CN109095729A - The alkaline defibrination wastewater treatment and circulation utilization method of reverse osmosis membrane apparatus are installed - Google Patents
The alkaline defibrination wastewater treatment and circulation utilization method of reverse osmosis membrane apparatus are installed Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
- C01D1/04—Hydroxides
- C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F2101/30—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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2866—Particular arrangements for anaerobic reactors
- C02F3/2893—Particular arrangements for anaerobic reactors with biogas recycling
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Abstract
The invention discloses a kind of alkaline defibrination wastewater treatment for being equipped with reverse osmosis membrane apparatus and circulation utilization methods.Fermentation process, the reverse osmosis membrane concentration of clear liquid, the basification of concentrate, the direct reuse of reverse osmosis freshwater, lime regeneration 5 steps of this method through parlkaline defibrination waste water, organic matter is eliminated from alkaline defibrination waste water, it realizes the regeneration of sodium hydroxide and lime simultaneously and recycles, furthermore, it can be realized recycling for alkaline defibrination waste water, reduce discharge of wastewater and cause environmental pollution.Compared with conventional alkaline defibrination wastewater treatment method, the invention has the following advantages that (1) can recycle sodium hydroxide from alkaline defibrination waste water；(2) it realizes the regeneration of sodium hydroxide and lime and recycles；(3) fresh water is obtained using the method for reverse osmosis membrane concentration, then defibrination and pulp washing water is made into fresh water reuse, can be realized recycling for waste water, the amount for carrying inorganic sodium in paper pulp secretly can be reduced, while improving alkali recovery.
Description
Technical field
The invention belongs to technical field of waste water processing, and in particular to the alkaline defibrination wastewater treatment of pulp mill and recycle
Method.
Background technique
In high yield pulp1 chemi-mechanical pulp preparation process, using low-concentration alkali liquor immersion or boiling fibrous raw material, make hydrogen
A part of lignin reaction in sodium oxide molybdena and fibrous raw material simultaneously dissolves water, reach softening fibre and improves the hydrophily of raw fibre
Effect.After immersion or boiling fibrous material, the fibrous raw material and low concentration black liquor that are softened.The softening wood being obtained by filtration
In piece, the organic matter for being entrained with a large amount of moisture and not being dissolved out, including lignin sodium, sodium resinate, Carboxylic Acid Fibre element
Sodium and other organic substances.By defibrination, the fiber fines that these organic matters and defibrination process in softening fibre generate are released
It is put into water, forms alkaline defibrination waste water.
This alkalinity defibrination waste water lignin, hemicellulose, organic matter and sodium element rich in are a kind of renewable
Resource；It is also typical treating high-concentration saline organic wastewater.Currently, in process of production, micro- life such as anaerobism and aeration is generallyd use
Object method handles low-concentration organic waste water, and to reach higher discharge standard, Fenton advanced oxidation processes are also used to digest microorganism hardly possible
With the waste water of degradation.Treating high-concentration saline organic wastewater has the inhibition to microorganism, needs just to be fitted with after clear water Macrodilution
It closes and uses anaerobic and aerobic microbiological treatment.Even if after being diluted with water, can have been eliminated by microbial method and advanced oxidation processes
Organic matter in machine waste water cannot but eliminate wherein salinity.These are by microorganism and Fenton oxidation treated waste water, if not
Rivers are discharged into through desalting processing, water body salt content is will cause and increases and influence water quality；It is such as used for field irrigation, will cause farmland salt
Alkalization.If these non-desalting waste water are recycled, it will cause salinity and stockpile, influence water quality, influence product quality.
Summary of the invention
The technical problem to be solved by the present invention is to overcome above-mentioned the deficiencies in the prior art, provides one and reverse osmosis membrane is installed
The alkaline defibrination wastewater treatment and circulation utilization method of device, the i.e. " fermentation-reverse osmosis treatment-alkalization-of high concentrated organic wastewater
The processing of lime regeneration " and alkali collection utilize method.This method obtains fresh water using the method for reverse osmosis membrane concentration, then by fresh water
Defibrination and pulp washing water are made in reuse, can reduce the amount for carrying inorganic sodium in paper pulp secretly, while improving alkali recovery.This method can
It recycles sodium hydroxide from alkaline defibrination waste water, realize the regeneration of sodium hydroxide and lime and recycles and waste water follows
Ring utilizes.
