CN106277459A - Desulfuration processing method and processing means to waste water - Google Patents
Desulfuration processing method and processing means to waste water Download PDFInfo
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- CN106277459A CN106277459A CN201610793152.0A CN201610793152A CN106277459A CN 106277459 A CN106277459 A CN 106277459A CN 201610793152 A CN201610793152 A CN 201610793152A CN 106277459 A CN106277459 A CN 106277459A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- Environmental & Geological Engineering (AREA)
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- Biomedical Technology (AREA)
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- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention relates to a kind of desulfuration processing method to waste water, be to use processing method waste water being carried out air stripping desulfurization with spray recovery sulfur, including waste water being carried out desulfurization process and sulfur recovery process step.The desulfuration processing method to waste water that the present invention obtains, is using pH value as crucial Control factors, it is achieved the combination of each processing links, thus the sulphur pollution in efficient removal waste water.Sulfur content in processed waste water is made to reach the secondary discharge standard requirement of GB8978 1996 " integrated wastewater discharge standard ", and the sulfur of removing is converted into recycling chemical products, significant benefit it is respectively provided with, it is achieved green chemical industry in terms of economic worth and environmental protection.Additionally, the processing means that the present invention provides, operation and the operation of processing method the most of the present invention control, and conveniently and efficiently realize the desulfurization process to waste water and sulfur recovery.
Description
Technical field
The present invention relates to a kind of waste water technical field of desulfurization, particularly relate to a kind of desulfuration processing method to waste water, and
Processing means for this processing method.
Background technology
Along with deepening continuously of process of industrialization, in industrial wastewater, kind and the water yield of sulfur-containing waste water are all being continuously increased,
Owing to most sulfate dissolubility in water is very big, and stable in properties in nature, so relying on merely nature clean
Change effect is very difficult to except the sulphur pollution in waste water.Sulfur-containing waste water enters water body can make to accept water acidification, endangers aquatile；Row
Enter farmland and can destroy Soil structure, make soil compaction, reduce crop yield and reduce quality of agricultural product；And in anaerobism or scarce
Under conditions of oxygen, sulfate can be reduced generation hydrogen sulfide under sulfate reducting bacteria SRB effect, and it is weak that hydrogen sulfide is dissolved in water
Acidity, heavy corrosion drainage pipeline and water processing establishment, it addition, hydrogen sulfide odor stench, severe contamination air.Currently for
In waste water, the processing method of sulphur pollution is substantially summarised as three kinds, and including (1) biological desulfurization, treatment effect is unstable；(2) chemistry
Oxidation, the sedimentation method, need to add reagent, relatively costly, and easily blocks pipeline；(3) burning absorption process, equipment requirements is high, and cost is held high
Expensive.All there is technical deficiency in this three classes method, therefore seeks effective sulfur-containing waste water process technique and become environmental project circle
Question of common concern.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides a kind of desulfuration processing method to waste water, permissible
On the premise of not introducing any material, remove the sulphur pollution of high-load in waste water, make sulfur content in processed waste water reach
Secondary discharge standard requirement in GB8978-1996 " integrated wastewater discharge standard ", and sulfur acquisition sodium sulfide can be reclaimed.
For achieving the above object, the invention provides a kind of desulfuration processing method to waste water, be to use waste water is carried out
Air stripping desulfurization reclaims the processing method of sulfur with spray, comprises the following steps:
A, desulfurization processing step: to waste water add dilution heat of sulfuric acid, regulation acid-base value after spray, inversely contact with air into
Row air stripping desulfurization processes, the discharge of wastewater after desulfurization；After described desulfurization, the pH value of waste water controls is 0.8～1.2；
B, sulfur recovery process step: will after described desulfurization processing step escaping gas at two-step desulfurization absorption
Discharging after reason, described two-step desulfurization absorption processes and includes being processed through described desulfurization by the first grade desulfurizing absorbing liquid of circulated sprinkling
After step, escaping gas carries out first order desulfurization absorption and processes step, and by the two-grade desulfurizing absorbing liquid of circulated sprinkling and benefit
The NaOH solution filling spray carries out second level desulfurization suction to escaping gas after described first order desulfurization absorption processes step
Receipts process step；The pH value controlling first grade desulfurizing absorbing liquid is 10.7～11.3, reclaims first grade desulfurizing absorbing liquid；Described NaOH is molten
In liquid, the mass content of NaOH is 20%～22%, and described two-grade desulfurizing absorbing liquid is to be absorbed in second level desulfurization by NaOH solution
Processing recirculation spray after carrying out sulfur absorption in step and carry out the mixed solution that sulfur absorption obtains, described first grade desulfurizing absorbing liquid is
By two-grade desulfurizing absorbing liquid first order desulfurization absorption process in step carry out sulfur absorption after recirculation spray carry out sulfur and absorb
The mixed solution arrived.
