CN110240253A - A method of utilizing remaining alkali Heat Treatment purified cotton black liquor - Google Patents
A method of utilizing remaining alkali Heat Treatment purified cotton black liquor Download PDFInfo
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- CN110240253A CN110240253A CN201910666779.3A CN201910666779A CN110240253A CN 110240253 A CN110240253 A CN 110240253A CN 201910666779 A CN201910666779 A CN 201910666779A CN 110240253 A CN110240253 A CN 110240253A
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F2101/30—Organic compounds
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
A method of using remaining alkali Heat Treatment purified cotton black liquor, the present invention, which makes full use of more than the waste heat after cotton linter boiling alkaline activity PS/PMS to generate, has the active SO of Strong oxdiative4With the macromolecular organic pollutant in efficient, the quick oxygenolysis black liquor of HO energy.The advanced trip temperature of purified cotton black liquor, pH add PS/PMS solution after adjusting, the PS/PMS in reaction tank is quickly refined the SO that alkali activation more than the waste heat in cotton black liquor generates strong oxidizing property4And HO, purified cotton black liquor make SO under the stirring action in reaction tank4It can sufficiently react with the macromolecular hardly degraded organic substance in purified cotton black liquor with HO, so that macromolecular organic pollutant is broken down into small organic molecule, carbon dioxide and water, realize the efficient removal of organic pollutant.
Description
Technical field
The present invention relates to purified cotton field of waste water treatment, especially a kind of side using remaining alkali Heat Treatment purified cotton black liquor
Method.
Background technique
It is raw material through adding a kind of refined high-purity fiber of alkali thermophilic digestion that purified cotton (Cotton Pulp), which is using cotton linter,
Plain product is widely used in manufacture cellulose esters, nitrocellulose (nitrocotton) and cellulose acetate, is widely used in food, doctor
The various fields such as medicine, daily use chemicals, plastics, electronics, papermaking, metallurgy, aerospace are known as " special industrial monosodium glutamate ", have preferable
Market prospects.China is purified cotton production and using big country, according to statistics domestic and international enterprise to the aggregate demand of purified cotton about
300000 tons, to the total demand of purified cotton about at 10,000 tons or so, remaining is Chinese Enterprise use for overseas enterprise.Purified cotton black liquor
It is exactly a large amount of dark brown waste water of the black digestion liquid that cotton linter generates during adding alkali thermophilic digestion and slurry washing generation,
Wastewater flow rate is about 70 ton/ton products, also referred to as black digestion liquid.Though black liquor only accounts for the 32% of purified cotton waste water total amount, its is organic
Pollutant load accounts for the 90% of the total organic pollutant discharge amount of purified cotton waste water.Purified cotton black liquor is because ultrashort containing a large amount of cottons
Suede, tannin, pectin, grease, wax, xylose, solid content and free alkali etc., biodegradability is poor, and belonging to intractable high concentration has
Machine waste water is always pollution problem urgently to be solved in purified cotton production.
Currently, most of purified cotton waste water are handled using the treatment process of dyeing waste water or black liquid.For essence
The water quality characteristics of cotton black liquor processed, some researchers consider to give birth to after mixing with other waste water again after first pre-processing it
Change processing.Method for purified cotton black liquor pretreatment mainly has boiler slag and flyash method for pretreating, the pre- place of activated coke absorption
Logos, acid out method for pretreating, acid out-carbon fiber adsorption and catalytic combustion method for pretreating, acid out-coagulation-pre-micro-electrolysis disposal method and advanced
Oxidation pre-treatment method etc..Purified cotton black liquor, COD are such as pre-processed using acid out-coagulation-light electrolysis group technologyCr、BOD5With
The highest removal rate of TOC is respectively 65%, 62% and 56%, chroma removal rate 99%, and acute toxicity reduces by 93%, simultaneously
Ultraviolet-visible absorption spectroscopy analysis shows part the bio-refractory substance containing conjugated double bond and phenyl ring be precipitated or converted, make
Biodegradability is obtained to significantly improve；Using ultrasound (US), photochemical oxidation (UV/H2O2) and UV/H2O2+ US method pre-processes purified cotton
Black liquor, CODCrIt is respectively 37.83 and 60% with chroma removal rate.But these processing technique complex process, higher cost, it is difficult to
It gets application in Practical Project.
