CN117923724B - Sulfate wastewater treatment system and method - Google Patents
Sulfate wastewater treatment system and method Download PDFInfo
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- CN117923724B CN117923724B CN202410272725.XA CN202410272725A CN117923724B CN 117923724 B CN117923724 B CN 117923724B CN 202410272725 A CN202410272725 A CN 202410272725A CN 117923724 B CN117923724 B CN 117923724B
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- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 67
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 124
- 238000004062 sedimentation Methods 0.000 claims abstract description 94
- 239000010802 sludge Substances 0.000 claims abstract description 69
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000004571 lime Substances 0.000 claims abstract description 34
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 33
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000843 powder Substances 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 239000002351 wastewater Substances 0.000 claims description 60
- 239000013049 sediment Substances 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 25
- 239000002253 acid Substances 0.000 claims description 20
- 238000006297 dehydration reaction Methods 0.000 claims description 20
- 230000018044 dehydration Effects 0.000 claims description 19
- 239000002244 precipitate Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000001556 precipitation Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 4
- 230000029219 regulation of pH Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 13
- 239000000126 substance Substances 0.000 abstract description 10
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 9
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 9
- 238000004090 dissolution Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 238000006757 chemical reactions by type Methods 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002002 slurry Substances 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a sulfate radical wastewater treatment system and a sulfate radical wastewater treatment method, and relates to the technical field of water treatment. The invention provides a sulfate wastewater treatment system which comprises a collecting tank, a first reaction tank, a first sedimentation tank, a second reaction tank, a second sedimentation tank, a pH regulating tank, a first sludge concentration tank, a second sludge concentration tank and a dewatering device. Lime is added in a powder particle form in the treatment system, and no more water is introduced, so that a large amount of water resources are saved; the hydrogen peroxide adding device is arranged, hydrogen peroxide is added while lime is dissolved, and adverse effects of oxides and organic matters formed on the surface layer of the particles on further dissolution of the particles and release of calcium ions during lime dissolution are eliminated; the chemical equilibrium reaction type high-concentration chemical substance is utilized to promote the reaction direction, the concentration difference change of two-stage sulfate radical and calcium ions is fully utilized, and the sulfate radical is removed and the lime is utilized efficiently.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a sulfate radical wastewater treatment system and a sulfate radical wastewater treatment method.
Background
In the industrial production process, a large amount of high-concentration sulfate wastewater is discharged, and if the high-concentration sulfate in the wastewater cannot be effectively removed, the direct reuse of reclaimed water cannot be realized, so that the resource waste is caused; and the high concentration sulfate radical in the wastewater can generate a large amount of hydrogen sulfide to inhibit biochemical reaction, so that a biochemical system is crashed in the subsequent wastewater treatment.
The current method for sulfate wastewater treatment is as follows:
In the traditional lime neutralization method, lime slurry is adopted, and because the solubility of lime is very small, the concentration is 5-10%, and a large amount of lime slurry is added to reduce sulfate by about 10%, so that the removal rate is low, and the concentration of calcium ions is greatly increased.
The ion exchange method is used for removing sulfate ions in the wastewater, and the sulfate ions are exchanged with other ions on the resin. However, this method is only suitable for sulfate wastewater with low concentration, and when treating sulfate wastewater with high concentration, resin regeneration is too frequent, and a large amount of acid-base regeneration wastewater is generated.
In the biological method, microorganisms are utilized to degrade or convert sulfate ions in the wastewater, and sulfate is converted into sulfide or other harmless substances. However, if the sulfide concentration is large, the activity of microorganisms is inhibited, so that the method is only applicable to the treatment of sulfate wastewater with low concentration.
In view of this, the present invention has been made.
Disclosure of Invention
A first object of the present invention is to provide a sulfate wastewater treatment system to solve the sulfate wastewater treatment problem.
A second object of the present invention is to provide the use of the above-described sulfate wastewater treatment system in sulfate wastewater treatment.