The waste water desulfuration processing method of the present invention for high-load sulfur waste water, use waste water is carried out air stripping desulfurization with
Spray reclaims the mode that sulfur combines, the high-load sulphur pollution in efficient removal waste water, makes sulfur content in processed waste water reach
The secondary discharge standard requirement of GB8978-1996 " integrated wastewater discharge standard " table 4, and reclaim sulfur acquisition sodium sulfide, make pollutant
Change into available valuable chemical products, it is achieved green chemical industry.
Waste water is first carried out desulfurization process, by adding the soda acid of dilute sulfuric acid regulation waste water to waste water in processing method
Degree, the desulfurization on the one hand realizing being carried out by air purging waste water processes, and utilizes sulphuric acid as regulation acid to avoid air stripping
The effusion of the foreign-matter contamination of process vulcanisation hydrogen contamination beyond the region of objective existence, to ensure sulfur recovery effect and the air-treatment effect of subsequent step
Really；On the other hand the pH value of waste water after control desulfurization, to ensure the desulfurized effect of waste water, makes sulfur content in waste water be less than 1mg/L,
Reach the secondary discharge standard requirement in GB8978-1996 " integrated wastewater discharge standard " table 4.The dilute sulfuric acid amount added in waste water
After desulfurization, the pH value of waste water regulates and controls for standard, and after making desulfurization, the pH value of waste water maintains 0.8～1.2.The sulfur of removing is dirty
Dye thing enters into sulfur recovery process with hydrogen sulfide form with air and reclaims, successively via first grade desulfurizing absorbing liquid to major part
Hydrogen sulfide carries out first order circulated sprinkling absorption, forms the concentrate circulating based on NaHS, then absorbs via two-grade desulfurizing
Liquid and the NaOH solution supplemented carry out second level circulated sprinkling absorption to remaining a small amount of hydrogen sulfide, and formed based on sodium sulfide is lean
Liquid circulates；Described NaOH solution need to be supplemented in the way of spray, and maintains by controlling the pH value of first grade desulfurizing absorbing liquid
10.7～11.3 scopes, the supplementary spray flux of regulation and control NaOH solution, thus realize the thorough absorption to removing Air Hydrogen Sulfide,
Gas after absorption processes is made to reach " emission standard for odor pollutants " (GB14554-93)；It addition, supplement spray by limiting
NaOH solution mass content (20%～22%) and reclaim first grade desulfurizing absorbing liquid pH value range (10.7～
11.3), the mass content making the first grade desulfurizing absorbing liquid of recovery reach NaHS meets the standard of 28%, can being directly used as
Chemical product uses, as can be used for depilation and the tanning process etc. of rawhide in leather industry.
The processing method of the present invention, using pH value as crucial Control factors, it is achieved the combination of each processing links, enters
And on the premise of not introducing any material, complete the high-efficiency desulfurization to high-load sulfur waste water process, and the sulfur of removing is converted into
Recycling chemical products, are respectively provided with significant benefit in terms of economic worth and environmental protection.
As the further restriction to aforesaid way, in step a, H in described dilution heat of sulfuric acid2SO4Mass content be
30%～50%.
As the further restriction to aforesaid way, in step a, described air stripping desulfurization processing procedure, air is with useless
The gas liquid ratio of water is (3000-5000): 1, and the void tower flow velocity of air is 1.0-2.0m/s.
As the further restriction to aforesaid way, in step b, described first order desulfurization absorption processes step, gas with
The gas liquid ratio of first grade desulfurizing absorbing liquid is (30-100): 1；The desulfurization absorption of the described second level processes step, gas and two-grade desulfurizing
The gas liquid ratio of absorbing liquid is (30-100): 1.
Limit the gas liquid ratio of air stripping desulfurization processing procedure, void tower flow velocity in processing method further, at desulfurization absorption
The operating parameters such as the gas liquid ratio of reason process, make desulfurization process and reach optimum operation process, and then in treatment effect and processing cost
Etc. aspect reach all good.