According to the investigation to the existing processing enterprise's cost for wastewater treatment of purified cotton and discovery is calculated, though black liquor only accounts for purification cotton wastes
The 32% of water inventory, but the processing cost of black liquor probably accounts for 2/3 or more of entire purified cotton cost for wastewater treatment.Persulfate
(PS) it is a kind of asymmetric strong oxidizer with permonosulphuric acid salt (PMS), can be swashed by heat, alkali, ultraviolet light, transition metal etc.
Hydroxyl radical free radical (HO, the E of the raw strong oxidizing property of life birth0=1.9-2.7 V) and potentiometric titrations (SO4 ?, E0=2.5-
3.1V), SO4 ?There are higher oxidation-reduction potential, and SO compared with HO4 ?Survival period (3 × 10- 5-4×10- 5S) compare
The survival period (2 × 10 of HO- 8S) it to grow, be more advantageous to and contacted with pollutant, realize the efficient removal of organic pollutant.Cause
Can this, make full use of waste heat and remaining alkali the activation PS or PMS in purified cotton black liquor to generate the active SO of Strong oxdiative4 ?With
HO efficient oxidation decomposes the macromolecular hardly degraded organic substance in purified cotton black liquor, really realizes energy-saving and emission-reduction and protects environment
Purpose has a very important significance.
Summary of the invention
The present invention make full use of cotton linter boiling produce purified cotton after waste heat more than alkaline activity PS/PMS generate have strong oxygen
Change active SO4 ?And HO, the macromolecular organic pollutant in efficient, quick oxygenolysis black liquor realize purified cotton black liquor
Efficient, quick processing.
Inventive concept of the invention is: partition plate reaction tank is entered after first adjusting the temperature of purified cotton black liquor, pH, anti-
PS or PMS solution is added in the front end Ying Chi, what purified cotton black liquor was generated when reciprocating flowing by flow direction-changing in partition plate reaction tank
Stirring action makes SO4 ?It can sufficiently react, be decomposed with the macromolecular hardly degraded organic substance in black liquor with HO
For small organic molecule, carbon dioxide and water, final quick, the efficient process for realizing purified cotton black liquor.
A kind of method using remaining alkali Heat Treatment purified cotton black liquor provided by the invention is by following technical proposals reality
Existing:
(1) first the temperature of purified cotton black liquor is adjusted to 60 DEG C~80 DEG C, pH and is adjusted to after 10.0~12.0, purified cotton is black
Liquid flows into partition plate reaction tank through pump or liquid level difference；
(2) in partition plate reaction tank front end, every 1m340L~60L is added in purified cotton black liquor, the mmol/L's of 2mmol/L~4
PS or PMS solution, PS the or PMS solution being added in partition plate reaction tank are quickly refined alkali activation generation more than the waste heat in cotton black liquor
The SO of strong oxidizing property4 ?And HO, purified cotton black liquor are stirred when reciprocating flowing by what flow direction-changing generated in partition plate reaction tank
The effect of mixing is so that SO4 ?It sufficiently reacts with the macromolecular hardly degraded organic substance in purified cotton black liquor with HO, realizes purification
The efficient process of cotton black liquor.
Further, the method for above-mentioned processing purified cotton black liquor can also include step (3) by from water outlet water sampling
Analysis for CO D and chromatic value evaluate the efficiency of this method processing purified cotton black liquor.
The optimum process condition parameter are as follows: 1m3PS the or PMS solution of 2~2.5mmol/L of 50L is added in purified cotton black liquor,
70 DEG C of activation temperature, pH=11.0 handle 100min~150min.With this condition, activation PS characteristic contamination pectin is maximum
Removal rate reaches 96.3%, and activation PMS characteristic contamination pectin maximum material removal rate reaches 89.7%.
In PS the or PMS solution, PS is persulfate, and PMS is permonosulphuric acid salt, PS be preferably potassium peroxydisulfate or
Sodium peroxydisulfate, PMS are preferably permonosulphuric acid potassium or permonosulphuric acid sodium.
When using waste heat and remaining alkali activation potassium peroxydisulfate, potassium peroxydisulfate concentration is 2mmol/L, the temperature of purified cotton black liquor
For the optimum process condition parameter that 70 DEG C, pH=11.0, t=100min are, the COD removal rate of purified cotton black liquor reaches maximum
Value 94.6%.