The third object of the invention is to provide a method for treating sulfate wastewater.
In order to achieve the above object, the following technical scheme is adopted:
First, the in one aspect of the present invention, the invention provides a sulfate radical wastewater treatment system, comprises a collecting tank, a first reaction tank, a first sedimentation tank, a second reaction tank, a second sedimentation tank the system comprises a pH adjusting tank, a first sludge concentration tank, a second sludge concentration tank and a dehydration device;
The collecting tank is communicated with the first reaction tank and is used for conveying the collected sulfate wastewater to the first reaction tank;
The first reaction tank is communicated with the first sludge concentration tank and is used for carrying out a mixing reaction on excessive sulfate wastewater and the precipitate concentrated by the first sludge concentration tank;
the first sedimentation tank is respectively communicated with the first reaction tank and the second reaction tank and is used for sedimentation of wastewater from the reaction of the first reaction tank and transportation of clear liquid to the second reaction tank;
The second reaction tank is provided with a lime powder adding device and a hydrogen peroxide adding device, and is used for carrying out mixed reaction on clear liquid from the first sedimentation tank, the added hydrogen peroxide and excessive lime powder;
The second sedimentation tank is respectively communicated with the second reaction tank and the pH adjusting tank and is used for settling the wastewater from the second reaction tank after reaction and transporting clear liquid to the pH adjusting tank;
The pH adjusting tank is used for adjusting the pH of the clear liquid from the second sedimentation tank to obtain produced water;
The first sludge concentration tank is respectively communicated with the second sedimentation tank, the first reaction tank and the collecting tank and is used for concentrating sediment from the second sedimentation tank, transporting the concentrated sediment to the first reaction tank and transporting clear liquid to the collecting tank;
the second sludge concentration tank is respectively communicated with the first sedimentation tank and the dehydration device and is used for concentrating sediment from the first sedimentation tank, transporting the concentrated sediment to the dehydration device and transporting clear liquid to the collection tank;
the dehydration device is used for dehydrating the precipitate concentrated by the second sludge concentration tank.
As a further technical scheme, the collecting tank is provided with a lift pump for pumping sulfate wastewater of the collecting tank into the first reaction tank.
As a further technical scheme, the first reaction tank is provided with a stirring device and an ultrasonic releaser;
the second reaction tank is provided with a stirring device and an ultrasonic releaser.
As a further technical scheme, the first sedimentation tank comprises an inclined plate sedimentation tank;
the second sedimentation tank comprises an inclined plate sedimentation tank.
As a further technical scheme, the pH adjusting tank is provided with a stirring device, a pH meter and an acid adding device.
As a further technical scheme, the acid adding device is communicated with a pH adjusting tank pipeline, and a valve is arranged on the pipeline;
the valve is interlocked with the pH meter, and the adding rate of the acid is regulated according to the measured value of the pH meter, so that the pH value of water in the pH regulating tank reaches a set value.
As a further technical scheme, the acid added by the acid adding device comprises hydrochloric acid.
As a further technical scheme, the sludge treatment device also comprises a first sludge pump and a second sludge pump;
The first sludge pump is used for conveying the precipitate concentrated by the first sludge concentration tank to the first reaction tank;
The second sludge pump is used for conveying the sediment concentrated by the second sludge concentration tank to the dewatering device.
In a second aspect, the invention provides the use of the sulfate wastewater treatment system described above in sulfate wastewater treatment.
In a third aspect, the invention provides a method for treating sulfate wastewater, based on the sulfate wastewater treatment system, comprising the following steps:
Transporting excessive sulfate wastewater from a collecting tank to a first reaction tank, and carrying out mixed reaction with a precipitate which is derived from the concentration of a first sludge concentration tank in the first reaction tank; the reacted wastewater enters a first sedimentation tank for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a second reaction tank to carry out a mixing reaction with the added hydrogen peroxide and excessive lime powder; the reacted wastewater enters a second sedimentation tank for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a pH regulating tank for pH regulation to obtain produced water;
The sediment obtained after the sedimentation treatment in the second sedimentation tank enters a first sludge concentration tank for concentration, the concentrated sediment is transported to a first reaction tank for mixed reaction with sulfate wastewater, and concentrated clear liquid is transported to a collecting tank;
and (3) enabling the sediment obtained after the sediment treatment in the first sedimentation tank to enter a second sludge concentration tank for concentration, conveying the concentrated sediment to a dehydration device for dehydration, and conveying concentrated clear liquid to a collection tank.