Meanwhile, present invention also offers the desulfurization processing means to waste water, including pipe-line mixer, on pipe-line mixer
Connect via acid adding dosing pump and have acid solution tank；Also including the desulfurization stripping tower being connected to pipe-line mixer downstream, described desulfurization is blown
The liquid outlet of de-tower is provided with a PH detector, and described acid adding dosing pump controls to be connected in a PH detector；Described desulfurization is blown
The gas outlet of de-tower connects sulfur recovery unit, and described sulfur recovery unit includes that concatenate mutually is respectively provided with reservoir and via following
First sulfur tail gas absorber of the spray head that ring pump is connected with reservoir and the second sulfur tail gas absorber, the first sulfur tail gas absorber
And second the reservoir of sulfur tail gas absorber be connected, the second sulfur tail gas absorber is provided with via adding alkali pump and alkali liquid tank phase
Alkali liquor even supplements spray head, connects and have overfall, described overfall to be provided with the at the reservoir of the first sulfur tail gas absorber
Two PH detectors, described in add alkali pump control be connected in the 2nd PH detector.
As the further restriction to aforesaid way, it is serially connected with homogenizing tank in the upstream of pipe-line mixer.
As the further restriction to aforesaid way, described in the second sulfur tail gas absorber, alkali liquor supplements spray head and is placed in
On spray head.
The processing means that the present invention provides is more conducive to the operation of above-mentioned processing method and runs control, it is possible to convenient, efficiently
Ground realizes the desulfurization to waste water and processes, and makes the waste water after process meet in GB8978-1996 " integrated wastewater discharge standard " table 4
Secondary discharge standard requirement, is more conducive to the sulfur of removing is converted into recycling chemical products, it is achieved reclaim.
In sum, use technical scheme, it is thus achieved that the desulfuration processing method to waste water, use waste water is entered
Row air stripping desulfurization reclaims, with spray, the mode that sulfur combines, using pH value as crucial Control factors, it is achieved respectively process ring
The combination of joint, at the high-load sulphur pollution not introduced on the premise of any material in efficient removal waste water, useless after making process
In water sulfur content reach < the secondary discharge standard requirement in 1mg/L, i.e. GB8978-1996 " integrated wastewater discharge standard " table 4,
And the sulfur of removing is converted into recycling chemical products, and in terms of economic worth and environmental protection, it is respectively provided with significant benefit, real
Existing green chemical industry.Additionally, the processing means that the present invention provides, the operation of the most above-mentioned processing method and operation control, convenient,
Realize the desulfurization process to waste water and sulfur recovery efficiently.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings and detailed description of the invention to the present invention make further describe in detail:
Fig. 1 is the structure diagram of the desulfurization processing means of the waste water described in the embodiment of the present invention；
Fig. 2 is the structure diagram of the sulfur recovery unit described in the embodiment of the present invention；
Fig. 3 is the structure diagram of the desulfurization stripping tower described in the embodiment of the present invention；
Fig. 4 is the structure diagram of the second sulfur tail gas absorber described in the embodiment of the present invention；
In figure: 1, pipe-line mixer；2, acid solution tank；3, acid adding dosing pump；4, desulfurization stripping tower；5, a PH detector；
6, the first sulfur tail gas absorber；7, the second sulfur tail gas absorber；8, alkali pump is added；9, alkali liquid tank；10, the 2nd PH detector；11, cigarette
Chimney；12, homogenizing tank；40, tower body；41, inlet；42, stripping tower spray head；43, filler；44, liquid outlet；45, gas outlet；
46, aerator；70, tower body；71, reservoir；72, air inlet；73, filler；74, circulated sprinkling head；75, alkali liquor supplements spray
Head；76, gas outlet.
Detailed description of the invention
Embodiment
The present embodiment relates to the desulfurization to high-load sulfur waste water and processes.
As depicted in figs. 1 and 2, it includes pipe-line mixer 1 to the desulfurization processing means to waste water of the present embodiment, at pipeline
Blender 1 upstream connects an acid solution tank 2, in acid solution tank 2 diluted acid of storage by be arranged on pipe-line mixer 1 and acid solution tank 2 it
Between acid adding dosing pump 3 add diluted acid with the pH value of waste water in regulation and control pipe-line mixer 1 to pipe-line mixer 1 quantification.At pipe
Road blender 1 downstream connects has the desulfurization stripping tower 4 with aerator, the liquid outlet of described desulfurization stripping tower 4 to set up a PH
Detector 5, described PH detector 5 connection is controlled in described acid adding dosing pump 3, in order to go out liquid according to desulfurization stripping tower 4
The pH value regulation and control acid adding dosing pump 3 of waste water at Kou, and then the acid adding amount that regulation and control are in pipe-line mixer 1.Going out of desulfurization stripping tower 4
QI KOU connects sulfur recovery unit, and this sulfur recovery unit includes the first sulfur tail gas absorber 6 and the second sulfur tail gas absorption of concatenation
Tower 7, is respectively provided with reservoir in the first sulfur tail gas absorber 6 and the second sulfur tail gas absorber 7, and via following of arranging outside tower
The circulated sprinkling head that ring pump is connected with reservoir, the first sulfur tail gas absorber 6 also with the reservoir in the second sulfur tail gas absorber 7
It is connected.