When using waste heat and remaining alkali activation permonosulphuric acid potassium, permonosulphuric acid potassium concn is 2.5mmol/L, purified cotton
The temperature of black liquor is 70 DEG C, pH=11.0, and t=150min is the optimum process condition parameter, the removal effect of COD in purified cotton black liquor
Rate reaches maximum value 90.5%.
Preferably, the partition plate reaction tank is reciprocating partition plate reaction tank.
Purified cotton black liquor of the present invention refers mainly to the dark brown that the black digestion liquid that rotary spherical digester comes out and slurry washing generate
Waste water.
Compared with prior art, of the invention to have a characteristic that
Have Strong oxdiative active 1. the present invention makes full use of more than the waste heat after cotton linter boiling alkaline activity PS/PMS to generate
SO4 ?And HO, the macromolecular organic pollutant in efficient, quick oxygenolysis black liquor, it is truly realized energy-saving and emission-reduction, protects
The purpose in retaining ring border.
2. the PS/PMS being added in reciprocating partition plate reaction tank quickly generates Strong oxdiative by alkali activation more than the waste heat in waste water
The SO of property4 ?And HO；Meanwhile the stirring action that waste water is generated when reciprocating flowing by flow direction-changing in partition plate reaction tank
So that SO4 ?It can sufficiently react with the macromolecular hardly degraded organic substance in waste water with HO.
3.PS/PMS is a kind of asymmetric strong oxidizer, can be generated by activation such as heat, alkali, ultraviolet light, transition metal
The SO of strong oxidizing property4 ?·(E0=2.5-3.1V) and HO (E0=1.9-2.7V), SO4 ?There is higher oxidation also compared with HO
Former current potential, and SO4 ?Survival period (3 × 10- 5-4×10- 5S) survival period (2 × 10 than HO- 8S) it to grow, be more advantageous to
It is contacted with pollutant, realizes the efficient removal of organic pollutant.
Detailed description of the invention
The tendency chart that Fig. 1 various concentration potassium peroxydisulfate influences purified cotton black liquor COD removal rate；
The tendency chart that Fig. 2 difference activation temperature potassium peroxydisulfate influences purified cotton black liquor COD removal rate；
The tendency chart that Fig. 3 difference pH potassium peroxydisulfate influences purified cotton black liquor COD removal rate；
Tendency chart of the alkali activation potassium peroxydisulfate to purified cotton black liquor COD removal effect more than Fig. 4 waste heat；
Fig. 5 potassium peroxydisulfate is to the comparative analysis figure of purified cotton black liquor chromaticity removing effect, and wherein A is untreated black liquor, and B is
After black liquor processing；
Analysis chart of the alkali activation potassium peroxydisulfate to black liquor pectin removal effect more than Fig. 6 waste heat；
The tendency chart that Fig. 7 various concentration permonosulphuric acid potassium influences purified cotton black liquor COD removal rate；
The tendency chart that Fig. 8 difference activation temperature permonosulphuric acid potassium influences purified cotton black liquor COD removal rate；
The tendency chart that Fig. 9 difference pH value permonosulphuric acid potassium influences purified cotton black liquor COD removal rate；
Tendency chart of the alkali activation permonosulphuric acid potassium to purified cotton black liquor COD removal effect more than Figure 10 waste heat；
Figure 11 permonosulphuric acid potassium is to the comparison diagram analysis chart of purified cotton black liquor chromaticity removing effect, and wherein C is untreated
Black liquor, D are after black liquor is handled；
Analysis chart of the alkali activation permonosulphuric acid potassium to black liquor pectin removal effect more than Figure 12 waste heat；
Figure 13 is processing system structural schematic diagram of the present invention, wherein 1, conditioning tank, 2, partition plate reaction tank, 3, temperature sensing
Device A, 4, pH sensors A, 5, COD sensor, 6, three-way magnetic valve, 7, controller, 8, Drop-adding device, 9, temperature sensor B, 10,
PH sensor B.