Compared with the prior art, the sulfate wastewater treatment system provided by the invention has the following beneficial effects:
According to the invention, lime is added in a powder particle form, so that no more water is introduced, and a large amount of water resources are saved.
According to the invention, hydrogen peroxide is added while lime is dissolved, and the adverse effects of oxides and organic matters formed on the surface layer of the particles on further dissolution of the particles and release of calcium ions during lime dissolution are eliminated by utilizing a local acidic environment and high-oxidability hydroxyl radical molecules formed by decomposition of the hydrogen peroxide.
The invention utilizes the promotion of chemical equilibrium reaction type high-concentration chemical substances to the reaction direction, fully utilizes the concentration difference change of two-stage sulfate radicals and calcium ions, promotes the formation of calcium sulfate substances in a first reaction tank and a second reaction tank respectively, and realizes the removal of sulfate radicals and the efficient utilization of lime.
Furthermore, the stirring device and the ultrasonic releaser are arranged in the reaction tank, so that lime particles can be made to run in a nano and high-frequency molecular mode, and fully contact and react with sulfate ions in water, and the utilization efficiency of the medicament and the removal efficiency of sulfate radicals are greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a sulfate wastewater treatment system provided in example 1 of the present invention.
Icon: 1-a collecting tank; 11-a lift pump; 2-a first reaction tank; 21-a first stirring paddle; 22-an ultrasonic releaser; 3-a first sedimentation tank; 4-a second reaction tank; 41-lime powder adding device; 42-hydrogen peroxide adding device; 43-a second stirring paddle; 5-a second sedimentation tank; 6-a pH adjusting tank; 61-acid adding device; 62-pH meter; 63-a third stirring paddle; 64-valve; 7-a first sludge concentration tank; 71-a first sludge pump; 8-a second sludge concentration tank; 81-a second sludge pump; 9-dehydration device.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to embodiments and examples, but it will be understood by those skilled in the art that the following embodiments and examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not specified, and the process is carried out according to conventional conditions or conditions suggested by manufacturers. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
First, the in one aspect of the present invention, the invention provides a sulfate radical wastewater treatment system, comprises a collecting tank, a first reaction tank, a first sedimentation tank, a second reaction tank, a second sedimentation tank the system comprises a pH adjusting tank, a first sludge concentration tank, a second sludge concentration tank and a dehydration device;
The collecting tank is communicated with the first reaction tank and is used for conveying the collected sulfate wastewater to the first reaction tank;
The first reaction tank is communicated with the first sludge concentration tank and is used for carrying out mixed reaction on excessive sulfate wastewater and the precipitate concentrated by the first sludge concentration tank, and the chemical equilibrium formula is as follows:
the first sedimentation tank is respectively communicated with the first reaction tank and the second reaction tank and is used for sedimentation of wastewater from the reaction of the first reaction tank and transportation of clear liquid to the second reaction tank;
The second reaction tank is provided with a lime powder adding device and a hydrogen peroxide solution adding device, and is used for carrying out mixed reaction on clear solution from the first sedimentation tank, the added hydrogen peroxide solution and excessive lime powder, wherein the chemical equilibrium formula is as follows:
The second sedimentation tank is respectively communicated with the second reaction tank and the pH adjusting tank and is used for settling the wastewater from the second reaction tank after reaction and transporting clear liquid to the pH adjusting tank;
The pH adjusting tank is used for adjusting the pH of the clear liquid from the second sedimentation tank to obtain produced water;
The first sludge concentration tank is respectively communicated with the second sedimentation tank, the first reaction tank and the collecting tank and is used for concentrating sediment from the second sedimentation tank, transporting the concentrated sediment to the first reaction tank and transporting clear liquid to the collecting tank;
the second sludge concentration tank is respectively communicated with the first sedimentation tank and the dehydration device and is used for concentrating sediment from the first sedimentation tank, transporting the concentrated sediment to the dehydration device and transporting clear liquid to the collection tank;
the dehydration device is used for dehydrating the precipitate concentrated by the second sludge concentration tank.
