded, three main indexes of the chloride ion content, the attached water content and the calcium sulfate dihydrate content of gypsum are detected, and the analysis data are shown in the table 4.
TABLE 4 Table 4
| Detecting items | Pretreatment of | No pretreatment |
| Suspension of | 0.13％ | 3.5％ |
| Three-header run cycle | For 80 days | For 30 days |
| Gypsum chloride ion content | 165ppm | 158ppm |
| Gypsum water content | 8.5％ | 8.2％ |
| Gypsum dihydrate sulfate content | 95.5％ | 95.2％ |
Example 5
The difference from example 1 is that the desulfurization waste water of the heat power plant of chinlon Liaocheng is used as the treatment object, and the chemical is added into the desulfurization waste water pipe, and the addition amount of the chemical is 1% of the desulfurization waste water amount.
The content of suspended matters in the desulfurization wastewater which is not pretreated and the desulfurization wastewater at the outlet of the continuous centrifuge in the embodiment 5 are detected, the operation period of the triple box is recorded, three main indexes of the chloride ion content, the attached water content and the calcium sulfate dihydrate content of gypsum are detected, and the analysis data are shown in the table 5.
TABLE 5
| Detecting items | Pretreatment of | No pretreatment |
| Suspension of | 0.28％ | 4.5％ |
| Three-header run cycle | For 70 days | For 30 days |
| Gypsum chloride ion content | 165ppm | 168ppm |
| Gypsum water content | 8.5％ | 8.2％ |
| Gypsum dihydrate sulfate content | 93.5％ | 93.5％ |
Comparative example 1
The difference from example 1 is that common flocculant is added into desulfurization waste water, desulfurization waste water of the Huanening power plant is pretreated, the suspended matter content in the treated desulfurization waste water is 3.2%, and the triple box operation period is 35 days.
Comparative example 2
The difference from example 1 is that the desulfurization waste water of the Huanening power plant is pretreated by adopting a common pre-sedimentation mode, the content of suspended matters in the treated desulfurization waste water is 3.1 percent, and the operation period of the triple box is 40 days.
Comparative example 3
The difference from example 1 is that the desulfurization waste water of the Huanening power plant is pretreated by adopting a continuous centrifuge without adding any medicament, the content of suspended matters in the treated desulfurization waste water is 2.8%, and the triple box is operated for 30 days.
By analyzing all the data of pretreatment and no pretreatment in the embodiments 1-5, the pretreatment method has a good pretreatment effect on the pretreatment of the desulfurization wastewater of a plurality of power plants, can effectively reduce suspended matters in the desulfurization wastewater, avoid the suspended matters from blocking when the wastewater is treated by the triple box, increase the operation period of the triple box, and improve the operation stability of the triple box.
Meanwhile, the sediment generated by pretreatment can be integrated into the desulfurized gypsum through detecting the component content in the pretreated gypsum and the gypsum without pretreatment, so that the components and the performance of the gypsum are not affected, and the formation of new solid waste in the pretreatment process is avoided; after the sludge is mixed, the main reason for influencing the quality of the gypsum is that the excessive moisture and chloride ions are mixed in the mixed sludge, so that the gypsum is difficult to remove impurities such as the moisture and the like when passing through a vacuum belt conveyor, the existing flocculant contains more chloride ions, the sludge generated by the removed suspended matters can influence the quality of the gypsum, the components of the existing flocculant are changed by the agent provided by the invention, and the content of the chloride ions is very small, so that the quality of the gypsum cannot be influenced by the mixed gypsum.
As can be seen from comparative analysis of the examples and the comparative examples, compared with the existing flocculant, the flocculant provided by the invention has a better precipitation effect, can effectively reduce suspended matters in desulfurization wastewater, avoids the suspended matters from blocking when the wastewater is treated by the triple box, increases the operation period of the triple box, and improves the operation stability of the triple box.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The desulfurization wastewater pretreatment medicament is characterized by comprising calcite, garnet, limestone and ferric chloride, wherein the medicament is in a powder form, and the mass ratio of the calcite to the garnet to the limestone is 4-6:1-3:1-2;
The ferric chloride is ferric chloride solution with the mass concentration of 0.5-1.5%;
Calcite increases the micro-pore channel of the condensation nucleus, garnet increases the density and mechanical strength of the condensation nucleus, and limestone adjusts the surface charge of the condensation nucleus;
the preparation method of the desulfurization wastewater pretreatment agent comprises the following steps:
firstly, putting calcite, garnet and limestone into ball milling and medium milling according to a proportion, and mixing to form uniformly mixed powder with uniform texture; then adding ferric salt solution into the powder, and stirring the powder into paste; and then putting the powder into an oven for drying and grinding to obtain the powdery medicament.
2. The desulfurization wastewater pretreatment reagent according to claim 1, wherein the ferric chloride is replaced with ferric sulfate or ferric nitrate.
3. The desulfurization wastewater pretreatment chemical according to claim 1, wherein the mass ratio of calcite, garnet and limestone is 5:2:1.
4. The desulfurization wastewater pretreatment reagent according to claim 1, wherein the mass concentration of the iron salt solution is 0.5 to 1.5%.
5. The desulfurization wastewater pretreatment agent according to claim 1, wherein the milled and mixed powder is filtered with a 40-mesh screen to remove large particles in the powder.
6. A desulfurization wastewater pretreatment system, which is characterized by comprising a dosing tank, wherein the reagent according to claim 1 is placed in the dosing tank, the dosing tank is connected to a desulfurization wastewater pipeline, and a pipeline mixer is arranged on the desulfurization wastewater pipeline and is used for mixing the reagent and the desulfurization wastewater; the desulfurization waste water pipeline is connected with a continuous centrifugal machine, and a liquid outlet of the continuous centrifugal machine is connected with the triple box.
7. The desulfurization wastewater pretreatment system according to claim 6, wherein a metering pump is arranged at an outlet of the dosing tank, and a filter material outlet of the continuous centrifuge is connected with a vacuum belt conveyor.
8. The desulfurization wastewater pretreatment method is realized by adopting the desulfurization wastewater pretreatment system as claimed in claim 6 or 7, and is characterized in that a reagent is added into a desulfurization wastewater pipeline, the reagent and desulfurization wastewater are fully mixed in a pipeline mixer, the mixed solution enters a continuous centrifuge for centrifugal treatment, the liquid after centrifugal filtration enters a three-header for subsequent treatment, and further, the obtained filter material is introduced into a vacuum belt conveyor for treatment, so that dehydrated gypsum is formed.
9. The desulfurization wastewater pretreatment method as claimed in claim 8, wherein the agent is added in an amount of 0.5 to 1% by mass of the desulfurization wastewater.
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