Specific embodiment
The present invention is described in detail below by specific embodiment, but is not limited the scope of the invention.Unless otherwise specified, originally
Experimental method involved in invention is conventional method, and experiment equipment used, material, reagent etc. commercially obtain.Make
To be preferred, the present invention handles processing system involved in the method for purified cotton black liquor and has the following structure:
As shown in Fig. 13, a kind of system using remaining alkali Heat Treatment purified cotton black liquor, including conditioning tank 1, partition are anti-
Answer pond 2, three-way magnetic valve 6, Drop-adding device 8 and controller 7；The conditioning tank 1 is connected by pipeline A and 2 side of partition plate reaction tank
It connects, 2 other side of partition plate reaction tank connects three-way magnetic valve 6 by being equipped with the pipeline of COD sensor 5, and three-way magnetic valve 6 also divides
Other connection outlet pipeline and pipeline B, pipeline B are connected to pipeline A, and temperature sensor is equipped in the conditioning tank 1 equipped with inlet duct
A3 and pH sensors A 4, partition plate reaction tank 2 is interior to be equipped with temperature sensor B9 and pH sensor B10, is equipped with above partition plate reaction tank 2
Drop-adding device 8, temperature sensor A 3, pH sensors A 4, temperature sensor B9, pH sensor B10, COD sensor 5, three are powered
Magnet valve 6 and Drop-adding device 8 are connect with controller 7.
Embodiment 1
(1) during refined cotton black liquid treatment, purified cotton black liquor first carries out optimum temperature, basicity tune in conditioning tank 1
Section, temperature regulating range are 60 DEG C~80 DEG C, pH adjustable range 10.0~12.0, and then purified cotton black liquor is through pump or liquid level difference stream
Enter reciprocating partition plate reaction tank 2.
(2) temperature sensor B 9 and pH sensor B 10 will handle the temperature and pH of purified cotton black liquor in partition plate reaction tank 2
Data are transferred in controller 7, and controller 7 can adjust the flow velocity of Drop-adding device 8 according to actual temperature and pH, wherein every 1m3Purification
In cotton black liquor be added 40L~60L, PS the or PMS solution of 2mmol/L~4mmol/L, the PS being added drop-wise in partition plate reaction tank 2 or
PMS solution is quickly refined the SO that alkali activation more than the waste heat in cotton black liquor generates strong oxidizing property4 ?And HO, purified cotton black liquor
SO is made by the stirring action that flow direction-changing generates when reciprocating flowing in partition plate reaction tank 24 ?With HO sufficiently with purification
Macromolecular hardly degraded organic substance in cotton black liquor reacts, and macromolecular organic pollutant is decomposed into carbon dioxide and water, temperature
It spends sensor B9 and pH sensor B10 and the data of acquisition is transferred to controller 7, controller 7 controls drop according to the collected data
The drop speed for adding device 8 guarantees difficult to degrade big in PS the or PMS solution for having sufficient amount in different temperatures and pH and purified cotton black liquor
Molecular organic pollutants react；
(3) controller 7 can be adjusted according to the COD numerical value that monitors of water outlet COD sensor water outlet triple valve come
Reflux ratio is controlled, when the COD numerical value that COD sensor 5 monitors is higher than predetermined value, purified cotton black liquor is by pipeline B recurrent canal
Road A is passed through partition plate reaction tank 2 again, when the COD numerical value that COD sensor 5 monitors be lower than predetermined value when, purified cotton black liquor from
Outlet conduit discharge, realizes the efficient process of purified cotton black liquor.
(4) by evaluating the efficiency that this method handles purified cotton black liquor from water outlet water sampling Analysis for CO D and chromatic value.
Embodiment 2
To advanced optimize purified cotton black liquor condition, the present embodiment investigates optimization process in terms of concentration, temperature, pH tri-
Scheme.In the present embodiment-by taking potassium peroxydisulfate as an example.