The scheme that the present invention solves above-mentioned technical problem is as follows:
A kind of alkaline defibrination wastewater treatment being equipped with reverse osmosis membrane apparatus and circulation utilization method, comprising the following steps:
S1. the fermentation process of alkaline defibrination waste water: alkaline defibrination waste water enters fermentor and carries out fermentation process, fermentation time
It is 5~15 days；By fermentation, makes a part of organic matter degradation in waste water and be converted into biogas and carbon dioxide, another part
Organic matter polymeric precipitation, becomes fermented sludge；Meanwhile the organic acid sodium in waste water being made to be converted into sodium bicarbonate；Disappear to reach
Except the purpose of the organic matter in waste water.
S2. it the reverse osmosis membrane concentration of clear liquid: is cut by the clear liquid that fermentation process obtains by dissolved air flotation and ultrafiltration
After staying, is filtered using two steps ro film, obtain fresh water (desalted water) and concentrate.
S3. the basification of concentrate: quick lime is added in the concentrate obtained to step S2 and carries out basification, sufficiently
First with water digestion reaction occurs for stirring, quick lime, generates calcium hydroxide, and calcium hydroxide does not drop with the sodium bicarbonate in concentrate and on a small quantity
Lignin sodium, sodium resinate and the reaction of Carboxylic Acid Fibre element sodium of solution, generate calcium carbonate, lignin calcium, calcium resinate and Carboxylic Acid Fibre element
The mixed sediments such as calcium after standing, isolate supernatant, obtain alkaline solution；Alkaline solution is used as immersion or boiling fibrous raw material
With the supplement of water and sodium hydroxide.To realize the regeneration of sodium hydroxide and recycle.
S4. the fresh water direct reuse that step S2 is obtained fresh water direct reuse: is made into defibrination and pulp washing water.First pass through reverse osmosis
It is obtained after permeable membrane filtration treatment fresh water (desalted water), then defibrination and pulp washing water is made into fresh water reuse, it is excessive to reduce paper pulp entrainment
Inorganic sodium, while improving alkali recovery, realize recycling for waste water.
S5. quick lime regenerates: the mixed sediment that step S3 is generated is sent into limekiln calcining after dryer is handled, then
Raw quick lime, while discharging water outlet and carbon dioxide；Regenerated quick lime is used for quick lime used in step S3 basification, from
And it realizes the regeneration of quick lime and recycles.
Preferably, pH=7.3~7.6 of the clear liquid in the step S2.
Preferably, the mass ratio of concentrate and quick lime is 23~32:1 in the step S3.
Preferably, the temperature of the step S5 calcining is 900 degrees Celsius.
Technical principle of the invention is as follows:
(1) principle of fermentative degradation organic matter:
The osmotic pressure of aqueous solution can influence the growth and breeding of microorganism strongly.Different types of microorganism has different
Adaptability, growth from solution and breeding of most microorganisms usually in salt quality concentration for 0.5~3.0%.According to grinding for forefathers
Study carefully the result shows that, can inhibit the growth and breeding of microorganism in 5~10% solution of salt quality concentration.It is 0.85 in mass concentration
In~0.9% NaCl aqueous solution, the osmotic pressure of salt water is equal to the osmotic pressure of the cell of microbial body, is microorganism growth
With the optium concentration of breeding.Therefore, after fermentation, it can be recycled repeatedly by the clear liquid being obtained by filtration, deposit salt content therein
Product, when concentration reaches 0.9~1.0%, the effect of fermentation is best.During the fermentation, along with a large amount of microbial reproduction and
Growth, a large amount of organic matters are swallowed by these microorganisms, meanwhile, microbial body can generate and be discharged a large amount of enzyme, accelerate organic
The degradation of matter, is converted into biogas and CO2；To realize the degradation of organic matter.In the conversion process, organic acid sodium and others
Organosiloxane compound is converted into sodium bicarbonate, carbon dioxide, water and biogas.
(2) principle of reverse osmosis membrane concentration:
Osmosis filtration, which refers to, overcomes osmotic pressure using external pressure, so that water forms fresh water by semipermeable membrane, and cuts
Stay the process of the substance (such as salt ion, organic matter) of particle or even any low molar mass.Applied in osmosis filtration
Semipermeable membrane is commonly referred to as reverse osmosis membrane, it is a kind of special pore-free material (or aperture very little)；Reverse osmosis membrane has very
Good hydrophily, water energy freely diffuse into out the macromolecular structure of membrane body.In solution diffusion mechanism, water is dissolved in film,
And by membrane diffusion, the fresh water for becoming reverse osmosis membrane filtration is concentrated；And solute (including single charged ion, such as Na dissolved+,
Cl-) cannot be trapped in concentrate by membrane diffusion, obtain reverse osmosis membrane concentrate.The alkaline defibrination that the present invention is handled
Waste water in the clear liquid obtained by fermentation process, mainly contains Na+、Cl-And HCO3 -Ion, and it is a small amount of unconverted organic
Sodium compound, these electrolyte will be trapped in concentrate.