The inventor researches show that as the lime powder particles have impurities such as partial indissolvable oxidized matters, organic matters and the like on the surfaces of the particles when the lime powder particles are dissolved in water, the substances prevent the lime powder particles from being thoroughly dissolved and calcium ions from being effectively released, the added hydrogen peroxide is decomposed in the water to form local acidic environment and high-oxidability hydroxyl radical molecules, and under the action of the two factors, the influence of indissolvable oxidized matters and organic matters on the surfaces of the lime particles on the thorough dissolution of the lime powder particles and the release of the calcium ions can be effectively eliminated and activated.
The sulfate wastewater treatment system provided by the invention has a simple structure, can effectively treat sulfate wastewater, and is particularly suitable for treating high-concentration sulfate wastewater.
In some alternative embodiments, the collection tank is provided with a lift pump for pumping sulfate waste water from the collection tank to the first reaction tank.
In some alternative embodiments, the first reaction tank is provided with a stirring device and an ultrasonic releaser;
the second reaction tank is provided with a stirring device and an ultrasonic releaser.
The stirring device comprises a stirring paddle which is used for stirring the wastewater in the reaction tank, and the stirring rotating speed of the stirring paddle can be 10000r/min; the ultrasonic releaser is used for carrying out ultrasonic treatment on the wastewater in the reactor. Through the high-speed shearing action of the stirring device, sulfate radical wastewater is effectively contacted with unreacted calcium ion substances in the slurry, and then under the action of an ultrasonic releaser, water molecules and unreacted calcium hydroxide subjected to high-speed shearing micronization are subjected to high-frequency molecular motion, so that the effective contact of sulfate radical and unreacted calcium ions is further promoted.
In some alternative embodiments, the first sedimentation tank includes, but is not limited to, a swash plate sedimentation tank;
The second sedimentation tank includes, but is not limited to, an inclined plate sedimentation tank.
In some alternative embodiments, the pH adjusting tank is provided with a stirring device, a pH meter, and an acid addition device.
Wherein the stirring device comprises a stirring paddle which is used for stirring the water in the pH adjusting tank;
the pH meter is used for measuring the pH of the water in the pH adjusting tank;
the acid adding device is used for adding acid into the pH adjusting tank.
In some optional embodiments, the acid adding device is communicated with a pH adjusting tank pipeline, and a valve is arranged on the pipeline;
the valve is interlocked with the pH meter, and the adding rate of the acid is regulated according to the measured value of the pH meter, so that the pH value of water in the pH regulating tank reaches a set value.
The present invention is not particularly limited to the set value, and may be selected as needed.
In some alternative embodiments, the acid added by the acid adding device includes, but is not limited to, hydrochloric acid.
In some alternative embodiments, the method further comprises a first sludge pump and a second sludge pump;
The first sludge pump is used for conveying the precipitate concentrated by the first sludge concentration tank to the first reaction tank;
The second sludge pump is used for conveying the sediment concentrated by the second sludge concentration tank to the dewatering device.
In a second aspect, the invention provides the use of the sulfate wastewater treatment system described above in sulfate wastewater treatment.
The sulfate radical wastewater treatment system provided by the invention can effectively remove sulfate radical in wastewater, so that the sulfate radical wastewater treatment system can be used for treating sulfate radical wastewater.