(1) influence of the potassium peroxydisulfate concentration to COD removal effect
It has primarily looked in 20 DEG C of room temperature, pH=7.0, has added 50ml 0.5mmol/ respectively into 1L purified cotton black liquor
L, totally 6 concentration gradient potassium peroxydisulfates are molten by 1.0mmol/L, 1.5mmol/L, 2.0mmol/L, 2.5mmol/L and 3.0mmol/L
Liquid analyzes the variation (attached drawing 1) of COD removal effect in purified cotton black liquor.With the increase of potassium peroxydisulfate concentration, purified cotton black liquor
The removal rate of middle COD also obviously successively increases.It can be found that: when adding 3.0mmol/L potassium peroxydisulfate 250min, purified cotton is black
The removal rate of COD reaches maximum value 26.1% in liquid；When potassium peroxydisulfate concentration be respectively 2.0mmol/L, 2.5mmol/L and
3.0mmol/L, the removal rate difference of COD is smaller in purified cotton black liquor, handles the removal of purified cotton black liquor sample COD after 300min
Rate is respectively 25.3%, 26.2% and 26.1%.Therefore, comprehensively consider economic benefit and the removal efficiency of COD, the present embodiment is true
The concentration of fixed best addition potassium peroxydisulfate is 2.0mmol/L.
(2) influence of the different temperatures activation potassium peroxydisulfate to COD removal effect
It, can be by heat, alkali, ultraviolet light and transition metal due to persulfate and permonosulphuric acid salt itself design feature
Equal activation generate the SO of strong oxidizing property4 ?And HO, therefore the present embodiment has been investigated as pH=7, different activation temperatures are to essence
The influence (attached drawing 2) of COD removal efficiency in cotton black liquor processed, with the increase of solution temperature, the removal rate of COD in purified cotton black liquor
Also it obviously increases.When the temperature of solution is 70 DEG C, the removal rate of COD reaches 84.3% after processing 200min, handles 300min
After reach maximum value 86.9%.The actual temperature and temperature of black liquor are to black liquor after sufficiently adding alkaline boiling to come out of the stove in conjunction with cotton linter
The influence of middle COD removal efficiency, the present embodiment determine that the optimal activation temperature of potassium peroxydisulfate is 70 DEG C.
(3) influence of the different alkali number activation potassium peroxydisulfates to COD removal effect
Cotton linter is usually to add after sodium hydroxide solution impregnates to put rotary rotary spherical digester thermophilic digestion into, therefore purified cotton is black
Remaining alkali number is higher in liquid, and making full use of the remaining alkali number in purified cotton black liquor to activate persulfate will be helpful to improve organic dirt
It contaminates the removal of object and reduces processing cost, attached drawing 3 is influence of the purified cotton black liquor difference pH to COD removal efficiency.As a result table
Bright: as purified cotton black liquor pH increases to 12.0 by 7.0, the removal rate of COD is also increase accordingly in purified cotton black liquor；But when purification
When the pH of cotton black liquor is respectively 11.0 and 12.0, the removal efficiency of COD is very close in two kinds of samples, COD maximum material removal rate point
It Wei 58.9% and 58.4%.Therefore, black liquor residual alkali number is generated after boiling from cotton linter, determines pH=11.0 conduct
Activate the Optimal pH of potassium peroxydisulfate.
(4) analysis of the alkali activation potassium peroxydisulfate to black liquor COD removal effect more than waste heat
It has surplus heat or containing certain remaining alkali, the present embodiment is examined since the black liquor that cotton linter plus alkaline boiling generate both had contained
It has examined optimum temperature and alkali number while having activated influence (attached drawing 4) of the potassium peroxydisulfate to black liquor COD removal effect.As shown in Figure 4:
When the temperature of purified cotton black liquor is 70 DEG C, pH=11.0, the COD removal rate of purified cotton black liquor reaches maximum after processing 100min
Value 94.6%, A is untreated purified cotton black liquor in Fig. 5, B is that treated purified cotton black liquor, and purified cotton is black as shown in Figure 5
Organic pollutant in liquid and coloration synchronize be removed.It is thus determined that the temperature of purified cotton black liquor be 70 DEG C, pH=11.0,
T=100min is the optimum process condition parameter of potassium peroxydisulfate.
(5) analysis of the alkali activation potassium peroxydisulfate to black liquor pectin removal effect more than waste heat
As shown in Figure 6: when the temperature of purified cotton black liquor is 70 DEG C, pH=11.0, handling the spy of purified cotton after 100min
The elimination rate of pectic of sign pollutant black liquor reaches maximum value 96.3%, this explanation is activated using the remaining alkali waste heat in purified cotton production
Persulfate can effectively remove the macromolecular persistent organic pollutants in black liquor.