(3) basified principle is concentrated:
Contain sodium bicarbonate, and a small amount of still undegradable lignin sodium, sodium resinate and Carboxylic Acid Fibre element sodium in concentrate
Equal substances.Sodium bicarbonate, lignin sodium, sodium resinate and Carboxylic Acid Fibre element sodium can be reacted with calcium hydroxide, respectively generate calcium carbonate,
Lignin calcium, calcium resinate and calcium carboxylates cellulose calcium, while producing sodium hydroxide.Three kinds of substances next are reacted with calcium hydroxide all to be belonged to
In balanced reaction, when naoh concentration is lower, reacts to precipitating and generate direction progress, once naoh concentration is increased to
When to a certain degree, reacts and carried out to precipitating dissolution direction；Adapt to the alkali collection with low concentration.Chemical reaction indicates are as follows:
NaHCO3+Ca(OH)2→CaCO3↓+NaOH+H2O (1)
Lignin-Na2+Ca(OH)2→ lignin-Ca ↓+2NaOH (2)
2 resin acid group-Na+Ca (OH)2→ resin acid group2-Ca↓+2NaOH (3)
Carboxylate radical cellulose-Na+Ca (OH)2→ carboxylate radical cellulose2-Ca↓+2NaOH (4)
(4) lime regeneration principle
In the solid matter that quaternization generates, contain the objects such as calcium carbonate, lignin calcium, calcium resinate and Carboxylic Acid Fibre element calcium
Matter, these hybrid solid substances are converted into lime water and carbon dioxide after limekiln is calcined.Chemical reaction indicates are as follows:
CaCO3→CaO+CO2↑ (5)
Lignin-Ca → CaO+H2O+CO2↑ (6)
Resin acid group2-Ca→CaO+H2O+CO2↑ (7)
Carboxylate radical cellulose2-Ca→CaO+H2O+CO2↑ (8)
The invention has the following advantages:
(1) sodium hydroxide can be recycled from alkaline defibrination waste water, realize the regeneration and circulation benefit of sodium hydroxide and lime
With the cost burden of reduction purchase sodium hydroxide and quick lime.Regenerated sodium hydroxide accounts for used in immersion or boiling fibrous raw material
Sodium hydroxide total amount up to 36.5~41.4%, regenerated quick lime account for quick lime total amount used in basification up to 88.0~
90.0%.
(2) fresh water is obtained using the method for reverse osmosis membrane concentration, then defibrination and pulp washing water is made into fresh water reuse, can reduced
It carries the amount of inorganic sodium in paper pulp secretly, while improving alkali recovery.
(3) it can be realized recycling for waste water, reduce discharge of wastewater and cause environmental pollution.The technology effectively solves
The green of certainly alkaline defibrination waste water converts and recycles problem.
Detailed description of the invention
Fig. 1 is the technique of alkaline the defibrination wastewater treatment and circulation utilization method for being equipped with reverse osmosis membrane apparatus of the invention
Flow chart.
Specific embodiment
Below with reference to specific embodiment, the present invention is further described, but does not limit the scope of the invention and apply
Range.
Embodiment 1
100 kilograms of sodium hydroxides are dissolved in 10000 kg of water, for impregnating the obtained softening wood chip of 1000 kilograms of wood chips
2600 kilograms, wherein (8400 kilograms of the low concentration thin phenol water in addition generated, solid content 4.0wt%) 1800 kilograms aqueous.
The cork sheet obtains 2400 kilograms of the paper pulp and alkalescent of water content 70% after adding water defibrination and squeezing water squeezing processing
12000 kilograms of defibrination waste water；COD value 4716mg/L, solid content 1.8wt%, pH=8.9.
As shown in Figure 1, handling above-mentioned alkalescent defibrination waste water, specific step is as follows:
(1) fermentation process of alkaline defibrination waste water: defibrination waste water enters fermentor and carries out fermentation process, fermentation time 5
It.By fermentation, makes a part of organic matter degradation in waste water and be converted into biogas and carbon dioxide；Another part organic matter is poly-
Precipitating is closed, fermented sludge is become；Meanwhile the organic acid sodium in waste water being made to be converted into sodium bicarbonate.After fermentation process, obtain
12000 kilograms of clear liquid, COD value drop to 628mg/L, solid content 0.7wt%, pH=7.6.