In a third aspect, the invention provides a method for treating sulfate wastewater, based on the sulfate wastewater treatment system, comprising the following steps:
Transporting excessive sulfate wastewater from a collecting tank to a first reaction tank, and carrying out mixed reaction with a precipitate which is derived from the concentration of a first sludge concentration tank in the first reaction tank; the reacted wastewater enters a first sedimentation tank for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a second reaction tank to carry out a mixing reaction with the added hydrogen peroxide and excessive lime powder; the reacted wastewater enters a second sedimentation tank for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a pH regulating tank for pH regulation to obtain produced water;
The sediment obtained after the sedimentation treatment in the second sedimentation tank enters a first sludge concentration tank for concentration, the concentrated sediment is transported to a first reaction tank for mixed reaction with sulfate wastewater, and concentrated clear liquid is transported to a collecting tank;
and (3) enabling the sediment obtained after the sediment treatment in the first sedimentation tank to enter a second sludge concentration tank for concentration, conveying the concentrated sediment to a dehydration device for dehydration, and conveying concentrated clear liquid to a collection tank.
The treatment method is simple to operate, and can effectively remove sulfate radicals in wastewater, especially wastewater with high sulfate radical concentration.
The invention is further illustrated by the following specific examples and comparative examples, but it should be understood that these examples are for the purpose of illustration only and are not to be construed as limiting the invention in any way.
Example 1
A sulfate wastewater treatment system, as shown in fig. 1, comprises a collecting tank 1, a first reaction tank 2, a first sedimentation tank 3, a second reaction tank 4, a second sedimentation tank 5, a pH adjusting tank 6, a first sludge concentration tank 7, a second sludge concentration tank 8, a dewatering device 9, a first sludge pump 71 and a second sludge pump 81;
The collecting tank 1 is provided with a lift pump 11 for pumping sulfate waste water of the collecting tank 1 into the first reaction tank 2;
the first reaction tank 2 is communicated with the first sludge concentration tank 7 and is used for carrying out a mixing reaction on excessive sulfate wastewater and the precipitate concentrated by the first sludge concentration tank 7; a first stirring paddle 21 and an ultrasonic releaser 22 are arranged in the first reaction tank 2;
The first sedimentation tank 3 is respectively communicated with the first reaction tank 2 and the second reaction tank 4, and is used for settling the wastewater from the reaction of the first reaction tank 2 and transporting clear liquid to the second reaction tank 4; in this embodiment, the first sedimentation tank 3 is an inclined plate sedimentation tank;
the second reaction tank 4 is provided with a lime powder adding device 41, a hydrogen peroxide solution adding device 42, a second stirring paddle 43 and an ultrasonic releaser 22, and is used for carrying out a mixing reaction on the clear solution from the first sedimentation tank 3, the added hydrogen peroxide solution and excessive lime powder;
the second sedimentation tank 5 is respectively communicated with the second reaction tank 4 and the pH adjusting tank 6, and is used for settling the wastewater from the reaction of the second reaction tank 4 and transporting clear liquid to the pH adjusting tank 6; in this embodiment, the second sedimentation tank 5 is an inclined plate sedimentation tank;
The pH adjusting tank 6 is provided with a third stirring paddle 63, a pH meter 62 and an acid adding device 61, and is used for adjusting the pH of the clear liquid from the second sedimentation tank 5 to obtain produced water; wherein, the acid adding device 61 is communicated with the pH adjusting tank 6 through a pipeline, and a valve 64 is arranged on the pipeline; the valve 64 is interlocked with the pH meter 62, and regulates the feeding rate of hydrochloric acid according to the measured value of the pH meter 62 so that the pH of the water in the pH adjusting tank 6 reaches a set value.