Embodiment 3
In the present embodiment the present embodiment-and by taking permonosulphuric acid potassium as an example, it is investigated in terms of concentration, temperature, pH tri- best
Processing scheme.
(1) influence of the permonosulphuric acid potassium concn to COD removal effect
It has primarily looked in 20 DEG C of room temperature, pH=7.0, has added 50ml 0.5mmol/ respectively into 1L purified cotton black liquor
L, 1.0mmol/L, 1.5mmol/L, 2.0mmol/L, 2.5mmol/L and 3.0mmol/L totally 6 concentration gradient permonosulphuric acids
Potassium solution analyzes the variation of COD removal effect in purified cotton black liquor, as shown in Fig. 7, with the increasing of permonosulphuric acid potassium concn
Adding, the removal rate of COD also obviously successively increases in purified cotton black liquor, it can be found that: when addition 2.5mmol/L permonosulphuric acid potassium
When 300min, the removal rate of COD reaches maximum value 24.7% in purified cotton black liquor；When permonosulphuric acid potassium concn is respectively
2.0mmol/L, 2.5mmol/L and 3.0mmol/L, the removal rate difference of COD is smaller in purified cotton black liquor, after handling 300min
The removal rate of purified cotton black liquor sample COD is respectively 23.6%, 24.7% and 24.3%.Therefore, comprehensively consider economic benefit and
The removal efficiency of COD, the present embodiment determine that the optium concentration of addition permonosulphuric acid potassium is 2.5mmol/L.
(2) influence of the different temperatures activation permonosulphuric acid potassium to COD removal effect
The present embodiment has been investigated as pH=7, influence of the different activation temperatures to COD removal efficiency in purified cotton black liquor,
As shown in Fig. 8, with the increase of solution temperature, the removal rate of COD is also obviously increased in purified cotton black liquor.When the temperature of solution
When being 70 DEG C, the removal rate of COD reaches 80.2% after processing 200min, reaches maximum value 83.3% after handling 300min.Sufficiently
Shadow of the actual temperature and temperature of purified cotton black liquor to COD removal efficiency in black liquor after coming out of the stove in conjunction with cotton linter plus alkaline boiling
It rings, the present embodiment determines that the temperature of optimal activation permonosulphuric acid potassium is 70 DEG C.
(3) influence of the different basicity activation permonosulphuric acid potassiums to COD removal effect
Attached drawing 9 is influence of the purified cotton black liquor difference pH to COD removal efficiency.The result shows that: with purified cotton black liquor pH
Increase to 12.0 by 7.0, the removal rate of COD is also increase accordingly in purified cotton black liquor；But when the pH of purified cotton black liquor is respectively
When 11.0 and 12.0, the removal efficiency of COD is very close in two samples, and COD maximum material removal rate is respectively 54.9% He
55.3%.Accordingly, it is considered to determine pH=11.0 conduct to purified cotton black liquor residual alkali number is generated after boiling from cotton linter
Activate the Optimal pH of permonosulphuric acid potassium.
(4) analysis of the alkali activation permonosulphuric acid potassium to black liquor COD removal effect more than waste heat
It has surplus heat or containing certain remaining alkali, the present embodiment is examined since the black liquor that cotton linter plus alkaline boiling generate both had contained
It has examined optimum temperature and alkali number while having activated influence (attached drawing 10) of the permonosulphuric acid potassium to black liquor COD removal effect, Tu11Zhong
C is untreated purified cotton black liquor, and D is treated purified cotton black liquor.As shown in the above results, it is known that when purified cotton black liquor
When temperature is 70 DEG C, pH=11.0, the COD removal rate of purified cotton black liquor reaches maximum value 90.5% after processing 150min, bright
The removal rate of COD in purified cotton black liquor when being greater than thermal activation or adding alkali activation independent role is shown, this illustrates thermal activation and alkali is added to live
Changing synergistic effect facilitates the removal of COD in purified cotton black liquor, it is thus determined that the temperature of purified cotton black liquor is 70 DEG C, pH=
11.0, t=150min be the optimum process condition parameter of permonosulphuric acid potassium.