(2) the reverse osmosis membrane concentration of clear liquid: the 12000 kilograms of clear liquids obtained by fermentation process are by dissolved air flotation
After ultrafiltration retention, filtered using two steps ro film, obtain 1920 kilograms of fresh water (desalted water) 10080 and concentrate (Gu
Shape object content 4.38wt%).
(3) basification of concentrate: into 1920 kilograms of concentrates that step (2) obtains be added 60 kilograms of quick limes into
Row basification, is sufficiently stirred, and quick lime is first to occur digestion reaction with water, generates calcium hydroxide, calcium hydroxide is with sodium bicarbonate and less
Undegradable lignin sodium, sodium resinate and the reaction of Carboxylic Acid Fibre element sodium are measured, calcium carbonate, lignin calcium, calcium resinate and carboxylic acid are generated
The mixed sediments such as cellulose calcium after standing, are filtered, obtain 1800 kilograms alkaline solution and 180 kilograms aqueous 60% mixed
Close solid.Resulting alkaline solution contains sodium hydroxide 2.3wt%, 41.4 kilograms of regeneration sodium hydroxide, accounts for and impregnates hydrogen used in wood chip
The 41.4% of sodium oxide molybdena total amount improves alkali recovery.COD value drops to 148mg/L, solid content 0.3wt%；The lye quilt
It is transferred to fermentation vat, reuse is made to impregnate the supplement of wood chip lye.
(4) fresh water direct reuse: 10080 kilograms of fresh water direct reuses that step (2) is obtained make defibrination and pulp washing water,
Carry excessive inorganic sodium secretly to avoid paper pulp.
(5) quick lime regenerates: 180 kilograms aqueous 60% of the hybrid solid that step (3) obtains is sent after dryer is handled
Enter limekiln and be calcined to 900 degrees Celsius, 52.8 kilograms of quick lime of regeneration is obtained after cooling, accounts for quick lime total amount used in basification
The 88.0% of (60 kilograms), while discharging water outlet and carbon dioxide；Regenerated quick lime is for used in step (3) basification
Quick lime, thus realize recycling for quick lime.
Embodiment 2
100 kilograms of sodium hydroxides are dissolved in 10000 kg of water, for impregnating the obtained softening sugarcane of 1000 kilograms of bagasse
3200 kilograms of slag, wherein 2500 kilograms aqueous (about 7800 kilograms of the low concentration thin phenol water in addition generated, solid content
3.8wt%).For the softening bagasse after adding water defibrination and squeezing water squeezing processing, the paper pulp 2300 for obtaining water content 70% is public
10000 kilograms of jin and alkalescent defibrination waste water；COD value 6570mg/L, solid content 1.7wt%, pH=8.6.
As shown in Figure 1, handling above-mentioned alkalescent defibrination waste water, specific step is as follows:
(1) fermentation process of alkaline defibrination waste water: defibrination waste water enters fermentor and carries out fermentation process, fermentation time 15
It.By fermentation, makes a part of organic matter degradation in waste water and be converted into biogas and carbon dioxide；Another part organic matter is poly-
Precipitating is closed, fermented sludge is become；Meanwhile the organic acid sodium in waste water being made to be converted into sodium bicarbonate.After fermentation process, 9800 are obtained
Kilogram clear liquid, COD value drops to 772mg/L, solid content 0.8wt%, pH=7.5.
(2) the reverse osmosis membrane concentration of clear liquid: the 9800 kilograms of clear liquids obtained by fermentation process are by dissolved air flotation
After ultrafiltration retention, is filtered using two steps ro film, obtain 1568 kilograms of (solids of fresh water (desalted water) 8232 and concentrate
Object content 5.0wt%).
(3) basification of concentrate: into 1568 kilograms of concentrates that step (2) obtains be added 60 kilograms of quick limes into
Row basification, is sufficiently stirred, and quick lime is first to occur digestion reaction with water, generates calcium hydroxide, calcium hydroxide is with sodium bicarbonate and less
Undegradable lignin sodium, sodium resinate and the reaction of Carboxylic Acid Fibre element sodium are measured, calcium carbonate, lignin calcium, calcium resinate and carboxylic acid are generated
The mixed sediments such as cellulose calcium after standing, are filtered, obtain 1450 kilograms alkaline solution and 178 kilograms aqueous 60% mixed
Close solid.Resulting alkaline solution contains sodium hydroxide 2.8wt%, 40.6 kilograms of regeneration sodium hydroxide, accounts for and impregnates used in bagasse
The 40.6% of sodium hydroxide total amount improves alkali recovery.COD value drops to 186mg/L, solid content 0.31wt%；The alkali
Liquid is transferred to fermentation vat, and reuse is made to impregnate the supplement of bagasse lye.