Being additionally provided with alkali liquor in the second sulfur tail gas absorber 7 and supplement spray head, alkali liquor supplements spray head via tower peripheral hardware
The alkali pump 8 that adds put is connected to alkali liquid tank 9, for store in supplementing spray alkali liquid tank 9 in the second sulfur tail gas absorber 7
NaOH solution, for giving full play to the supplementary assimilation effect of NaOH solution, alkali liquor supplements spray head and is also placed in the second sulfur tail gas absorption
On circulated sprinkling head in tower 7.Connect at the reservoir of the first sulfur tail gas absorber 6 and have overfall, at this overfall
Setting up the 2nd PH detector 10, the 2nd PH detector 10 connection is controlled in and adds alkali pump 8, with according to the first sulfur tail gas absorber 6
The pH value regulation and control of the first grade desulfurizing absorbing liquid in reservoir add alkali pump 8, and then regulation and control supplement spray in the second sulfur tail gas absorber 7
The caustic dosage drenched.
The treatment fluid discharged through the liquid outlet of desulfurization stripping tower 4 can enter the relevant treatment technique in downstream and continue with, and
Gas after the second sulfur tail gas absorber 7 processes is discharged by chimney 11.For convenience of the process to waste water in the present embodiment,
The upstream concatenation of pipe-line mixer 1 arranges homogenizing tank 12, by waste water input to homogenizing tank 12, makes waste water quality stable.This reality
Executing Fig. 3 in example and show the structure of desulfurization stripping tower 4, shown in Fig. 3, desulfurization stripping tower 4 includes tower body 40, at tower body 40 end
Portion connects aerator 46, and arranges liquid outlet 44, and tower body 40 top arranges gas outlet 45, is then provided with filler in tower body 40
43, above filler 43, be then provided with stripping tower spray head 42, stripping tower spray head 42 be arranged on entering of tower body 40 top
Liquid mouth 41 connects, and inlet 41 is then connected with the liquid outlet of homogenizing tank 12 by elevator pump.
Fig. 4 then shows the structure of the second sulfur tail gas absorber 7, and it includes that tower body 70, tower body 70 inner bottom part are reservoir
71, reservoir 71 is arranged over air inlet 72, and air inlet 72 is provided above filler 73, and the top of filler 73 then arranges circulation spray
Pouring 74 and alkali liquor supplement spray head 75, and alkali liquor supplements spray head 75 and arranges also above circulated sprinkling head 74, circulated sprinkling head 74
Being connected to reservoir 71 by circulating pump, alkali liquor supplements spray head 75 and is connected to the first alkali liquid tank 9, also sets at the top of tower body 70
It is equipped with gas outlet 76.In the present embodiment, the first sulfur tail gas absorber 6 is in addition to being not provided with acid solution and supplementing spray head 75, and other is tied
Structure and the second sulfur tail gas absorber 7 are essentially identical, repeat no more herein.