(5) analysis of the alkali activation permonosulphuric acid potassium to black liquor pectin removal effect more than waste heat
As shown in Figure 12: when the temperature of purified cotton black liquor is 70 DEG C, pH=11.0, handling the spy of purified cotton after 150min
The elimination rate of pectic of sign pollutant black liquor reaches maximum value 89.7%, this explanation is activated using the remaining alkali waste heat in purified cotton production
Persulfate can effectively remove the macromolecular persistent organic pollutants in black liquor.
The preferable specific embodiment of the above, only the invention, but the protection scope of the invention is not
It is confined to this, anyone skilled in the art is in the technical scope that the invention discloses, according to the present invention
The technical solution of creation and its inventive concept are subject to equivalent substitution or change, should all cover the invention protection scope it
It is interior.
Claims (7)
1. a kind of method using remaining alkali Heat Treatment purified cotton black liquor, which is characterized in that by the temperature of purified cotton black liquor, pH tune
Partition plate reaction tank is entered after section, PS or PMS solution is added in reaction tank front end, PS or PMS solution is refined in reaction tank
Alkali activation generates the active SO of Strong oxdiative more than cotton black liquor waste heat4 ?Have with HO and the macromolecular difficult to degrade in purified cotton black liquor
Machine pollutant is reacted, and small organic molecule, carbon dioxide and water are broken down into.
2. a kind of method using remaining alkali Heat Treatment purified cotton black liquor according to claim 1, which is characterized in that specific
Operating procedure is as follows:
(1) first the temperature of purified cotton black liquor is adjusted to 60 DEG C~80 DEG C, pH and is adjusted to 10.0~12.0, through pump or liquid level difference stream
Enter reciprocating partition plate reaction tank；
(2) in partition plate reaction tank front end, every 1m3In purified cotton black liquor be added 40L~60L, the PS of 2mmol/L~4mmol/L or
PMS solution, PS the or PMS solution being added in partition plate reaction tank are quickly refined the strong oxygen of alkali activation generation more than the waste heat in cotton black liquor
The SO for the property changed4 ?And HO, SO4 ?It sufficiently reacts with the macromolecular hardly degraded organic substance in purified cotton black liquor with HO,
Realize the efficient process of purified cotton black liquor.
3. a kind of method using remaining alkali Heat Treatment purified cotton black liquor according to claim 2, which is characterized in that also wrap
Step (3) is included by evaluating the efficiency that this method handles purified cotton black liquor from water outlet water sampling Analysis for CO D and chromatic value.
4. a kind of method using remaining alkali Heat Treatment purified cotton black liquor according to claim 2, which is characterized in that best
Treatment process parameter are as follows: 1m3PS the or PMS solution of addition 50L2~2.5mmol/L in purified cotton black liquor, 70 DEG C of activation temperature,
PH=11.0 handles 100min~150min.
5. a kind of method using remaining alkali Heat Treatment purified cotton black liquor according to claim 2, which is characterized in that when adopting
When with waste heat and remaining alkali activation potassium peroxydisulfate, potassium peroxydisulfate concentration is 2mmol/L, and the temperature of purified cotton black liquor is 70 DEG C, pH=
11.0 t=100min.
6. a kind of method using remaining alkali Heat Treatment purified cotton black liquor according to claim 2, which is characterized in that when adopting
When with waste heat and remaining alkali activation permonosulphuric acid potassium, permonosulphuric acid potassium concn is 2.5mmol/L, and the temperature of purified cotton black liquor is
70 DEG C, pH=11.0, t=150min.
7. a kind of method using remaining alkali Heat Treatment purified cotton black liquor according to claim 2, which is characterized in that described
Partition plate reaction tank be reciprocating partition plate reaction tank.
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| CN114275950A (en) * | 2021-11-25 | 2022-04-05 | 湖北金汉江精制棉有限公司 | Method for efficiently degrading purified cotton black liquor |
| CN114308081A (en) * | 2021-11-25 | 2022-04-12 | 湖北金汉江精制棉有限公司 | Refined cotton cooking catalyst and preparation method thereof |
| CN114920347A (en) * | 2022-06-08 | 2022-08-19 | 河海大学 | Organic dye industrial wastewater degradation agent and degradation process |
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| CN114920347A (en) * | 2022-06-08 | 2022-08-19 | 河海大学 | Organic dye industrial wastewater degradation agent and degradation process |
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