(4) fresh water direct reuse: 8232 kilograms of fresh water direct reuses that step (2) is obtained make defibrination and pulp washing water,
Carry excessive inorganic sodium secretly to avoid paper pulp.
(5) quick lime regenerates: 178 kilograms aqueous 60% of the hybrid solid that step (3) obtains is sent after dryer is handled
Enter limekiln and be calcined to 900 degrees Celsius, 54 kilograms of quick lime of regeneration is obtained after cooling, accounts for quick lime total amount used in basification
The 90.0% of (60 kilograms), while discharging water outlet and carbon dioxide；Regenerated quick lime is for used in step (3) basification
Quick lime, thus realize that quick lime recycles.
Embodiment 3
100 kilograms of sodium hydroxides are dissolved in 6000 kg of water, are used for the obtained softening wood chip of 1000 kilograms of wood chips of boiling
3000 kilograms, wherein (about 2800 kilograms of the low concentration thin phenol water in addition generated, solid content 5wt%) 2250 kilograms aqueous.
The softening wood chip obtains 2000 kilograms of the paper pulp and weak base of water content 70% after adding water defibrination and squeezing water squeezing processing
9000 kilograms of waste water of defibrination of property；COD value 7570mg/L, solid content 2.3wt%, pH=8.8.
As shown in Figure 1, handling above-mentioned alkalescent defibrination waste water, specific step is as follows:
(1) fermentation process of alkaline defibrination waste water: defibrination waste water enters fermentor and carries out fermentation process, fermentation time 10
It.By fermentation, makes a part of organic matter degradation in waste water and be converted into biogas and carbon dioxide；Another part organic matter is poly-
Precipitating is closed, fermented sludge is become；Meanwhile the organic acid sodium in waste water being made to be converted into sodium bicarbonate.After fermentation process, 8800 are obtained
Kilogram clear liquid, COD value drops to 508mg/L, solid content 0.9wt%, pH=7.3.
(2) the reverse osmosis membrane concentration of clear liquid: the 8800 kilograms of clear liquids obtained by fermentation process are by dissolved air flotation
After ultrafiltration retention, is filtered using two steps ro film, obtain 1408 kilograms of (solids of fresh water (desalted water) 7392 and concentrate
Object content 5.63wt%).
(3) basification of concentrate: into 1408 kilograms of concentrates that step (2) obtains be added 60 kilograms of quick limes into
Row basification, is sufficiently stirred, and quick lime is first to occur digestion reaction with water, generates calcium hydroxide, calcium hydroxide is with sodium bicarbonate and less
Undegradable lignin sodium, sodium resinate and the reaction of Carboxylic Acid Fibre element sodium are measured, calcium carbonate, lignin calcium, calcium resinate and carboxylic acid are generated
The mixed sediments such as cellulose calcium after standing, are filtered, obtain 1283 kilograms alkaline solution and 185 kilograms aqueous 60% mixed
Close solid.Resulting alkaline solution contains sodium hydroxide 2.8wt%, 36.5 kilograms of regeneration sodium hydroxide, accounts for hydrogen used in boiling wood chip
The 36.5% of sodium oxide molybdena total amount improves alkali recovery.COD value drops to 271mg/L, solid content 0.42wt%；The lye
It is transferred to fermentation vat, the supplement of boiling wood chip lye is made in reuse.
(4) fresh water direct reuse: 7392 kilograms of fresh water direct reuses that step (2) is obtained make defibrination and pulp washing water,
Carry excessive inorganic sodium secretly to avoid paper pulp.
(5) quick lime regenerates: 185 kilograms aqueous 60% of the hybrid solid that step (3) obtains is sent after dryer is handled
Enter limekiln and be calcined to 900 degrees Celsius, 53 kilograms of quick lime of regeneration is obtained after cooling, accounts for quick lime total amount used in basification
The 88.3% of (60 kilograms), while discharging water outlet and carbon dioxide；Regenerated quick lime is for used in step (3) basification
Quick lime, thus realize that quick lime recycles.