Embodiment 1
Above-mentioned processing means is carried out the desulfurization to waste water process, by waste water (sulfur content scope be 9000～
12000mg/L) input is to homogenizing tank, then carries out following process:
A, desulfurization processing step: (quality contains to add dilution heat of sulfuric acid pipe-line mixer from the waste water of homogenizing tank output
Amount is 30%～50%) adjust pH value, input after mix homogeneously to desulfurization stripping tower and spray, the waste water of spray Ta Nei with
Inversely contacting from the air of aerator blowout and carry out air stripping desulfurization process, after desulfurization, waste water is from the liquid outlet of desulfurization stripping tower
Discharge, reaches GB8978-1996 " integrated wastewater discharge standard " table 4 secondary discharge standard；Processing procedure detects according to a PH
The numerical control acid adding dosing pump of instrument detection, and then control pH value of waste water (numerical value of the i.e. the oneth PH detector detection) dimension after desulfurization
Hold 0.8～1.2；
B, sulfur recovery process step: carry out two-stage from the input of desulfurization stripping tower gas outlet escaping gas to sulfur recovery unit
Desulfurization absorption processes, and gas is carried out the first order by the first grade desulfurizing absorbing liquid of circulated sprinkling in being introduced into the first sulfur tail gas absorber
Desulfurization absorption processes, and by the two-grade desulfurizing absorbing liquid of circulated sprinkling and supplements spray subsequently into the second sulfur tail gas absorber
NaOH solution (mass content is 21 ± 1%) carries out second level desulfurization absorption and processes, from the second sulfur tail gas absorber gas outlet ease
The gas " emission standard for odor pollutants " (GB14554-93) gone out, can be directly discharged to air；Processing procedure is according to the 2nd PH
In the pH value of the first grade desulfurizing absorbing liquid of detector detection controls the second sulfur tail gas absorber, alkali liquor supplements spray head spray NaOH
The spray flux of solution, the pH controlling first grade desulfurizing absorbing liquid reaches 10.7～11.3, by the overflow of the first sulfur tail gas absorber
Mouth reclaims first grade desulfurizing absorbing liquid, and the first grade desulfurizing absorbing liquid of recovery is hydrogen sulfide solution, can reach GB23937-2009 " work
Industry NaHS " table 1 liquid L-3 standard-required, can be used for selling；Described two-grade desulfurizing absorbing liquid is at the second sulfur tail gas absorption
After carrying out sulfur absorption in tower recirculation spray carry out sulfur absorb obtain based on sodium sulfide and the mixed solution of sodium hydroxide, institute
State first grade desulfurizing absorbing liquid for recirculation spray after being carried out sulfur absorption by two-grade desulfurizing absorbing liquid in the first sulfur tail gas absorber
Carry out sulfur and absorb the mixed solution based on NaHS obtained.
Above-mentioned processing method, in step a, in desulfurization stripping tower, air is (3000-5000) with the gas liquid ratio of waste water: 1
(m3/m3), the void tower flow velocity of air is 1.0-2.0m/s；In step b, in the first sulfur tail gas absorber, gas liquid ratio is (i.e. at desulfurization
Escaping gas and the ratio of first grade desulfurizing absorbing liquid after reason step) be (30-100): 1 (m3/m3), the second sulfur tail gas absorber
Interior gas liquid ratio (i.e. escaping gas and the ratio of two-grade desulfurizing absorbing liquid after first order desulfurization absorption processes step) is (30-
100):1(m3/m3)。
After testing, processed waste water sulfide < 1mg/L.Conformance with standard GB8978-1996 " integrated wastewater discharge standard " table
4 secondary discharge standards
Pollutant load H in gas2S<1mg/m3, meet " emission standard for odor pollutants " (GB14554-93).
Embodiment 2
The present embodiment relates to control conditions different in embodiment 1 processing method waste water, the impact of gas treatment result.
Embodiment 2.1
Use processing means same as in Example 1, with identical processing method to high-load sulfur waste water (in original waste water
Sulfur content is 9837mg/L) process, in the identical lower detection pH control condition of other operating condition to waste water, gas treatment knot
The impact of fruit, experiment and result are as shown in the table:
As seen from the above table, in the desulfuration processing method to waste water of the present invention, the pH value of two links controls for desulfurization
Process most important, after first grade desulfurizing stripping tower, wastewater pH controls less than 1.2, the first sulfur tail gas absorber overfall liquid pH
Span of control is more than 10.7, and the high-load sulphur pollution in waste water can be made thoroughly to be processed, and " sewage is combined to reach GB8978-1996
Close discharge standard " table 4 secondary discharge standard and " emission standard for odor pollutants " (GB14554-93), and the sulfur of removing is converted
For recycling chemical products, it is achieved high efficiente callback.
Embodiment 2.2
Use processing means same as in Example 1, with identical processing method to high-load sulfur waste water (in original waste water
Sulfur content is 9837mg/L) process, in control conditions such as the identical lower detection air velocity of other operating condition and gas liquid ratios
On waste water, the impact of gas treatment result, experiment and result are as shown in the table:
As seen from the above table, in the desulfuration processing method to waste water of the present invention, the condition meeting such as each air velocity and gas liquid ratio
The impact desulfurization result to waste water.
The desulfuration processing method to waste water of the present invention, it is possible to efficient removal waste water on the premise of not introducing other material
In high-load sulphur pollution, treatment effect is stable, and the sulfur of removing is converted into recycling chemical products, in economic worth
It is respectively provided with significant benefit, it is achieved green chemical industry with environmental protection aspect.