The first sludge concentration tank 7 is respectively communicated with the second sedimentation tank 5, the first reaction tank 2 and the collecting tank 1, and is used for concentrating sediment from the second sedimentation tank 5, transporting the concentrated sediment to the first reaction tank 2 through the first sludge pump 71 and transporting clear liquid to the collecting tank 1;
the second sludge concentration tank 8 is respectively communicated with the first sedimentation tank 3 and the dewatering device 9, and is used for concentrating sediment from the first sedimentation tank 3, transporting the concentrated sediment to the dewatering device 9 through the second sludge pump 81 and transporting clear liquid to the collecting tank 1;
The dewatering device 9 is used for dewatering the precipitate from the second sludge thickener 8 after concentration.
The processing method of the device comprises the following steps:
Transporting excessive sulfate wastewater from the collecting tank 1 to the first reaction tank 2, and carrying out a mixing reaction in the first reaction tank 2 with a precipitate which is derived from the concentration of the first sludge concentration tank 7; the reacted wastewater enters a first sedimentation tank 3 for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a second reaction tank 4 to carry out a mixing reaction with the added hydrogen peroxide and excessive lime powder; the reacted wastewater enters a second sedimentation tank 5 for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a pH adjusting tank 6 for pH adjustment to obtain produced water;
The sediment obtained after the sediment treatment of the second sedimentation tank 5 enters a first sludge concentration tank 7 for concentration, the concentrated sediment is transported to a first reaction tank 2 for mixed reaction with sulfate wastewater, and the concentrated clear liquid is transported to a collecting tank 1;
the sediment obtained after the sediment treatment of the first sedimentation tank 3 enters a second sludge concentration tank 8 for concentration, the concentrated sediment is transported to a dehydration device 9 for dehydration, and the concentrated clear liquid is transported to the collection tank 1.
Comparative example 1
The difference from example 1 is that the hydrogen peroxide adding device is not included.
Test example 1
The treatment systems provided in the example 1 and the comparative example 1 are respectively adopted to treat sulfate radical wastewater in the same batch, and in the treatment process, the lime adding amount (mg/L) of the second reaction tank in the example 1 is controlled to be 4 times of the content of the sulfate radical (mg/L) of the inlet water, and the hydrogen peroxide adding amount (mg/L) is controlled to be 1% of the lime adding amount (mg/L); the lime addition (mg/L) of the second reaction tank in comparative example 1 was controlled to be 4 times the sulfate radical (mg/L) content of the influent water.
The wastewater sample 1 has a sulfate content of 24500mg/L and the treatment results are shown in Table 1.
TABLE 1
| Inflow of water | Effluent from sedimentation tank 1 | Effluent from sedimentation tank 2 | Removal rate% | ||
| Example 1 | Sulfate radical content (mg/L) | 24500 | 7260 | 664.6 | 97.2％ |
| Comparative example 1 | Sulfate radical content (mg/L) | 24500 | 9320 | 1973.8 | 91.9％ |
The wastewater sample 1 has a sulfate content of 4430mg/L and the treatment results are shown in Table 2.