Application effect of the invention:
The present invention completes pilot scale in Guangxi University, and application effect is good, can recycle from alkalescent defibrination waste water
Sodium hydroxide, meanwhile, the lime of process application can regenerate in system, and realize and recycle.Importantly, installation
After counter-infiltration system, reduce the amount of the sodium salt of paper pulp entrainment, while improving alkali recovery.This method can reach pulping process
Wastewater zero discharge, wastewater treatment method of the operating cost lower than common " anaerobic-aerobic-advanced oxidation processing ".
Claims (4)
1. a kind of alkaline defibrination wastewater treatment for being equipped with reverse osmosis membrane apparatus and circulation utilization method, which is characterized in that including
Following steps:
S1. the fermentation process of alkaline defibrination waste water: alkaline defibrination waste water enters fermentor and carries out fermentation process, fermentation time 5
~15 days；
S2. the reverse osmosis membrane concentration of clear liquid: by the clear liquid that fermentation process obtains after dissolved air flotation and ultrafiltration retention,
It is filtered using two steps ro film, obtains fresh water and concentrate；
S3. the basification of concentrate: quick lime is added in the concentrate obtained to step S2 and carries out basification, sufficiently stirs
It mixes, generation mixed sediment, after standing, isolates supernatant, obtain alkaline solution；Alkaline solution is used as immersion or boiling fiber is former
The material supplement of water and sodium hydroxide；
S4. the fresh water direct reuse that step S2 is obtained fresh water direct reuse: is made into defibrination and pulp washing water；
S5. quick lime regenerates: the mixed sediment that step S3 is generated is sent into limekiln calcining, regeneration life after dryer is handled
Lime, while discharging water outlet and carbon dioxide；Regenerated quick lime is for quick lime used in step S3 basification.
2. the method according to claim 1, wherein pH=7.3~7.6 of the clear liquid in the step S2.
3. the method according to claim 1, wherein the mass ratio of concentrate and quick lime is in the step S3
23~32:1.
4. the method according to claim 1, wherein the temperature of step S5 calcining is 900 degrees Celsius.
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| CN201811161578.XA CN109095729A (en) | 2018-09-30 | 2018-09-30 | The alkaline defibrination wastewater treatment and circulation utilization method of reverse osmosis membrane apparatus are installed |
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| CN201811161578.XA CN109095729A (en) | 2018-09-30 | 2018-09-30 | The alkaline defibrination wastewater treatment and circulation utilization method of reverse osmosis membrane apparatus are installed |
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| CN201811161578.XA Pending CN109095729A (en) | 2018-09-30 | 2018-09-30 | The alkaline defibrination wastewater treatment and circulation utilization method of reverse osmosis membrane apparatus are installed |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077179A (en) * | 1992-04-11 | 1993-10-13 | 山东省环境保护科学研究所 | Alkaline straw pulp paper black liquid and sewage treatment technology of intermediate section |
| CN1279212A (en) * | 2000-01-18 | 2001-01-10 | 罗英铭 | Process and equipment for treating sewage with lime |
| CN1316567A (en) * | 2000-04-05 | 2001-10-10 | 李风宁 | Process for treating black digestion liquid generated by paper alkali pulping |
| CN103757965A (en) * | 2014-01-15 | 2014-04-30 | 新疆国力源投资有限公司 | Biological alkali recovery process for papermaking black liquor |
| CN104674590A (en) * | 2013-12-03 | 2015-06-03 | 新世膜科技股份有限公司 | Treatment method and treatment equipment for papermaking black liquid |
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2018
- 2018-09-30 CN CN201811161578.XA patent/CN109095729A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1077179A (en) * | 1992-04-11 | 1993-10-13 | 山东省环境保护科学研究所 | Alkaline straw pulp paper black liquid and sewage treatment technology of intermediate section |
| CN1279212A (en) * | 2000-01-18 | 2001-01-10 | 罗英铭 | Process and equipment for treating sewage with lime |
| CN1316567A (en) * | 2000-04-05 | 2001-10-10 | 李风宁 | Process for treating black digestion liquid generated by paper alkali pulping |
| CN104674590A (en) * | 2013-12-03 | 2015-06-03 | 新世膜科技股份有限公司 | Treatment method and treatment equipment for papermaking black liquid |
| CN103757965A (en) * | 2014-01-15 | 2014-04-30 | 新疆国力源投资有限公司 | Biological alkali recovery process for papermaking black liquor |
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Application publication date: 20181228 |