Claims (7)
1. the desulfuration processing method to waste water, it is characterised in that use and waste water is carried out air stripping desulfurization and sprays back
Receive the processing method of sulfur, comprise the following steps:
A, desulfurization processing step: add dilution heat of sulfuric acid to waste water, spray after regulation acid-base value, inversely contact with air and carry out sky
Air-blowing desulfurization processes, the discharge of wastewater after desulfurization；After described desulfurization, the pH value of waste water controls is 0.8～1.2；
B, sulfur recovery process step: will after described desulfurization processing step escaping gas through two-step desulfurization absorption process after
Discharge, described two-step desulfurization absorption processes and includes by the first grade desulfurizing absorbing liquid of circulated sprinkling through described desulfurization processing step
Rear escaping gas carries out first order desulfurization absorption and processes step, and by the two-grade desulfurizing absorbing liquid of circulated sprinkling and supplementary spray
Escaping gas after described first order desulfurization absorption processes step is carried out at the desulfurization absorption of the second level by the NaOH solution drenched
Reason step；The pH value controlling first grade desulfurizing absorbing liquid is 10.7～11.3, reclaims first grade desulfurizing absorbing liquid；In described NaOH solution
The mass content of NaOH is 20%～22%, and described two-grade desulfurizing absorbing liquid is to be processed in second level desulfurization absorption by NaOH solution
After carrying out sulfur absorption in step, recirculation spray carries out the mixed solution that sulfur absorption obtains, and described first grade desulfurizing absorbing liquid is by two
After level desulfurization absorbing liquid carries out sulfur absorption in first order desulfurization absorption processes step, recirculation spray carries out what sulfur absorption obtained
Mixed solution.
Desulfuration processing method to waste water the most according to claim 1, it is characterised in that: in step a, described dilute sulfuric acid is molten
H in liquid2SO4Mass content be 30%～50%.
Desulfuration processing method to waste water the most according to claim 1, it is characterised in that: in step a, described air stripping
Desulfurization processing procedure, air is (3000-5000) with the gas liquid ratio of waste water: 1, and the void tower flow velocity of air is 1.0-2.0m/s.
Desulfuration processing method to waste water the most according to claim 1, it is characterised in that: in step b, the described first order takes off
Sulfur absorption processes step, and gas is (30-100) with the gas liquid ratio of first grade desulfurizing absorbing liquid: 1；At the desulfurization absorption of the described second level
Reason step, gas is (30-100) with the gas liquid ratio of two-grade desulfurizing absorbing liquid: 1.
5. the desulfurization processing means to waste water, it is characterised in that: include pipe-line mixer, via adding on pipe-line mixer
Acid dosing pump connects acid solution tank；Also include the desulfurization stripping tower being connected to pipe-line mixer downstream, described desulfurization stripping tower
Liquid outlet is provided with a PH detector, and described acid adding dosing pump controls to be connected in a PH detector；Described desulfurization stripping tower
Gas outlet connects a sulfur recovery unit, and described sulfur recovery unit include concatenating mutually be respectively provided with reservoir and via circulating pump with
First sulfur tail gas absorber of the spray head that reservoir is connected and the second sulfur tail gas absorber, the first sulfur tail gas absorber and second
The reservoir of sulfur tail gas absorber is connected, and is provided with via adding the alkali that alkali pump is connected with alkali liquid tank on the second sulfur tail gas absorber
Liquid supplements spray head, connects and have overfall, described overfall to be provided with the 2nd PH inspection at the reservoir of the first sulfur tail gas absorber
Survey instrument, described in add alkali pump control be connected in the 2nd PH detector.
Desulfurization processing means to waste water the most according to claim 5, it is characterised in that: go here and there in the upstream of pipe-line mixer
It is connected to homogenizing tank.
Desulfurization processing means to waste water the most according to claim 5, it is characterised in that: in the second sulfur tail gas absorber
Described alkali liquor supplements spray head and is placed on spray head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610793152.0A CN106277459A (en) | 2016-08-31 | 2016-08-31 | Desulfuration processing method and processing means to waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610793152.0A CN106277459A (en) | 2016-08-31 | 2016-08-31 | Desulfuration processing method and processing means to waste water |
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| CN106277459A true CN106277459A (en) | 2017-01-04 |
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| CN107433116A (en) * | 2017-09-24 | 2017-12-05 | 河北旭杰环境工程有限公司 | VB12Produce the processing method and processing unit of tail gas |
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