TABLE 2
| Inflow of water | Effluent from sedimentation tank 1 | Effluent from sedimentation tank 2 | Removal rate% | ||
| Example 1 | Sulfate radical content (mg/L) | 4430 | 1280 | 189.6 | 95.70％ |
| Comparative example 1 | Sulfate radical content (mg/L) | 4430 | 1749 | 443.8 | 89.90％ |
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The sulfate wastewater treatment system is characterized by comprising a collecting tank, a first reaction tank, a first sedimentation tank, a second reaction tank, a second sedimentation tank, a pH regulating tank, a first sludge concentration tank, a second sludge concentration tank and a dewatering device;
The collecting tank is communicated with the first reaction tank and is used for conveying the collected sulfate wastewater to the first reaction tank;
The first reaction tank is communicated with the first sludge concentration tank and is used for carrying out a mixing reaction on excessive sulfate wastewater and the precipitate concentrated by the first sludge concentration tank;
the first sedimentation tank is respectively communicated with the first reaction tank and the second reaction tank and is used for sedimentation of wastewater from the reaction of the first reaction tank and transportation of clear liquid to the second reaction tank;
The second reaction tank is provided with a lime powder adding device and a hydrogen peroxide adding device, and is used for carrying out mixed reaction on clear liquid from the first sedimentation tank, the added hydrogen peroxide and excessive lime powder;
The second sedimentation tank is respectively communicated with the second reaction tank and the pH adjusting tank and is used for settling the wastewater from the second reaction tank after reaction and transporting clear liquid to the pH adjusting tank;
The pH adjusting tank is used for adjusting the pH of the clear liquid from the second sedimentation tank to obtain produced water;
The first sludge concentration tank is respectively communicated with the second sedimentation tank, the first reaction tank and the collecting tank and is used for concentrating sediment from the second sedimentation tank, transporting the concentrated sediment to the first reaction tank and transporting clear liquid to the collecting tank;
the second sludge concentration tank is respectively communicated with the first sedimentation tank and the dehydration device and is used for concentrating sediment from the first sedimentation tank, transporting the concentrated sediment to the dehydration device and transporting clear liquid to the collection tank;
the dehydration device is used for dehydrating the precipitate concentrated by the second sludge concentration tank.
2. A sulfate wastewater treatment system according to claim 1, wherein the collection tank is provided with a lift pump for pumping sulfate wastewater from the collection tank to the first reaction tank.
3. The sulfate wastewater treatment system according to claim 1, wherein the first reaction tank is provided with a stirring device and an ultrasonic releaser;
the second reaction tank is provided with a stirring device and an ultrasonic releaser.
4. The sulfate wastewater treatment system of claim 1, wherein the first sedimentation tank comprises an inclined plate sedimentation tank;
the second sedimentation tank comprises an inclined plate sedimentation tank.
5. The sulfate wastewater treatment system according to claim 1, wherein the pH adjusting tank is provided with a stirring device, a pH meter, and an acid addition device.
6. The sulfate wastewater treatment system according to claim 5, wherein the acid adding device is communicated with a pH adjusting tank pipeline, and a valve is arranged on the pipeline;
the valve is interlocked with the pH meter, and the adding rate of the acid is regulated according to the measured value of the pH meter, so that the pH value of water in the pH regulating tank reaches a set value.
7. The sulfate wastewater treatment system of claim 5, wherein the acid added by the acid addition device comprises hydrochloric acid.
8. The sulfate wastewater treatment system of claim 1, further comprising a first sludge pump and a second sludge pump;
The first sludge pump is used for conveying the precipitate concentrated by the first sludge concentration tank to the first reaction tank;
The second sludge pump is used for conveying the sediment concentrated by the second sludge concentration tank to the dewatering device.
9. Use of the sulfate wastewater treatment system of any of claims 1-8 in sulfate wastewater treatment.
10. A method for the treatment of sulfate wastewater, characterized in that it is based on a sulfate wastewater treatment system according to any one of claims 1-8, comprising the steps of:
Transporting excessive sulfate wastewater from a collecting tank to a first reaction tank, and carrying out mixed reaction with a precipitate which is derived from the concentration of a first sludge concentration tank in the first reaction tank; the reacted wastewater enters a first sedimentation tank for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a second reaction tank to carry out a mixing reaction with the added hydrogen peroxide and excessive lime powder; the reacted wastewater enters a second sedimentation tank for sedimentation treatment; the clear liquid obtained after the precipitation treatment enters a pH regulating tank for pH regulation to obtain produced water;
The sediment obtained after the sedimentation treatment in the second sedimentation tank enters a first sludge concentration tank for concentration, the concentrated sediment is transported to a first reaction tank for mixed reaction with sulfate wastewater, and concentrated clear liquid is transported to a collecting tank;
and (3) enabling the sediment obtained after the sediment treatment in the first sedimentation tank to enter a second sludge concentration tank for concentration, conveying the concentrated sediment to a dehydration device for dehydration, and conveying concentrated clear liquid to a collection tank.
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